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 no_progress=
  28 test -t 1 || no_progress=--no-progress
  29 while case "$#" in 0) break ;; esac
  30 do
  31         case "$1" in
  32         -a|--a|--ap|--app|--appe|--appen|--append)
  33                 append=t
  34                 ;;
  35         --upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
  36         --upload-pa|--upload-pac|--upload-pack)
  37                 shift
  38                 exec="--upload-pack=$1"
  39                 ;;
  40         --upl=*|--uplo=*|--uploa=*|--upload=*|\
  41         --upload-=*|--upload-p=*|--upload-pa=*|--upload-pac=*|--upload-pack=*)
  42                 exec=--upload-pack=$(expr "z$1" : 'z-[^=]*=\(.*\)')
  43                 shift
  44                 ;;
  45         -f|--f|--fo|--for|--forc|--force)
  46                 force=t
  47                 ;;
  48         -t|--t|--ta|--tag|--tags)
  49                 tags=t
  50                 ;;
  51         -n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
  52                 no_tags=t
  53                 ;;
  54         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
  55         --update-he|--update-hea|--update-head|--update-head-|\
  56         --update-head-o|--update-head-ok)
  57                 update_head_ok=t
  58                 ;;
  59         -v|--verbose)
  60                 verbose=Yes
  61                 ;;
  62         -k|--k|--ke|--kee|--keep)
  63                 keep='-k -k'
  64                 ;;
  65         --depth=*)
  66                 shallow_depth="--depth=`expr "z$1" : 'z-[^=]*=\(.*\)'`"
  67                 ;;
  68         --depth)
  69                 shift
  70                 shallow_depth="--depth=$1"
  71                 ;;
  72         -*)
  73                 usage
  74                 ;;
  75         *)
  76                 break
  77                 ;;
  78         esac
  79         shift
  80 done
  81
  82 case "$#" in
  83 0)
  84         origin=$(get_default_remote)
  85         test -n "$(get_remote_url ${origin})" ||
  86                 die "Where do you want to fetch from today?"
  87         set x $origin ; shift ;;
  88 esac
  89
  90 if test -z "$exec"
  91 then
  92         # No command line override and we have configuration for the remote.
  93         exec="--upload-pack=$(get_uploadpack $1)"
  94 fi
  95
  96 remote_nick="$1"
  97 remote=$(get_remote_url "$@")
  98 refs=
  99 rref=
 100 rsync_slurped_objects=
 101
 102 if test "" = "$append"
 103 then
 104         : >"$GIT_DIR/FETCH_HEAD"
 105 fi
 106
 107 # Global that is reused later
 108 ls_remote_result=$(git ls-remote $exec "$remote") ||
 109         die "Cannot get the repository state from $remote"
 110
 111 append_fetch_head () {
 112     head_="$1"
 113     remote_="$2"
 114     remote_name_="$3"
 115     remote_nick_="$4"
 116     local_name_="$5"
 117     case "$6" in
 118     t) not_for_merge_='not-for-merge' ;;
 119     '') not_for_merge_= ;;
 120     esac
 121
 122     # remote-nick is the URL given on the command line (or a shorthand)
 123     # remote-name is the $GIT_DIR relative refs/ path we computed
 124     # for this refspec.
 125
 126     # the $note_ variable will be fed to git-fmt-merge-msg for further
 127     # processing.
 128     case "$remote_name_" in
 129     HEAD)
 130         note_= ;;
 131     refs/heads/*)
 132         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
 133         note_="branch '$note_' of " ;;
 134     refs/tags/*)
 135         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
 136         note_="tag '$note_' of " ;;
 137     refs/remotes/*)
 138         note_="$(expr "$remote_name_" : 'refs/remotes/\(.*\)')"
 139         note_="remote branch '$note_' of " ;;
 140     *)
 141         note_="$remote_name of " ;;
 142     esac
 143     remote_1_=$(expr "z$remote_" : 'z\(.*\)\.git/*$') &&
 144         remote_="$remote_1_"
 145     note_="$note_$remote_"
 146
 147     # 2.6.11-tree tag would not be happy to be fed to resolve.
