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="$LF"
  21
  22 no_tags=
  23 tags=
  24 append=
  25 force=
  26 verbose=
  27 update_head_ok=
  28 exec=
  29 upload_pack=
  30 keep=
  31 shallow_depth=
  32 while case "$#" in 0) break ;; esac
  33 do
  34         case "$1" in
  35         -a|--a|--ap|--app|--appe|--appen|--append)
  36                 append=t
  37                 ;;
  38         --upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
  39         --upload-pa|--upload-pac|--upload-pack)
  40                 shift
  41                 exec="--exec=$1"
  42                 upload_pack="-u $1"
  43                 ;;
  44         -f|--f|--fo|--for|--forc|--force)
  45                 force=t
  46                 ;;
  47         -t|--t|--ta|--tag|--tags)
  48                 tags=t
  49                 ;;
  50         -n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
  51                 no_tags=t
  52                 ;;
  53         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
  54         --update-he|--update-hea|--update-head|--update-head-|\
  55         --update-head-o|--update-head-ok)
  56                 update_head_ok=t
  57                 ;;
  58         -v|--verbose)
  59                 verbose=Yes
  60                 ;;
  61         -k|--k|--ke|--kee|--keep)
  62                 keep='-k -k'
  63                 ;;
  64         --depth=*)
  65                 shallow_depth="--depth=`expr "z$1" : 'z-[^=]*=\(.*\)'`"
  66                 ;;
  67         --depth)
  68                 shift
  69                 shallow_depth="--depth=$1"
  70                 ;;
  71         -*)
  72                 usage
  73                 ;;
  74         *)
  75                 break
  76                 ;;
  77         esac
  78         shift
  79 done
  80
  81 case "$#" in
  82 0)
  83         origin=$(get_default_remote)
  84         test -n "$(get_remote_url ${origin})" ||
  85                 die "Where do you want to fetch from today?"
  86         set x $origin ; shift ;;
  87 esac
  88
  89 remote_nick="$1"
  90 remote=$(get_remote_url "$@")
  91 refs=
  92 rref=
  93 rsync_slurped_objects=
  94
  95 if test "" = "$append"
  96 then
  97         : >"$GIT_DIR/FETCH_HEAD"
  98 fi
  99
 100 # Global that is reused later
 101 ls_remote_result=$(git ls-remote $upload_pack "$remote") ||
 102         die "Cannot get the repository state from $remote"
 103
 104 append_fetch_head () {
 105     head_="$1"
 106     remote_="$2"
 107     remote_name_="$3"
 108     remote_nick_="$4"
 109     local_name_="$5"
 110     case "$6" in
 111     t) not_for_merge_='not-for-merge' ;;
 112     '') not_for_merge_= ;;
 113     esac
 114
 115     # remote-nick is the URL given on the command line (or a shorthand)
 116     # remote-name is the $GIT_DIR relative refs/ path we computed
 117     # for this refspec.
 118
 119     # the $note_ variable will be fed to git-fmt-merge-msg for further
 120     # processing.
 121     case "$remote_name_" in
 122     HEAD)
 123         note_= ;;
 124     refs/heads/*)
 125         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
 126         note_="branch '$note_' of " ;;
 127     refs/tags/*)
 128         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
 129         note_="tag '$note_' of " ;;
 130     refs/remotes/*)
 131         note_="$(expr "$remote_name_" : 'refs/remotes/\(.*\)')"
 132         note_="remote branch '$note_' of " ;;
 133     *)
 134         note_="$remote_name of " ;;
 135     esac
 136     remote_1_=$(expr "z$remote_" : 'z\(.*\)\.git/*$') &&
 137         remote_="$remote_1_"
 138     note_="$note_$remote_"
 139
 140     # 2.6.11-tree tag would not be happy to be fed to resolve.
