jobd/gc.sh

   1 #!/bin/sh
   2
   3 # NOTE: additional options can be passed to git repack by specifying
   4 #       them after the project name, for example:
   5 #         gc.sh my-project -f
   6
   7 . @basedir@/shlib.sh
   8
   9 set -e
  10
  11 if [ $# -lt 1 ]; then
  12         echo "Usage: gc.sh projname [extra-repack-args]" >&2
  13         exit 1
  14 fi
  15
  16 # Includes
  17 _shlib_done=1
  18 unset GIROCCO_SUPPRESS_AUTO_GC_UPDATE
  19 . "$cfg_basedir/jobd/maintain-auto-gc-hack.sh"
  20 . "$cfg_basedir/jobd/generate-auto-gc-update.sh"
  21 GIROCCO_SUPPRESS_AUTO_GC_UPDATE=1 && export GIROCCO_SUPPRESS_AUTO_GC_UPDATE
  22
  23 # packing options
  24 packopts="--depth=50 --window=50 --window-memory=${var_window_memory:-1g}"
  25 quiet=; [ -n "$show_progress" ] || quiet=-q
  26
  27 umask 002
  28 [ "$cfg_permission_control" != "Hooks" ] || umask 000
  29 clean_git_env
  30
  31 pidactive() {
  32         if _result="$(kill -0 "$1" 2>&1)"; then
  33                 # process exists and we have permission to signal it
  34                 return 0
  35         fi
  36         case "$_result" in *"not permitted"*)
  37                 # we do not have permission to signal the process
  38                 return 0
  39         esac
  40         # process does not exist
  41         return 1
  42 }
  43
  44 createlock() {
  45         # A .lock file should only exist for much less than a second.
  46         # If we see a stale lock file (> 1h old), remove it and then,
  47         # just in case, wait 30 seconds for any process whose .lock
  48         # we might have just removed (it's racy) to finish doing what
  49         # should take much less than a second to do.
  50         _stalelock="$(find -L "$1.lock" -maxdepth 1 -mmin +60 -print 2>/dev/null)" || :
  51         if [ -n "$_stalelock" ]; then
  52                 rm -f "$_stalelock"
  53                 sleep 30
  54         fi
  55         for _try in p p n; do
  56                 if (set -C; >"$1.lock") 2>/dev/null; then
  57                         echo "$1.lock"
  58                         return 0
  59                 fi
  60                 # delay and try again
  61                 [ "$_try" != "p" ] || sleep 1
  62         done
  63         # cannot create lock file
  64         return 1
  65 }
  66
  67 # The pre-receive script creates one ref log file per push but we want them to
  68 # be coalesced into one ref log file per day.  We are guaranteed that any files
  69 # we find to coalesce are NOT currently being written to since they are always
  70 # written first as temporary files and then moved into place.  We attempt to
  71 # transfer the most recent modification time to the coalesced log file which
  72 # would step on its mod time if it were being written to directly, but if we
  73 # find per-process ref log files then it must be a push project and the only
  74 # thing that would write directly to the main per-day log file would be a
  75 # mirror project so there's actually no conflict.
  76 # Also, if the clock is wonky (or was futzed with) we may have both YYYYMMDD
  77 # and YYYYMMDD.gz present in which case combine them into YYYYMMDD
  78 coalesce_reflogs() {
  79         [ -d reflogs ] || return 0
  80         rm -f .gc_failed
  81         find -L reflogs -maxdepth 1 -type f -name "[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]" -print |
  82         while read -r rname; do
  83                 if [ -e "$rname.gz" ]; then
  84                         if [ -s "$rname" ]; then
  85                                 # Presumably the .gz file must have been created before the non-gz
  86                                 # file since it had to be uncompressed at some point therefore
  87                                 # we need to append the non-gz contents to it but keep the non-gz
  88                                 # contents timestamp so we rename to YYYYMMDD_ which will sort first
  89                                 # and be picked up in the next step if we are interrupted in the middle.
  90                                 # If a YYYYMMDD_ file already exists we append to it and transfer the
  91                                 # timestamp.  Finally we transfer the YYYYMMDD_ timestamp to the result
  92                                 # and remove the YYYYMMDD_ temporary file leaving the result uncompressed.
  93                                 if [ -e "${rname}_" ]; then
  94                                         cat "$rname" >>"${rname}_"
  95                                         touch -r "$rname" "${rname}_"
  96                                         rm -f "$rname"
  97                                         ! [ -e "$rname" ]
  98                                 else
  99                                         mv "$rname" "${rname}_"
 100                                 fi
 101                                 gzip -d "$rname.gz" </dev/null
 102                                 [ -e "$rname" ] && ! [ -e "$rname.gz" ]
 103                                 cat "${rname}_" >>"$rname"
 104                                 touch -r "${rname}_" "$rname"
 105                                 rm -f "${rname}_"
 106                         else
 107                                 # Just remove the empty file to resolve the problem
 108                                 rm -f "$rname"
 109                         fi
 110                 fi
 111         done
 112         find -L reflogs -maxdepth 1 -type f -name "[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]_*" -print | LC_ALL=C sort |
 113         while read -r rname; do
 114                 logname="${rname%%_*}"
 115                 # If someone's been futzing with the date, the file we want to
 116                 # append to could already have been compressed, so we just uncompress
 117                 # it here.  The previous block guarantees we do not have both a compressed
 118                 # and uncompressed version present at the same time.
 119                 if [ -e "$logname.gz" ]; then
 120                         gzip -d "$logname.gz" </dev/null
 121                         [ -e "$logname" ] && ! [ -e "$logname.gz" ]
 122                 fi
 123                 cat "$rname" >>"$logname"
 124                 touch -r "$rname" "$logname"
 125                 rm -f "$rname"
 126                 if [ -e "$rname" ]; then
 127                         >.gc_failed
 128                         echo "! [$proj] failed to remove $rname" >&2
 129                         exit 1 # will only exit subshell created by "|"
 130                 fi
 131         done
 132         ! [ -e .gc_failed ]
 133 }
 134
 135 # Remove any files in reflogs that are older than $cfg_reflogs_lifetime days
 136 prune_reflogs() {
 137         [ -d reflogs ] || return 0
 138         exp="$(( ${cfg_reflogs_lifetime:-1} * 1440 ))"
 139         [ $exp -gt 0 ] || exp=1440
 140         [ $exp -le 43200 ] || exp=43200
 141         find -L reflogs -maxdepth 1 -type f -mmin "+$exp" -exec rm -f '{}' + || :
 142 }
 143
 144 # Compact any reflogs that are not today's UTC date unless a .gz version exists
 145 compact_reflogs() {
 146         [ -d reflogs ] || return 0
 147         _td="reflogs/$(TZ=UTC date '+%Y%m%d')"
 148         find -L reflogs -maxdepth 1 -type f -name "[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]" -print |
 149         while read -r rname; do
 150                 [ "$rname" != "$_td" ] || continue
 151                 ! [ -e "$rname.gz" ] || continue
 152                 gzip -9 "$rname" </dev/null
 153         done
 154 }
 155
 156 # return true if there's more than one objects/pack-<sha>.pack file or
 157 # ANY sha-1 files in objects
 158 is_dirty() {
 159         _packs=$(find -L objects/pack -type f -name "pack-$octet20*.pack" -print | head -n 2 | LC_ALL=C wc -l)
 160         if [ $_packs != 1 ] && [ $_packs != 0 ]; then
 161                 return 0
 162         fi
 163         _objs=$(find -L objects/$octet -type f -name "$octet19*" -print 2>/dev/null | head -n 1 | LC_ALL=C wc -l)
 164         [ $_objs -ne 0 ]
 165 }
 166
 167 # make sure combine-packs uses the correct Git executable
 168 run_combine_packs() {
 169         PATH="$var_git_exec_path:$cfg_basedir/bin:$PATH" @basedir@/jobd/combine-packs.sh "$@"
 170 }
 171
 172 # combine the input pack(s) into a new pack (or possibly packs if packSizeLimit set)
 173 # input pack names are read from standard input one per line delimited by the first
 174 # ':', ' ' or '\n' character on the line (which allows gfi-packs to be read directly)
 175 # all arguments, if any, are passed to pack-objects as additional options
 176 # returns non-zero on failure AND creates .gc_failed in that case
 177 combine_packs() {
 178         rm -f .gc_failed
 179         find -L objects/pack -maxdepth 1 -type f -name '*.zap*' -exec rm -f '{}' + || :
 180         run_combine_packs --replace "$@" $packopts --all-progress-implied $quiet --non-empty || {
 181                 >.gc_failed
 182                 return 1
 183         }
 184         return 0
 185 }
 186
 187 # if the current directory is_gfi_mirror then repack all packs listed in gfi-packs
 188 repack_gfi_packs() {
 189         [ -n "$gfi_mirror" ] || return 0
 190         [ -d objects/pack ] || { rm -f gfi-packs; return 0; }
 191         progress "~ [$proj] redeltifying poor quality git fast-import packs"
 192         combine_packs --ignore-missing --no-reuse-delta <gfi-packs
 193         rm -f gfi-packs
 194         return 0
 195 }
 196
 197 # combine small packs into larger pack(s)
 198 # we avoid any keep, bndl or bitmap packs
 199 # if the optional argument is non-empty even a single small pack will be redeltad
 200 combine_small_packs() {
 201         _didprogress=
 202         _minsmallpacks=2
 203         if [ -n "$1" ] && [ -n "$noreusedeltaopt" ]; then
 204                 _minsmallpacks=1
 205         fi
 206         _lpo="--exclude-no-idx --exclude-keep --exclude-bitmap --exclude-bndl"
 207         _lpo="$_lpo --exclude-sfx _u --exclude-sfx _o"
 208         _lpo="$_lpo --quiet --object-limit $var_redelta_threshold objects/pack"
 209         while
 210                 _cnt="$(list_packs --count $_lpo)" || :
 211                 test "${_cnt:-0}" -ge $_minsmallpacks
 212         do
 213                 [ -n "$_didprogress" ] || {
 214                         progress "~ [$proj] combining small packs into a single larger pack"
 215                         _didprogress=1
 216                 }
 217                 _newp="$(list_packs $_lpo | combine_packs --names $noreusedeltaopt)"
 218                 _newc="$(( $(echo "$_newp" | LC_ALL=C wc -w) ))"
 219                 # be paranoid and exit the loop if we haven't reduced the number of packs
 220                 [ $_newc -lt $_cnt ] || break
 221                 _minsmallpacks=2
 222         done
 223         return 0
 224 }
 225
 226 # Unfortunately git-svn lacks the ability to store newly fetched revisions as a pack.
