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 $*"
   8 cd_to_toplevel ;# probably unnecessary...
   9
  10 . git-parse-remote
  11 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
  12 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
  13
  14 LF='
  15 '
  16 IFS="$LF"
  17
  18 no_tags=
  19 tags=
  20 append=
  21 force=
  22 verbose=
  23 update_head_ok=
  24 exec=
  25 keep=
  26 shallow_depth=
  27 while case "$#" in 0) break ;; esac
  28 do
  29         case "$1" in
  30         -a|--a|--ap|--app|--appe|--appen|--append)
  31                 append=t
  32                 ;;
  33         --upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
  34         --upload-pa|--upload-pac|--upload-pack)
  35                 shift
  36                 exec="--upload-pack=$1"
  37                 ;;
  38         --upl=*|--uplo=*|--uploa=*|--upload=*|\
  39         --upload-=*|--upload-p=*|--upload-pa=*|--upload-pac=*|--upload-pack=*)
  40                 exec=--upload-pack=$(expr "$1" : '-[^=]*=\(.*\)')
  41                 shift
  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         --depth=*)
  64                 shallow_depth="--depth=`expr "z$1" : 'z-[^=]*=\(.*\)'`"
  65                 ;;
  66         --depth)
  67                 shift
  68                 shallow_depth="--depth=$1"
  69                 ;;
  70         -*)
  71                 usage
  72                 ;;
  73         *)
  74                 break
  75                 ;;
  76         esac
  77         shift
  78 done
  79
  80 case "$#" in
  81 0)
  82         origin=$(get_default_remote)
  83         test -n "$(get_remote_url ${origin})" ||
  84                 die "Where do you want to fetch from today?"
  85         set x $origin ; shift ;;
  86 esac
  87
  88 remote_nick="$1"
  89 remote=$(get_remote_url "$@")
  90 refs=
  91 rref=
  92 rsync_slurped_objects=
  93
  94 if test "" = "$append"
  95 then
  96         : >"$GIT_DIR/FETCH_HEAD"
  97 fi
  98
  99 # Global that is reused later
 100 ls_remote_result=$(git ls-remote $exec "$remote") ||
 101         die "Cannot get the repository state from $remote"
 102
 103 append_fetch_head () {
 104     head_="$1"
 105     remote_="$2"
 106     remote_name_="$3"
 107     remote_nick_="$4"
 108     local_name_="$5"
 109     case "$6" in
 110     t) not_for_merge_='not-for-merge' ;;
 111     '') not_for_merge_= ;;
 112     esac
 113
 114     # remote-nick is the URL given on the command line (or a shorthand)
 115     # remote-name is the $GIT_DIR relative refs/ path we computed
 116     # for this refspec.
 117
 118     # the $note_ variable will be fed to git-fmt-merge-msg for further
 119     # processing.
 120     case "$remote_name_" in
 121     HEAD)
 122         note_= ;;
 123     refs/heads/*)
 124         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
 125         note_="branch '$note_' of " ;;
 126     refs/tags/*)
 127         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
 128         note_="tag '$note_' of " ;;
 129     refs/remotes/*)
 130         note_="$(expr "$remote_name_" : 'refs/remotes/\(.*\)')"
 131         note_="remote branch '$note_' of " ;;
 132     *)
 133         note_="$remote_name of " ;;
 134     esac
 135     remote_1_=$(expr "z$remote_" : 'z\(.*\)\.git/*$') &&
 136         remote_="$remote_1_"
 137     note_="$note_$remote_"
 138
 139     # 2.6.11-tree tag would not be happy to be fed to resolve.
 140     if git-cat-file commit "$head_" >/dev/null 2>&1
 141     then
 142         headc_=$(git-rev-parse --verify "$head_^0") || exit
 143         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
 144     else
 145         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
 146     fi
 147
 148     update_local_ref "$local_name_" "$head_" "$note_"
 149 }
 150
 151 update_local_ref () {
 152     # If we are storing the head locally make sure that it is
 153     # a fast forward (aka "reverse push").
 154
 155     label_=$(git-cat-file -t $2)
 156     newshort_=$(git-rev-parse --short $2)
 157     if test -z "$1" ; then
 158         [ "$verbose" ] && echo >&2 "* fetched $3"
 159         [ "$verbose" ] && echo >&2 "  $label_: $newshort_"
 160         return 0
 161     fi
 162     oldshort_=$(git show-ref --hash --abbrev "$1" 2>/dev/null)
 163
 164     case "$1" in
 165     refs/tags/*)
 166         # Tags need not be pointing at commits so there
 167         # is no way to guarantee "fast-forward" anyway.
 168         if test -n "$oldshort_"
 169         then
 170                 if now_=$(git show-ref --hash "$1") && test "$now_" = "$2"
 171                 then
 172                         [ "$verbose" ] && echo >&2 "* $1: same as $3"
 173                         [ "$verbose" ] && echo >&2 "  $label_: $newshort_" ||:
 174                 else
 175                         echo >&2 "* $1: updating with $3"
 176                         echo >&2 "  $label_: $newshort_"
 177                         git-update-ref -m "$GIT_REFLOG_ACTION: updating tag" "$1" "$2"
 178                 fi
 179         else
 180                 echo >&2 "* $1: storing $3"
 181                 echo >&2 "  $label_: $newshort_"
 182                 git-update-ref -m "$GIT_REFLOG_ACTION: storing tag" "$1" "$2"
 183         fi
 184         ;;
 185
 186     refs/heads/* | refs/remotes/*)
 187         # $1 is the ref being updated.
