git-fetch.sh

   1 #!/bin/sh
   2 #
   3
   4 USAGE='<fetch-options> <repository> <refspec>...'
   5 . git-sh-setup
   6 . git-parse-remote
   7 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
   8 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
   9
  10 LF='
  11 '
  12 IFS="$LF"
  13
  14 rloga=fetch
  15 no_tags=
  16 tags=
  17 append=
  18 force=
  19 verbose=
  20 update_head_ok=
  21 exec=
  22 upload_pack=
  23 keep=
  24 while case "$#" in 0) break ;; esac
  25 do
  26         case "$1" in
  27         -a|--a|--ap|--app|--appe|--appen|--append)
  28                 append=t
  29                 ;;
  30         --upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
  31         --upload-pa|--upload-pac|--upload-pack)
  32                 shift
  33                 exec="--exec=$1"
  34                 upload_pack="-u $1"
  35                 ;;
  36         -f|--f|--fo|--for|--forc|--force)
  37                 force=t
  38                 ;;
  39         -t|--t|--ta|--tag|--tags)
  40                 tags=t
  41                 ;;
  42         -n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
  43                 no_tags=t
  44                 ;;
  45         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
  46         --update-he|--update-hea|--update-head|--update-head-|\
  47         --update-head-o|--update-head-ok)
  48                 update_head_ok=t
  49                 ;;
  50         -v|--verbose)
  51                 verbose=Yes
  52                 ;;
  53         -k|--k|--ke|--kee|--keep)
  54                 keep='-k -k'
  55                 ;;
  56         --reflog-action=*)
  57                 rloga=`expr "z$1" : 'z-[^=]*=\(.*\)'`
  58                 ;;
  59         -*)
  60                 usage
  61                 ;;
  62         *)
  63                 break
  64                 ;;
  65         esac
  66         shift
  67 done
  68
  69 case "$#" in
  70 0)
  71         origin=$(get_default_remote)
  72         test -n "$(get_remote_url ${origin})" ||
  73                 die "Where do you want to fetch from today?"
  74         set x $origin ; shift ;;
  75 esac
  76
  77 remote_nick="$1"
  78 remote=$(get_remote_url "$@")
  79 refs=
  80 rref=
  81 rsync_slurped_objects=
  82
  83 rloga="$rloga $remote_nick"
  84 test "$remote_nick" = "$remote" || rloga="$rloga $remote"
  85
  86 if test "" = "$append"
  87 then
  88         : >"$GIT_DIR/FETCH_HEAD"
  89 fi
  90
  91 append_fetch_head () {
  92     head_="$1"
  93     remote_="$2"
  94     remote_name_="$3"
  95     remote_nick_="$4"
  96     local_name_="$5"
  97     case "$6" in
  98     t) not_for_merge_='not-for-merge' ;;
  99     '') not_for_merge_= ;;
 100     esac
 101
 102     # remote-nick is the URL given on the command line (or a shorthand)
 103     # remote-name is the $GIT_DIR relative refs/ path we computed
 104     # for this refspec.
 105
 106     # the $note_ variable will be fed to git-fmt-merge-msg for further
 107     # processing.
 108     case "$remote_name_" in
 109     HEAD)
 110         note_= ;;
 111     refs/heads/*)
 112         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
 113         note_="branch '$note_' of " ;;
 114     refs/tags/*)
 115         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
 116         note_="tag '$note_' of " ;;
 117     refs/remotes/*)
 118         note_="$(expr "$remote_name_" : 'refs/remotes/\(.*\)')"
 119         note_="remote branch '$note_' of " ;;
 120     *)
 121         note_="$remote_name of " ;;
 122     esac
 123     remote_1_=$(expr "z$remote_" : 'z\(.*\)\.git/*$') &&
 124         remote_="$remote_1_"
 125     note_="$note_$remote_"
 126
 127     # 2.6.11-tree tag would not be happy to be fed to resolve.
