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="$LF"
  13
  14 rloga=fetch
  15 no_tags=
  16 tags=
  17 append=
  18 force=
  19 verbose=
  20 update_head_ok=
  21 exec=
  22 upload_pack=
  23 keep=--thin
  24 while case "$#" 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=--keep
  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 append_fetch_head () {
  92     head_="$1"
  93     remote_="$2"
  94     remote_name_="$3"
  95     remote_nick_="$4"
  96     local_name_="$5"
  97     case "$6" in
  98     t) not_for_merge_='not-for-merge' ;;
  99     '') not_for_merge_= ;;
 100     esac
 101
 102     # remote-nick is the URL given on the command line (or a shorthand)
 103     # remote-name is the $GIT_DIR relative refs/ path we computed
 104     # for this refspec.
 105
 106     # the $note_ variable will be fed to git-fmt-merge-msg for further
 107     # processing.
 108     case "$remote_name_" in
 109     HEAD)
 110         note_= ;;
 111     refs/heads/*)
 112         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
 113         note_="branch '$note_' of " ;;
 114     refs/tags/*)
 115         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
 116         note_="tag '$note_' of " ;;
 117     refs/remotes/*)
 118         note_="$(expr "$remote_name_" : 'refs/remotes/\(.*\)')"
 119         note_="remote branch '$note_' of " ;;
 120     *)
 121         note_="$remote_name of " ;;
 122     esac
 123     remote_1_=$(expr "z$remote_" : 'z\(.*\)\.git/*$') &&
 124         remote_="$remote_1_"
 125     note_="$note_$remote_"
 126
 127     # 2.6.11-tree tag would not be happy to be fed to resolve.
 128     if git-cat-file commit "$head_" >/dev/null 2>&1
 129     then
 130         headc_=$(git-rev-parse --verify "$head_^0") || exit
 131         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
 132         [ "$verbose" ] && echo >&2 "* committish: $head_"
 133         [ "$verbose" ] && echo >&2 "  $note_"
 134     else
 135         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
 136         [ "$verbose" ] && echo >&2 "* non-commit: $head_"
 137         [ "$verbose" ] && echo >&2 "  $note_"
 138     fi
 139     if test "$local_name_" != ""
 140     then
 141         # We are storing the head locally.  Make sure that it is
 142         # a fast forward (aka "reverse push").
 143         fast_forward_local "$local_name_" "$head_" "$note_"
 144     fi
 145 }
 146
 147 fast_forward_local () {
 148     mkdir -p "$(dirname "$GIT_DIR/$1")"
 149     case "$1" in
 150     refs/tags/*)
 151         # Tags need not be pointing at commits so there
 152         # is no way to guarantee "fast-forward" anyway.
 153         if test -f "$GIT_DIR/$1"
 154         then
 155                 if now_=$(cat "$GIT_DIR/$1") && test "$now_" = "$2"
 156                 then
 157                         [ "$verbose" ] && echo >&2 "* $1: same as $3" ||:
 158                 else
 159                         echo >&2 "* $1: updating with $3"
 160                         git-update-ref -m "$rloga: updating tag" "$1" "$2"
 161                 fi
 162         else
 163                 echo >&2 "* $1: storing $3"
 164                 git-update-ref -m "$rloga: storing tag" "$1" "$2"
 165         fi
 166         ;;
 167
 168     refs/heads/* | refs/remotes/*)
 169         # $1 is the ref being updated.
 170         # $2 is the new value for the ref.
 171         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
 172         if test "$local"
 173         then
 174             # Require fast-forward.
 175             mb=$(git-merge-base "$local" "$2") &&
 176             case "$2,$mb" in
 177             $local,*)
 178                 if test -n "$verbose"
 179                 then
 180                         echo >&2 "* $1: same as $3"
 181                 fi
 182                 ;;
 183             *,$local)
 184                 echo >&2 "* $1: fast forward to $3"
 185                 echo >&2 "  from $local to $2"
 186                 git-update-ref -m "$rloga: fast-forward" "$1" "$2" "$local"
 187                 ;;
 188             *)
 189                 false
 190                 ;;
 191             esac || {
 192                 echo >&2 "* $1: does not fast forward to $3;"
 193                 case ",$force,$single_force," in
 194                 *,t,*)
 195                         echo >&2 "  forcing update."