 141     if git-cat-file commit "$head_" >/dev/null 2>&1
 142     then
 143         headc_=$(git-rev-parse --verify "$head_^0") || exit
 144         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
 145     else
 146         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
 147     fi
 148
 149     update_local_ref "$local_name_" "$head_" "$note_"
 150 }
 151
 152 update_local_ref () {
 153     # If we are storing the head locally make sure that it is
 154     # a fast forward (aka "reverse push").
 155
 156     label_=$(git-cat-file -t $2)
 157     newshort_=$(git-rev-parse --short $2)
 158     if test -z "$1" ; then
 159         [ "$verbose" ] && echo >&2 "* fetched $3"
 160         [ "$verbose" ] && echo >&2 "  $label_: $newshort_"
 161         return 0
 162     fi
 163     oldshort_=$(git show-ref --hash --abbrev "$1" 2>/dev/null)
 164
 165     case "$1" in
 166     refs/tags/*)
 167         # Tags need not be pointing at commits so there
 168         # is no way to guarantee "fast-forward" anyway.
 169         if test -n "$oldshort_"
 170         then
 171                 if now_=$(git show-ref --hash "$1") && test "$now_" = "$2"
 172                 then
 173                         [ "$verbose" ] && echo >&2 "* $1: same as $3"
 174                         [ "$verbose" ] && echo >&2 "  $label_: $newshort_" ||:
 175                 else
 176                         echo >&2 "* $1: updating with $3"
 177                         echo >&2 "  $label_: $newshort_"
 178                         git-update-ref -m "$GIT_REFLOG_ACTION: updating tag" "$1" "$2"
 179                 fi
 180         else
 181                 echo >&2 "* $1: storing $3"
 182                 echo >&2 "  $label_: $newshort_"
 183                 git-update-ref -m "$GIT_REFLOG_ACTION: storing tag" "$1" "$2"
 184         fi
 185         ;;
 186
 187     refs/heads/* | refs/remotes/*)
 188         # $1 is the ref being updated.
 189         # $2 is the new value for the ref.
 190         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
 191         if test "$local"
 192         then
 193             # Require fast-forward.
 194             mb=$(git-merge-base "$local" "$2") &&
 195             case "$2,$mb" in
 196             $local,*)
 197                 if test -n "$verbose"
 198                 then
 199                         echo >&2 "* $1: same as $3"
 200                         echo >&2 "  $label_: $newshort_"
 201                 fi
 202                 ;;
 203             *,$local)
 204                 echo >&2 "* $1: fast forward to $3"
 205                 echo >&2 "  old..new: $oldshort_..$newshort_"
 206                 git-update-ref -m "$GIT_REFLOG_ACTION: fast-forward" "$1" "$2" "$local"
 207                 ;;
 208             *)
 209                 false
 210                 ;;
 211             esac || {
 212                 case ",$force,$single_force," in
 213                 *,t,*)
 214                         echo >&2 "* $1: forcing update to non-fast forward $3"
 215                         echo >&2 "  old...new: $oldshort_...$newshort_"
 216                         git-update-ref -m "$GIT_REFLOG_ACTION: forced-update" "$1" "$2" "$local"
 217                         ;;
 218                 *)
 219                         echo >&2 "* $1: not updating to non-fast forward $3"
 220                         echo >&2 "  old...new: $oldshort_...$newshort_"
 221                         exit 1
 222                         ;;
 223                 esac
 224             }
 225         else
 226             echo >&2 "* $1: storing $3"
 227             echo >&2 "  $label_: $newshort_"
 228             git-update-ref -m "$GIT_REFLOG_ACTION: storing head" "$1" "$2"
 229         fi
 230         ;;
 231     esac
 232 }
 233
 234 # updating the current HEAD with git-fetch in a bare
 235 # repository is always fine.
 236 if test -z "$update_head_ok" && test $(is_bare_repository) = false
 237 then
 238         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 239 fi
 240
 241 # If --tags (and later --heads or --all) is specified, then we are
 242 # not talking about defaults stored in Pull: line of remotes or
 243 # branches file, and just fetch those and refspecs explicitly given.