 128     if git-cat-file commit "$head_" >/dev/null 2>&1
 129     then
 130         headc_=$(git-rev-parse --verify "$head_^0") || exit
 131         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
 132     else
 133         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
 134     fi
 135
 136     update_local_ref "$local_name_" "$head_" "$note_"
 137 }
 138
 139 update_local_ref () {
 140     # If we are storing the head locally make sure that it is
 141     # a fast forward (aka "reverse push").
 142
 143     label_=$(git-cat-file -t $2)
 144     newshort_=$(git-rev-parse --short $2)
 145     if test -z "$1" ; then
 146         [ "$verbose" ] && echo >&2 "* fetched $3"
 147         [ "$verbose" ] && echo >&2 "  $label_: $newshort_"
 148         return 0
 149     fi
 150     oldshort_=$(git show-ref --hash --abbrev "$1" 2>/dev/null)
 151
 152     case "$1" in
 153     refs/tags/*)
 154         # Tags need not be pointing at commits so there
 155         # is no way to guarantee "fast-forward" anyway.
 156         if test -n "$oldshort_"
 157         then
 158                 if now_=$(git show-ref --hash "$1") && test "$now_" = "$2"
 159                 then
 160                         [ "$verbose" ] && echo >&2 "* $1: same as $3"
 161                         [ "$verbose" ] && echo >&2 "  $label_: $newshort_" ||:
 162                 else
 163                         echo >&2 "* $1: updating with $3"
 164                         echo >&2 "  $label_: $newshort_"
 165                         git-update-ref -m "$rloga: updating tag" "$1" "$2"
 166                 fi
 167         else
 168                 echo >&2 "* $1: storing $3"
 169                 echo >&2 "  $label_: $newshort_"
 170                 git-update-ref -m "$rloga: storing tag" "$1" "$2"
 171         fi
 172         ;;
 173
 174     refs/heads/* | refs/remotes/*)
 175         # $1 is the ref being updated.
 176         # $2 is the new value for the ref.
 177         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
 178         if test "$local"
 179         then
 180             # Require fast-forward.
 181             mb=$(git-merge-base "$local" "$2") &&
 182             case "$2,$mb" in
 183             $local,*)
 184                 if test -n "$verbose"
 185                 then
 186                         echo >&2 "* $1: same as $3"
 187                         echo >&2 "  $label_: $newshort_"
 188                 fi
 189                 ;;
 190             *,$local)
 191                 echo >&2 "* $1: fast forward to $3"
 192                 echo >&2 "  old..new: $oldshort_..$newshort_"
 193                 git-update-ref -m "$rloga: fast-forward" "$1" "$2" "$local"
 194                 ;;
 195             *)
 196                 false
 197                 ;;
 198             esac || {
 199                 case ",$force,$single_force," in
 200                 *,t,*)
 201                         echo >&2 "* $1: forcing update to non-fast forward $3"
 202                         echo >&2 "  old...new: $oldshort_...$newshort_"
 203                         git-update-ref -m "$rloga: forced-update" "$1" "$2" "$local"
 204                         ;;
 205                 *)
 206                         echo >&2 "* $1: not updating to non-fast forward $3"
 207                         echo >&2 "  old...new: $oldshort_...$newshort_"
 208                         exit 1
 209                         ;;
 210                 esac
 211             }
 212         else
 213             echo >&2 "* $1: storing $3"
 214             echo >&2 "  $label_: $newshort_"
 215             git-update-ref -m "$rloga: storing head" "$1" "$2"
 216         fi
 217         ;;
 218     esac
 219 }
 220
 221 case "$update_head_ok" in
 222 '')
 223         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 224         ;;
 225 esac
 226
 227 # If --tags (and later --heads or --all) is specified, then we are
 228 # not talking about defaults stored in Pull: line of remotes or
 229 # branches file, and just fetch those and refspecs explicitly given.