 196                         git-update-ref -m "$rloga: forced-update" "$1" "$2" "$local"
 197                         ;;
 198                 *)
 199                         echo >&2 "  not updating."
 200                         exit 1
 201                         ;;
 202                 esac
 203             }
 204         else
 205             echo >&2 "* $1: storing $3"
 206             git-update-ref -m "$rloga: storing head" "$1" "$2"
 207         fi
 208         ;;
 209     esac
 210 }
 211
 212 case "$update_head_ok" in
 213 '')
 214         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 215         ;;
 216 esac
 217
 218 # If --tags (and later --heads or --all) is specified, then we are
 219 # not talking about defaults stored in Pull: line of remotes or
 220 # branches file, and just fetch those and refspecs explicitly given.
 221 # Otherwise we do what we always did.
 222
 223 reflist=$(get_remote_refs_for_fetch "$@")
 224 if test "$tags"
 225 then
 226         taglist=`IFS="  " &&
 227                   (
 228                         git-ls-remote $upload_pack --tags "$remote" ||
 229                         echo fail ouch
 230                   ) |
 231                   while read sha1 name
 232                   do
 233                         case "$sha1" in
 234                         fail)
 235                                 exit 1
 236                         esac
 237                         case "$name" in
 238                         *^*) continue ;;
 239                         esac
 240                         if git-check-ref-format "$name"
 241                         then
 242                             echo ".${name}:${name}"
 243                         else
 244                             echo >&2 "warning: tag ${name} ignored"
 245                         fi
 246                   done` || exit
 247         if test "$#" -gt 1
 248         then
 249                 # remote URL plus explicit refspecs; we need to merge them.
 250                 reflist="$reflist$LF$taglist"
 251         else
 252                 # No explicit refspecs; fetch tags only.
 253                 reflist=$taglist
 254         fi
 255 fi
 256
 257 fetch_main () {
 258   reflist="$1"
 259   refs=
 260   rref=
 261
 262   for ref in $reflist
 263   do
 264       refs="$refs$LF$ref"
 265
 266       # These are relative path from $GIT_DIR, typically starting at refs/
 267       # but may be HEAD
 268       if expr "z$ref" : 'z\.' >/dev/null
 269       then
 270           not_for_merge=t
 271           ref=$(expr "z$ref" : 'z\.\(.*\)')
 272       else
 273           not_for_merge=
 274       fi
 275       if expr "z$ref" : 'z+' >/dev/null
 276       then
 277           single_force=t
 278           ref=$(expr "z$ref" : 'z+\(.*\)')
 279       else
 280           single_force=
 281       fi
 282       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
 283       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 284
 285       rref="$rref$LF$remote_name"
 286
 287       # There are transports that can fetch only one head at a time...
 288       case "$remote" in
 289       http://* | https://* | ftp://*)
 290           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 291               curl_extra_args="-k"
 292           fi
 293           if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
 294                 "`git-repo-config --bool http.noEPSV`" = true ]; then
 295               noepsv_opt="--disable-epsv"
 296           fi
 297           max_depth=5
 298           depth=0
 299           head="ref: $remote_name"
 300           while (expr "z$head" : "zref:" && expr $depth \< $max_depth) >/dev/null
 301           do
 302             remote_name_quoted=$(@@PERL@@ -e '
 303               my $u = $ARGV[0];
 304               $u =~ s/^ref:\s*//;
 305               $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
 306               print "$u";
 307           ' "$head")
 308             head=$(curl -nsfL $curl_extra_args $noepsv_opt "$remote/$remote_name_quoted")
 309             depth=$( expr \( $depth + 1 \) )
 310           done
 311           expr "z$head" : "z$_x40\$" >/dev/null ||
 312               die "Failed to fetch $remote_name from $remote"
 313           echo >&2 Fetching "$remote_name from $remote" using http
 314           git-http-fetch -v -a "$head" "$remote/" || exit
 315           ;;
 316       rsync://*)
 317           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 318           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 319           head=$(git-rev-parse --verify TMP_HEAD)
 320           rm -f "$TMP_HEAD"
 321           test "$rsync_slurped_objects" || {
 322               rsync -av --ignore-existing --exclude info \
 323                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 324
 325               # Look at objects/info/alternates for rsync -- http will
 326               # support it natively and git native ones will do it on
 327               # the remote end.  Not having that file is not a crime.