 227 # However, the fetch code conveniently sets .svnpack just before it runs git-svn fetch
 228 # so that it's easy to find all the objects that have been fetched by git-svn and
 229 # combine them into a pack.  The --no-reuse-delta option is meaningless here since
 230 # everything to be packed is a loose object and therefore not a delta so deltification
 231 # will always take place.
 232 make_svn_pack() {
 233         [ -f .svnpack ] && [ -n "$svn_mirror" ] || return 0
 234         rm -f .svnpackgc
 235         mv -f .svnpack .svnpackgc
 236         progress "~ [$proj] combining loose git-svn objects into a pack"
 237         _newp="$(find -L objects/$octet -maxdepth 1 -type f -newer .svnpackgc -name "$octet19*" -print 2>/dev/null |
 238         LC_ALL=C awk -F / '{print $2 $3}' |
 239         run_combine_packs --objects --names $packopts --incremental --all-progress-implied $quiet --non-empty)" || {
 240                 mv -f .svnpackgc .svnpack
 241                 >.gc_failed
 242                 return 1
 243         }
 244         if [ -n "$_newp" ]; then
 245                 # remove the now-redundant loose objects -- this is always safe
 246                 # even during a concurrent push because a reprepare_packed_git
 247                 # will be triggered if an object that should be there is not
 248                 # found thereby finding it in the new pack instead
 249                 git prune-packed $quiet
 250         fi
 251         rm -f .svnpackgc
 252 }
 253
 254 # HEADSHA="$(pack_is_complete /full/path/to/some.pack /full/path/to/packed-refs "$(cat HEAD)")"
 255 pack_is_complete() {
 256         # Must have a matching .idx file and a non-empty packed-refs file
 257         [ -s "${1%.pack}.idx" ] || return 1
 258         [ -s "$2" ] || return 1
 259         _headsha=
 260         case "$3" in
 261                 $octet20*)
 262                         _headsha="$3"
 263                         ;;
 264                 "ref: refs/"?*|"ref:refs/"?*|"refs/"?*)
 265                         _headmatch="${3#ref:}"
 266                         _headmatch="${_headmatch# }"
 267                         _headmatchpat="$(echo "$_headmatch" | LC_ALL=C sed -e 's/\([.$]\)/\\\1/g')"
 268                         _headsha="$(LC_ALL=C grep -e "^$octet20$hexdig* $_headmatchpat\$" <"$2" |
 269                                     LC_ALL=C cut -d ' ' -f 1)"
 270                         case "$_headsha" in $octet20*) :;; *)
 271                                 return 1
 272                         esac
 273                         ;;
 274                 *)
 275                         # bad HEAD
 276                         return 1
 277         esac
 278         rm -rf pack_is_complete_test
 279         mkdir pack_is_complete_test
 280         mkdir pack_is_complete_test/refs
 281         mkdir pack_is_complete_test/objects
 282         mkdir pack_is_complete_test/objects/pack
 283         echo "$_headsha" >pack_is_complete_test/HEAD
 284         ln -s "$1" pack_is_complete_test/objects/pack/
 285         ln -s "${1%.pack}.idx" pack_is_complete_test/objects/pack/
 286         ln -s "$2" pack_is_complete_test/packed-refs
 287         _count="$(git --git-dir=pack_is_complete_test rev-list --count --all 2>/dev/null)" || :
 288         rm -rf pack_is_complete_test
 289         [ -n "$_count" ] || return 1
 290         [ "$_count" -gt 0 ] 2>/dev/null || return 1
 291         echo "$_headsha"
 292 }
 293
 294 # On return a "$lockf" will have been created that must be removed when gc is done
 295 lock_gc() {
 296         # be compatibile with gc.pid file from newer Git releases
 297         lockf=gc.pid
 298         hn="$(hostname)"
 299         active=
 300         if [ "$(createlock "$lockf")" ]; then
 301                 # If $lockf is:
 302                 #   1) less than 12 hours old
 303                 #   2) contains two fields (pid hostname) NO trailing NL
 304                 #   3) the hostname is different OR the pid is still alive
 305                 # then we exit as another active process is holding the lock
 306                 if [ "$(find -L "$lockf" -maxdepth 1 -mmin -720 -print 2>/dev/null)" ]; then
 307                         apid=
 308                         ahost=
 309                         read -r apid ahost ajunk <"$lockf" || :
 310                         if [ "$apid" ] && [ "$ahost" ]; then
 311                                 if [ "$ahost" != "$hn" ] || pidactive "$apid"; then
 312                                         active=1
 313                                 fi
 314                         fi
 315                 fi
 316         else
 317                 echo >&2 "[$proj] unable to create gc.pid.lock file"
 318                 exit 1
 319         fi
 320         if [ -n "$active" ]; then
 321                 rm -f "$lockf.lock"
 322                 echo >&2 "[$proj] gc already running on machine '$ahost' pid '$apid'"
 323                 exit 1
 324         fi
 325         printf "%s %s" "$$" "$hn" >"$lockf.lock"
 326         chmod 0664 "$lockf.lock"
 327         mv -f "$lockf.lock" "$lockf"
 328 }
 329
 330 # Create a repack subdirectory such that running repack in it will pack the
 331 # same things that a pack in the normal directory would except that the pack
 332 # is guaranteed to be generated in an optimized order by adding a suitable
 333 # synthesized ref in the refs/tags namespace (yes, pack-objects.c really does
 334 # behave differently depending on the contents of the refs/tags namespace).
 335 # Before calling this, pack-refs --all MUST be performed or the wrong pack
 336 # will end up being made.
 337 #
 338 # If a ref deletion is pushed after making the repack subdir but before the
 339 # the actual repack, the discarded objects will be packed -- no big deal,
 340 # they'll get discarded the next time gc runs.
 341 #
 342 # If a fast-forward ref update is pushed after making the repack subdir but
 343 # before the actual repack, it will be picked up and the new objects packed
 344 # (subject to the normal git repack race about picking such updates up).
 345 #
 346 # If a non-fast-forward ref update is pushed after making the repack subdir but
 347 # before the actual repack, it will be picked up like a fast-forward update but
 348 # the discarded objects will be included like a ref deletion (until the next
 349 # scheduled gc takes place).
 350 #
 351 # We retain a copy of the original packed-refs file as repack/packed-refs.orig
 352 # If ref deletions come in while we're repacking, the original packed-refs
 353 # file will be modified, but we'll still pack the deleted ref(s).
 354 # If the packed-refs.orig file is used to create the bundle header we avoid
 355 # a situation where the bundle contains a ref state that never actually
 356 # existed in reality (for example a new branch is pushed and then an old
 357 # branch deleted afterwards -- the deletion would show up in the bundle
 358 # because it will cause the original packed-refs file to be re-written, but
 359 # the new branch creation will not unless we do another pack-refs which might
 360 # lead to having in incomplete bundle).  Therefore we want to keep a copy of
 361 # the original packed-refs file around.  We do the same thing for HEAD.
 362 #
 363 # It's possible that the "objects" subdirectory is a symbolic link.
 364 # Git does support this.  However, during the repacking process, new packs
 365 # will be created in repack/alt/pack and then moved into objects/pack.
 366 # In order for this to work seemlessly, they must both be on the same
 367 # filesystem.  But when objects (or even objects/pack) is a symbolic link they
 368 # might not be.  For this reason a "repack" subdirectory is created under
 369 # objects/pack and the repack/alt/pack directory symbolicly linked to it.
 370 #
 371 # Git allows not just HEAD to be a symbolic-ref, but any ref anywhere in the
 372 # refs namespace.  We are concerned about ref name collisions and getting the
 373 # right tag set to get an optimal pack.  We can safely duplicate the ref space
 374 # under refs/heads, refs/notes and refs/remotes without any risk of unwanted
 375 # collisions and this will likely make over 99%+ of all symbolic refs found
 376 # in the wild work properly.  Girocco itself never creates any symbolic refs
 377 # inside the refs namespace; this is a nod to simultaneously using a Girocco
 378 # repository for other purposes.
 379 make_repack_dir() {
 380         ! [ -d repack ] || rm -rf repack
 381         ! [ -d repack ] || { echo >&2 "[$proj] cannot remove repack subdirectory"; exit 1; }
 382         [ -d objects/pack ] || mkdir -p objects/pack
 383         ! [ -d objects/pack/repack ] || rm -rf objects/pack/repack
 384         ! [ -d objects/pack/repack ] || { echo >&2 "[$proj] cannot remove objects/pack/repack subdirectory"; exit 1; }
 385         mkdir repack repack/refs repack/alt objects/pack/repack
 386         [ -d info ] || mkdir info
 387         ln -s ../config  repack/config
 388         ln -s ../info    repack/info
 389         ln -s ../objects repack/objects
 390         ln -s "$PWD/objects/pack/repack" repack/alt/pack
 391         ln -s ../../refs repack/refs/refs
 392         _lines=$(( $(LC_ALL=C wc -l <packed-refs) ))
 393         cat HEAD >repack/HEAD.orig
 394         cat packed-refs >repack/packed-refs.orig
 395         if [ $(LC_ALL=C wc -l <repack/packed-refs.orig) -ne "$_lines" ]; then
 396                 echo >&2 "[$proj] error: make_repack_dir failed original packed-refs line count sanity check"
 397                 exit 1
 398         fi
 399         # Note: Git v1.5.0 introduced the "# pack-refs with:" header line for the packed-refs file
 400         sed '/^# pack-refs/d; s, refs/, refs/!/,' <repack/packed-refs.orig >repack/packed-refs
 401         headref="$(git rev-parse --verify --quiet HEAD)" || :
 402         if [ -n "$headref" ]; then
 403                 echo "$headref refs/!=/HEAD" >>repack/packed-refs
 404                 echo "$headref refs/heads/!" >>repack/packed-refs
 405                 _lines=$(( $_lines + 2 ))
 406         fi
 407         if [ $(( $(LC_ALL=C wc -l <repack/packed-refs) + 1 )) -ne "$_lines" ]; then
 408                 echo >&2 "[$proj] error: make_repack_dir failed packed-refs initial line count sanity check"
 409                 exit 1
 410         fi
 411         sed -n '\, refs/heads/,p; \, refs/notes/,p; \, refs/remotes/,p' <repack/packed-refs.orig >>repack/packed-refs
 412         _newlines="$(( $(LC_ALL=C wc -l <repack/packed-refs) ))"
 413         if [ $(( $_newlines + 1 )) -lt "$_lines" ]; then
 414                 echo >&2 "[$proj] error: make_repack_dir failed packed-refs extra line count sanity check"
 415                 exit 1
 416         fi
 417         _lines="$_newlines"
 418         optref="$(git rev-list -n 1 --all 2>/dev/null)" || :
 419         if [ -n "$optref" ]; then
 420                 echo "$optref refs/tags/!" >>repack/packed-refs
 421                 _lines=$(( $_lines + 1 ))
 422                 echo "$optref" >repack/HEAD
 423         else
 424                 cat HEAD >repack/HEAD
 425         fi
 426         if [ $(LC_ALL=C wc -l <repack/packed-refs) -ne "$_lines" ]; then
 427                 echo >&2 "[$proj] error: make_repack_dir failed packed-refs line count sanity check"
 428                 exit 1
 429         fi
 430 }
 431
 432 # Remove any crud that's been left behind by interrupted operations
 433 # that did not clean up after themselves
 434 remove_crud() {
 435         # Remove any existing FETCH_HEAD
 436         # There can only be a FETCH_HEAD if we've been fetching, not if we've been
 437         # receiving pushes (those never create a FETCH_HEAD).
