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 while case "$#" in 0) break ;; esac
  28 do
  29         case "$1" in
  30         -a|--a|--ap|--app|--appe|--appen|--append)
  31                 append=t
  32                 ;;
  33         --upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
  34         --upload-pa|--upload-pac|--upload-pack)
  35                 shift
  36                 exec="--upload-pack=$1"
  37                 ;;
  38         --upl=*|--uplo=*|--uploa=*|--upload=*|\
  39         --upload-=*|--upload-p=*|--upload-pa=*|--upload-pac=*|--upload-pack=*)
  40                 exec=--upload-pack=$(expr "z$1" : 'z-[^=]*=\(.*\)')
  41                 shift
  42                 ;;
  43         -f|--f|--fo|--for|--forc|--force)
  44                 force=t
  45                 ;;
  46         -t|--t|--ta|--tag|--tags)
  47                 tags=t
  48                 ;;
  49         -n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
  50                 no_tags=t
  51                 ;;
  52         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
  53         --update-he|--update-hea|--update-head|--update-head-|\
  54         --update-head-o|--update-head-ok)
  55                 update_head_ok=t
  56                 ;;
  57         -v|--verbose)
  58                 verbose=Yes
  59                 ;;
  60         -k|--k|--ke|--kee|--keep)
  61                 keep='-k -k'
  62                 ;;
  63         --depth=*)
  64                 shallow_depth="--depth=`expr "z$1" : 'z-[^=]*=\(.*\)'`"
  65                 ;;
  66         --depth)
  67                 shift
  68                 shallow_depth="--depth=$1"
  69                 ;;
  70         -*)
  71                 usage
  72                 ;;
  73         *)
  74                 break
  75                 ;;
  76         esac
  77         shift
  78 done
  79
  80 case "$#" in
  81 0)
  82         origin=$(get_default_remote)
  83         test -n "$(get_remote_url ${origin})" ||
  84                 die "Where do you want to fetch from today?"
  85         set x $origin ; shift ;;
  86 esac
  87
  88 if test -z "$exec"
  89 then
  90         # No command line override and we have configuration for the remote.
  91         exec="--upload-pack=$(get_uploadpack $1)"
  92 fi
  93
  94 remote_nick="$1"
  95 remote=$(get_remote_url "$@")
  96 refs=
  97 rref=
  98 rsync_slurped_objects=
  99
 100 if test "" = "$append"
 101 then
 102         : >"$GIT_DIR/FETCH_HEAD"
 103 fi
 104
 105 # Global that is reused later
 106 ls_remote_result=$(git ls-remote $exec "$remote") ||
 107         die "Cannot get the repository state from $remote"
 108
 109 append_fetch_head () {
 110     head_="$1"
 111     remote_="$2"
 112     remote_name_="$3"
 113     remote_nick_="$4"
 114     local_name_="$5"
 115     case "$6" in
 116     t) not_for_merge_='not-for-merge' ;;
 117     '') not_for_merge_= ;;
 118     esac
 119
 120     # remote-nick is the URL given on the command line (or a shorthand)
 121     # remote-name is the $GIT_DIR relative refs/ path we computed
 122     # for this refspec.
 123
 124     # the $note_ variable will be fed to git-fmt-merge-msg for further
 125     # processing.
 126     case "$remote_name_" in
 127     HEAD)
 128         note_= ;;
 129     refs/heads/*)
 130         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
 131         note_="branch '$note_' of " ;;
 132     refs/tags/*)
 133         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
 134         note_="tag '$note_' of " ;;
 135     refs/remotes/*)
 136         note_="$(expr "$remote_name_" : 'refs/remotes/\(.*\)')"
 137         note_="remote branch '$note_' of " ;;
 138     *)
 139         note_="$remote_name of " ;;
 140     esac
 141     remote_1_=$(expr "z$remote_" : 'z\(.*\)\.git/*$') &&
 142         remote_="$remote_1_"
 143     note_="$note_$remote_"
 144
 145     # 2.6.11-tree tag would not be happy to be fed to resolve.