 148     if git-cat-file commit "$head_" >/dev/null 2>&1
 149     then
 150         headc_=$(git-rev-parse --verify "$head_^0") || exit
 151         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
 152     else
 153         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
 154     fi
 155
 156     update_local_ref "$local_name_" "$head_" "$note_"
 157 }
 158
 159 update_local_ref () {
 160     # If we are storing the head locally make sure that it is
 161     # a fast forward (aka "reverse push").
 162
 163     label_=$(git-cat-file -t $2)
 164     newshort_=$(git-rev-parse --short $2)
 165     if test -z "$1" ; then
 166         [ "$verbose" ] && echo >&2 "* fetched $3"
 167         [ "$verbose" ] && echo >&2 "  $label_: $newshort_"
 168         return 0
 169     fi
 170     oldshort_=$(git show-ref --hash --abbrev "$1" 2>/dev/null)
 171
 172     case "$1" in
 173     refs/tags/*)
 174         # Tags need not be pointing at commits so there
 175         # is no way to guarantee "fast-forward" anyway.
 176         if test -n "$oldshort_"
 177         then
 178                 if now_=$(git show-ref --hash "$1") && test "$now_" = "$2"
 179                 then
 180                         [ "$verbose" ] && echo >&2 "* $1: same as $3"
 181                         [ "$verbose" ] && echo >&2 "  $label_: $newshort_" ||:
 182                 else
 183                         echo >&2 "* $1: updating with $3"
 184                         echo >&2 "  $label_: $newshort_"
 185                         git-update-ref -m "$GIT_REFLOG_ACTION: updating tag" "$1" "$2"
 186                 fi
 187         else
 188                 echo >&2 "* $1: storing $3"
 189                 echo >&2 "  $label_: $newshort_"
 190                 git-update-ref -m "$GIT_REFLOG_ACTION: storing tag" "$1" "$2"
 191         fi
 192         ;;
 193
 194     refs/heads/* | refs/remotes/*)
 195         # $1 is the ref being updated.
 196         # $2 is the new value for the ref.
 197         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
 198         if test "$local"
 199         then
 200             # Require fast-forward.
 201             mb=$(git-merge-base "$local" "$2") &&
 202             case "$2,$mb" in
 203             $local,*)
 204                 if test -n "$verbose"
 205                 then
 206                         echo >&2 "* $1: same as $3"
 207                         echo >&2 "  $label_: $newshort_"
 208                 fi
 209                 ;;
 210             *,$local)
 211                 echo >&2 "* $1: fast forward to $3"
 212                 echo >&2 "  old..new: $oldshort_..$newshort_"
 213                 git-update-ref -m "$GIT_REFLOG_ACTION: fast-forward" "$1" "$2" "$local"
 214                 ;;
 215             *)
 216                 false
 217                 ;;
 218             esac || {
 219                 case ",$force,$single_force," in
 220                 *,t,*)
 221                         echo >&2 "* $1: forcing update to non-fast forward $3"
 222                         echo >&2 "  old...new: $oldshort_...$newshort_"
 223                         git-update-ref -m "$GIT_REFLOG_ACTION: forced-update" "$1" "$2" "$local"
 224                         ;;
 225                 *)
 226                         echo >&2 "* $1: not updating to non-fast forward $3"
 227                         echo >&2 "  old...new: $oldshort_...$newshort_"
 228                         exit 1
 229                         ;;
 230                 esac
 231             }
 232         else
 233             echo >&2 "* $1: storing $3"
 234             echo >&2 "  $label_: $newshort_"
 235             git-update-ref -m "$GIT_REFLOG_ACTION: storing head" "$1" "$2"
 236         fi
 237         ;;
 238     esac
 239 }
 240
 241 # updating the current HEAD with git-fetch in a bare
 242 # repository is always fine.