 438         # And if we're fetching because we're a mirror, we know we're not fetching right
 439         # now since jobd.pl never runs a project's fetch simultaneously with its gc.
 440         # Therefore any existing FETCH_HEAD is junk.  And it may be many megabytes if
 441         # there were a lot of refs.
 442         rm -f FETCH_HEAD
 443
 444         # remove any existing pack_is_complete_test or repack subdirectories
 445         # If either exists when this function is called it's crud
 446         rm -rf pack_is_complete_test repack objects/pack/repack
 447
 448         # Remove any stale pack remnants that are more than an hour old.
 449         # Stale pack fragments are defined as any pack-<sha1>.ext where .ext is NOT
 450         # .pack AND the corresponding .pack DOES NOT exist.  A bunch of stale
 451         # pack-<sha1>.idx files without their corresponding .pack files are worthless
 452         # and just waste space.  Normally there shouldn't be any remnants but actually
 453         # this can happen when things are interrupted at just the wrong time.
 454         # Note that the objects/pack directory is created by git init and should
 455         # always exist.
 456         find -L objects/pack -maxdepth 1 -type f -mmin +60 -name "pack-$octet20*.?*" -print |
 457         LC_ALL=C sed -e 's/^objects\/pack\/pack-//; s/\..*$//' | LC_ALL=C sort -u |
 458         while read packsha; do
 459                 ! [ -e "objects/pack/pack-$packsha.pack" ] || continue
 460                 rm -f "objects/pack/pack-$packsha".?*
 461         done
 462
 463         # Remove any stale tmp reflogs files that are more than one hour old.
 464         # Since they are created only while the pre-receive hook is running and
 465         # all it does is process a bunch of refs passed to it on standard input
 466         # it's inconceivable that it would ever take as much as an hour to run.
 467         if [ -d reflogs ]; then
 468                 find -L reflogs -maxdepth 1 -type f -mmin +60 -name "tmp_*" -exec rm -f '{}' + || :
 469         fi
 470
 471         # Remove any stale object tmp_obj_* files that are more than 3 hours old.
 472         # Really these files should only exist very briefly so there shouldn't be any
 473         # but things happen that can end up leaving them behind.
 474         find -L objects/$octet -maxdepth 1 -type f -mmin +180 -name "tmp_obj_?*" -exec rm -f '{}' + 2>/dev/null || :
 475
 476         # Remove any stale pack .keep files that are more than 12 hours old.
 477         # We don't do anything to create any permanent pack .keep files, so they must
 478         # be remnants from some failed push or something.  Removing the .keep will
 479         # allow the pack to be properly repacked.
 480         find -L objects/pack -maxdepth 1 -type f -mmin +720 -name "pack-$octet20*.keep" -exec rm -f '{}' + || :
 481
 482         # Remove any stale tmp_pack_*, tmp_idx_*, tmp_bitmap_*, packtmp-* or .tmp-*-pack* files
 483         # that are more than 12 hours old.
 484         find -L objects/pack -maxdepth 1 -type f -mmin +720 \( \
 485                 -name "tmp_pack_?*" -o -name "tmp_idx_?*" -o -name "tmp_bitmap_?*" -o \
 486                 -name "packtmp-?*" -o -name ".tmp-?*-pack*" \
 487                 \) -exec rm -f '{}' + || :
 488
 489         # Remove any stale incoming-* object quarantine directories that are
 490         # more than 12 hours old.  These are new with Git >= 2.11.0.
 491         find -L objects -maxdepth 1 -type d -name 'incoming-?*' -mmin +720 \
 492                 -exec rm -rf '{}' + || :
 493
 494         # Remove any stale shallow_* files that are more than 12 hours old.
 495         # These can be left behind by Git >= 1.8.4.2 and < 2.0.0 when a client
 496         # requests a shallow clone.  Also discard stale .refs-temp* and
 497         # .refs-new* files at the same time.
 498         find -L . -maxdepth 1 -type f -mmin +720 \( \
 499                 -name "shallow_?*" -o -name ".refs-temp*" -o -name ".refs-new*" \
 500                 \) -exec rm -f '{}' + || :
 501
 502         # Remove any stale *.temp files in the objects area that are more than 12 hours old.
 503         # This can be stale sha1.temp, or stale *.pack.temp so we kill all stale *.temp.
 504         find -L objects -type f -mmin +720 -name "*.temp" -exec rm -f '{}' + || :
 505
 506         # Remove any stale *.lock files in the htmlcache area that might have been left
 507         # behind after an abnormal exit during an attempt to update a cached file and
 508         # are more than 1 hour old.
 509         ! [ -d htmlcache ] || find -L htmlcache -type f -mmin +60 -name "*.lock" -exec rm -f '{}' + || :
 510
 511         # Remove any stale git-svn temp files that are more than 12 hours old.
 512         # The git-svn process creates temp files with random 10 character names
 513         # in the root of $GIT_DIR.  Unfortunately they do not have a recognizable
 514         # prefix, so we just have to kill any files with a 10-character name.  We
 515         # do this only for git-svn mirrors.  All characters are chosen from
 516         # [A-Za-z0-9_] so we can at least check that and fortunately the only
 517         # collision is 'FETCH_HEAD' but that shouldn't matter.
 518         # There may also be temp files with a Git_ prefix as well.
 519         if [ -n "$svn_mirror" ]; then
 520                 _randchar='[A-Za-z0-9_]'
 521                 _randchar2="$_randchar$_randchar"
 522                 _randchar4="$_randchar2$_randchar2"
 523                 _randchar10="$_randchar4$_randchar4$_randchar2"
 524                 find -L . -maxdepth 1 -type f -mmin +720 -name "$_randchar10" -exec rm -f '{}' + || :
 525                 find -L . -maxdepth 1 -type f -mmin +720 -name "Git_*" -exec rm -f '{}' + || :
 526         fi
 527
 528         # Remove any stale fast_import_crash_<pid> files that are more than 3 days old.
 529         if [ -n "$gfi_mirror" ]; then
 530                 find -L . -maxdepth 1 -type f -mmin +4320 -name "fast_import_crash_?*" -exec rm -f '{}' + || :
 531         fi
 532
 533         # Remove any stale core or *.core or core.* files that are more than 3 days old.
 534         find -L . -maxdepth 1 -type f -mmin +4320 \( -name "core" -o -name "*.core" -o -name "core.*" \) \
 535                 -exec rm -f '{}' + || :
 536 }
 537
 538 #
 539 ## Garbage Collection Types
 540 ##
 541 ## There are two kinds of possible garbage collection (gc) operations:
 542 ##
 543 ## 1.  A normal, full gc
 544 ## 2.  A "mini" gc
 545 ##
 546 ## If the full garbage collection interval has expired (or gc has never been
 547 ## run), then a normal, full gc will take place.  Otherwise, a "mini" gc will
 548 ## take place if the file .needsgc exists.
 549 ##
 550 ## A "mini" gc is similar to "git gc --auto" in that it may not end up actually
 551 ## doing anything unless the right conditions are present so it's not a burden
 552 ## to run it often.  If the file .needsgc exists, a "mini" gc will occur at
 553 ## the next opportunity.
 554 ##
 555 ## Note, however, that the .nogc file suppresses ALL gc activity (normal or mini).
 556 #
 557
 558 proj="${1%.git}"
 559 shift
 560 cd "$cfg_reporoot/$proj.git"
 561 [ -d objects/pack ] || { rm -f gfi-packs; mkdir -p objects/pack; }
 562 mirror_url="$(get_mirror_url)" || :
 563 svn_mirror=
 564 ! is_svn_mirror_url "$mirror_url" || svn_mirror=1
 565 gfi_mirror=
 566 if [ -f gfi-packs ] && [ -s gfi-packs ] && is_gfi_mirror_url "$mirror_url"; then
 567         gfi_mirror=1
 568 fi
 569
 570 # If git config --bool --get girocco.redelta is explicitly false then automatic
 571 # redelta when there are less than $var_redelta_threshold objects will be suppressed.
 572 # On the other hand, if git config --get girocco.redelta is "always" then, on a full
 573 # gc only, for the final repack, deltas will always be recomputed.
 574 # This can be set on a per-project basis to avoid unusual pathological gc behavior.
 575 # Setting this will hurt efficiency of the affected repository.
 576 # Note that fast-import packs ALWAYS get new deltas regardless of this setting.