 230 # Otherwise we do what we always did.
 231
 232 reflist=$(get_remote_refs_for_fetch "$@")
 233 if test "$tags"
 234 then
 235         taglist=`IFS="  " &&
 236                   (
 237                         git-ls-remote $upload_pack --tags "$remote" ||
 238                         echo fail ouch
 239                   ) |
 240                   while read sha1 name
 241                   do
 242                         case "$sha1" in
 243                         fail)
 244                                 exit 1
 245                         esac
 246                         case "$name" in
 247                         *^*) continue ;;
 248                         esac
 249                         if git-check-ref-format "$name"
 250                         then
 251                             echo ".${name}:${name}"
 252                         else
 253                             echo >&2 "warning: tag ${name} ignored"
 254                         fi
 255                   done` || exit
 256         if test "$#" -gt 1
 257         then
 258                 # remote URL plus explicit refspecs; we need to merge them.
 259                 reflist="$reflist$LF$taglist"
 260         else
 261                 # No explicit refspecs; fetch tags only.
 262                 reflist=$taglist
 263         fi
 264 fi
 265
 266 fetch_main () {
 267   reflist="$1"
 268   refs=
 269   rref=
 270
 271   for ref in $reflist
 272   do
 273       refs="$refs$LF$ref"
 274
 275       # These are relative path from $GIT_DIR, typically starting at refs/
 276       # but may be HEAD
 277       if expr "z$ref" : 'z\.' >/dev/null
 278       then
 279           not_for_merge=t
 280           ref=$(expr "z$ref" : 'z\.\(.*\)')
 281       else
 282           not_for_merge=
 283       fi
 284       if expr "z$ref" : 'z+' >/dev/null
 285       then
 286           single_force=t
 287           ref=$(expr "z$ref" : 'z+\(.*\)')
 288       else
 289           single_force=
 290       fi
 291       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
 292       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 293
 294       rref="$rref$LF$remote_name"
 295
 296       # There are transports that can fetch only one head at a time...
 297       case "$remote" in
 298       http://* | https://* | ftp://*)
 299           proto=`expr "$remote" : '\([^:]*\):'`
 300           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 301               curl_extra_args="-k"
 302           fi
 303           if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
 304                 "`git-repo-config --bool http.noEPSV`" = true ]; then
 305               noepsv_opt="--disable-epsv"
 306           fi
 307           max_depth=5
 308           depth=0
 309           head="ref: $remote_name"
 310           while (expr "z$head" : "zref:" && expr $depth \< $max_depth) >/dev/null
 311           do
 312             remote_name_quoted=$(@@PERL@@ -e '
 313               my $u = $ARGV[0];
 314               $u =~ s/^ref:\s*//;
 315               $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
 316               print "$u";
 317           ' "$head")
 318             head=$(curl -nsfL $curl_extra_args $noepsv_opt "$remote/$remote_name_quoted")
 319             depth=$( expr \( $depth + 1 \) )
 320           done
 321           expr "z$head" : "z$_x40\$" >/dev/null ||
 322               die "Failed to fetch $remote_name from $remote"
 323           echo >&2 "Fetching $remote_name from $remote using $proto"
 324           git-http-fetch -v -a "$head" "$remote/" || exit
 325           ;;
 326       rsync://*)
 327           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 328           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 329           head=$(git-rev-parse --verify TMP_HEAD)
 330           rm -f "$TMP_HEAD"
 331           test "$rsync_slurped_objects" || {
 332               rsync -av --ignore-existing --exclude info \
 333                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 334
 335               # Look at objects/info/alternates for rsync -- http will
 336               # support it natively and git native ones will do it on
 337               # the remote end.  Not having that file is not a crime.