 243 if test -z "$update_head_ok" && test $(is_bare_repository) = false
 244 then
 245         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 246 fi
 247
 248 # Allow --notags from remote.$1.tagopt
 249 case "$tags$no_tags" in
 250 '')
 251         case "$(git-config --get "remote.$1.tagopt")" in
 252         --no-tags)
 253                 no_tags=t ;;
 254         esac
 255 esac
 256
 257 # If --tags (and later --heads or --all) is specified, then we are
 258 # not talking about defaults stored in Pull: line of remotes or
 259 # branches file, and just fetch those and refspecs explicitly given.
 260 # Otherwise we do what we always did.
 261
 262 reflist=$(get_remote_refs_for_fetch "$@")
 263 if test "$tags"
 264 then
 265         taglist=`IFS='  ' &&
 266                   echo "$ls_remote_result" |
 267                   git-show-ref --exclude-existing=refs/tags/ |
 268                   while read sha1 name
 269                   do
 270                         echo ".${name}:${name}"
 271                   done` || exit
 272         if test "$#" -gt 1
 273         then
 274                 # remote URL plus explicit refspecs; we need to merge them.
 275                 reflist="$reflist$LF$taglist"
 276         else
 277                 # No explicit refspecs; fetch tags only.
 278                 reflist=$taglist
 279         fi
 280 fi
 281
 282 fetch_main () {
 283   reflist="$1"
 284   refs=
 285   rref=
 286
 287   for ref in $reflist
 288   do
 289       refs="$refs$LF$ref"
 290
 291       # These are relative path from $GIT_DIR, typically starting at refs/
 292       # but may be HEAD
 293       if expr "z$ref" : 'z\.' >/dev/null
 294       then
 295           not_for_merge=t
 296           ref=$(expr "z$ref" : 'z\.\(.*\)')
 297       else
 298           not_for_merge=
 299       fi
 300       if expr "z$ref" : 'z+' >/dev/null
 301       then
 302           single_force=t
 303           ref=$(expr "z$ref" : 'z+\(.*\)')
 304       else
 305           single_force=
 306       fi
 307       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
 308       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 309
 310       rref="$rref$LF$remote_name"
 311
 312       # There are transports that can fetch only one head at a time...
 313       case "$remote" in
 314       http://* | https://* | ftp://*)
 315           test -n "$shallow_depth" &&
 316                 die "shallow clone with http not supported"
 317           proto=`expr "$remote" : '\([^:]*\):'`
 318           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 319               curl_extra_args="-k"
 320           fi
 321           if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
 322                 "`git-config --bool http.noEPSV`" = true ]; then
 323               noepsv_opt="--disable-epsv"
 324           fi
 325
 326           # Find $remote_name from ls-remote output.
 327           head=$(
 328                 IFS='   '
 329                 echo "$ls_remote_result" |
 330                 while read sha1 name
 331                 do
 332                         test "z$name" = "z$remote_name" || continue
 333                         echo "$sha1"
 334                         break
 335                 done
 336           )
 337           expr "z$head" : "z$_x40\$" >/dev/null ||
 338                 die "No such ref $remote_name at $remote"
 339           echo >&2 "Fetching $remote_name from $remote using $proto"
 340           git-http-fetch -v -a "$head" "$remote/" || exit
 341           ;;
 342       rsync://*)
 343           test -n "$shallow_depth" &&
 344                 die "shallow clone with rsync not supported"
 345           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 346           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 347           head=$(git-rev-parse --verify TMP_HEAD)
 348           rm -f "$TMP_HEAD"
 349           test "$rsync_slurped_objects" || {
 350               rsync -av --ignore-existing --exclude info \
 351                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 352
 353               # Look at objects/info/alternates for rsync -- http will
 354               # support it natively and git native ones will do it on
 355               # the remote end.  Not having that file is not a crime.
 356               rsync -q "$remote/objects/info/alternates" \
 357                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 358                   rm -f "$GIT_DIR/TMP_ALT"
 359               if test -f "$GIT_DIR/TMP_ALT"
 360               then
 361                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 362                   while read alt
 363                   do
 364                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 365                       echo >&2 "Getting alternate: $alt"
 366                       rsync -av --ignore-existing --exclude info \
 367                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 368                   done
 369                   rm -f "$GIT_DIR/TMP_ALT"
 370               fi
 371               rsync_slurped_objects=t
 372           }
 373           ;;
 374       *)
 375           # We will do git native transport with just one call later.
