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 $*"
   8
   9 TOP=$(git-rev-parse --show-cdup)
  10 if test ! -z "$TOP"
  11 then
  12         cd "$TOP"
  13 fi
  14 . git-parse-remote
  15 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
  16 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
  17
  18 LF='
  19 '
  20 IFS="$LF"
  21
  22 no_tags=
  23 tags=
  24 append=
  25 force=
  26 verbose=
  27 update_head_ok=
  28 exec=
  29 upload_pack=
  30 keep=
  31 while case "$#" in 0) break ;; esac
  32 do
  33         case "$1" in
  34         -a|--a|--ap|--app|--appe|--appen|--append)
  35                 append=t
  36                 ;;
  37         --upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
  38         --upload-pa|--upload-pac|--upload-pack)
  39                 shift
  40                 exec="--exec=$1"
  41                 upload_pack="-u $1"
  42                 ;;
  43         -f|--f|--fo|--for|--forc|--force)
  44                 force=t
  45                 ;;
  46         -t|--t|--ta|--tag|--tags)
  47                 tags=t
  48                 ;;
  49         -n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
  50                 no_tags=t
  51                 ;;
  52         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
  53         --update-he|--update-hea|--update-head|--update-head-|\
  54         --update-head-o|--update-head-ok)
  55                 update_head_ok=t
  56                 ;;
  57         -v|--verbose)
  58                 verbose=Yes
  59                 ;;
  60         -k|--k|--ke|--kee|--keep)
  61                 keep='-k -k'
  62                 ;;
  63         -*)
  64                 usage
  65                 ;;
  66         *)
  67                 break
  68                 ;;
  69         esac
  70         shift
  71 done
  72
  73 case "$#" in
  74 0)
  75         origin=$(get_default_remote)
  76         test -n "$(get_remote_url ${origin})" ||
  77                 die "Where do you want to fetch from today?"
  78         set x $origin ; shift ;;
  79 esac
  80
  81 remote_nick="$1"
  82 remote=$(get_remote_url "$@")
  83 refs=
  84 rref=
  85 rsync_slurped_objects=
  86
  87 if test "" = "$append"
  88 then
  89         : >"$GIT_DIR/FETCH_HEAD"
  90 fi
  91
  92 # Global that is reused later
  93 ls_remote_result=$(git ls-remote $upload_pack "$remote") ||
  94         die "Cannot get the repository state from $remote"
  95
  96 append_fetch_head () {
  97     head_="$1"
  98     remote_="$2"
  99     remote_name_="$3"
 100     remote_nick_="$4"
 101     local_name_="$5"
 102     case "$6" in
 103     t) not_for_merge_='not-for-merge' ;;
 104     '') not_for_merge_= ;;
 105     esac
 106
 107     # remote-nick is the URL given on the command line (or a shorthand)
 108     # remote-name is the $GIT_DIR relative refs/ path we computed
 109     # for this refspec.
 110
 111     # the $note_ variable will be fed to git-fmt-merge-msg for further
 112     # processing.
 113     case "$remote_name_" in
 114     HEAD)
 115         note_= ;;
 116     refs/heads/*)
 117         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
 118         note_="branch '$note_' of " ;;
 119     refs/tags/*)
 120         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
 121         note_="tag '$note_' of " ;;
 122     refs/remotes/*)
 123         note_="$(expr "$remote_name_" : 'refs/remotes/\(.*\)')"
 124         note_="remote branch '$note_' of " ;;
 125     *)
 126         note_="$remote_name of " ;;
 127     esac
 128     remote_1_=$(expr "z$remote_" : 'z\(.*\)\.git/*$') &&
 129         remote_="$remote_1_"
 130     note_="$note_$remote_"
 131
 132     # 2.6.11-tree tag would not be happy to be fed to resolve.
 133     if git-cat-file commit "$head_" >/dev/null 2>&1
 134     then
 135         headc_=$(git-rev-parse --verify "$head_^0") || exit
 136         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
 137     else
 138         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
 139     fi
 140
 141     update_local_ref "$local_name_" "$head_" "$note_"
 142 }
 143
 144 update_local_ref () {
 145     # If we are storing the head locally make sure that it is
 146     # a fast forward (aka "reverse push").
 147
 148     label_=$(git-cat-file -t $2)
 149     newshort_=$(git-rev-parse --short $2)
 150     if test -z "$1" ; then
 151         [ "$verbose" ] && echo >&2 "* fetched $3"
 152         [ "$verbose" ] && echo >&2 "  $label_: $newshort_"
 153         return 0
 154     fi
 155     oldshort_=$(git show-ref --hash --abbrev "$1" 2>/dev/null)
 156
 157     case "$1" in
 158     refs/tags/*)
 159         # Tags need not be pointing at commits so there
 160         # is no way to guarantee "fast-forward" anyway.
