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="$LF"
  13
  14 rloga=fetch
  15 no_tags=
  16 tags=
  17 append=
  18 force=
  19 verbose=
  20 update_head_ok=
  21 exec=
  22 upload_pack=
  23 keep=
  24 while case "$#" in 0) break ;; esac
  25 do
  26         case "$1" in
  27         -a|--a|--ap|--app|--appe|--appen|--append)
  28                 append=t
  29                 ;;
  30         --upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
  31         --upload-pa|--upload-pac|--upload-pack)
  32                 shift
  33                 exec="--exec=$1"
  34                 upload_pack="-u $1"
  35                 ;;
  36         -f|--f|--fo|--for|--forc|--force)
  37                 force=t
  38                 ;;
  39         -t|--t|--ta|--tag|--tags)
  40                 tags=t
  41                 ;;
  42         -n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
  43                 no_tags=t
  44                 ;;
  45         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
  46         --update-he|--update-hea|--update-head|--update-head-|\
  47         --update-head-o|--update-head-ok)
  48                 update_head_ok=t
  49                 ;;
  50         -v|--verbose)
  51                 verbose=Yes
  52                 ;;
  53         -k|--k|--ke|--kee|--keep)
  54                 keep='-k -k'
  55                 ;;
  56         --reflog-action=*)
  57                 rloga=`expr "z$1" : 'z-[^=]*=\(.*\)'`
  58                 ;;
  59         -*)
  60                 usage
  61                 ;;
  62         *)
  63                 break
  64                 ;;
  65         esac
  66         shift
  67 done
  68
  69 case "$#" in
  70 0)
  71         origin=$(get_default_remote)
  72         test -n "$(get_remote_url ${origin})" ||
  73                 die "Where do you want to fetch from today?"
  74         set x $origin ; shift ;;
  75 esac
  76
  77 remote_nick="$1"
  78 remote=$(get_remote_url "$@")
  79 refs=
  80 rref=
  81 rsync_slurped_objects=
  82
  83 rloga="$rloga $remote_nick"
  84 test "$remote_nick" = "$remote" || rloga="$rloga $remote"
  85
  86 if test "" = "$append"
  87 then
  88         : >"$GIT_DIR/FETCH_HEAD"
  89 fi
  90
  91 # Global that is reused later
  92 ls_remote_result=$(git ls-remote $upload_pack "$remote") ||
  93         die "Cannot find the reflist at $remote"
  94
  95 append_fetch_head () {
  96     head_="$1"
  97     remote_="$2"
  98     remote_name_="$3"
  99     remote_nick_="$4"
 100     local_name_="$5"
 101     case "$6" in
 102     t) not_for_merge_='not-for-merge' ;;
 103     '') not_for_merge_= ;;
 104     esac
 105
 106     # remote-nick is the URL given on the command line (or a shorthand)
 107     # remote-name is the $GIT_DIR relative refs/ path we computed
 108     # for this refspec.
 109
 110     # the $note_ variable will be fed to git-fmt-merge-msg for further
 111     # processing.
 112     case "$remote_name_" in
 113     HEAD)
 114         note_= ;;
 115     refs/heads/*)
 116         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
 117         note_="branch '$note_' of " ;;
 118     refs/tags/*)
 119         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
 120         note_="tag '$note_' of " ;;
 121     refs/remotes/*)
 122         note_="$(expr "$remote_name_" : 'refs/remotes/\(.*\)')"
 123         note_="remote branch '$note_' of " ;;
 124     *)
 125         note_="$remote_name of " ;;
 126     esac
 127     remote_1_=$(expr "z$remote_" : 'z\(.*\)\.git/*$') &&
 128         remote_="$remote_1_"
 129     note_="$note_$remote_"
 130
 131     # 2.6.11-tree tag would not be happy to be fed to resolve.
 132     if git-cat-file commit "$head_" >/dev/null 2>&1
 133     then
 134         headc_=$(git-rev-parse --verify "$head_^0") || exit
 135         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
 136     else
 137         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
 138     fi
 139
 140     update_local_ref "$local_name_" "$head_" "$note_"
 141 }
 142
 143 update_local_ref () {
 144     # If we are storing the head locally make sure that it is
 145     # a fast forward (aka "reverse push").
 146
 147     label_=$(git-cat-file -t $2)
 148     newshort_=$(git-rev-parse --short $2)
 149     if test -z "$1" ; then
 150         [ "$verbose" ] && echo >&2 "* fetched $3"
 151         [ "$verbose" ] && echo >&2 "  $label_: $newshort_"
 152         return 0
 153     fi
 154     oldshort_=$(git show-ref --hash --abbrev "$1" 2>/dev/null)
 155
 156     case "$1" in
 157     refs/tags/*)
 158         # Tags need not be pointing at commits so there
 159         # is no way to guarantee "fast-forward" anyway.
