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