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="$LF"
  13
  14 rloga=fetch
  15 no_tags=
  16 tags=
  17 append=
  18 force=
  19 verbose=
  20 update_head_ok=
  21 exec=
  22 upload_pack=
  23 while case "$#" in 0) break ;; esac
  24 do
  25         case "$1" in
  26         -a|--a|--ap|--app|--appe|--appen|--append)
  27                 append=t
  28                 ;;
  29         --upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
  30         --upload-pa|--upload-pac|--upload-pack)
  31                 shift
  32                 exec="--exec=$1"
  33                 upload_pack="-u $1"
  34                 ;;
  35         -f|--f|--fo|--for|--forc|--force)
  36                 force=t
  37                 ;;
  38         -t|--t|--ta|--tag|--tags)
  39                 tags=t
  40                 ;;
  41         -n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
  42                 no_tags=t
  43                 ;;
  44         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
  45         --update-he|--update-hea|--update-head|--update-head-|\
  46         --update-head-o|--update-head-ok)
  47                 update_head_ok=t
  48                 ;;
  49         -v|--verbose)
  50                 verbose=Yes
  51                 ;;
  52         -k|--k|--ke|--kee|--keep)
  53                 keep=--keep
  54                 ;;
  55         --reflog-action=*)
  56                 rloga=`expr "z$1" : 'z-[^=]*=\(.*\)'`
  57                 ;;
  58         -*)
  59                 usage
  60                 ;;
  61         *)
  62                 break
  63                 ;;
  64         esac
  65         shift
  66 done
  67
  68 case "$#" in
  69 0)
  70         test -f "$GIT_DIR/branches/origin" ||
  71                 test -f "$GIT_DIR/remotes/origin" ||
  72                         die "Where do you want to fetch from today?"
  73         set origin ;;
  74 esac
  75
  76 remote_nick="$1"
  77 remote=$(get_remote_url "$@")
  78 refs=
  79 rref=
  80 rsync_slurped_objects=
  81
  82 rloga="$rloga $remote_nick"
  83 test "$remote_nick" = "$remote" || rloga="$rloga $remote"
  84
  85 if test "" = "$append"
  86 then
  87         : >"$GIT_DIR/FETCH_HEAD"
  88 fi
  89
  90 append_fetch_head () {
  91     head_="$1"
  92     remote_="$2"
  93     remote_name_="$3"
  94     remote_nick_="$4"
  95     local_name_="$5"
  96     case "$6" in
  97     t) not_for_merge_='not-for-merge' ;;
  98     '') not_for_merge_= ;;
  99     esac
 100
 101     # remote-nick is the URL given on the command line (or a shorthand)
 102     # remote-name is the $GIT_DIR relative refs/ path we computed
 103     # for this refspec.
 104
 105     # the $note_ variable will be fed to git-fmt-merge-msg for further
 106     # processing.
 107     case "$remote_name_" in
 108     HEAD)
 109         note_= ;;
 110     refs/heads/*)
 111         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
 112         note_="branch '$note_' of " ;;
 113     refs/tags/*)
 114         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
 115         note_="tag '$note_' of " ;;
 116     refs/remotes/*)
 117         note_="$(expr "$remote_name_" : 'refs/remotes/\(.*\)')"
 118         note_="remote branch '$note_' of " ;;
 119     *)
 120         note_="$remote_name of " ;;
 121     esac
 122     remote_1_=$(expr "z$remote_" : 'z\(.*\)\.git/*$') &&
 123         remote_="$remote_1_"
 124     note_="$note_$remote_"
 125
 126     # 2.6.11-tree tag would not be happy to be fed to resolve.
 127     if git-cat-file commit "$head_" >/dev/null 2>&1
 128     then
 129         headc_=$(git-rev-parse --verify "$head_^0") || exit
 130         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
 131         [ "$verbose" ] && echo >&2 "* committish: $head_"
 132         [ "$verbose" ] && echo >&2 "  $note_"
 133     else
 134         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
 135         [ "$verbose" ] && echo >&2 "* non-commit: $head_"
 136         [ "$verbose" ] && echo >&2 "  $note_"
 137     fi
 138     if test "$local_name_" != ""
 139     then
 140         # We are storing the head locally.  Make sure that it is
 141         # a fast forward (aka "reverse push").
 142         fast_forward_local "$local_name_" "$head_" "$note_"
 143     fi
 144 }
 145
 146 fast_forward_local () {
 147     mkdir -p "$(dirname "$GIT_DIR/$1")"
 148     case "$1" in
 149     refs/tags/*)
 150         # Tags need not be pointing at commits so there
 151         # is no way to guarantee "fast-forward" anyway.