 160         if test -n "$oldshort_"
 161         then
 162                 if now_=$(git show-ref --hash "$1") && test "$now_" = "$2"
 163                 then
 164                         [ "$verbose" ] && echo >&2 "* $1: same as $3"
 165                         [ "$verbose" ] && echo >&2 "  $label_: $newshort_" ||:
 166                 else
 167                         echo >&2 "* $1: updating with $3"
 168                         echo >&2 "  $label_: $newshort_"
 169                         git-update-ref -m "$rloga: updating tag" "$1" "$2"
 170                 fi
 171         else
 172                 echo >&2 "* $1: storing $3"
 173                 echo >&2 "  $label_: $newshort_"
 174                 git-update-ref -m "$rloga: storing tag" "$1" "$2"
 175         fi
 176         ;;
 177
 178     refs/heads/* | refs/remotes/*)
 179         # $1 is the ref being updated.
 180         # $2 is the new value for the ref.
 181         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
 182         if test "$local"
 183         then
 184             # Require fast-forward.
 185             mb=$(git-merge-base "$local" "$2") &&
 186             case "$2,$mb" in
 187             $local,*)
 188                 if test -n "$verbose"
 189                 then
 190                         echo >&2 "* $1: same as $3"
 191                         echo >&2 "  $label_: $newshort_"
 192                 fi
 193                 ;;
 194             *,$local)
 195                 echo >&2 "* $1: fast forward to $3"
 196                 echo >&2 "  old..new: $oldshort_..$newshort_"
 197                 git-update-ref -m "$rloga: fast-forward" "$1" "$2" "$local"
 198                 ;;
 199             *)
 200                 false
 201                 ;;
 202             esac || {
 203                 case ",$force,$single_force," in
 204                 *,t,*)
 205                         echo >&2 "* $1: forcing update to non-fast forward $3"
 206                         echo >&2 "  old...new: $oldshort_...$newshort_"
 207                         git-update-ref -m "$rloga: forced-update" "$1" "$2" "$local"
 208                         ;;
 209                 *)
 210                         echo >&2 "* $1: not updating to non-fast forward $3"
 211                         echo >&2 "  old...new: $oldshort_...$newshort_"
 212                         exit 1
 213                         ;;
 214                 esac
 215             }
 216         else
 217             echo >&2 "* $1: storing $3"
 218             echo >&2 "  $label_: $newshort_"
 219             git-update-ref -m "$rloga: storing head" "$1" "$2"
 220         fi
 221         ;;
 222     esac
 223 }
 224
 225 case "$update_head_ok" in
 226 '')
 227         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 228         ;;
 229 esac
 230
 231 # If --tags (and later --heads or --all) is specified, then we are
 232 # not talking about defaults stored in Pull: line of remotes or
 233 # branches file, and just fetch those and refspecs explicitly given.
 234 # Otherwise we do what we always did.
 235
 236 reflist=$(get_remote_refs_for_fetch "$@")
 237 if test "$tags"
 238 then
 239         taglist=`IFS="  " &&
 240                   echo "$ls_remote_result" |
 241                   while read sha1 name
 242                   do
 243                         case "$sha1" in
 244                         fail)
 245                                 exit 1
 246                         esac
 247                         case "$name" in
 248                         *^*) continue ;;
 249                         refs/tags/*) ;;
 250                         *) continue ;;
 251                         esac
 252                         if git-check-ref-format "$name"
 253                         then
 254                             echo ".${name}:${name}"
 255                         else
 256                             echo >&2 "warning: tag ${name} ignored"
 257                         fi
 258                   done` || exit
 259         if test "$#" -gt 1
 260         then
 261                 # remote URL plus explicit refspecs; we need to merge them.
 262                 reflist="$reflist$LF$taglist"
 263         else
 264                 # No explicit refspecs; fetch tags only.
 265                 reflist=$taglist
 266         fi
 267 fi
 268
 269 fetch_main () {
 270   reflist="$1"
 271   refs=
 272   rref=
 273
 274   for ref in $reflist
 275   do
 276       refs="$refs$LF$ref"
 277
 278       # These are relative path from $GIT_DIR, typically starting at refs/
 279       # but may be HEAD
 280       if expr "z$ref" : 'z\.' >/dev/null
 281       then
 282           not_for_merge=t
 283           ref=$(expr "z$ref" : 'z\.\(.*\)')
 284       else
 285           not_for_merge=
 286       fi
 287       if expr "z$ref" : 'z+' >/dev/null
 288       then
 289           single_force=t
 290           ref=$(expr "z$ref" : 'z+\(.*\)')
 291       else
 292           single_force=
 293       fi
 294       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
 295       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 296
 297       rref="$rref$LF$remote_name"
 298
 299       # There are transports that can fetch only one head at a time...
 300       case "$remote" in
 301       http://* | https://* | ftp://*)
 302           proto=`expr "$remote" : '\([^:]*\):'`
 303           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 304               curl_extra_args="-k"
 305           fi
 306           if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
 307                 "`git-repo-config --bool http.noEPSV`" = true ]; then
 308               noepsv_opt="--disable-epsv"
 309           fi
 310
 311           # Find $remote_name from ls-remote output.
