git-fetch.sh

   1 #!/bin/sh
   2 #
   3
   4 USAGE='<fetch-options> <repository> <refspec>...'
   5 SUBDIRECTORY_OK=Yes
   6 . git-sh-setup
   7 set_reflog_action "fetch $*"
   8 cd_to_toplevel ;# probably unnecessary...
   9
  10 . git-parse-remote
  11 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
  12 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
  13
  14 LF='
  15 '
  16 IFS="$LF"
  17
  18 no_tags=
  19 tags=
  20 append=
  21 force=
  22 verbose=
  23 update_head_ok=
  24 exec=
  25 keep=
  26 shallow_depth=
  27 no_progress=
  28 test -t 1 || no_progress=--no-progress
  29 quiet=
  30 while test $# != 0
  31 do
  32         case "$1" in
  33         -a|--a|--ap|--app|--appe|--appen|--append)
  34                 append=t
  35                 ;;
  36         --upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
  37         --upload-pa|--upload-pac|--upload-pack)
  38                 shift
  39                 exec="--upload-pack=$1"
  40                 ;;
  41         --upl=*|--uplo=*|--uploa=*|--upload=*|\
  42         --upload-=*|--upload-p=*|--upload-pa=*|--upload-pac=*|--upload-pack=*)
  43                 exec=--upload-pack=$(expr "z$1" : 'z-[^=]*=\(.*\)')
  44                 shift
  45                 ;;
  46         -f|--f|--fo|--for|--forc|--force)
  47                 force=t
  48                 ;;
  49         -t|--t|--ta|--tag|--tags)
  50                 tags=t
  51                 ;;
  52         -n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
  53                 no_tags=t
  54                 ;;
  55         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
  56         --update-he|--update-hea|--update-head|--update-head-|\
  57         --update-head-o|--update-head-ok)
  58                 update_head_ok=t
  59                 ;;
  60         -q|--q|--qu|--qui|--quie|--quiet)
  61                 quiet=--quiet
  62                 ;;
  63         -v|--verbose)
  64                 verbose="$verbose"Yes
  65                 ;;
  66         -k|--k|--ke|--kee|--keep)
  67                 keep='-k -k'
  68                 ;;
  69         --depth=*)
  70                 shallow_depth="--depth=`expr "z$1" : 'z-[^=]*=\(.*\)'`"
  71                 ;;
  72         --depth)
  73                 shift
  74                 shallow_depth="--depth=$1"
  75                 ;;
  76         -*)
  77                 usage
  78                 ;;
  79         *)
  80                 break
  81                 ;;
  82         esac
  83         shift
  84 done
  85
  86 case "$#" in
  87 0)
  88         origin=$(get_default_remote)
  89         test -n "$(get_remote_url ${origin})" ||
  90                 die "Where do you want to fetch from today?"
  91         set x $origin ; shift ;;
  92 esac
  93
  94 if test -z "$exec"
  95 then
  96         # No command line override and we have configuration for the remote.
  97         exec="--upload-pack=$(get_uploadpack $1)"
  98 fi
  99
 100 remote_nick="$1"
 101 remote=$(get_remote_url "$@")
 102 refs=
 103 rref=
 104 rsync_slurped_objects=
 105
 106 if test "" = "$append"
 107 then
 108         : >"$GIT_DIR/FETCH_HEAD"
 109 fi
 110
 111 # Global that is reused later
 112 ls_remote_result=$(git ls-remote $exec "$remote") ||
 113         die "Cannot get the repository state from $remote"
 114
 115 append_fetch_head () {
 116         flags=
 117         test -n "$verbose" && flags="$flags$LF-v"
 118         test -n "$force$single_force" && flags="$flags$LF-f"
 119         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION" \
 120                 git fetch--tool $flags append-fetch-head "$@"
 121 }
 122
 123 # updating the current HEAD with git-fetch in a bare
 124 # repository is always fine.
 125 if test -z "$update_head_ok" && test $(is_bare_repository) = false
 126 then
 127         orig_head=$(git rev-parse --verify HEAD 2>/dev/null)
 128 fi
 129
 130 # Allow --notags from remote.$1.tagopt
 131 case "$tags$no_tags" in
 132 '')
 133         case "$(git config --get "remote.$1.tagopt")" in
 134         --no-tags)
 135                 no_tags=t ;;
 136         esac
 137 esac
 138
 139 # If --tags (and later --heads or --all) is specified, then we are
 140 # not talking about defaults stored in Pull: line of remotes or
 141 # branches file, and just fetch those and refspecs explicitly given.