 328               rsync -q "$remote/objects/info/alternates" \
 329                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 330                   rm -f "$GIT_DIR/TMP_ALT"
 331               if test -f "$GIT_DIR/TMP_ALT"
 332               then
 333                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 334                   while read alt
 335                   do
 336                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 337                       echo >&2 "Getting alternate: $alt"
 338                       rsync -av --ignore-existing --exclude info \
 339                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 340                   done
 341                   rm -f "$GIT_DIR/TMP_ALT"
 342               fi
 343               rsync_slurped_objects=t
 344           }
 345           ;;
 346       *)
 347           # We will do git native transport with just one call later.
 348           continue ;;
 349       esac
 350
 351       append_fetch_head "$head" "$remote" \
 352           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 353
 354   done
 355
 356   case "$remote" in
 357   http://* | https://* | ftp://* | rsync://* )
 358       ;; # we are already done.
 359   *)
 360     ( : subshell because we muck with IFS
 361       IFS="     $LF"
 362       (
 363           git-fetch-pack $exec $keep "$remote" $rref || echo failed "$remote"
 364       ) |
 365       while read sha1 remote_name
 366       do
 367           case "$sha1" in
 368           failed)
 369                   echo >&2 "Fetch failure: $remote"
 370                   exit 1 ;;
 371           esac
 372           found=
 373           single_force=
 374           for ref in $refs
 375           do
 376               case "$ref" in
 377               +$remote_name:*)
 378                   single_force=t
 379                   not_for_merge=
 380                   found="$ref"
 381                   break ;;
 382               .+$remote_name:*)
 383                   single_force=t
 384                   not_for_merge=t
 385                   found="$ref"
 386                   break ;;
 387               .$remote_name:*)
 388                   not_for_merge=t
 389                   found="$ref"
 390                   break ;;
 391               $remote_name:*)
 392                   not_for_merge=
 393                   found="$ref"
 394                   break ;;
 395               esac
 396           done
 397           local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
 398           append_fetch_head "$sha1" "$remote" \
 399                   "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 400       done
 401     ) || exit ;;
 402   esac
 403
 404 }
 405
 406 fetch_main "$reflist"
 407
 408 # automated tag following
 409 case "$no_tags$tags" in
 410 '')
 411         case "$reflist" in
 412         *:refs/*)
 413                 # effective only when we are following remote branch
 414                 # using local tracking branch.
 415                 taglist=$(IFS=" " &&
 416                 git-ls-remote $upload_pack --tags "$remote" |
 417                 sed -ne 's|^\([0-9a-f]*\)[      ]\(refs/tags/.*\)^{}$|\1 \2|p' |
 418                 while read sha1 name
 419                 do
 420                         git-show-ref --verify --quiet -- $name && continue
 421                         git-check-ref-format "$name" || {
 422                                 echo >&2 "warning: tag ${name} ignored"
 423                                 continue
 424                         }
 425                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 426                         echo >&2 "Auto-following $name"
 427                         echo ".${name}:${name}"
 428                 done)
 429         esac
 430         case "$taglist" in
 431         '') ;;
 432         ?*)
 433                 fetch_main "$taglist" ;;
 434         esac
 435 esac
 436
 437 # If the original head was empty (i.e. no "master" yet), or
 438 # if we were told not to worry, we do not have to check.
 439 case ",$update_head_ok,$orig_head," in
 440 *,, | t,* )
 441         ;;
 442 *)
 443         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 444         if test "$curr_head" != "$orig_head"
 445         then
 446             git-update-ref \
 447                         -m "$rloga: Undoing incorrectly fetched HEAD." \
 448                         HEAD "$orig_head"
 449                 die "Cannot fetch into the current branch."
 450         fi
 451         ;;
 452 esac