 244 # Otherwise we do what we always did.
 245
 246 reflist=$(get_remote_refs_for_fetch "$@")
 247 if test "$tags"
 248 then
 249         taglist=`IFS='  ' &&
 250                   echo "$ls_remote_result" |
 251                   while read sha1 name
 252                   do
 253                         case "$sha1" in
 254                         fail)
 255                                 exit 1
 256                         esac
 257                         case "$name" in
 258                         *^*) continue ;;
 259                         refs/tags/*) ;;
 260                         *) continue ;;
 261                         esac
 262                         if git-check-ref-format "$name"
 263                         then
 264                             echo ".${name}:${name}"
 265                         else
 266                             echo >&2 "warning: tag ${name} ignored"
 267                         fi
 268                   done` || exit
 269         if test "$#" -gt 1
 270         then
 271                 # remote URL plus explicit refspecs; we need to merge them.
 272                 reflist="$reflist$LF$taglist"
 273         else
 274                 # No explicit refspecs; fetch tags only.
 275                 reflist=$taglist
 276         fi
 277 fi
 278
 279 fetch_main () {
 280   reflist="$1"
 281   refs=
 282   rref=
 283
 284   for ref in $reflist
 285   do
 286       refs="$refs$LF$ref"
 287
 288       # These are relative path from $GIT_DIR, typically starting at refs/
 289       # but may be HEAD
 290       if expr "z$ref" : 'z\.' >/dev/null
 291       then
 292           not_for_merge=t
 293           ref=$(expr "z$ref" : 'z\.\(.*\)')
 294       else
 295           not_for_merge=
 296       fi
 297       if expr "z$ref" : 'z+' >/dev/null
 298       then
 299           single_force=t
 300           ref=$(expr "z$ref" : 'z+\(.*\)')
 301       else
 302           single_force=
 303       fi
 304       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
 305       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 306
 307       rref="$rref$LF$remote_name"
 308
 309       # There are transports that can fetch only one head at a time...
 310       case "$remote" in
 311       http://* | https://* | ftp://*)
 312           test -n "$shallow_depth" &&
 313                 die "shallow clone with http not supported"
 314           proto=`expr "$remote" : '\([^:]*\):'`
 315           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 316               curl_extra_args="-k"
 317           fi
 318           if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
 319                 "`git-repo-config --bool http.noEPSV`" = true ]; then
 320               noepsv_opt="--disable-epsv"
 321           fi
 322
 323           # Find $remote_name from ls-remote output.
 324           head=$(
 325                 IFS='   '
 326                 echo "$ls_remote_result" |
 327                 while read sha1 name
 328                 do
 329                         test "z$name" = "z$remote_name" || continue
 330                         echo "$sha1"
 331                         break
 332                 done
 333           )
 334           expr "z$head" : "z$_x40\$" >/dev/null ||
 335                 die "No such ref $remote_name at $remote"
 336           echo >&2 "Fetching $remote_name from $remote using $proto"
 337           git-http-fetch -v -a "$head" "$remote/" || exit
 338           ;;
 339       rsync://*)
 340           test -n "$shallow_depth" &&
 341                 die "shallow clone with rsync not supported"
 342           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 343           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 344           head=$(git-rev-parse --verify TMP_HEAD)
 345           rm -f "$TMP_HEAD"
 346           test "$rsync_slurped_objects" || {
 347               rsync -av --ignore-existing --exclude info \
 348                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 349
 350               # Look at objects/info/alternates for rsync -- http will
 351               # support it natively and git native ones will do it on
 352               # the remote end.  Not having that file is not a crime.