 152         if test -f "$GIT_DIR/$1"
 153         then
 154                 if now_=$(cat "$GIT_DIR/$1") && test "$now_" = "$2"
 155                 then
 156                         [ "$verbose" ] && echo >&2 "* $1: same as $3" ||:
 157                 else
 158                         echo >&2 "* $1: updating with $3"
 159                         git-update-ref -m "$rloga: updating tag" "$1" "$2"
 160                 fi
 161         else
 162                 echo >&2 "* $1: storing $3"
 163                 git-update-ref -m "$rloga: storing tag" "$1" "$2"
 164         fi
 165         ;;
 166
 167     refs/heads/* | refs/remotes/*)
 168         # $1 is the ref being updated.
 169         # $2 is the new value for the ref.
 170         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
 171         if test "$local"
 172         then
 173             # Require fast-forward.
 174             mb=$(git-merge-base "$local" "$2") &&
 175             case "$2,$mb" in
 176             $local,*)
 177                 if test -n "$verbose"
 178                 then
 179                         echo >&2 "* $1: same as $3"
 180                 fi
 181                 ;;
 182             *,$local)
 183                 echo >&2 "* $1: fast forward to $3"
 184                 echo >&2 "  from $local to $2"
 185                 git-update-ref -m "$rloga: fast-forward" "$1" "$2" "$local"
 186                 ;;
 187             *)
 188                 false
 189                 ;;
 190             esac || {
 191                 echo >&2 "* $1: does not fast forward to $3;"
 192                 case ",$force,$single_force," in
 193                 *,t,*)
 194                         echo >&2 "  forcing update."
 195                         git-update-ref -m "$rloga: forced-update" "$1" "$2" "$local"
 196                         ;;
 197                 *)
 198                         echo >&2 "  not updating."
 199                         exit 1
 200                         ;;
 201                 esac
 202             }
 203         else
 204             echo >&2 "* $1: storing $3"
 205             git-update-ref -m "$rloga: storing head" "$1" "$2"
 206         fi
 207         ;;
 208     esac
 209 }
 210
 211 case "$update_head_ok" in
 212 '')
 213         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 214         ;;
 215 esac
 216
 217 # If --tags (and later --heads or --all) is specified, then we are
 218 # not talking about defaults stored in Pull: line of remotes or
 219 # branches file, and just fetch those and refspecs explicitly given.
 220 # Otherwise we do what we always did.
 221
 222 reflist=$(get_remote_refs_for_fetch "$@")
 223 if test "$tags"
 224 then
 225         taglist=`IFS="  " &&
 226                   git-ls-remote $upload_pack --tags "$remote" |
 227                   while read sha1 name
 228                   do
 229                         case "$name" in
 230                         *^*) continue ;;
 231                         esac
 232                         if git-check-ref-format "$name"
 233                         then
 234                             echo ".${name}:${name}"
 235                         else
 236                             echo >&2 "warning: tag ${name} ignored"
 237                         fi
 238                   done`
 239         if test "$#" -gt 1
 240         then
 241                 # remote URL plus explicit refspecs; we need to merge them.
 242                 reflist="$reflist$LF$taglist"
 243         else
 244                 # No explicit refspecs; fetch tags only.
 245                 reflist=$taglist
 246         fi
 247 fi
 248
 249 fetch_main () {
 250   reflist="$1"
 251   refs=
 252
 253   for ref in $reflist
 254   do
 255       refs="$refs$LF$ref"
 256
 257       # These are relative path from $GIT_DIR, typically starting at refs/
 258       # but may be HEAD
 259       if expr "z$ref" : 'z\.' >/dev/null
 260       then
 261           not_for_merge=t
 262           ref=$(expr "z$ref" : 'z\.\(.*\)')
 263       else
 264           not_for_merge=
 265       fi
 266       if expr "z$ref" : 'z+' >/dev/null
 267       then
 268           single_force=t
 269           ref=$(expr "z$ref" : 'z+\(.*\)')
 270       else
 271           single_force=
 272       fi
 273       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
 274       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 275
 276       rref="$rref$LF$remote_name"
 277
 278       # There are transports that can fetch only one head at a time...