 188         # $2 is the new value for the ref.
 189         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
 190         if test "$local"
 191         then
 192             # Require fast-forward.
 193             mb=$(git-merge-base "$local" "$2") &&
 194             case "$2,$mb" in
 195             $local,*)
 196                 if test -n "$verbose"
 197                 then
 198                         echo >&2 "* $1: same as $3"
 199                         echo >&2 "  $label_: $newshort_"
 200                 fi
 201                 ;;
 202             *,$local)
 203                 echo >&2 "* $1: fast forward to $3"
 204                 echo >&2 "  old..new: $oldshort_..$newshort_"
 205                 git-update-ref -m "$GIT_REFLOG_ACTION: fast-forward" "$1" "$2" "$local"
 206                 ;;
 207             *)
 208                 false
 209                 ;;
 210             esac || {
 211                 case ",$force,$single_force," in
 212                 *,t,*)
 213                         echo >&2 "* $1: forcing update to non-fast forward $3"
 214                         echo >&2 "  old...new: $oldshort_...$newshort_"
 215                         git-update-ref -m "$GIT_REFLOG_ACTION: forced-update" "$1" "$2" "$local"
 216                         ;;
 217                 *)
 218                         echo >&2 "* $1: not updating to non-fast forward $3"
 219                         echo >&2 "  old...new: $oldshort_...$newshort_"
 220                         exit 1
 221                         ;;
 222                 esac
 223             }
 224         else
 225             echo >&2 "* $1: storing $3"
 226             echo >&2 "  $label_: $newshort_"
 227             git-update-ref -m "$GIT_REFLOG_ACTION: storing head" "$1" "$2"
 228         fi
 229         ;;
 230     esac
 231 }
 232
 233 # updating the current HEAD with git-fetch in a bare
 234 # repository is always fine.
 235 if test -z "$update_head_ok" && test $(is_bare_repository) = false
 236 then
 237         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 238 fi
 239
 240 # If --tags (and later --heads or --all) is specified, then we are
 241 # not talking about defaults stored in Pull: line of remotes or
 242 # branches file, and just fetch those and refspecs explicitly given.
 243 # Otherwise we do what we always did.
 244
 245 reflist=$(get_remote_refs_for_fetch "$@")
 246 if test "$tags"
 247 then
 248         taglist=`IFS='  ' &&
 249                   echo "$ls_remote_result" |
 250                   while read sha1 name
 251                   do
 252                         case "$sha1" in
 253                         fail)
 254                                 exit 1
 255                         esac
 256                         case "$name" in
 257                         *^*) continue ;;
 258                         refs/tags/*) ;;
 259                         *) continue ;;
 260                         esac
 261                         if git-check-ref-format "$name"
 262                         then
 263                             echo ".${name}:${name}"
 264                         else
 265                             echo >&2 "warning: tag ${name} ignored"
 266                         fi
 267                   done` || exit
 268         if test "$#" -gt 1
 269         then
 270                 # remote URL plus explicit refspecs; we need to merge them.
 271                 reflist="$reflist$LF$taglist"
 272         else
 273                 # No explicit refspecs; fetch tags only.
 274                 reflist=$taglist
 275         fi
 276 fi
 277
 278 fetch_main () {
 279   reflist="$1"
 280   refs=
 281   rref=
 282
 283   for ref in $reflist
 284   do
 285       refs="$refs$LF$ref"
 286
 287       # These are relative path from $GIT_DIR, typically starting at refs/
 288       # but may be HEAD
 289       if expr "z$ref" : 'z\.' >/dev/null
 290       then
 291           not_for_merge=t
 292           ref=$(expr "z$ref" : 'z\.\(.*\)')
 293       else
 294           not_for_merge=
 295       fi
 296       if expr "z$ref" : 'z+' >/dev/null
 297       then
 298           single_force=t
 299           ref=$(expr "z$ref" : 'z+\(.*\)')
 300       else
 301           single_force=
 302       fi
 303       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
 304       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 305
 306       rref="$rref$LF$remote_name"
 307
 308       # There are transports that can fetch only one head at a time...
 309       case "$remote" in
 310       http://* | https://* | ftp://*)
 311           test -n "$shallow_depth" &&
 312                 die "shallow clone with http not supported"
 313           proto=`expr "$remote" : '\([^:]*\):'`
 314           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 315               curl_extra_args="-k"
 316           fi
 317           if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
 318                 "`git-repo-config --bool http.noEPSV`" = true ]; then
 319               noepsv_opt="--disable-epsv"
 320           fi
 321
 322           # Find $remote_name from ls-remote output.