 161         if test -n "$oldshort_"
 162         then
 163                 if now_=$(git show-ref --hash "$1") && test "$now_" = "$2"
 164                 then
 165                         [ "$verbose" ] && echo >&2 "* $1: same as $3"
 166                         [ "$verbose" ] && echo >&2 "  $label_: $newshort_" ||:
 167                 else
 168                         echo >&2 "* $1: updating with $3"
 169                         echo >&2 "  $label_: $newshort_"
 170                         git-update-ref -m "$GIT_REFLOG_ACTION: updating tag" "$1" "$2"
 171                 fi
 172         else
 173                 echo >&2 "* $1: storing $3"
 174                 echo >&2 "  $label_: $newshort_"
 175                 git-update-ref -m "$GIT_REFLOG_ACTION: storing tag" "$1" "$2"
 176         fi
 177         ;;
 178
 179     refs/heads/* | refs/remotes/*)
 180         # $1 is the ref being updated.
 181         # $2 is the new value for the ref.
 182         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
 183         if test "$local"
 184         then
 185             # Require fast-forward.
 186             mb=$(git-merge-base "$local" "$2") &&
 187             case "$2,$mb" in
 188             $local,*)
 189                 if test -n "$verbose"
 190                 then
 191                         echo >&2 "* $1: same as $3"
 192                         echo >&2 "  $label_: $newshort_"
 193                 fi
 194                 ;;
 195             *,$local)
 196                 echo >&2 "* $1: fast forward to $3"
 197                 echo >&2 "  old..new: $oldshort_..$newshort_"
 198                 git-update-ref -m "$GIT_REFLOG_ACTION: fast-forward" "$1" "$2" "$local"
 199                 ;;
 200             *)
 201                 false
 202                 ;;
 203             esac || {
 204                 case ",$force,$single_force," in
 205                 *,t,*)
 206                         echo >&2 "* $1: forcing update to non-fast forward $3"
 207                         echo >&2 "  old...new: $oldshort_...$newshort_"
 208                         git-update-ref -m "$GIT_REFLOG_ACTION: forced-update" "$1" "$2" "$local"
 209                         ;;
 210                 *)
 211                         echo >&2 "* $1: not updating to non-fast forward $3"
 212                         echo >&2 "  old...new: $oldshort_...$newshort_"
 213                         exit 1
 214                         ;;
 215                 esac
 216             }
 217         else
 218             echo >&2 "* $1: storing $3"
 219             echo >&2 "  $label_: $newshort_"
 220             git-update-ref -m "$GIT_REFLOG_ACTION: storing head" "$1" "$2"
 221         fi
 222         ;;
 223     esac
 224 }
 225
 226 case "$update_head_ok" in
 227 '')
 228         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 229         ;;
 230 esac
 231
 232 # If --tags (and later --heads or --all) is specified, then we are
 233 # not talking about defaults stored in Pull: line of remotes or
 234 # branches file, and just fetch those and refspecs explicitly given.
 235 # Otherwise we do what we always did.
 236
 237 reflist=$(get_remote_refs_for_fetch "$@")
 238 if test "$tags"
 239 then
 240         taglist=`IFS='  ' &&
 241                   echo "$ls_remote_result" |
 242                   while read sha1 name
 243                   do
 244                         case "$sha1" in
 245                         fail)
 246                                 exit 1
 247                         esac
 248                         case "$name" in
 249                         *^*) continue ;;
 250                         refs/tags/*) ;;
 251                         *) continue ;;
 252                         esac
 253                         if git-check-ref-format "$name"
 254                         then
 255                             echo ".${name}:${name}"
 256                         else
 257                             echo >&2 "warning: tag ${name} ignored"
 258                         fi
 259                   done` || exit
 260         if test "$#" -gt 1
 261         then
 262                 # remote URL plus explicit refspecs; we need to merge them.
 263                 reflist="$reflist$LF$taglist"
 264         else
 265                 # No explicit refspecs; fetch tags only.
 266                 reflist=$taglist
 267         fi
 268 fi
 269
 270 fetch_main () {
 271   reflist="$1"
 272   refs=
 273   rref=
 274
 275   for ref in $reflist
 276   do
 277       refs="$refs$LF$ref"
 278
 279       # These are relative path from $GIT_DIR, typically starting at refs/
 280       # but may be HEAD
 281       if expr "z$ref" : 'z\.' >/dev/null
 282       then
 283           not_for_merge=t
 284           ref=$(expr "z$ref" : 'z\.\(.*\)')
 285       else
 286           not_for_merge=
 287       fi
 288       if expr "z$ref" : 'z+' >/dev/null
 289       then
 290           single_force=t
 291           ref=$(expr "z$ref" : 'z+\(.*\)')
 292       else
 293           single_force=
 294       fi
 295       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
 296       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 297
 298       rref="$rref$LF$remote_name"
 299
 300       # There are transports that can fetch only one head at a time...
 301       case "$remote" in
 302       http://* | https://* | ftp://*)
 303           proto=`expr "$remote" : '\([^:]*\):'`
 304           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 305               curl_extra_args="-k"
 306           fi
 307           if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
 308                 "`git-repo-config --bool http.noEPSV`" = true ]; then
 309               noepsv_opt="--disable-epsv"
 310           fi
 311
 312           # Find $remote_name from ls-remote output.
