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