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