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                   (
 227                         git-ls-remote $upload_pack --tags "$remote" ||
 228                         echo fail ouch
 229                   ) |
 230                   while read sha1 name
 231                   do
 232                         case "$sha1" in
 233                         fail)
 234                                 exit 1
 235                         esac
 236                         case "$name" in
 237                         *^*) continue ;;
 238                         esac
 239                         if git-check-ref-format "$name"
 240                         then
 241                             echo ".${name}:${name}"
 242                         else
 243                             echo >&2 "warning: tag ${name} ignored"
 244                         fi
 245                   done` || exit
 246         if test "$#" -gt 1
 247         then
 248                 # remote URL plus explicit refspecs; we need to merge them.
 249                 reflist="$reflist$LF$taglist"
 250         else
 251                 # No explicit refspecs; fetch tags only.
 252                 reflist=$taglist
 253         fi
 254 fi
 255
 256 fetch_main () {
 257   reflist="$1"
 258   refs=
 259
 260   for ref in $reflist
 261   do
 262       refs="$refs$LF$ref"
 263
 264       # These are relative path from $GIT_DIR, typically starting at refs/
 265       # but may be HEAD
 266       if expr "z$ref" : 'z\.' >/dev/null
 267       then
 268           not_for_merge=t
 269           ref=$(expr "z$ref" : 'z\.\(.*\)')
 270       else
 271           not_for_merge=
 272       fi
 273       if expr "z$ref" : 'z+' >/dev/null
 274       then
 275           single_force=t
 276           ref=$(expr "z$ref" : 'z+\(.*\)')
 277       else
 278           single_force=
 279       fi
 280       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
 281       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 282
 283       rref="$rref$LF$remote_name"
 284
 285       # There are transports that can fetch only one head at a time...
 286       case "$remote" in
 287       http://* | https://*)
 288           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 289               curl_extra_args="-k"
 290           fi
 291           max_depth=5
 292           depth=0
 293           head="ref: $remote_name"
 294           while (expr "z$head" : "zref:" && expr $depth \< $max_depth) >/dev/null
 295           do
 296             remote_name_quoted=$(@@PERL@@ -e '
 297               my $u = $ARGV[0];
 298               $u =~ s/^ref:\s*//;
 299               $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
 300               print "$u";
 301           ' "$head")
 302             head=$(curl -nsfL $curl_extra_args "$remote/$remote_name_quoted")
 303             depth=$( expr \( $depth + 1 \) )
 304           done
 305           expr "z$head" : "z$_x40\$" >/dev/null ||
 306               die "Failed to fetch $remote_name from $remote"
 307           echo >&2 Fetching "$remote_name from $remote" using http
 308           git-http-fetch -v -a "$head" "$remote/" || exit
 309           ;;
 310       rsync://*)
 311           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 312           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 313           head=$(git-rev-parse --verify TMP_HEAD)
 314           rm -f "$TMP_HEAD"
 315           test "$rsync_slurped_objects" || {
 316               rsync -av --ignore-existing --exclude info \
 317                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 318
 319               # Look at objects/info/alternates for rsync -- http will
 320               # support it natively and git native ones will do it on
 321               # the remote end.  Not having that file is not a crime.
 322               rsync -q "$remote/objects/info/alternates" \
 323                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 324                   rm -f "$GIT_DIR/TMP_ALT"
 325               if test -f "$GIT_DIR/TMP_ALT"
 326               then
 327                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 328                   while read alt
 329                   do
 330                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 331                       echo >&2 "Getting alternate: $alt"
 332                       rsync -av --ignore-existing --exclude info \
 333                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 334                   done
 335                   rm -f "$GIT_DIR/TMP_ALT"
 336               fi
 337               rsync_slurped_objects=t
 338           }
 339           ;;
 340       *)
 341           # We will do git native transport with just one call later.
 342           continue ;;
 343       esac
 344
 345       append_fetch_head "$head" "$remote" \
 346           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 347
 348   done
 349
 350   case "$remote" in
 351   http://* | https://* | rsync://* )
 352       ;; # we are already done.
 353   *)
 354     ( : subshell because we muck with IFS
 355       IFS="     $LF"
 356       (
 357           git-fetch-pack $exec $keep --thin "$remote" $rref || echo failed "$remote"
 358       ) |
 359       while read sha1 remote_name
 360       do
 361           case "$sha1" in
 362           failed)
 363                   echo >&2 "Fetch failure: $remote"
 364                   exit 1 ;;
 365           esac
 366           found=
 367           single_force=
 368           for ref in $refs
 369           do
 370               case "$ref" in
 371               +$remote_name:*)
 372                   single_force=t
 373                   not_for_merge=
 374                   found="$ref"
 375                   break ;;
 376               .+$remote_name:*)
 377                   single_force=t
 378                   not_for_merge=t
 379                   found="$ref"
 380                   break ;;
 381               .$remote_name:*)
 382                   not_for_merge=t
 383                   found="$ref"
 384                   break ;;
 385               $remote_name:*)
 386                   not_for_merge=
 387                   found="$ref"
 388                   break ;;
 389               esac
 390           done
 391           local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
 392           append_fetch_head "$sha1" "$remote" \
 393                   "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 394       done
 395     ) || exit ;;
 396   esac
 397
 398 }
 399
 400 fetch_main "$reflist"
 401
 402 # automated tag following
 403 case "$no_tags$tags" in
 404 '')
 405         case "$reflist" in
 406         *:refs/*)
 407                 # effective only when we are following remote branch
 408                 # using local tracking branch.
 409                 taglist=$(IFS=" " &&
 410                 git-ls-remote $upload_pack --tags "$remote" |
 411                 sed -ne 's|^\([0-9a-f]*\)[      ]\(refs/tags/.*\)^{}$|\1 \2|p' |
 412                 while read sha1 name
 413                 do
 414                         test -f "$GIT_DIR/$name" && continue
 415                         git-check-ref-format "$name" || {
 416                                 echo >&2 "warning: tag ${name} ignored"
 417                                 continue
 418                         }
 419                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 420                         echo >&2 "Auto-following $name"
 421                         echo ".${name}:${name}"
 422                 done)
 423         esac
 424         case "$taglist" in
 425         '') ;;
 426         ?*)
 427                 fetch_main "$taglist" ;;
 428         esac
 429 esac
 430
 431 # If the original head was empty (i.e. no "master" yet), or
 432 # if we were told not to worry, we do not have to check.
 433 case ",$update_head_ok,$orig_head," in
 434 *,, | t,* )
 435         ;;
 436 *)
 437         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 438         if test "$curr_head" != "$orig_head"
 439         then
 440             git-update-ref \
 441                         -m "$rloga: Undoing incorrectly fetched HEAD." \
 442                         HEAD "$orig_head"
 443                 die "Cannot fetch into the current branch."
 444         fi
 445         ;;
 446 esac