 577 noreusedeltaopt="--no-reuse-delta"
 578 [ "$(git config --bool --get girocco.redelta 2>/dev/null || :)" != "false" ] || noreusedeltaopt=
 579 alwaysredelta=
 580 [ "$(git config --get girocco.redelta 2>/dev/null || :)" != "always" ] || alwaysredelta=1
 581
 582 # Extract any -f or -F or --no-reuse-object or --no-reuse-delta options
 583 # to be compatible with the old and new gc.sh versions and avoid ugly argument
 584 # duplication in process lists at the same time
 585 # Any options found will override the "girocco.redelta" setting
 586 recompress=
 587 idx=$#
 588 while [ $idx -gt 0 ]; do
 589         idx=$(( $idx - 1 ))
 590         opt="$1"
 591         shift
 592         case "$opt" in
 593         -f|--no-reuse-delta)
 594                 alwaysredelta=1
 595                 continue
 596                 ;;
 597         -F|--no-reuse-object)
 598                 alwaysredelta=1
 599                 recompress=1
 600                 continue
 601                 ;;
 602         -?*)
 603                 ;;
 604         *)
 605                 printf >&2 '%s\n' "bad non-option argument: $opt"
 606                 echo >&2 "(Did you perhaps intend to use a --xxx=yyy form?)"
 607                 exit 1
 608         esac
 609         [ -z "$opt" ] || set -- "$@" "$opt"
 610 done
 611 if [ -n "$alwaysredelta" ]; then
 612         noreusedeltaopt="--no-reuse-delta"
 613         [ -z "$recompress" ] || noreusedeltaopt="--no-reuse-object"
 614 fi
 615
 616 trap 'e=$?; rm -f .gc_in_progress; if [ $e != 0 ]; then echo "gc failed dir: $PWD" >&2; fi' EXIT
 617 trap 'exit 130' INT
 618 trap 'exit 143' TERM
 619
 620 # date -R is linux-only, POSIX equivalent is '+%a, %d %b %Y %T %z'
 621 datefmt='+%a, %d %b %Y %T %z'
 622
 623 isminigc=
 624 if [ "${force_gc:-0}" = "0" ] && check_interval lastgc $cfg_min_gc_interval; then
 625         if [ -e .needsgc ]; then
 626                 isminigc=1
 627         else
 628                 progress "= [$proj] garbage check skip (last at $(config_get lastgc))"
 629                 exit 0
 630         fi
 631 fi
 632 if [ -e .nogc ]; then
 633         progress "x [$proj] garbage check disabled"
 634         exit 0
 635 fi
 636 if [ -z "$isminigc" ] && [ -e .delaygc ] && [ -e .needsgc ]; then
 637         # Eligible for a full gc but .delaygc is set so it would be skipped
 638         # However .needsgc is also set so transform it into a mini instead
 639         isminigc=1
 640         progress "~ [$proj] garbage check delayed but checking mini because .needsgc"
 641 fi
 642
 643 if [ -n "$isminigc" ]; then
 644         # Perform a "mini" gc
 645         # Note that .delaygc is ignored here as that's only intended for full gc
 646         lock_gc
 647         rm -f .allowgc .needsgc
 648         rm -f objects/pack/pack-*_r.keep
 649         remove_crud
 650         coalesce_reflogs
 651         prune_reflogs
 652         compact_reflogs
 653         maintain_auto_gc_hack
 654         generate_auto_gc_update
 655         miniactive=
 656         if [ -f .svnpack ] && [ -n "$svn_mirror" ]; then
 657                 miniactive=1
 658                 progress "+ [$proj] mini garbage check ($(date))"
 659                 make_svn_pack
 660         fi
 661         if [ -z "$cfg_delay_gfi_redelta" ] && [ -n "$gfi_mirror" ]; then
 662                 # $Girocco::Config::delay_gfi_redelta is false, force redeltification now
 663                 if [ -z "$miniactive" ]; then
 664                         miniactive=1
 665                         progress "+ [$proj] mini garbage check ($(date))"
 666                 fi
 667                 repack_gfi_packs
 668         fi
 669         # If there aren't at least 10 non-keep, non-bitmap, non-bndl packs then
 670         # don't actually process them yet
 671         lpo="--exclude-no-idx --exclude-keep --exclude-bitmap --exclude-bndl --quiet"
 672         packcnt="$(list_packs --count $lpo objects/pack)" || :
 673         if [ "${packcnt:-0}" -ge 10 ]; then
 674                 if [ -z "$miniactive" ]; then
 675                         miniactive=1
 676                         progress "+ [$proj] mini garbage check ($(date))"
 677                 fi
 678                 if [ -n "$gfi_mirror" ]; then
 679                         repack_gfi_packs
 680                         packcnt="$(list_packs --count $lpo objects/pack)" || :
 681                 fi
 682                 # if repack_gfi_packs dropped the pack count to < 10 don't combine
 683                 if [ "${packcnt:-0}" -ge 10 ]; then
 684                         combine_small_packs
 685                         packcnt="$(list_packs --count $lpo objects/pack)" || :
 686                 fi
 687                 # if we still have more than 10 packs trigger a full gc
 688                 if [ "${packcnt:-0}" -ge 10 ]; then
 689                         # We shouldn't be in a .delaygc state at this point, but if
 690                         # we are then nuke it because we really need a full gc now
 691                         rm -f .delaygc
 692                         git config --unset gitweb.lastgc
 693                         rm -f "$lockf"
 694                         git update-server-info # just in case
 695                         progress "- [$proj] mini garbage check triggering full gc too many packs ($(date))"
 696                         exit 0
 697                 fi
 698         fi
 699         rm -f "$lockf"
 700         if [ -n "$miniactive" ]; then
 701                 git update-server-info
 702                 progress "- [$proj] mini garbage check ($(date))"
 703         else
 704                 progress "= [$proj] mini garbage check nothing but crud removal to do ($(date))"
 705         fi
 706         exit 0
 707 fi
 708
 709 # Avoid unnecessary garbage collections:
 710 #   1. If lastreceive is set and is older than lastgc
 711 #   -AND-
 712 #   2. We are not a fork (! -s alternates) -OR- lastparentgc is older than lastgc
 713
 714 # If lastgc is NOT set or lastreceive is NOT set we MUST run gc
 715 # If we are a fork and lastparentgc is NOT set we MUST run gc
 716
 717 # If the repo is dirty after removing any crud we MUST run gc
 718
 719 gcstart="$(date "$datefmt")"
 720 skipgc=
 721 isfork=
 722 ! [ -s objects/info/alternates ] || isfork=1
 723 lastparentgcsecs=
 724 [ -z "$isfork" ] || lastparentgcsecs="$(config_get_date_seconds lastparentgc)" || :
 725 lastreceivesecs=
 726 if lastreceivesecs="$(config_get_date_seconds lastreceive)" &&
 727    [ "${force_gc:-0}" = "0" ] &&
 728    lastgcsecs="$(config_get_date_seconds lastgc)" &&
 729    [ $lastreceivesecs -lt $lastgcsecs ]; then
 730         # We've run gc since we last received, so maybe we can skip,
 731         # check if not fork or fork and lastparentgc < lastgc
 732         if [ -n "$isfork" ]; then
 733                 if [ -n "$lastparentgcsecs" ] &&
 734                    [ $lastparentgcsecs -lt $lastgcsecs ]; then
 735                         # We've run gc since our parent ran gc so we can skip
 736                         skipgc=1
 737                 fi
 738         else
 739                 # We don't have any alternates (we're not a forK) so we can skip
 740                 skipgc=1
 741         fi
 742 fi
 743
 744 # Prevent any other simultaneous gc operations
 745 lock_gc
 746
 747 # At this point, if .allowgc or .gc_failed exists, it's now crud to be removed
 748 rm -f .allowgc .gc_failed
 749
 750 # Ideally we would do this in post-receive, but that would mean duplicating the
 751 # logic so it's available in the chroot jail and that's highly undesirable
 752 # Instead, since the first gc will be triggered immediately following the first
 753 # push, we do the check here as it's quick and harmless if HEAD is already valid
 754 check_and_set_head || :
 755
 756 # Always get rid of crud
 757 remove_crud
 758
 759 # Always perform reflogs maintenance
 760 coalesce_reflogs
 761 prune_reflogs
 762 compact_reflogs
 763
 764 # Always maintain auto gc hack
 765 maintain_auto_gc_hack
 766 generate_auto_gc_update
 767
 768 # Run 'git svn gc' now for svn mirrors
 769 if [ -n "$svn_mirror" ]; then
 770         git svn gc || :
 771 fi
 772
 773 # Skip the actual gc if .delaygc is set
 774 if [ -e .delaygc ]; then
 775         progress "x [$proj] garbage check delayed (except for crud removal)"
 776         rm -f "$lockf"
 777         exit 0
 778 fi
 779
 780 # Do not skip gc if the repo is dirty
 781 if [ -n "$skipgc" ] && ! is_dirty; then
 782         progress "= [$proj] garbage check nothing but crud removal to do ($(date))"
 783         config_set lastgc "$gcstart"
 784         rm -f "$lockf"
 785         exit 0
 786 fi
 787
 788 bumptime=
 789 if [ -n "$isfork" ] && [ -z "$lastparentgcsecs" ]; then
 790         # set lastparentgc and then update gcstart to be at least 1 second later
 791         config_set lastparentgc "$gcstart"
 792         bumptime=1
 793 fi
 794 if [ -z "$lastreceivesecs" ]; then
 795         # set lastreceive and then update gcstart to be at least 1 second later
 796         config_set lastreceive "$gcstart"
 797         bumptime=1
 798 fi
 799 if [ -n "$bumptime" ]; then
 800         sleep 1
 801         gcstart="$(date "$datefmt")"
 802 fi
 803
 804 progress "+ [$proj] garbage check ($(date))"
 805
 806 newdeltas=
 807 [ -z "$alwaysredelta" ] || newdeltas="$noreusedeltaopt"
 808 if [ -z "$newdeltas" ] && [ -n "$gfi_mirror" ]; then
 809         if [ $(list_packs --exclude-no-idx --count objects/pack) -le \
 810              $(list_packs --exclude-no-idx --count --quiet --only gfi-packs) ]; then
 811                 # Don't bother with repack_gfi_packs since everything's being repacked
 812                 newdeltas="--no-reuse-delta"
 813         fi
 814 fi
 815 if [ -z "$newdeltas" ] && [ -n "$noreusedeltaopt" ] &&
 816    [ $(list_packs --exclude-no-idx --count-objects objects/pack) -le $var_redelta_threshold ]; then
 817         # There aren't enough objects to worry about so just redelta to get the best pack
 818         newdeltas="--no-reuse-delta"
 819 fi
 820 if [ -z "$newdeltas" ]; then
 821         # Since we're not going to recompute deltas overall, we need to do the
 822         # "mini" maintenance so that we can get more optimal deltas
 823         [ -z "$noreusedeltaopt" ] || make_svn_pack
 824         repack_gfi_packs
 825         force_single_pack_redelta=
 826         [ -n "$gfi_mirror" ] || [ -n "$svn_mirror" ] || force_single_pack_redelta=1
 827         [ -z "$noreusedeltaopt" ] || combine_small_packs $force_single_pack_redelta
 828 fi
 829
 830 #
 831 ## Safe Pruning In Forks
 832 ##
 833 ## We are about to perform garbage collection.  We do NOT use the "git gc" or
 834 ## the "git repack" commands directly as they do not provide enough control over
 835 ## the fine details.  However, we DO maintain a "gc.pid" file during our garbage
 836 ## collection so that a simultaneous "git gc" by an administrator will be
 837 ## blocked (and similarly we refuse to start garbage collection if we cannot
 838 ## create the "gc.pid" file).