 353               rsync -q "$remote/objects/info/alternates" \
 354                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 355                   rm -f "$GIT_DIR/TMP_ALT"
 356               if test -f "$GIT_DIR/TMP_ALT"
 357               then
 358                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 359                   while read alt
 360                   do
 361                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 362                       echo >&2 "Getting alternate: $alt"
 363                       rsync -av --ignore-existing --exclude info \
 364                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 365                   done
 366                   rm -f "$GIT_DIR/TMP_ALT"
 367               fi
 368               rsync_slurped_objects=t
 369           }
 370           ;;
 371       *)
 372           # We will do git native transport with just one call later.
 373           continue ;;
 374       esac
 375
 376       append_fetch_head "$head" "$remote" \
 377           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge" || exit
 378
 379   done
 380
 381   case "$remote" in
 382   http://* | https://* | ftp://* | rsync://* )
 383       ;; # we are already done.
 384   *)
 385     ( : subshell because we muck with IFS
 386       IFS="     $LF"
 387       (
 388           git-fetch-pack --thin $exec $keep $shallow_depth "$remote" $rref ||
 389           echo failed "$remote"
 390       ) |
 391       (
 392         trap '
 393                 if test -n "$keepfile" && test -f "$keepfile"
 394                 then
 395                         rm -f "$keepfile"
 396                 fi
 397         ' 0
 398
 399         keepfile=
 400         while read sha1 remote_name
 401         do
 402           case "$sha1" in
 403           failed)
 404                   echo >&2 "Fetch failure: $remote"
 405                   exit 1 ;;
 406           # special line coming from index-pack with the pack name
 407           pack)
 408                   continue ;;
 409           keep)
 410                   keepfile="$GIT_OBJECT_DIRECTORY/pack/pack-$remote_name.keep"
 411                   continue ;;
 412           esac
 413           found=
 414           single_force=
 415           for ref in $refs
 416           do
 417               case "$ref" in
 418               +$remote_name:*)
 419                   single_force=t
 420                   not_for_merge=
 421                   found="$ref"
 422                   break ;;
 423               .+$remote_name:*)
 424                   single_force=t
 425                   not_for_merge=t
 426                   found="$ref"
 427                   break ;;
 428               .$remote_name:*)
 429                   not_for_merge=t
 430                   found="$ref"
 431                   break ;;
 432               $remote_name:*)
 433                   not_for_merge=
 434                   found="$ref"
 435                   break ;;
 436               esac
 437           done
 438           local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
 439           append_fetch_head "$sha1" "$remote" \
 440                   "$remote_name" "$remote_nick" "$local_name" \
 441                   "$not_for_merge" || exit
 442         done
 443       )
 444     ) || exit ;;
 445   esac
 446
 447 }
 448
 449 fetch_main "$reflist" || exit
 450
 451 # automated tag following
 452 case "$no_tags$tags" in
 453 '')
 454         case "$reflist" in
 455         *:refs/*)
 456                 # effective only when we are following remote branch
 457                 # using local tracking branch.
 458                 taglist=$(IFS=' ' &&
 459                 echo "$ls_remote_result" |
 460                 git-show-ref --exclude-existing=refs/tags/ |
 461                 while read sha1 name
 462                 do
 463                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 464                         echo >&2 "Auto-following $name"
 465                         echo ".${name}:${name}"
 466                 done)
 467         esac
 468         case "$taglist" in
 469         '') ;;
 470         ?*)
 471                 # do not deepen a shallow tree when following tags
 472                 shallow_depth=
 473                 fetch_main "$taglist" || exit ;;
 474         esac
 475 esac
 476
 477 # If the original head was empty (i.e. no "master" yet), or
 478 # if we were told not to worry, we do not have to check.
 479 case "$orig_head" in
 480 '')
 481         ;;
 482 ?*)
 483         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 484         if test "$curr_head" != "$orig_head"
 485         then
 486             git-update-ref \
 487                         -m "$GIT_REFLOG_ACTION: Undoing incorrectly fetched HEAD." \
 488                         HEAD "$orig_head"
 489                 die "Cannot fetch into the current branch."
 490         fi
 491         ;;
 492 esac