 376           continue ;;
 377       esac
 378
 379       append_fetch_head "$head" "$remote" \
 380           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge" || exit
 381
 382   done
 383
 384   case "$remote" in
 385   http://* | https://* | ftp://* | rsync://* )
 386       ;; # we are already done.
 387   *)
 388     ( : subshell because we muck with IFS
 389       IFS="     $LF"
 390       (
 391         if test -f "$remote" ; then
 392             test -n "$shallow_depth" &&
 393                 die "shallow clone with bundle is not supported"
 394             git-bundle unbundle "$remote" $rref ||
 395             echo failed "$remote"
 396         else
 397           git-fetch-pack --thin $exec $keep $shallow_depth $no_progress \
 398                 "$remote" $rref ||
 399           echo failed "$remote"
 400         fi
 401       ) |
 402       (
 403         trap '
 404                 if test -n "$keepfile" && test -f "$keepfile"
 405                 then
 406                         rm -f "$keepfile"
 407                 fi
 408         ' 0
 409
 410         keepfile=
 411         while read sha1 remote_name
 412         do
 413           case "$sha1" in
 414           failed)
 415                   echo >&2 "Fetch failure: $remote"
 416                   exit 1 ;;
 417           # special line coming from index-pack with the pack name
 418           pack)
 419                   continue ;;
 420           keep)
 421                   keepfile="$GIT_OBJECT_DIRECTORY/pack/pack-$remote_name.keep"
 422                   continue ;;
 423           esac
 424           found=
 425           single_force=
 426           for ref in $refs
 427           do
 428               case "$ref" in
 429               +$remote_name:*)
 430                   single_force=t
 431                   not_for_merge=
 432                   found="$ref"
 433                   break ;;
 434               .+$remote_name:*)
 435                   single_force=t
 436                   not_for_merge=t
 437                   found="$ref"
 438                   break ;;
 439               .$remote_name:*)
 440                   not_for_merge=t
 441                   found="$ref"
 442                   break ;;
 443               $remote_name:*)
 444                   not_for_merge=
 445                   found="$ref"
 446                   break ;;
 447               esac
 448           done
 449           local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
 450           append_fetch_head "$sha1" "$remote" \
 451                   "$remote_name" "$remote_nick" "$local_name" \
 452                   "$not_for_merge" || exit
 453         done
 454       )
 455     ) || exit ;;
 456   esac
 457
 458 }
 459
 460 fetch_main "$reflist" || exit
 461
 462 # automated tag following
 463 case "$no_tags$tags" in
 464 '')
 465         case "$reflist" in
 466         *:refs/*)
 467                 # effective only when we are following remote branch
 468                 # using local tracking branch.
 469                 taglist=$(IFS=' ' &&
 470                 echo "$ls_remote_result" |
 471                 git-show-ref --exclude-existing=refs/tags/ |
 472                 while read sha1 name
 473                 do
 474                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 475                         echo >&2 "Auto-following $name"
 476                         echo ".${name}:${name}"
 477                 done)
 478         esac
 479         case "$taglist" in
 480         '') ;;
 481         ?*)
 482                 # do not deepen a shallow tree when following tags
 483                 shallow_depth=
 484                 fetch_main "$taglist" || exit ;;
 485         esac
 486 esac
 487
 488 # If the original head was empty (i.e. no "master" yet), or
 489 # if we were told not to worry, we do not have to check.
 490 case "$orig_head" in
 491 '')
 492         ;;
 493 ?*)
 494         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 495         if test "$curr_head" != "$orig_head"
 496         then
 497             git-update-ref \
 498                         -m "$GIT_REFLOG_ACTION: Undoing incorrectly fetched HEAD." \
 499                         HEAD "$orig_head"
 500                 die "Cannot fetch into the current branch."
 501         fi
 502         ;;
 503 esac