 839 ##
 840 ## When we say "gc" in the below description we are referring to our "gc.sh"
 841 ## script, NOT the "git gc" command.
 842 ##
 843 ## If the project we are running garbage collection (gc) on has any forks we
 844 ## must be careful not to remove any objects that while no longer referenced by
 845 ## this project (the parent) are still referenced by one or more forks (the
 846 ## children) otherwise the children will become corrupt and we can't abide
 847 ## corrupt children.
 848 ##
 849 ## One way to accomplish this is to simply hard-link all currently existing
 850 ## loose objects and packs in the parent into all the children that refer to the
 851 ## parent (via a line in their objects/info/alternates file) before beginning
 852 ## the gc operation and then relying on a subsequent gc in the child to clean up
 853 ## any excess objects/packs.  We used to use this strategy but it's very
 854 ## inefficient because:
 855 ##
 856 ##   1. The disk space used by the old pack(s)/object(s) will not be reclaimed
 857 ##      until all children (and their children, if any) run gc by which time
 858 ##      it's quite possible the topmost parent will have run gc again and
 859 ##      hard-linked yet another old pack down to its children (not to mention
 860 ##      loose objects).
 861 ##
 862 ##   2. When using the "-A" option with "git repack", any new objects in the
 863 ##      parent that are not referenced by children will continually get
 864 ##      exploded out of the hard-linked pack in the children whenever the
 865 ##      children run gc.
 866 ##
 867 ##   3. To avoid suboptimal and/or unnecessarily many packs being hard-linked
 868 ##      into child forks, we must run the "mini" gc maintenance before we
 869 ##      perform the hard-linking into the children which provides yet another
 870 ##      source of inefficiency.
 871 ##
 872 ## While we were still using the "-A" option to "git repack" (that was not
 873 ## always the case) to guarantee we can access old ref values for long enough
 874 ## to send out a meaningful mail.sh notification, another, more efficient,
 875 ## option became available to prevent corruption of child forks that continue
 876 ## to refer to objects that are no longer reachable from any ref in the parent.
 877 ##
 878 ## The only things that need be copied (or hard-linked) into the child fork(s)
 879 ## are those objects that have become unreachable from any ref in the parent.
 880 ##
 881 ## When we were using the "git repack -A -d" + "git prune --expire=1.day.ago"
 882 ## technique, the only objects that could ever be removed were loose objects
 883 ## that "git prune" determined were expired.  In that case, loose objects were
 884 ## all that need be hard-linked down to child forks in order to avoid
 885 ## corruption of any child fork(s).
 886 ##
 887 ## The "git repack -A -d" + "git prune --expire=1.day.ago" + hard-linking loose
 888 ## objects to child forks technique remains fundamentally sound from the
 889 ## perspective of supporting simultaneous gc and push and keeping newly
 890 ## unreachable objects around long enough to be sure we can send out meaningful
 891 ## ref change notifications and never corrupting any child forks and never
 892 ## persisting the lifetime of large old packs containing mostly duplicate or
 893 ## unreachable objects as gc percolates through a project's entire fork tree.
 894 ##
 895 ## However, that technique suffers from one potential prodigious pitfall.
 896 ##
 897 ## Unreachable objects come flying out of their packs to splatter all over the
 898 ## objects subdirectories possibly creating a huge, inefficient mess.
 899 ##
 900 ## Often this is not an issue.  Even with a lot of rebasing going on, usually
 901 ## the only objects that will splatter are some commits, trees and the odd blob
 902 ## here and there.  Not enough to be overly concerned about.
 903 ##
 904 ## However, for the reppository that frequently experiences a lot of non-fast-
 905 ## forward updates and/or outright ref deletion, the number of objects suddenly
 906 ## popping out of their packs at "git repack -A -d" time can be overwhelming.
 907 ##
 908 ## To avoid this issue we now use a four phase pack creation strategy.
 909 ## This will result in creation of up to four packs (instead of at most one).
 910 ##
 911 ##   I. A complete pack (with bitmaps if appropriate) gets created including
 912 ##      only "reachable" objects from all refs/... refs plus HEAD.  This will
 913 ##      also serve as the virtual bundle for the repository.
 914 ##
 915 ##  II. A pack of recently-became-unreachable objects and friends is created.
 916 ##      (The "friends" are ref logs, linked working tree HEADs and indicies.)
 917 ##      Because both the pre-receive and update.sh script record all ref
 918 ##      changes we can easily choose the cut off point for "recently".
 919 ##      It is only the fact we maintain those logs in the reflogs subdirectory
 920 ##      that allows this step to be possible.
 921 ##
 922 ## III. If the repository has any forks with a non-zero length alternates file,
 923 ##      yet another pack of "--keep-unreachable" objects is generated that will
 924 ##      not actually be kept in the parent, but hard-linked into all the forks.
 925 ##
 926 ##  IV. Finally, after running "git prune-packed", any remaining loose objects
 927 ##      are migrated into a pack of their own.
 928 ##
 929 ## We then remove any non-.keep packs that existed before we started the
 930 ## process being careful to keep any same-pack pushes for the "Push Pack Redux"
 931 ## race condition (see README-GC).
 932 ##
 933 ## By using "git pack-objects" directly we are able to accomplish this with
 934 ## very little additional effort.
 935 ##
 936 ## The packs produced by (III) are treated almost like ".keep" packs by child
 937 ## forks in that the objects in them are never repacked into any other
 938 ## "--keep-unreachable" packs (but they can migrate into phase I or II packs)
 939 ## and those phase III packs are then hard-linked into any grandchild forks.
 940 ##
 941 ## This avoids the space explosion that could occur if each fork level ended
 942 ## up duplicating the "--keep-unreachable" pack space by repacking those
 943 ## objects (essentially breaking the hard-link to the single copy of those
 944 ## objects).
 945 ##
 946 ## While it is true that each level of forks could potentially add yet another
 947 ## phase III pack to be hard-linked down to its children, such packs will only
 948 ## include unreachable objects not already in any phase III packs that were
 949 ## received from the parent.
 950 ##
 951 ## The space for the phase III packs will not be reclaimed until the gc
 952 ## finishes percolating through the entire "fork tree" of a project.
 953 ##
 954 ## This is not much different than the "git repack -A -d" situation where
 955 ## all the loose objects are hard-linked down into child forks.  In that
 956 ## case forks that actually need any of those objects could gradually reduce
 957 ## the number of objects hard-linked into deeper fork levels.
 958 ##
 959 ## The difference with a phase III "--keep-unreachable" pack is that there
 960 ## cannot be any gradual reduction like that since it would require repacking
 961 ## the pack and breaking the hard-link thereby increasing storage space.  The
 962 ## storage will instead always be reclaimed all at once when all of the
 963 ## projects in the "fork tree" complete their gc.
 964 ##
 965 ## However, the belief is that the huge space win by having all the
 966 ## unreachable objects packed up together far eclipses (when many objects are
 967 ## involved, the single-pack version can end up using 1/20th or less of the
 968 ## disk space compared to having them all as loose objects) any brief minor
 969 ## space savings that might occur under the "git repack -A -d" loose object
 970 ## system prior to the gc collection completing for all the projects in the
 971 ## "fork tree".
 972 #
 973
 974 #
 975 ## utility functions
 976 #
 977
 978 # rename_pack oldnamepath newnamepath
 979 # note that .keep files are left untouched and not moved at all!
 980 rename_pack() {
 981         [ $# -eq 2 ] && [ "$1" != "$2" ] || {
 982                 echo >&2 "[$proj] incorrect use of rename_pack function"
 983                 exit 1
 984         }
 985         # Git assumes that if the destination of the rename already exists
 986         # that it is, in fact, a copy of the same bytes so silently succeeds
 987         # without doing anything.  We duplicate that logic here.
 988         # Git checks for the .idx file first before even trying to use a pack
 989         # so it should be the last moved and the first removed.
 990         for ext in pack bitmap idx; do
 991                 [ -f "$1.$ext" ] || continue
 992                 ln "$1.$ext" "$2.$ext" >/dev/null 2>&1 ||
 993                 [ -f "$2.$ext" ] || {
 994                         echo >&2 "[$proj] unable to move $1.$ext to $2.$ext"
 995                         exit 1
 996                 }
 997         done
 998         for ext in idx pack bitmap; do
 999                 rm -f "$1.$ext"
1000         done
1001         return 0
1002 }
1003
1004 make_packs_ugw() {
1005         find -L "$1" -maxdepth 1 -type f ! -perm -ug+w \
1006                 -name "pack-$octet20*.pack" -exec chmod ug+w '{}' + || :
1007 } 2>/dev/null
1008
1009 vcnt() {
1010         eval "$1="'$(( $# - 1 ))'
1011 }
1012
1013 get_index_tree() {
1014         if [ -s "$1" ]; then
1015                 GIT_INDEX_FILE="$1"
1016                 export GIT_INDEX_FILE
1017                 git write-tree 2>/dev/null || :
1018                 unset GIT_INDEX_FILE
1019         fi
1020 }
1021
1022 get_detached_head() {
1023         if [ -s "$1" ] && read -r _head <"$1" 2>/dev/null; then
1024                 case "$_head" in $octet20*)
1025                         echo "$_head"
1026                 esac
1027         fi
1028 }
1029
1030 # compute_extra_reachables
1031 # create lines suitable for a packed-refs file mentioning all the
1032 # other refs we might like to keep.