 146     if git-cat-file commit "$head_" >/dev/null 2>&1
 147     then
 148         headc_=$(git-rev-parse --verify "$head_^0") || exit
 149         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
 150     else
 151         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
 152     fi
 153
 154     update_local_ref "$local_name_" "$head_" "$note_"
 155 }
 156
 157 update_local_ref () {
 158     # If we are storing the head locally make sure that it is
 159     # a fast forward (aka "reverse push").
 160
 161     label_=$(git-cat-file -t $2)
 162     newshort_=$(git-rev-parse --short $2)
 163     if test -z "$1" ; then
 164         [ "$verbose" ] && echo >&2 "* fetched $3"
 165         [ "$verbose" ] && echo >&2 "  $label_: $newshort_"
 166         return 0
 167     fi
 168     oldshort_=$(git show-ref --hash --abbrev "$1" 2>/dev/null)
 169
 170     case "$1" in
 171     refs/tags/*)
 172         # Tags need not be pointing at commits so there
 173         # is no way to guarantee "fast-forward" anyway.
 174         if test -n "$oldshort_"
 175         then
 176                 if now_=$(git show-ref --hash "$1") && test "$now_" = "$2"
 177                 then
 178                         [ "$verbose" ] && echo >&2 "* $1: same as $3"
 179                         [ "$verbose" ] && echo >&2 "  $label_: $newshort_" ||:
 180                 else
 181                         echo >&2 "* $1: updating with $3"
 182                         echo >&2 "  $label_: $newshort_"
 183                         git-update-ref -m "$GIT_REFLOG_ACTION: updating tag" "$1" "$2"
 184                 fi
 185         else
 186                 echo >&2 "* $1: storing $3"
 187                 echo >&2 "  $label_: $newshort_"
 188                 git-update-ref -m "$GIT_REFLOG_ACTION: storing tag" "$1" "$2"
 189         fi
 190         ;;
 191
 192     refs/heads/* | refs/remotes/*)
 193         # $1 is the ref being updated.
 194         # $2 is the new value for the ref.
 195         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
 196         if test "$local"
 197         then
 198             # Require fast-forward.
 199             mb=$(git-merge-base "$local" "$2") &&
 200             case "$2,$mb" in
 201             $local,*)
 202                 if test -n "$verbose"
 203                 then
 204                         echo >&2 "* $1: same as $3"
 205                         echo >&2 "  $label_: $newshort_"
 206                 fi
 207                 ;;
 208             *,$local)
 209                 echo >&2 "* $1: fast forward to $3"
 210                 echo >&2 "  old..new: $oldshort_..$newshort_"
 211                 git-update-ref -m "$GIT_REFLOG_ACTION: fast-forward" "$1" "$2" "$local"
 212                 ;;
 213             *)
 214                 false
 215                 ;;
 216             esac || {
 217                 case ",$force,$single_force," in
 218                 *,t,*)
 219                         echo >&2 "* $1: forcing update to non-fast forward $3"
 220                         echo >&2 "  old...new: $oldshort_...$newshort_"
 221                         git-update-ref -m "$GIT_REFLOG_ACTION: forced-update" "$1" "$2" "$local"
 222                         ;;
 223                 *)
 224                         echo >&2 "* $1: not updating to non-fast forward $3"
 225                         echo >&2 "  old...new: $oldshort_...$newshort_"
 226                         exit 1
 227                         ;;
 228                 esac
 229             }
 230         else
 231             echo >&2 "* $1: storing $3"
 232             echo >&2 "  $label_: $newshort_"
 233             git-update-ref -m "$GIT_REFLOG_ACTION: storing head" "$1" "$2"
 234         fi
 235         ;;
 236     esac
 237 }
 238
 239 # updating the current HEAD with git-fetch in a bare
 240 # repository is always fine.