 312           head=$(
 313                 IFS='   '
 314                 echo "$ls_remote_result" |
 315                 while read sha1 name
 316                 do
 317                         test "z$name" = "z$remote_name" || continue
 318                         echo "$sha1"
 319                         break
 320                 done
 321           )
 322           expr "z$head" : "z$_x40\$" >/dev/null ||
 323                 die "No such ref $remote_name at $remote"
 324           echo >&2 "Fetching $remote_name from $remote using $proto"
 325           git-http-fetch -v -a "$head" "$remote/" || exit
 326           ;;
 327       rsync://*)
 328           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 329           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 330           head=$(git-rev-parse --verify TMP_HEAD)
 331           rm -f "$TMP_HEAD"
 332           test "$rsync_slurped_objects" || {
 333               rsync -av --ignore-existing --exclude info \
 334                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 335
 336               # Look at objects/info/alternates for rsync -- http will
 337               # support it natively and git native ones will do it on
 338               # the remote end.  Not having that file is not a crime.
 339               rsync -q "$remote/objects/info/alternates" \
 340                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 341                   rm -f "$GIT_DIR/TMP_ALT"
 342               if test -f "$GIT_DIR/TMP_ALT"
 343               then
 344                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 345                   while read alt
 346                   do
 347                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 348                       echo >&2 "Getting alternate: $alt"
 349                       rsync -av --ignore-existing --exclude info \
 350                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 351                   done
 352                   rm -f "$GIT_DIR/TMP_ALT"
 353               fi
 354               rsync_slurped_objects=t
 355           }
 356           ;;
 357       *)
 358           # We will do git native transport with just one call later.
 359           continue ;;
 360       esac
 361
 362       append_fetch_head "$head" "$remote" \
 363           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge" || exit
 364
 365   done
 366
 367   case "$remote" in
 368   http://* | https://* | ftp://* | rsync://* )
 369       ;; # we are already done.
 370   *)
 371     ( : subshell because we muck with IFS
 372       pack_lockfile=
 373       IFS="     $LF"
 374       (
 375           git-fetch-pack --thin $exec $keep "$remote" $rref || echo failed "$remote"
 376       ) |
 377       while read sha1 remote_name
 378       do
 379           case "$sha1" in
 380           failed)
 381                   echo >&2 "Fetch failure: $remote"
 382                   exit 1 ;;
 383           # special line coming from index-pack with the pack name
 384           pack)
 385                   continue ;;
 386           keep)
 387                   pack_lockfile="$GIT_OBJECT_DIRECTORY/pack/pack-$remote_name.keep"
 388                   continue ;;
 389           esac
 390           found=
 391           single_force=
 392           for ref in $refs
 393           do
 394               case "$ref" in
 395               +$remote_name:*)
 396                   single_force=t
 397                   not_for_merge=
 398                   found="$ref"
 399                   break ;;
 400               .+$remote_name:*)
 401                   single_force=t
 402                   not_for_merge=t
 403                   found="$ref"
 404                   break ;;
 405               .$remote_name:*)
 406                   not_for_merge=t
 407                   found="$ref"
 408                   break ;;
 409               $remote_name:*)
 410                   not_for_merge=
 411                   found="$ref"
 412                   break ;;
 413               esac
 414           done
 415           local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
 416           append_fetch_head "$sha1" "$remote" \
 417                   "$remote_name" "$remote_nick" "$local_name" \
 418                   "$not_for_merge" || exit
 419       done &&
 420       if [ "$pack_lockfile" ]; then rm -f "$pack_lockfile"; fi
 421     ) || exit ;;
 422   esac
 423
 424 }
 425
 426 fetch_main "$reflist" || exit
 427
 428 # automated tag following
 429 case "$no_tags$tags" in
 430 '')
 431         case "$reflist" in
 432         *:refs/*)
 433                 # effective only when we are following remote branch
 434                 # using local tracking branch.
 435                 taglist=$(IFS=" " &&
 436                 echo "$ls_remote_result" |
 437                 sed -n  -e 's|^\('"$_x40"'\)    \(refs/tags/.*\)^{}$|\1 \2|p' \
 438                         -e 's|^\('"$_x40"'\)    \(refs/tags/.*\)$|\1 \2|p' |
 439                 while read sha1 name
 440                 do
 441                         git-show-ref --verify --quiet -- "$name" && continue
 442                         git-check-ref-format "$name" || {
 443                                 echo >&2 "warning: tag ${name} ignored"
 444                                 continue
 445                         }
 446                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 447                         echo >&2 "Auto-following $name"
 448                         echo ".${name}:${name}"
 449                 done)
 450         esac
 451         case "$taglist" in
 452         '') ;;
 453         ?*)
 454                 fetch_main "$taglist" || exit ;;
 455         esac
 456 esac
 457
 458 # If the original head was empty (i.e. no "master" yet), or
 459 # if we were told not to worry, we do not have to check.
 460 case "$orig_head" in
 461 '')
 462         ;;
 463 ?*)
 464         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 465         if test "$curr_head" != "$orig_head"
 466         then
 467             git-update-ref \
 468                         -m "$rloga: Undoing incorrectly fetched HEAD." \
 469                         HEAD "$orig_head"
 470                 die "Cannot fetch into the current branch."
 471         fi
 472         ;;
 473 esac