1033 # the current directory MUST be set to the repository's --git-dir
1034 # the following are included:
1035 #   * refs mentioned in reflogs/... files
1036 #   * tree(s) created from index file(s)
1037 #   * detached linked working tree heads
1038 # Resulting objects are tested for existence and uniqified then output
1039 # one per line under a refs/z* namespace
1040 compute_extra_reachables() {
1041         {
1042                 digits8='[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]'
1043                 find -L reflogs -mindepth 1 -maxdepth 1 -type f -name "$digits8*" -exec gzip -c -d -f '{}' + |
1044                 awk '{print $2; print $3}'
1045                 ! [ -f index ] || get_index_tree index
1046                 if [ -d worktrees ]; then
1047                         find -L worktrees -mindepth 2 -maxdepth 2 -name HEAD -type f -print |
1048                         while read -r lwth; do
1049                                 get_detached_head "$lwth"
1050                                 get_index_tree "${lwth%HEAD}index"
1051                         done
1052                 fi
1053         } | LC_ALL=C sort -u |
1054         git cat-file ${var_have_git_260:+--buffer} --batch-check"${var_have_git_185:+=%(objectname)}" |
1055         awk '!/missing/ {num++; print $1 " " "refs/" substr("zzzzzzzzzzzz", 1, length(num)) "/" num}'
1056 }
1057
1058 #
1059 ## main gc logic
1060 #
1061
1062 # Everything else is more efficient if we do this first
1063 # The "--prune" option is the default since v1.5.0 but it serves as "documentation" here
1064 git pack-refs --all --prune
1065 [ -e packed-refs ] || >>packed-refs # should never happen...
1066
1067 # If we have a logs directory or a worktrees directory expire the ref logs now
1068 # Note that Git itself does not use either --rewrite or --updateref, so neither do we
1069 ! [ -d logs ] && ! [ -d worktrees ] || eval git reflog expire --all "${quiet:+>/dev/null 2>&1}" || :
1070
1071 make_repack_dir
1072 ! [ -e .gc_failed ] || exit 1
1073 rm -f .gc_in_progress # make sure
1074 touch .gc_in_progress # it's truly fresh
1075 rm -f bundles/* objects/pack/pack-*.bndl
1076 # This is perhaps a bit aggressive in that if we're suffering from "Push Pack Redux"
1077 # and somehow we get run again immediately after the run where "Push Pack Redux" happened
1078 # and we have garbage collection forced, there's just the barest, almost negligible,
1079 # possibility that the "Push Pack Redux" ref updates _still_ have not happened and we
1080 # should not be removing _r .keep files.  None of the normal Girocco processing can
1081 # cause this.  The second run of this script would have to use the force gc option
1082 # for it to even be possible in the first place.  What's much more likely is that
1083 # the initial run of this script was somehow interrupted in the middle before it
1084 # could get rid of the _r .keep file itself in which case it's better to get rid of
1085 # it now to avoid keeping something around that would perturb our nice and neat gc
1086 rm -f objects/pack/pack-*_r.keep
1087 # We will add .keep files for _u packs if and when we run phase III
1088 # Otherwise they need to not have any .keep files during phases I and II
1089 rm -f objects/pack/pack-*_u.keep
1090
1091 # We need to make sure that any non-Girocco (barely tolerated) Git object creation
1092 # activity will be able to "freshen" the pack containing a pre-existing object
1093 # that's being written.  This really should not be necessary as the pre-receive
1094 # hook should make sure this takes place for any incoming pushes.
1095 # However, do it here anyway just in case.
1096 make_packs_ugw objects/pack
1097
1098 # This is only effective with Git v2.3.5 and later and it will only matter when
1099 # we are using one of the "internal_rev_list" modes of pack-objects
1100 # (the combine-packs.sh script never uses any of those modes)
1101 # The "git repack" and "git prune" commands always sets this internally themselves
1102 # It makes no difference if there's no repository corruption
1103 GIT_REF_PARANOIA=1 && export GIT_REF_PARANOIA
1104
1105 # All of the options we might want to use with pack-objects were supported
1106 # at some point prior to Git version v1.6.6 which is the minimum version that
1107 # Girocco now requires.  Except for one (--use-bitmap-index).  Several of them
1108 # are "boiler plate" options we always want to use so we bundle them up here.
1109 pkopt="--delta-base-offset --keep-true-parents --non-empty --all-progress-implied"
1110 # We want to use --include-tag, but before Git v2.10.1 it would leave out
1111 # "middle" tags (e.g. a tag of a tag of a commit would omit the tagged tag)
1112 # See http://repo.or.cz/git.git/b773ddea2cd3b08c for details
1113 # ("pack-objects: walk tag chains for --include-tag", 2016-09-07, v2.10.1)
1114 # This is not a free check as it matches all refs against refs/tags/ then
1115 # peels all the annotated tags and checks for inclusion.  The situation in
1116 # which it would add a tag that was not already included by a reachability
1117 # trace that included tag starting points can only occur if a new tag gets
1118 # pushed during gc pointing to something that would have been packed anyway.
1119 # But, it could happen and, really, campared to gc as a whole it's not that
1120 # expensive to perform (provided we do not get an unconnected pack).
1121 [ -z "$var_have_git_2101" ] || pkopt="$pkopt --include-tag"
1122 pkopt="$pkopt ${quiet:---progress} $packopts"
1123
1124 # The git pack-objects command only supports bitmaps if all objects are being
1125 # packed (the "--all" option) and the "--stdout" option is NOT being used.
1126 # Additionally, while packing, if any encountered reachable objects are
1127 # determined to be "not wanted" then no bitmap index will be written anyway.
1128 # While it is theoretically possible that a project with a non-empty alternates
1129 # file ends up packing all objects (because it does not actually use any of the
1130 # objects found in the alternates), it's very unlikely.  And, in the unlikely
1131 # event that did occur, clients would see a message about only using one bitmap
1132 # because Git can only use one bitmap at a time and at least one of the
1133 # alternates is bound to have a bitmap.  Therefore if we see a non-empty
1134 # alternates file, we disable writing bitmaps which avoids the warning and any
1135 # possibility of a client warning as well.  Also if we are running anything
1136 # before Git v2.1.0 (the effective version for repack.writeBitmaps=true) then
1137 # we also always disable bitmap writing.
1138 wbmopt=
1139 [ -z "$var_have_git_210" ] || wbmopt="--write-bitmap-index"
1140 # More recent versions of pack-objects have optimizations when not using the
1141 # --local option.  If we do not have any alternates it's a pointless option.
1142 # If we do have alternates we need to skip writing a bitmap and we cannot
1143 # have a bundle since it must contain all objects.
1144 if [ -n "$isfork" ]; then
1145         lclopt="--local"
1146         wbmopt=
1147         makebndl=
1148 else
1149         lclopt=
1150         makebndl=1
1151 fi
1152
1153 #
1154 ## Phase I
1155 #
1156
1157 wbmstr=
1158 [ -n "$wbmopt" ] || wbmstr=" (bitmaps disabled)"
1159 progress "~ [$proj] running primary full gc pack-objects$wbmstr"
1160
1161 gotforks=
1162 ! has_forks_with_alternates "$proj" || gotforks=1
1163
1164 # To avoid "Push Pack Redux" (see README-GC), after collecting the initial
1165 # preexisting non-keep pack list, we rename them so that an incoming push
1166 # pack cannot possibly experience a pack name collision.  Git does not require
1167 # use of the "default" pack names, simply that the proper extensions are used.
1168 # We rename to insert an "_r" just before the extension to avoid "Push Pack Redux"
1169 # name collisions.  Later on we may create an "unreachable" pack for hard-linking
1170 # down into forks and it will have an "_u" inserted just before its extension.
1171 packlist="$(list_packs -C objects/pack --exclude-no-idx --exclude-keep --quiet .)" || :
1172 oldpacks=
1173 for oldpack in $packlist; do
1174         oldpack="${oldpack#pack-}"
1175         oldpack="${oldpack%.pack}"
1176         [ -f "objects/pack/pack-$oldpack.pack" ] || {
1177                 echo >&2 "[$proj] unable to list old pack files"
1178                 exit 1
1179         }
1180         if [ "${oldpack#*[!0-9a-fA-F]}" != "$oldpack" ]; then
1181                 # names not exclusively hexadecimal do not need renaming
1182                 oldpacks="${oldpacks:+$oldpacks }$oldpack"
1183                 continue
1184         fi
1185         rename_pack "objects/pack/pack-$oldpack" "objects/pack/pack-${oldpack}_r" || {
1186                 echo >&2 "[$proj] unable to rename old pack files"
1187                 exit 1
1188         }
1189         # If the oldpack has a .keep now it means a "Push Pack Redux" is actually
1190         # in progress at this moment and we need to .keep the renamed pack,
1191         # otherwise no "Push Pack Redux" has started yet or it has already finished.
1192         # In either case we're okay because if it's just finished then all ref
1193         # changes have already been made so we don't need a .keep and we will
1194         # see the ref changes and grab all the objects via a reachability trace.
1195         # If it hasn't started yet that's okay because we're done moving that
1196         # name so a complete pack will appear under the old name that we'll
1197         # leave alone.
1198         if [ -f "objects/pack/pack-$oldpack.keep" ]; then
1199                 echo "Push Pack Redux" >"objects/pack/pack-${oldpack}_r.keep"
1200         else
1201                 oldpacks="${oldpacks:+$oldpacks }${oldpack}_r"
1202         fi
1203 done
1204
1205 # We wish to keep deltas from our last full pack so if we're not redeltaing
1206 # then make sure the .pack associated with the .bitmap has a newer mod time
1207 # (If there is no .bitmap then touch the pack with the most objects instead.)