 241 if test -z "$update_head_ok" && test $(is_bare_repository) = false
 242 then
 243         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 244 fi
 245
 246 # If --tags (and later --heads or --all) is specified, then we are
 247 # not talking about defaults stored in Pull: line of remotes or
 248 # branches file, and just fetch those and refspecs explicitly given.
 249 # Otherwise we do what we always did.
 250
 251 reflist=$(get_remote_refs_for_fetch "$@")
 252 if test "$tags"
 253 then
 254         taglist=`IFS='  ' &&
 255                   echo "$ls_remote_result" |
 256                   git-show-ref --exclude-existing=refs/tags/ |
 257                   while read sha1 name
 258                   do
 259                         echo ".${name}:${name}"
 260                   done` || exit
 261         if test "$#" -gt 1
 262         then
 263                 # remote URL plus explicit refspecs; we need to merge them.
 264                 reflist="$reflist$LF$taglist"
 265         else
 266                 # No explicit refspecs; fetch tags only.
 267                 reflist=$taglist
 268         fi
 269 fi
 270
 271 fetch_main () {
 272   reflist="$1"
 273   refs=
 274   rref=
 275
 276   for ref in $reflist
 277   do
 278       refs="$refs$LF$ref"
 279
 280       # These are relative path from $GIT_DIR, typically starting at refs/
 281       # but may be HEAD
 282       if expr "z$ref" : 'z\.' >/dev/null
 283       then
 284           not_for_merge=t
 285           ref=$(expr "z$ref" : 'z\.\(.*\)')
 286       else
 287           not_for_merge=
 288       fi
 289       if expr "z$ref" : 'z+' >/dev/null
 290       then
 291           single_force=t
 292           ref=$(expr "z$ref" : 'z+\(.*\)')
 293       else
 294           single_force=
 295       fi
 296       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
 297       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 298
 299       rref="$rref$LF$remote_name"
 300
 301       # There are transports that can fetch only one head at a time...
 302       case "$remote" in
 303       http://* | https://* | ftp://*)
 304           test -n "$shallow_depth" &&
 305                 die "shallow clone with http not supported"
 306           proto=`expr "$remote" : '\([^:]*\):'`
 307           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 308               curl_extra_args="-k"
 309           fi
 310           if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
 311                 "`git-config --bool http.noEPSV`" = true ]; then
 312               noepsv_opt="--disable-epsv"
 313           fi
 314
 315           # Find $remote_name from ls-remote output.
 316           head=$(
 317                 IFS='   '
 318                 echo "$ls_remote_result" |
 319                 while read sha1 name
 320                 do
 321                         test "z$name" = "z$remote_name" || continue
 322                         echo "$sha1"
 323                         break
 324                 done
 325           )
 326           expr "z$head" : "z$_x40\$" >/dev/null ||
 327                 die "No such ref $remote_name at $remote"
 328           echo >&2 "Fetching $remote_name from $remote using $proto"
 329           git-http-fetch -v -a "$head" "$remote/" || exit
 330           ;;
 331       rsync://*)
 332           test -n "$shallow_depth" &&
 333                 die "shallow clone with rsync not supported"
 334           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 335           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 336           head=$(git-rev-parse --verify TMP_HEAD)
 337           rm -f "$TMP_HEAD"
 338           test "$rsync_slurped_objects" || {
 339               rsync -av --ignore-existing --exclude info \
 340                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 341
 342               # Look at objects/info/alternates for rsync -- http will
 343               # support it natively and git native ones will do it on
 344               # the remote end.  Not having that file is not a crime.