 313           head=$(
 314                 IFS='   '
 315                 echo "$ls_remote_result" |
 316                 while read sha1 name
 317                 do
 318                         test "z$name" = "z$remote_name" || continue
 319                         echo "$sha1"
 320                         break
 321                 done
 322           )
 323           expr "z$head" : "z$_x40\$" >/dev/null ||
 324                 die "No such ref $remote_name at $remote"
 325           echo >&2 "Fetching $remote_name from $remote using $proto"
 326           git-http-fetch -v -a "$head" "$remote/" || exit
 327           ;;
 328       rsync://*)
 329           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 330           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 331           head=$(git-rev-parse --verify TMP_HEAD)
 332           rm -f "$TMP_HEAD"
 333           test "$rsync_slurped_objects" || {
 334               rsync -av --ignore-existing --exclude info \
 335                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 336
 337               # Look at objects/info/alternates for rsync -- http will
 338               # support it natively and git native ones will do it on
 339               # the remote end.  Not having that file is not a crime.
 340               rsync -q "$remote/objects/info/alternates" \
 341                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 342                   rm -f "$GIT_DIR/TMP_ALT"
 343               if test -f "$GIT_DIR/TMP_ALT"
 344               then
 345                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 346                   while read alt
 347                   do
 348                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 349                       echo >&2 "Getting alternate: $alt"
 350                       rsync -av --ignore-existing --exclude info \
 351                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 352                   done
 353                   rm -f "$GIT_DIR/TMP_ALT"
 354               fi
 355               rsync_slurped_objects=t
 356           }
 357           ;;
 358       *)
 359           # We will do git native transport with just one call later.
 360           continue ;;
 361       esac
 362
 363       append_fetch_head "$head" "$remote" \
 364           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge" || exit
 365
 366   done
 367
 368   case "$remote" in
 369   http://* | https://* | ftp://* | rsync://* )
 370       ;; # we are already done.
 371   *)
 372     ( : subshell because we muck with IFS
 373       pack_lockfile=
 374       IFS="     $LF"
 375       (
 376           git-fetch-pack --thin $exec $keep "$remote" $rref || echo failed "$remote"
 377       ) |
 378       while read sha1 remote_name
 379       do
 380           case "$sha1" in
 381           failed)
 382                   echo >&2 "Fetch failure: $remote"
 383                   exit 1 ;;
 384           # special line coming from index-pack with the pack name
 385           pack)
 386                   continue ;;
 387           keep)
 388                   pack_lockfile="$GIT_OBJECT_DIRECTORY/pack/pack-$remote_name.keep"
 389                   continue ;;
 390           esac
 391           found=
 392           single_force=
 393           for ref in $refs
 394           do
 395               case "$ref" in
 396               +$remote_name:*)
 397                   single_force=t
 398                   not_for_merge=
 399                   found="$ref"
 400                   break ;;
 401               .+$remote_name:*)
 402                   single_force=t
 403                   not_for_merge=t
 404                   found="$ref"
 405                   break ;;
 406               .$remote_name:*)
 407                   not_for_merge=t
 408                   found="$ref"
 409                   break ;;
 410               $remote_name:*)
 411                   not_for_merge=
 412                   found="$ref"
 413                   break ;;
 414               esac
 415           done
 416           local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
 417           append_fetch_head "$sha1" "$remote" \
 418                   "$remote_name" "$remote_nick" "$local_name" \
 419                   "$not_for_merge" || exit
 420       done &&
 421       if [ "$pack_lockfile" ]; then rm -f "$pack_lockfile"; fi
 422     ) || exit ;;
 423   esac
 424
 425 }
 426
 427 fetch_main "$reflist" || exit
 428
 429 # automated tag following
 430 case "$no_tags$tags" in
 431 '')
 432         case "$reflist" in
 433         *:refs/*)
 434                 # effective only when we are following remote branch
 435                 # using local tracking branch.
 436                 taglist=$(IFS=' ' &&
 437                 echo "$ls_remote_result" |
 438                 git-show-ref --exclude-existing=refs/tags/ |
 439                 while read sha1 name
 440                 do
 441                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 442                         echo >&2 "Auto-following $name"
 443                         echo ".${name}:${name}"
 444                 done)
 445         esac
 446         case "$taglist" in
 447         '') ;;
 448         ?*)
 449                 fetch_main "$taglist" || exit ;;
 450         esac
 451 esac
 452
 453 # If the original head was empty (i.e. no "master" yet), or
 454 # if we were told not to worry, we do not have to check.
 455 case "$orig_head" in
 456 '')
 457         ;;
 458 ?*)
 459         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 460         if test "$curr_head" != "$orig_head"
 461         then
 462             git-update-ref \
 463                         -m "$GIT_REFLOG_ACTION: Undoing incorrectly fetched HEAD." \
 464                         HEAD "$orig_head"
 465                 die "Cannot fetch into the current branch."
 466         fi
 467         ;;
 468 esac