1208 if [ -z "$newdeltas" ]; then
1209         bmpack="$(list_packs --exclude-no-bitmap --exclude-no-idx --max-matches 1 objects/pack)"
1210         [ -n "$bmpack" ] || bmpack="$(list_packs --exclude-no-idx --max-matches 1 --object-limit -1 --include-boundary objects/pack)"
1211         if [ -n "$bmpack" ] && [ -f "$bmpack" ] && [ -s "$bmpack" ]; then
1212                 sleep 1
1213                 touch -c "$bmpack" 2>/dev/null || :
1214                 # We must touch .gc_in_progress here to avoid $bmpack looking
1215                 # like it's been "freshened" when redundant packs are removed
1216                 # It's okay if they have the same mod time, but POSIX does not
1217                 # guarantee an ordering for the "touching" that occurs which is
1218                 # why this must be a separate command but needs no "sleep 1"
1219                 touch .gc_in_progress
1220         fi
1221 fi
1222
1223 # Now we need to make sure that any "freshening" that takes place will actually
1224 # result in a "newer" modification time than the .gc_in_progress file now has
1225 sleep 1
1226
1227 # We run git pack-objects from the repack subdirectory so we can force
1228 # optimized packs to be generated even for repositories that do not have any
1229 # tagged commits
1230 packs="$(git --git-dir=repack pack-objects </dev/null \
1231         $pkopt --all $newdeltas $lclopt ${wbmopt:---honor-pack-keep} "$@" repack/alt/pack/pack)"
1232 vcnt packcnt $packs
1233 [ $packcnt -eq 1 ] || makebndl=
1234
1235 #
1236 ## Phase II
1237 #
1238
1239 progress "~ [$proj] running supplementary gc pack-objects"
1240
1241 # Add the "supplementary" refs
1242 compute_extra_reachables >>repack/packed-refs
1243
1244 # Subtract the primary refs
1245 GIT_ALTERNATE_OBJECT_DIRECTORIES="$PWD/repack/alt"
1246 export GIT_ALTERNATE_OBJECT_DIRECTORIES
1247
1248 # For this one we MUST use --local and MUST NOT use --write-bitmap-index
1249 # However, if there is a "logs" subdirectory we need to use --reflog
1250 # We do add it, just in case, if the linked working trees dir is present
1251 # We do not add --indexed-objects as that requires v2.2.0 and it's unclear
1252 # if it properly includes linked working tree index files or not.  The
1253 # above compute_extra_reachables has already included all index trees (thereby
1254 # providing proper --indexed-objects support for all Git versions) making the
1255 # option completely unnecessary.
1256 rflopt=
1257 ! [ -d logs ] && ! [ -d worktrees ] || rflopt=--reflog
1258 spacks="$(git --git-dir=repack pack-objects </dev/null \
1259         $pkopt --honor-pack-keep --all $rflopt $newdeltas --local "$@" repack/alt/pack/pack)"
1260
1261 #
1262 ## Phase III
1263 #
1264
1265 # There's nothing to do for Phase III unless we have forks that refer to our
1266 # project from their alternates file
1267 hlpacks=
1268 upacks=
1269 if [ -n "$gotforks" ]; then
1270
1271         progress "~ [$proj] running keep-unreachable gc pack-objects for forks"
1272
1273         # If we are a fork, any pre-existing _u packs need to have a .keep
1274         # for this phase and be added to the hlpacks list otherwise (we are
1275         # not a fork) pre-existing _u packs are anomalies to be treated like
1276         # regular non-_u packs
1277         if [ -n "$isfork" ]; then
1278                 for upack in $(find -L objects/pack -mindepth 1 -maxdepth 1 -name "pack-$octet20*_u.pack" -print); do
1279                         upack="${upack%.pack}"
1280                         [ -e "$upack.keep" ] || echo "unreachable" >"$upack.keep"
1281                         hlpacks="${hlpacks:+$hlpacks }${upack#objects/pack/pack-}"
1282                 done
1283         fi
1284         # Using either --no-reuse-delta or --no-reuse-object together with the
1285         # --keep-unreachable option is a very, very, very bad idea when good
1286         # packs are the desired outcome.  If newdeltas are being generated
1287         # then we pack to a temp name, and use combine-packs.sh to get a better
1288         # pack as the result to avoid making a bad --keep-unreachable pack
1289         pfx=
1290         [ -z "$newdeltas" ] || pfx="ku"
1291         upacks="$(git --git-dir=repack pack-objects </dev/null \
1292                 $pkopt --honor-pack-keep --all $rflopt --keep-unreachable --local "$@" repack/alt/pack/${pfx}pack)"
1293         if [ -n "$upacks" ] && [ -n "$newdeltas" ]; then
1294                 progress "~ [$proj] rebuilding keep-unreachable pack deltas"
1295                 oldupacks="$upacks"
1296                 upacks="$(
1297                         printf "repack/alt/pack/${pfx}pack-%s.pack\n" $oldupacks |
1298                         run_combine_packs --names --weak-naming --non-empty --all-progress-implied ${quiet:---progress} \
1299                                 $packopts $newdeltas "$@" repack/alt/pack/pack)"
1300                 eval rm -f "$(printf \""repack/alt/pack/${pfx}pack-%s.*"\"" " $oldupacks)"
1301         fi
1302         for upack in $upacks; do
1303                 rename_pack "repack/alt/pack/pack-$upack" "repack/alt/pack/pack-${upack}_u"
1304         done
1305         rm -f objects/pack/pack-*_u.keep
1306         [ -z "$hlpacks" ] && [ -z "$upacks" ] ||
1307         progress "~ [$proj] hard-linking keep-unreachable pack(s) into immediate child forks"
1308
1309         # We have to update the lastparentgc time in the child forks even if they do not get any
1310         # new "unreachable packs" because they need to run gc just in case the parent now has some
1311         # objects that used to only be in the child so they can be removed from the child.
1312         # For example, a "patch" might be developed first in a fork and then later accepted into
1313         # the parent in which case the objects making up the patch in the child fork are now
1314         # redundant (since they're now in the parent as well) and need to be removed from the
1315         # child fork which can only happen if the child fork runs gc.
1316         lastparentgc="$(date "$datefmt")"
1317
1318         # It is enough to copy objects just one level down and get_repo_list
1319         # takes a regular expression (which is automatically prefixed with '^')
1320         # so we can easily match forks exactly one level down from this project
1321         forkdir="$proj"
1322         get_repo_list "$forkdir/[^/:][^/:]*:" |
1323         while read fork; do
1324                 # Ignore forks that do not exist or are symbolic links
1325                 ! [ -L "$cfg_reporoot/$fork.git" ] && [ -d "$cfg_reporoot/$fork.git" ] ||
1326                         continue
1327                 # Or do not have a non-zero length alternates file
1328                 [ -s "$cfg_reporoot/$fork.git/objects/info/alternates" ] ||
1329                         continue
1330                 runupdate=
1331                 # Match hlpacks in parent project if any
1332                 if [ -n "$hlpacks" ]; then
1333                         mkdir -p "$cfg_reporoot/$fork.git/objects/pack"
1334                         eval ln -f "$(printf '"objects/pack/pack-%s.pack" ' $hlpacks)" \
1335                                 "$(printf '"objects/pack/pack-%s.idx" ' $hlpacks)" \
1336                                 '"$cfg_reporoot/$fork.git/objects/pack/"'
1337                         runupdate=1
1338                 fi
1339                 # Match upacks in repack/alt area if any
1340                 if [ -n "$upacks" ]; then
1341                         mkdir -p "$cfg_reporoot/$fork.git/objects/pack"
1342                         eval ln -f "$(printf '"repack/alt/pack/pack-%s_u.pack" ' $upacks)" \
1343                                 "$(printf '"repack/alt/pack/pack-%s_u.idx" ' $upacks)" \
1344                                 '"$cfg_reporoot/$fork.git/objects/pack/"'
1345                         runupdate=1
1346                 fi
1347                 if ! [ -e "$cfg_reporoot/$fork.git/.needsgc" ]; then
1348                         # Trigger a mini gc in the fork if it now has too many packs
1349                         packs="$(list_packs --quiet --count --exclude-no-idx --exclude-keep "$cfg_reporoot/$fork.git/objects/pack")" || :
1350                         if [ -n "$packs" ] && [ "$packs" -ge 20 ]; then
1351                                 >"$cfg_reporoot/$fork.git/.needsgc"
1352                         fi
1353                 fi
1354                 [ -z "$runupdate" ] || git --git-dir="$cfg_reporoot/$fork.git" update-server-info
1355                 # Update the fork's lastparentgc date (must be more recent than $gcstart)
1356                 git --git-dir="$cfg_reporoot/$fork.git" config gitweb.lastparentgc "$lastparentgc"
1357         done
1358 fi
1359
1360 # Now move any primary/supplementary packs back into objects/pack
1361 # then drop any "unfreshened" redundant packs and clear repack/alt
1362
1363 # First make sure the primary pack(s) have the most recent mod time
1364 if [ -n "$packs" ]; then
1365         [ -z "$spacks" ] || sleep 1
1366         printf 'repack/alt/pack/pack-%s.pack\n' $packs | xargs touch -c 2>/dev/null || :
1367 fi
1368
1369 # Move the packs into place
1370 for pack in $packs $spacks; do
1371         rename_pack "repack/alt/pack/pack-$pack" "objects/pack/pack-$pack"
1372 done
1373
1374 # It's possible that one of the $oldpacks had a .bitmap, got renamed (along
1375 # with its .bitmap) and then got "freshened" causing us to not remove it
1376 # However, if $wbmopt is set we most likely now have TWO .bitmap packs!
1377 # This can produce ugly warnings we don't want and possibly get the wrong
1378 # bitmap used since only one .bitmap file can ever be used by Git.
1379 # If this has happened, the .bitmap we want to discard will always have
1380 # an _r infix so we can just zap any such now since it will leave the pack.