 142 # Otherwise we do what we always did.
 143
 144 reflist=$(get_remote_refs_for_fetch "$@")
 145 if test "$tags"
 146 then
 147         taglist=`IFS='  ' &&
 148                   echo "$ls_remote_result" |
 149                   git show-ref --exclude-existing=refs/tags/ |
 150                   while read sha1 name
 151                   do
 152                         echo ".${name}:${name}"
 153                   done` || exit
 154         if test "$#" -gt 1
 155         then
 156                 # remote URL plus explicit refspecs; we need to merge them.
 157                 reflist="$reflist$LF$taglist"
 158         else
 159                 # No explicit refspecs; fetch tags only.
 160                 reflist=$taglist
 161         fi
 162 fi
 163
 164 fetch_all_at_once () {
 165
 166   eval=$(echo "$1" | git fetch--tool parse-reflist "-")
 167   eval "$eval"
 168
 169     ( : subshell because we muck with IFS
 170       IFS="     $LF"
 171       (
 172         if test "$remote" = . ; then
 173             git show-ref $rref || echo failed "$remote"
 174         elif test -f "$remote" ; then
 175             test -n "$shallow_depth" &&
 176                 die "shallow clone with bundle is not supported"
 177             git bundle unbundle "$remote" $rref ||
 178             echo failed "$remote"
 179         else
 180                 if      test -d "$remote" &&
 181
 182                         # The remote might be our alternate.  With
 183                         # this optimization we will bypass fetch-pack
 184                         # altogether, which means we cannot be doing
 185                         # the shallow stuff at all.
 186                         test ! -f "$GIT_DIR/shallow" &&
 187                         test -z "$shallow_depth" &&
 188
 189                         # See if all of what we are going to fetch are
 190                         # connected to our repository's tips, in which
 191                         # case we do not have to do any fetch.
 192                         theirs=$(echo "$ls_remote_result" | \
 193                                 git fetch--tool -s pick-rref "$rref" "-") &&
 194
 195                         # This will barf when $theirs reach an object that
 196                         # we do not have in our repository.  Otherwise,
 197                         # we already have everything the fetch would bring in.
 198                         git rev-list --objects $theirs --not --all \
 199                                 >/dev/null 2>/dev/null
 200                 then
 201                         echo "$ls_remote_result" | \
 202                                 git fetch--tool pick-rref "$rref" "-"
 203                 else
 204                         flags=
 205                         case $verbose in
 206                         YesYes*)
 207                             flags="-v"
 208                             ;;
 209                         esac
 210                         git-fetch-pack --thin $exec $keep $shallow_depth \
 211                                 $quiet $no_progress $flags "$remote" $rref ||
 212                         echo failed "$remote"
 213                 fi
 214         fi
 215       ) |
 216       (
 217         flags=
 218         test -n "$verbose" && flags="$flags -v"
 219         test -n "$force" && flags="$flags -f"
 220         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION" \
 221                 git fetch--tool $flags native-store \
 222                         "$remote" "$remote_nick" "$refs"
 223       )
 224     ) || exit
 225
 226 }
 227
 228 fetch_per_ref () {
 229   reflist="$1"
 230   refs=
 231   rref=
 232
 233   for ref in $reflist
 234   do
 235       refs="$refs$LF$ref"
 236
 237       # These are relative path from $GIT_DIR, typically starting at refs/
 238       # but may be HEAD
 239       if expr "z$ref" : 'z\.' >/dev/null
 240       then
 241           not_for_merge=t
 242           ref=$(expr "z$ref" : 'z\.\(.*\)')
 243       else
 244           not_for_merge=
 245       fi
 246       if expr "z$ref" : 'z+' >/dev/null
 247       then
 248           single_force=t
 249           ref=$(expr "z$ref" : 'z+\(.*\)')
 250       else
 251           single_force=
 252       fi
 253       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
 254       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 255
 256       rref="$rref$LF$remote_name"
 257
 258       # There are transports that can fetch only one head at a time...
