git-fetch.sh

   1 #!/bin/sh
   2 #
   3
   4 USAGE='<fetch-options> <repository> <refspec>...'
   5 SUBDIRECTORY_OK=Yes
   6 . git-sh-setup
   7 TOP=$(git-rev-parse --show-cdup)
   8 if test ! -z "$TOP"
   9 then
  10         cd "$TOP"
  11 fi
  12 . git-parse-remote
  13 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
  14 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
  15
  16 LF='
  17 '
  18 IFS="$LF"
  19
  20 rloga=fetch
  21 no_tags=
  22 tags=
  23 append=
  24 force=
  25 verbose=
  26 update_head_ok=
  27 exec=
  28 upload_pack=
  29 keep=
  30 shallow_depth=
  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         --reflog-action=*)
  64                 rloga=`expr "z$1" : 'z-[^=]*=\(.*\)'`
  65                 ;;
  66         --depth=*)
  67                 shallow_depth="--depth=`expr "z$1" : 'z-[^=]*=\(.*\)'`"
  68                 ;;
  69         --depth)
  70                 shift
  71                 shallow_depth="--depth=$1"
  72                 ;;
  73         -*)
  74                 usage
  75                 ;;
  76         *)
  77                 break
  78                 ;;
  79         esac
  80         shift
  81 done
  82
  83 case "$#" in
  84 0)
  85         origin=$(get_default_remote)
  86         test -n "$(get_remote_url ${origin})" ||
  87                 die "Where do you want to fetch from today?"
  88         set x $origin ; shift ;;
  89 esac
  90
  91 remote_nick="$1"
  92 remote=$(get_remote_url "$@")
  93 refs=
  94 rref=
  95 rsync_slurped_objects=
  96
  97 rloga="$rloga $remote_nick"
  98 test "$remote_nick" = "$remote" || rloga="$rloga $remote"
  99
 100 if test "" = "$append"
 101 then
 102         : >"$GIT_DIR/FETCH_HEAD"
 103 fi
 104
 105 # Global that is reused later
 106 ls_remote_result=$(git ls-remote $upload_pack "$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_: $newshort_"
 183                         git-update-ref -m "$rloga: updating tag" "$1" "$2"
 184                 fi
 185         else
 186                 echo >&2 "* $1: storing $3"
 187                 echo >&2 "  $label_: $newshort_"
 188                 git-update-ref -m "$rloga: 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 "$rloga: 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 "$rloga: 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_: $newshort_"
 233             git-update-ref -m "$rloga: storing head" "$1" "$2"
 234         fi
 235         ;;
 236     esac
 237 }
 238
 239 case "$update_head_ok" in
 240 '')
 241         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 242         ;;
 243 esac
 244
 245 # If --tags (and later --heads or --all) is specified, then we are
 246 # not talking about defaults stored in Pull: line of remotes or
 247 # branches file, and just fetch those and refspecs explicitly given.
 248 # Otherwise we do what we always did.
 249
 250 reflist=$(get_remote_refs_for_fetch "$@")
 251 if test "$tags"
 252 then
 253         taglist=`IFS='  ' &&
 254                   echo "$ls_remote_result" |
 255                   while read sha1 name
 256                   do
 257                         case "$sha1" in
 258                         fail)
 259                                 exit 1
 260                         esac
 261                         case "$name" in
 262                         *^*) continue ;;
 263                         refs/tags/*) ;;
 264                         *) continue ;;
 265                         esac
 266                         if git-check-ref-format "$name"
 267                         then
 268                             echo ".${name}:${name}"
 269                         else
 270                             echo >&2 "warning: tag ${name} ignored"
 271                         fi
 272                   done` || exit
 273         if test "$#" -gt 1
 274         then
 275                 # remote URL plus explicit refspecs; we need to merge them.
 276                 reflist="$reflist$LF$taglist"
 277         else
 278                 # No explicit refspecs; fetch tags only.
 279                 reflist=$taglist
 280         fi
 281 fi
 282
 283 fetch_main () {
 284   reflist="$1"
 285   refs=
 286   rref=
 287
 288   for ref in $reflist
 289   do
 290       refs="$refs$LF$ref"
 291
 292       # These are relative path from $GIT_DIR, typically starting at refs/
 293       # but may be HEAD
 294       if expr "z$ref" : 'z\.' >/dev/null
 295       then
 296           not_for_merge=t
 297           ref=$(expr "z$ref" : 'z\.\(.*\)')
 298       else
 299           not_for_merge=
 300       fi
 301       if expr "z$ref" : 'z+' >/dev/null
 302       then
 303           single_force=t
 304           ref=$(expr "z$ref" : 'z+\(.*\)')
 305       else
 306           single_force=
 307       fi
 308       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
 309       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 310
 311       rref="$rref$LF$remote_name"
 312
 313       # There are transports that can fetch only one head at a time...
 314       case "$remote" in
 315       http://* | https://* | ftp://*)
 316           test -n "$shallow_depth" &&
 317                 die "shallow clone with http not supported"
 318           proto=`expr "$remote" : '\([^:]*\):'`
 319           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 320               curl_extra_args="-k"
 321           fi
 322           if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
 323                 "`git-repo-config --bool http.noEPSV`" = true ]; then
 324               noepsv_opt="--disable-epsv"
 325           fi
 326
 327           # Find $remote_name from ls-remote output.