 338               rsync -q "$remote/objects/info/alternates" \
 339                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 340                   rm -f "$GIT_DIR/TMP_ALT"
 341               if test -f "$GIT_DIR/TMP_ALT"
 342               then
 343                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 344                   while read alt
 345                   do
 346                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 347                       echo >&2 "Getting alternate: $alt"
 348                       rsync -av --ignore-existing --exclude info \
 349                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 350                   done
 351                   rm -f "$GIT_DIR/TMP_ALT"
 352               fi
 353               rsync_slurped_objects=t
 354           }
 355           ;;
 356       *)
 357           # We will do git native transport with just one call later.
 358           continue ;;
 359       esac
 360
 361       append_fetch_head "$head" "$remote" \
 362           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 363
 364   done
 365
 366   case "$remote" in
 367   http://* | https://* | ftp://* | rsync://* )
 368       ;; # we are already done.
 369   *)
 370     ( : subshell because we muck with IFS
 371       pack_lockfile=
 372       IFS="     $LF"
 373       (
 374           git-fetch-pack --thin $exec $keep "$remote" $rref || echo failed "$remote"
 375       ) |
 376       while read sha1 remote_name
 377       do
 378           case "$sha1" in
 379           failed)
 380                   echo >&2 "Fetch failure: $remote"
 381                   exit 1 ;;
 382           # special line coming from index-pack with the pack name
 383           pack)
 384                   continue ;;
 385           keep)
 386                   pack_lockfile="$GIT_OBJECT_DIRECTORY/pack/pack-$remote_name.keep"
 387                   continue ;;
 388           esac
 389           found=
 390           single_force=
 391           for ref in $refs
 392           do
 393               case "$ref" in
 394               +$remote_name:*)
 395                   single_force=t
 396                   not_for_merge=
 397                   found="$ref"
 398                   break ;;
 399               .+$remote_name:*)
 400                   single_force=t
 401                   not_for_merge=t
 402                   found="$ref"
 403                   break ;;
 404               .$remote_name:*)
 405                   not_for_merge=t
 406                   found="$ref"
 407                   break ;;
 408               $remote_name:*)
 409                   not_for_merge=
 410                   found="$ref"
 411                   break ;;
 412               esac
 413           done
 414           local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
 415           append_fetch_head "$sha1" "$remote" \
 416                   "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 417       done
 418       if [ "$pack_lockfile" ]; then rm -f "$pack_lockfile"; fi
 419     ) || exit ;;
 420   esac
 421
 422 }
 423
 424 fetch_main "$reflist"
 425
 426 # automated tag following
 427 case "$no_tags$tags" in
 428 '')
 429         case "$reflist" in
 430         *:refs/*)
 431                 # effective only when we are following remote branch
 432                 # using local tracking branch.
 433                 taglist=$(IFS=" " &&
 434                 git-ls-remote $upload_pack --tags "$remote" |
 435                 sed -ne 's|^\([0-9a-f]*\)[      ]\(refs/tags/.*\)^{}$|\1 \2|p' |
 436                 while read sha1 name
 437                 do
 438                         git-show-ref --verify --quiet -- $name && continue
 439                         git-check-ref-format "$name" || {
 440                                 echo >&2 "warning: tag ${name} ignored"
 441                                 continue
 442                         }
 443                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 444                         echo >&2 "Auto-following $name"
 445                         echo ".${name}:${name}"
 446                 done)
 447         esac
 448         case "$taglist" in
 449         '') ;;
 450         ?*)
 451                 fetch_main "$taglist" ;;
 452         esac
 453 esac
 454
 455 # If the original head was empty (i.e. no "master" yet), or
 456 # if we were told not to worry, we do not have to check.
 457 case "$orig_head" in
 458 '')
 459         ;;
 460 ?*)
 461         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 462         if test "$curr_head" != "$orig_head"
 463         then
 464             git-update-ref \
 465                         -m "$rloga: Undoing incorrectly fetched HEAD." \
 466                         HEAD "$orig_head"
 467                 die "Cannot fetch into the current branch."
 468         fi
 469         ;;
 470 esac