 259       case "$remote" in
 260       http://* | https://* | ftp://*)
 261           test -n "$shallow_depth" &&
 262                 die "shallow clone with http not supported"
 263           proto=`expr "$remote" : '\([^:]*\):'`
 264           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 265               curl_extra_args="-k"
 266           fi
 267           if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
 268                 "`git config --bool http.noEPSV`" = true ]; then
 269               noepsv_opt="--disable-epsv"
 270           fi
 271
 272           # Find $remote_name from ls-remote output.
 273           head=$(echo "$ls_remote_result" | \
 274                 git fetch--tool -s pick-rref "$remote_name" "-")
 275           expr "z$head" : "z$_x40\$" >/dev/null ||
 276                 die "No such ref $remote_name at $remote"
 277           echo >&2 "Fetching $remote_name from $remote using $proto"
 278           case "$quiet" in '') v=-v ;; *) v= ;; esac
 279           git-http-fetch $v -a "$head" "$remote" || exit
 280           ;;
 281       rsync://*)
 282           test -n "$shallow_depth" &&
 283                 die "shallow clone with rsync not supported"
 284           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 285           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 286           head=$(git rev-parse --verify TMP_HEAD)
 287           rm -f "$TMP_HEAD"
 288           case "$quiet" in '') v=-v ;; *) v= ;; esac
 289           test "$rsync_slurped_objects" || {
 290               rsync -a $v --ignore-existing --exclude info \
 291                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 292
 293               # Look at objects/info/alternates for rsync -- http will
 294               # support it natively and git native ones will do it on
 295               # the remote end.  Not having that file is not a crime.
 296               rsync -q "$remote/objects/info/alternates" \
 297                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 298                   rm -f "$GIT_DIR/TMP_ALT"
 299               if test -f "$GIT_DIR/TMP_ALT"
 300               then
 301                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 302                   while read alt
 303                   do
 304                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 305                       echo >&2 "Getting alternate: $alt"
 306                       rsync -av --ignore-existing --exclude info \
 307                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 308                   done
 309                   rm -f "$GIT_DIR/TMP_ALT"
 310               fi
 311               rsync_slurped_objects=t
 312           }
 313           ;;
 314       esac
 315
 316       append_fetch_head "$head" "$remote" \
 317           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge" || exit
 318
 319   done
 320
 321 }
 322
 323 fetch_main () {
 324         case "$remote" in
 325         http://* | https://* | ftp://* | rsync://* )
 326                 fetch_per_ref "$@"
 327                 ;;
 328         *)
 329                 fetch_all_at_once "$@"
 330                 ;;
 331         esac
 332 }
 333
 334 fetch_main "$reflist" || exit
 335
 336 # automated tag following
 337 case "$no_tags$tags" in
 338 '')
 339         case "$reflist" in
 340         *:refs/*)
 341                 # effective only when we are following remote branch
 342                 # using local tracking branch.
 343                 taglist=$(IFS=' ' &&
 344                 echo "$ls_remote_result" |
 345                 git show-ref --exclude-existing=refs/tags/ |
 346                 while read sha1 name
 347                 do
 348                         git cat-file -t "$sha1" >/dev/null 2>&1 || continue
 349                         echo >&2 "Auto-following $name"
 350                         echo ".${name}:${name}"
 351                 done)
 352         esac
 353         case "$taglist" in
 354         '') ;;
 355         ?*)
 356                 # do not deepen a shallow tree when following tags
 357                 shallow_depth=
 358                 fetch_main "$taglist" || exit ;;
 359         esac
 360 esac
 361
 362 # If the original head was empty (i.e. no "master" yet), or
 363 # if we were told not to worry, we do not have to check.
 364 case "$orig_head" in
 365 '')
 366         ;;
 367 ?*)
 368         curr_head=$(git rev-parse --verify HEAD 2>/dev/null)
 369         if test "$curr_head" != "$orig_head"
 370         then
 371             git update-ref \
 372                         -m "$GIT_REFLOG_ACTION: Undoing incorrectly fetched HEAD." \
 373                         HEAD "$orig_head"
 374                 die "Cannot fetch into the current branch."
 375         fi
 376         ;;
 377 esac