1381 [ -z "$wbmopt" ] || rm -f objects/pack/pack-*_r.bitmap || :
1382
1383 # Remove the redundant packs that have not since been "freshened"
1384 # This does not completely eliminate the race condition window (Girocco's own
1385 # activites -- gc/fetch/receive are immune to the race) but it substantially
1386 # shrinks it down to just the time after the find but before the following rm
1387 >repack/oldpacks
1388 [ -z "$oldpacks" ] ||
1389 printf 'objects/pack/pack-%s.pack\n' $oldpacks |
1390 LC_ALL=C sort >repack/oldpacks
1391 find -L objects/pack -maxdepth 1 -type f -name "pack-$octet20*.pack" -newer .gc_in_progress -print |
1392 LC_ALL=C sort >repack/freshened
1393 deadpacks="$(LC_ALL=C join -v 1 repack/oldpacks repack/freshened | LC_ALL=C sed 's/\.pack$//')"
1394 [ -z "$deadpacks" ] ||
1395 eval echo "$(printf '"%s".* ' $deadpacks)" | xargs rm -f || :
1396
1397 # No need for this anymore
1398 rm -rf repack/alt objects/pack/repack
1399 unset GIT_ALTERNATE_OBJECT_DIRECTORIES
1400
1401 #
1402 ## Phase IV
1403 #
1404
1405 progress "~ [$proj] running gc prune-packed"
1406
1407 # We do not want the redundant packs or any new "--keep-unreachable" pack(s) to be
1408 # present while running prune-packed.  We try to guarantee that any loose object
1409 # that's unreachable persists for at least one $Girocco::Config::min_gc_interval
1410 # (not withstanding administrator interference to force earlier gc to occur).
1411 # If we were to include the redundant/keep-unreachable pack(s) when running
1412 # prune-packed and a loose unreachable object happened to be duplicated in one
1413 # of them we would end up removing it too soon and void our guarantee.
1414 git prune-packed $quiet
1415
1416 progress "~ [$proj] running loose objects gc pack-objects"
1417
1418 # Although Git v2.10.0 and later support a --pack-loose-unreachable option,
1419 # we MUST NOT use it for these reasons:
1420 #  1) We're not interested in expensive "unreachable" at this point, only "loose"
1421 #  2) It produces simply horrid packs about 3.8x times larger than they should be
1422 #  3) We don't require anything more than Git v1.6.6
1423 lpacks="$(run_combine_packs </dev/null --names --loose --weak-naming --non-empty --all-progress-implied ${quiet:---progress} $packopts $newdeltas "$@")"
1424
1425 if [ -n "$lpacks" ]; then
1426         # Make sure any primary pack(s) have a more recent mod time than "unreachable" objects packs
1427         if [ -n "$packs" ]; then
1428                 sleep 1
1429                 printf 'objects/pack/pack-%s.pack\n' $packs | xargs touch -c 2>/dev/null || :
1430         fi
1431         # We need to identify these packs later so we don't combine_packs them
1432         for objpack in $lpacks; do
1433                 rename_pack "objects/pack/pack-$objpack" "objects/pack/pack-${objpack}_o" || :
1434         done
1435         # Finally zap the corresponding loose objects
1436         progress "~ [$proj] running packed loose objects gc prune-packed"
1437         git prune-packed $quiet
1438 fi
1439
1440 ! [ -e .gc_failed ] || exit 1
1441 # These, if they exist, are now meaningless and need to be removed
1442 rm -f gfi-packs .needsgc .svnpack .svnpackgc
1443
1444 # Make sure this stays up to date
1445 git update-server-info
1446
1447 # We must make loose objects group writable so that they
1448 # can be freshened by other pushers.  Technically we need only do this for
1449 # push projects but to enable mirror projects to be more easily converted to
1450 # push projects, we go ahead and do it for all projects.
1451 # By the time we get here we really shouldn't have any of these, but just in case.
1452 { find -L objects/$octet -type f -name "$octet19*" -exec chmod ug+w '{}' + || :; } 2>/dev/null
1453
1454 # darcs:// mirrors have a xxx.log file that will grow endlessly
1455 # if this is a mirror and the file exists, shorten it to 10000 lines
1456 # also take this opportunity to optimize the darcs repo
1457 if ! [ -e .nofetch ] && [ -n "$cfg_mirror" ]; then
1458         url="$(config_get baseurl)" || :
1459         case "$url" in darcs://*)
1460                 if [ -n "$cfg_mirror_darcs" ]; then
1461                         url="${url%/}"
1462                         basedarcs="$(basename "${url#darcs:/}")"
1463                         if [ -f "$basedarcs.log" ]; then
1464                                 tail -n 10000 "$basedarcs.log" >"$basedarcs.log.$$"
1465                                 mv -f "$basedarcs.log.$$" "$basedarcs.log"
1466                         fi
1467                         if [ -d "$basedarcs.darcs" ]; then
1468                                 (
1469                                         cd "$basedarcs.darcs"
1470                                         # without show_progress suppress non-error output
1471                                         [ -n "$show_progress" ] || exec >/dev/null
1472                                         # Note that this does not optimize _darcs/inventories/ :(
1473                                         darcs optimize || :
1474                                 )
1475                         fi
1476                 fi
1477         esac
1478 fi
1479
1480 # Create a matching .bndl header file for the all-in-one pack we just created
1481 # but only if we're not a fork (otherwise the bundle would not be complete)
1482 # and we are running at least Git version 1.7.2 (pack_is_complete always fails otherwise)
1483 if [ -n "$makebndl" ] && [ -n "$var_have_git_172" ]; then
1484         # There should only be one pack in $packs but do some checking...
1485         # The one we just created will have a .idx and will NOT have a .keep
1486         progress "~ [$proj] creating downloadble bundle header"
1487         pkbase=
1488         pkhead=
1489         IFS= read -r curhead <repack/HEAD.orig || :
1490         if
1491                 [ -s "objects/pack/pack-$packs.pack" ] &&
1492                 [ -s "objects/pack/pack-$packs.idx" ] &&
1493                 ! [ -e "objects/pack/pack-$packs.keep" ] &&
1494                 pkhead="$(pack_is_complete "$PWD/objects/pack/pack-$packs.pack" \
1495                         "$PWD/repack/packed-refs.orig" "$curhead")"
1496         then
1497                 pkbase="objects/pack/pack-$packs"
1498         fi
1499         if [ -n "$pkbase" ] && [ -n "$pkhead" ]; then
1500                 {
1501                         symref=
1502                         case "$curhead" in "ref: refs/"?*|"ref:refs/"?*|"refs/"?*)
1503                                 symref="${curhead#ref:}"
1504                                 symref="${symref# }"
1505                         esac
1506                         bndlurl=
1507                         [ -z "$cfg_httpbundleurl" ] || bndlurl=" url=$cfg_httpbundleurl/$proj.git/clone.bundle"
1508                         echo "# v2 git bundle"
1509                         LC_ALL=C sed -ne "/^$octet20$hexdig* refs\/[^ $tab]*\$/ p" <repack/packed-refs.orig
1510                         if [ -n "$symref" ]; then
1511                                 printf "$pkhead HEAD\0symref=HEAD:%s%s\n" "$symref" "$bndlurl"
1512                         else
1513                                 if [ -n "$bndlurl" ]; then
1514                                         printf "$pkhead HEAD\0%s\n" "${bndlurl:# }"
1515                                 else
1516                                         echo "$pkhead HEAD"
1517                                 fi
1518                         fi
1519                         echo ""
1520                 } >"$pkbase.bndl"
1521                 bndletag="$("$cfg_basedir/bin/rangecgi" --etag -m 1 "$pkbase.bndl" "$pkbase.pack")" || :
1522                 bndlsha="$(printf '%s' "$bndletag" | git hash-object --stdin)" || :
1523                 if [ -n "$bndletag" ]; then
1524                         case "$bndlsha" in $octet20*)
1525                                 bndlshatrailer="${bndlsha#????????}"
1526                                 bndlshaprefix="${bndlsha%$bndlshatrailer}"
1527                                 bndlname="$(TZ=UTC date +%Y%m%d_%H%M%S)-${bndlshaprefix:-0}"
1528                                 [ -d bundles ] || mkdir bundles
1529                                 echo "${pkbase#objects/pack/}.bndl" >"bundles/$bndlname"
1530                                 echo "${pkbase#objects/pack/}.pack" >>"bundles/$bndlname"
1531                                 ln -s -f -n "$bndlname" bundles/latest
1532                         esac
1533                 fi
1534         fi
1535 fi
1536
1537 # Record the size of this repo as the sum of its clone packed-refs + *.pack sizes as 1024-byte blocks
1538 eval "reposizek=$(( $(
1539         echo 0 $(du -k repack/packed-refs.orig $(printf 'objects/pack/pack-%s.pack ' $packs) 2>/dev/null |
1540                 LC_ALL=C awk '{print $1}') |
1541         LC_ALL=C sed -e 's/ / + /g') ))"
1542 config_set_raw girocco.reposizek "${reposizek:-0}"
1543
1544 # Now we're finally done with this
1545 rm -rf repack
1546
1547 # We didn't used to do anything about rerere or worktrees but we're
1548 # trying to make nice with linked working trees these days :)
1549 # Maybe even non-bare repositories too, but *shush* about those ;)
1550 if [ -n "$var_have_git_250" ] && [ -d worktrees ]; then
1551         # The value "3.months.ago" is hard-coded into gc.c rather than
1552         # having the default be in worktree.c so we must provide it if
1553         # we get nothing out of the gc.worktreePruneExpire config item
1554         # Prior to Git v2.6.0 the config item was gc.pruneworktreesexpire
1555         # however we just always use the newer name no matter what Git version
1556         expiry="$(git config --get gc.worktreePruneExpire 2>/dev/null)" || :
1557         eval git worktree prune --expire '"${expiry:-3.months.ago}"' "${quiet:+>/dev/null 2>&1}" || :
1558 fi
1559 # git rerere does it right and handles its own default/config'd expiration values
1560 ! [ -d rr-cache ] || eval git rerere gc "${quiet:+>/dev/null 2>&1}" || :
1561
1562 # We use $gcstart here to avoid a race where a push occurs during the gc itself
1563 # and the next future gc could be incorrectly skipped if we used the current
1564 # timestamp here instead
1565 config_set lastgc "$gcstart"
1566 rm -f "$lockf"
1567
1568 progress "- [$proj] garbage check ($(date))"