 328           head=$(
 329                 IFS='   '
 330                 echo "$ls_remote_result" |
 331                 while read sha1 name
 332                 do
 333                         test "z$name" = "z$remote_name" || continue
 334                         echo "$sha1"
 335                         break
 336                 done
 337           )
 338           expr "z$head" : "z$_x40\$" >/dev/null ||
 339                 die "No such ref $remote_name at $remote"
 340           echo >&2 "Fetching $remote_name from $remote using $proto"
 341           git-http-fetch -v -a "$head" "$remote/" || exit
 342           ;;
 343       rsync://*)
 344           test -n "$shallow_depth" &&
 345                 die "shallow clone with rsync not supported"
 346           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 347           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 348           head=$(git-rev-parse --verify TMP_HEAD)
 349           rm -f "$TMP_HEAD"
 350           test "$rsync_slurped_objects" || {
 351               rsync -av --ignore-existing --exclude info \
 352                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 353
 354               # Look at objects/info/alternates for rsync -- http will
 355               # support it natively and git native ones will do it on
 356               # the remote end.  Not having that file is not a crime.
 357               rsync -q "$remote/objects/info/alternates" \
 358                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 359                   rm -f "$GIT_DIR/TMP_ALT"
 360               if test -f "$GIT_DIR/TMP_ALT"
 361               then
 362                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 363                   while read alt
 364                   do
 365                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 366                       echo >&2 "Getting alternate: $alt"
 367                       rsync -av --ignore-existing --exclude info \
 368                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 369                   done
 370                   rm -f "$GIT_DIR/TMP_ALT"
 371               fi
 372               rsync_slurped_objects=t
 373           }
 374           ;;
 375       *)
 376           # We will do git native transport with just one call later.
 377           continue ;;
 378       esac
 379
 380       append_fetch_head "$head" "$remote" \
 381           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge" || exit
 382
 383   done
 384
 385   case "$remote" in
 386   http://* | https://* | ftp://* | rsync://* )
 387       ;; # we are already done.
 388   *)
 389     ( : subshell because we muck with IFS
 390       pack_lockfile=
 391       IFS="     $LF"
 392       (
 393           git-fetch-pack --thin $exec $keep $shallow_depth "$remote" $rref || echo failed "$remote"
 394       ) |
 395       while read sha1 remote_name
 396       do
 397           case "$sha1" in
 398           failed)
 399                   echo >&2 "Fetch failure: $remote"
 400                   exit 1 ;;
 401           # special line coming from index-pack with the pack name
 402           pack)
 403                   continue ;;
 404           keep)
 405                   pack_lockfile="$GIT_OBJECT_DIRECTORY/pack/pack-$remote_name.keep"
 406                   continue ;;
 407           esac
 408           found=
 409           single_force=
 410           for ref in $refs
 411           do
 412               case "$ref" in
 413               +$remote_name:*)
 414                   single_force=t
 415                   not_for_merge=
 416                   found="$ref"
 417                   break ;;
 418               .+$remote_name:*)
 419                   single_force=t
 420                   not_for_merge=t
 421                   found="$ref"
 422                   break ;;
 423               .$remote_name:*)
 424                   not_for_merge=t
 425                   found="$ref"
 426                   break ;;
 427               $remote_name:*)
 428                   not_for_merge=
 429                   found="$ref"
 430                   break ;;
 431               esac
 432           done
 433           local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
 434           append_fetch_head "$sha1" "$remote" \
 435                   "$remote_name" "$remote_nick" "$local_name" \
 436                   "$not_for_merge" || exit
 437       done &&
 438       if [ "$pack_lockfile" ]; then rm -f "$pack_lockfile"; fi
 439     ) || exit ;;
 440   esac
 441
 442 }
 443
 444 fetch_main "$reflist" || exit
 445
 446 # automated tag following
 447 case "$no_tags$tags" in
 448 '')
 449         case "$reflist" in
 450         *:refs/*)
 451                 # effective only when we are following remote branch
 452                 # using local tracking branch.
 453                 taglist=$(IFS=' ' &&
 454                 echo "$ls_remote_result" |
 455                 git-show-ref --exclude-existing=refs/tags/ |
 456                 while read sha1 name
 457                 do
 458                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 459                         echo >&2 "Auto-following $name"
 460                         echo ".${name}:${name}"
 461                 done)
 462         esac
 463         case "$taglist" in
 464         '') ;;
 465         ?*)
 466                 # do not deepen a shallow tree when following tags
 467                 shallow_depth=
 468                 fetch_main "$taglist" || exit ;;
 469         esac
 470 esac
 471
 472 # If the original head was empty (i.e. no "master" yet), or
 473 # if we were told not to worry, we do not have to check.
 474 case "$orig_head" in
 475 '')
 476         ;;
 477 ?*)
 478         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 479         if test "$curr_head" != "$orig_head"
 480         then
 481             git-update-ref \
 482                         -m "$rloga: Undoing incorrectly fetched HEAD." \
 483                         HEAD "$orig_head"
 484                 die "Cannot fetch into the current branch."
 485         fi
 486         ;;
 487 esac