 323           head=$(
 324                 IFS='   '
 325                 echo "$ls_remote_result" |
 326                 while read sha1 name
 327                 do
 328                         test "z$name" = "z$remote_name" || continue
 329                         echo "$sha1"
 330                         break
 331                 done
 332           )
 333           expr "z$head" : "z$_x40\$" >/dev/null ||
 334                 die "No such ref $remote_name at $remote"
 335           echo >&2 "Fetching $remote_name from $remote using $proto"
 336           git-http-fetch -v -a "$head" "$remote/" || exit
 337           ;;
 338       rsync://*)
 339           test -n "$shallow_depth" &&
 340                 die "shallow clone with rsync not supported"
 341           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 342           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 343           head=$(git-rev-parse --verify TMP_HEAD)
 344           rm -f "$TMP_HEAD"
 345           test "$rsync_slurped_objects" || {
 346               rsync -av --ignore-existing --exclude info \
 347                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 348
 349               # Look at objects/info/alternates for rsync -- http will
 350               # support it natively and git native ones will do it on
 351               # the remote end.  Not having that file is not a crime.
 352               rsync -q "$remote/objects/info/alternates" \
 353                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 354                   rm -f "$GIT_DIR/TMP_ALT"
 355               if test -f "$GIT_DIR/TMP_ALT"
 356               then
 357                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 358                   while read alt
 359                   do
 360                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 361                       echo >&2 "Getting alternate: $alt"
 362                       rsync -av --ignore-existing --exclude info \
 363                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 364                   done
 365                   rm -f "$GIT_DIR/TMP_ALT"
 366               fi
 367               rsync_slurped_objects=t
 368           }
 369           ;;
 370       *)
 371           # We will do git native transport with just one call later.
 372           continue ;;
 373       esac
 374
 375       append_fetch_head "$head" "$remote" \
 376           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge" || exit
 377
 378   done
 379
 380   case "$remote" in
 381   http://* | https://* | ftp://* | rsync://* )
 382       ;; # we are already done.
 383   *)
 384     ( : subshell because we muck with IFS
 385       IFS="     $LF"
 386       (
 387           git-fetch-pack --thin $exec $keep $shallow_depth "$remote" $rref ||
 388           echo failed "$remote"
 389       ) |
 390       (
 391         trap '
 392                 if test -n "$keepfile" && test -f "$keepfile"
 393                 then
 394                         rm -f "$keepfile"
 395                 fi
 396         ' 0
 397
 398         keepfile=
 399         while read sha1 remote_name
 400         do
 401           case "$sha1" in
 402           failed)
 403                   echo >&2 "Fetch failure: $remote"
 404                   exit 1 ;;
 405           # special line coming from index-pack with the pack name
 406           pack)
 407                   continue ;;
 408           keep)
 409                   keepfile="$GIT_OBJECT_DIRECTORY/pack/pack-$remote_name.keep"
 410                   continue ;;
 411           esac
 412           found=
 413           single_force=
 414           for ref in $refs
 415           do
 416               case "$ref" in
 417               +$remote_name:*)
 418                   single_force=t
 419                   not_for_merge=
 420                   found="$ref"
 421                   break ;;
 422               .+$remote_name:*)
 423                   single_force=t
 424                   not_for_merge=t
 425                   found="$ref"
 426                   break ;;
 427               .$remote_name:*)
 428                   not_for_merge=t
 429                   found="$ref"
 430                   break ;;
 431               $remote_name:*)
 432                   not_for_merge=
 433                   found="$ref"
 434                   break ;;
 435               esac
 436           done
 437           local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
 438           append_fetch_head "$sha1" "$remote" \
 439                   "$remote_name" "$remote_nick" "$local_name" \
 440                   "$not_for_merge" || exit
 441         done
 442       )
 443     ) || exit ;;
 444   esac
 445
 446 }
 447
 448 fetch_main "$reflist" || exit
 449
 450 # automated tag following
 451 case "$no_tags$tags" in
 452 '')
 453         case "$reflist" in
 454         *:refs/*)
 455                 # effective only when we are following remote branch
 456                 # using local tracking branch.
 457                 taglist=$(IFS=' ' &&
 458                 echo "$ls_remote_result" |
 459                 git-show-ref --exclude-existing=refs/tags/ |
 460                 while read sha1 name
 461                 do
 462                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 463                         echo >&2 "Auto-following $name"
 464                         echo ".${name}:${name}"
 465                 done)
 466         esac
 467         case "$taglist" in
 468         '') ;;
 469         ?*)
 470                 # do not deepen a shallow tree when following tags
 471                 shallow_depth=
 472                 fetch_main "$taglist" || exit ;;
 473         esac
 474 esac
 475
 476 # If the original head was empty (i.e. no "master" yet), or
 477 # if we were told not to worry, we do not have to check.
 478 case "$orig_head" in
 479 '')
 480         ;;
 481 ?*)
 482         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 483         if test "$curr_head" != "$orig_head"
 484         then
 485             git-update-ref \
 486                         -m "$GIT_REFLOG_ACTION: Undoing incorrectly fetched HEAD." \
 487                         HEAD "$orig_head"
 488                 die "Cannot fetch into the current branch."
 489         fi
 490         ;;
 491 esac