 279       case "$remote" in
 280       http://* | https://*)
 281           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 282               curl_extra_args="-k"
 283           fi
 284           max_depth=5
 285           depth=0
 286           head="ref: $remote_name"
 287           while (expr "z$head" : "zref:" && expr $depth \< $max_depth) >/dev/null
 288           do
 289             remote_name_quoted=$(@@PERL@@ -e '
 290               my $u = $ARGV[0];
 291               $u =~ s/^ref:\s*//;
 292               $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
 293               print "$u";
 294           ' "$head")
 295             head=$(curl -nsfL $curl_extra_args "$remote/$remote_name_quoted")
 296             depth=$( expr \( $depth + 1 \) )
 297           done
 298           expr "z$head" : "z$_x40\$" >/dev/null ||
 299               die "Failed to fetch $remote_name from $remote"
 300           echo >&2 Fetching "$remote_name from $remote" using http
 301           git-http-fetch -v -a "$head" "$remote/" || exit
 302           ;;
 303       rsync://*)
 304           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 305           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 306           head=$(git-rev-parse --verify TMP_HEAD)
 307           rm -f "$TMP_HEAD"
 308           test "$rsync_slurped_objects" || {
 309               rsync -av --ignore-existing --exclude info \
 310                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 311
 312               # Look at objects/info/alternates for rsync -- http will
 313               # support it natively and git native ones will do it on
 314               # the remote end.  Not having that file is not a crime.
 315               rsync -q "$remote/objects/info/alternates" \
 316                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 317                   rm -f "$GIT_DIR/TMP_ALT"
 318               if test -f "$GIT_DIR/TMP_ALT"
 319               then
 320                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 321                   while read alt
 322                   do
 323                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 324                       echo >&2 "Getting alternate: $alt"
 325                       rsync -av --ignore-existing --exclude info \
 326                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 327                   done
 328                   rm -f "$GIT_DIR/TMP_ALT"
 329               fi
 330               rsync_slurped_objects=t
 331           }
 332           ;;
 333       *)
 334           # We will do git native transport with just one call later.
 335           continue ;;
 336       esac
 337
 338       append_fetch_head "$head" "$remote" \
 339           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 340
 341   done
 342
 343   case "$remote" in
 344   http://* | https://* | rsync://* )
 345       ;; # we are already done.
 346   *)
 347     ( : subshell because we muck with IFS
 348       IFS="     $LF"
 349       (
 350           git-fetch-pack $exec $keep --thin "$remote" $rref || echo failed "$remote"
 351       ) |
 352       while read sha1 remote_name
 353       do
 354           case "$sha1" in
 355           failed)
 356                   echo >&2 "Fetch failure: $remote"
 357                   exit 1 ;;
 358           esac
 359           found=
 360           single_force=
 361           for ref in $refs
 362           do
 363               case "$ref" in
 364               +$remote_name:*)
 365                   single_force=t
 366                   not_for_merge=
 367                   found="$ref"
 368                   break ;;
 369               .+$remote_name:*)
 370                   single_force=t
 371                   not_for_merge=t
 372                   found="$ref"
 373                   break ;;
 374               .$remote_name:*)
 375                   not_for_merge=t
 376                   found="$ref"
 377                   break ;;
 378               $remote_name:*)
 379                   not_for_merge=
 380                   found="$ref"
 381                   break ;;
 382               esac
 383           done
 384           local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
 385           append_fetch_head "$sha1" "$remote" \
 386                   "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 387       done
 388     ) || exit ;;
 389   esac
 390
 391 }
 392
 393 fetch_main "$reflist"
 394
 395 # automated tag following
 396 case "$no_tags$tags" in
 397 '')
 398         case "$reflist" in
 399         *:refs/*)
 400                 # effective only when we are following remote branch
 401                 # using local tracking branch.
 402                 taglist=$(IFS=" " &&
 403                 git-ls-remote $upload_pack --tags "$remote" |
 404                 sed -ne 's|^\([0-9a-f]*\)[      ]\(refs/tags/.*\)^{}$|\1 \2|p' |
 405                 while read sha1 name
 406                 do
 407                         test -f "$GIT_DIR/$name" && continue
 408                         git-check-ref-format "$name" || {
 409                                 echo >&2 "warning: tag ${name} ignored"
 410                                 continue
 411                         }
 412                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 413                         echo >&2 "Auto-following $name"
 414                         echo ".${name}:${name}"
 415                 done)
 416         esac
 417         case "$taglist" in
 418         '') ;;
 419         ?*)
 420                 fetch_main "$taglist" ;;
 421         esac
 422 esac
 423
 424 # If the original head was empty (i.e. no "master" yet), or
 425 # if we were told not to worry, we do not have to check.
 426 case ",$update_head_ok,$orig_head," in
 427 *,, | t,* )
 428         ;;
 429 *)
 430         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 431         if test "$curr_head" != "$orig_head"
 432         then
 433             git-update-ref \
 434                         -m "$rloga: Undoing incorrectly fetched HEAD." \
 435                         HEAD "$orig_head"
 436                 die "Cannot fetch into the current branch."
 437         fi
 438         ;;
 439 esac