 345               rsync -q "$remote/objects/info/alternates" \
 346                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 347                   rm -f "$GIT_DIR/TMP_ALT"
 348               if test -f "$GIT_DIR/TMP_ALT"
 349               then
 350                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 351                   while read alt
 352                   do
 353                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 354                       echo >&2 "Getting alternate: $alt"
 355                       rsync -av --ignore-existing --exclude info \
 356                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 357                   done
 358                   rm -f "$GIT_DIR/TMP_ALT"
 359               fi
 360               rsync_slurped_objects=t
 361           }
 362           ;;
 363       *)
 364           # We will do git native transport with just one call later.
 365           continue ;;
 366       esac
 367
 368       append_fetch_head "$head" "$remote" \
 369           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge" || exit
 370
 371   done
 372
 373   case "$remote" in
 374   http://* | https://* | ftp://* | rsync://* )
 375       ;; # we are already done.
 376   *)
 377     ( : subshell because we muck with IFS
 378       IFS="     $LF"
 379       (
 380           git-fetch-pack --thin $exec $keep $shallow_depth "$remote" $rref ||
 381           echo failed "$remote"
 382       ) |
 383       (
 384         trap '
 385                 if test -n "$keepfile" && test -f "$keepfile"
 386                 then
 387                         rm -f "$keepfile"
 388                 fi
 389         ' 0
 390
 391         keepfile=
 392         while read sha1 remote_name
 393         do
 394           case "$sha1" in
 395           failed)
 396                   echo >&2 "Fetch failure: $remote"
 397                   exit 1 ;;
 398           # special line coming from index-pack with the pack name
 399           pack)
 400                   continue ;;
 401           keep)
 402                   keepfile="$GIT_OBJECT_DIRECTORY/pack/pack-$remote_name.keep"
 403                   continue ;;
 404           esac
 405           found=
 406           single_force=
 407           for ref in $refs
 408           do
 409               case "$ref" in
 410               +$remote_name:*)
 411                   single_force=t
 412                   not_for_merge=
 413                   found="$ref"
 414                   break ;;
 415               .+$remote_name:*)
 416                   single_force=t
 417                   not_for_merge=t
 418                   found="$ref"
 419                   break ;;
 420               .$remote_name:*)
 421                   not_for_merge=t
 422                   found="$ref"
 423                   break ;;
 424               $remote_name:*)
 425                   not_for_merge=
 426                   found="$ref"
 427                   break ;;
 428               esac
 429           done
 430           local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
 431           append_fetch_head "$sha1" "$remote" \
 432                   "$remote_name" "$remote_nick" "$local_name" \
 433                   "$not_for_merge" || exit
 434         done
 435       )
 436     ) || exit ;;
 437   esac
 438
 439 }
 440
 441 fetch_main "$reflist" || exit
 442
 443 # automated tag following
 444 case "$no_tags$tags" in
 445 '')
 446         case "$reflist" in
 447         *:refs/*)
 448                 # effective only when we are following remote branch
 449                 # using local tracking branch.
 450                 taglist=$(IFS=' ' &&
 451                 echo "$ls_remote_result" |
 452                 git-show-ref --exclude-existing=refs/tags/ |
 453                 while read sha1 name
 454                 do
 455                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 456                         echo >&2 "Auto-following $name"
 457                         echo ".${name}:${name}"
 458                 done)
 459         esac
 460         case "$taglist" in
 461         '') ;;
 462         ?*)
 463                 # do not deepen a shallow tree when following tags
 464                 shallow_depth=
 465                 fetch_main "$taglist" || exit ;;
 466         esac
 467 esac
 468
 469 # If the original head was empty (i.e. no "master" yet), or
 470 # if we were told not to worry, we do not have to check.
 471 case "$orig_head" in
 472 '')
 473         ;;
 474 ?*)
 475         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 476         if test "$curr_head" != "$orig_head"
 477         then
 478             git-update-ref \
 479                         -m "$GIT_REFLOG_ACTION: Undoing incorrectly fetched HEAD." \
 480                         HEAD "$orig_head"
 481                 die "Cannot fetch into the current branch."
 482         fi
 483         ;;
 484 esac