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 "$#" in
  70 0)
  71         test -f "$GIT_DIR/branches/origin" ||
  72                 test -f "$GIT_DIR/remotes/origin" ||
  73                         git-repo-config --get remote.origin.url >/dev/null ||
  74                                 die "Where do you want to fetch from today?"
  75         set origin ;;
  76 esac
  77
  78 remote_nick="$1"
  79 remote=$(get_remote_url "$@")
  80 refs=
  81 rref=
  82 rsync_slurped_objects=
  83
  84 rloga="$rloga $remote_nick"
  85 test "$remote_nick" = "$remote" || rloga="$rloga $remote"
  86
  87 if test "" = "$append"
  88 then
  89         : >"$GIT_DIR/FETCH_HEAD"
  90 fi
  91
  92 append_fetch_head () {
  93     head_="$1"
  94     remote_="$2"
  95     remote_name_="$3"
  96     remote_nick_="$4"
  97     local_name_="$5"
  98     case "$6" in
  99     t) not_for_merge_='not-for-merge' ;;
 100     '') not_for_merge_= ;;
 101     esac
 102
 103     # remote-nick is the URL given on the command line (or a shorthand)
 104     # remote-name is the $GIT_DIR relative refs/ path we computed
 105     # for this refspec.
 106
 107     # the $note_ variable will be fed to git-fmt-merge-msg for further
 108     # processing.
 109     case "$remote_name_" in
 110     HEAD)
 111         note_= ;;
 112     refs/heads/*)
 113         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
 114         note_="branch '$note_' of " ;;
 115     refs/tags/*)
 116         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
 117         note_="tag '$note_' of " ;;
 118     refs/remotes/*)
 119         note_="$(expr "$remote_name_" : 'refs/remotes/\(.*\)')"
 120         note_="remote branch '$note_' of " ;;
 121     *)
 122         note_="$remote_name of " ;;
 123     esac
 124     remote_1_=$(expr "z$remote_" : 'z\(.*\)\.git/*$') &&
 125         remote_="$remote_1_"
 126     note_="$note_$remote_"
 127
 128     # 2.6.11-tree tag would not be happy to be fed to resolve.
 129     if git-cat-file commit "$head_" >/dev/null 2>&1
 130     then
 131         headc_=$(git-rev-parse --verify "$head_^0") || exit
 132         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
 133         [ "$verbose" ] && echo >&2 "* committish: $head_"
 134         [ "$verbose" ] && echo >&2 "  $note_"
 135     else
 136         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
 137         [ "$verbose" ] && echo >&2 "* non-commit: $head_"
 138         [ "$verbose" ] && echo >&2 "  $note_"
 139     fi
 140     if test "$local_name_" != ""
 141     then
 142         # We are storing the head locally.  Make sure that it is
 143         # a fast forward (aka "reverse push").
 144         fast_forward_local "$local_name_" "$head_" "$note_"
 145     fi
 146 }
 147
 148 fast_forward_local () {
 149     mkdir -p "$(dirname "$GIT_DIR/$1")"
 150     case "$1" in
 151     refs/tags/*)
 152         # Tags need not be pointing at commits so there
 153         # is no way to guarantee "fast-forward" anyway.
 154         if test -f "$GIT_DIR/$1"
 155         then
 156                 if now_=$(cat "$GIT_DIR/$1") && test "$now_" = "$2"
 157                 then
 158                         [ "$verbose" ] && echo >&2 "* $1: same as $3" ||:
 159                 else
 160                         echo >&2 "* $1: updating with $3"
 161                         git-update-ref -m "$rloga: updating tag" "$1" "$2"
 162                 fi
 163         else
 164                 echo >&2 "* $1: storing $3"
 165                 git-update-ref -m "$rloga: storing tag" "$1" "$2"
 166         fi
 167         ;;
 168
 169     refs/heads/* | refs/remotes/*)
 170         # $1 is the ref being updated.
 171         # $2 is the new value for the ref.
 172         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
 173         if test "$local"
 174         then
 175             # Require fast-forward.
 176             mb=$(git-merge-base "$local" "$2") &&
 177             case "$2,$mb" in
 178             $local,*)
 179                 if test -n "$verbose"
 180                 then
 181                         echo >&2 "* $1: same as $3"
 182                 fi
 183                 ;;
 184             *,$local)
 185                 echo >&2 "* $1: fast forward to $3"
 186                 echo >&2 "  from $local to $2"
 187                 git-update-ref -m "$rloga: fast-forward" "$1" "$2" "$local"
 188                 ;;
 189             *)
 190                 false
 191                 ;;
 192             esac || {
 193                 echo >&2 "* $1: does not fast forward to $3;"
 194                 case ",$force,$single_force," in
 195                 *,t,*)
 196                         echo >&2 "  forcing update."
 197                         git-update-ref -m "$rloga: forced-update" "$1" "$2" "$local"
 198                         ;;
 199                 *)
 200                         echo >&2 "  not updating."
 201                         exit 1
 202                         ;;
 203                 esac
 204             }
 205         else
 206             echo >&2 "* $1: storing $3"
 207             git-update-ref -m "$rloga: storing head" "$1" "$2"
 208         fi
 209         ;;
 210     esac
 211 }
 212
 213 case "$update_head_ok" in
 214 '')
 215         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 216         ;;
 217 esac
 218
 219 # If --tags (and later --heads or --all) is specified, then we are
 220 # not talking about defaults stored in Pull: line of remotes or
 221 # branches file, and just fetch those and refspecs explicitly given.
 222 # Otherwise we do what we always did.
 223
 224 reflist=$(get_remote_refs_for_fetch "$@")
 225 if test "$tags"
 226 then
 227         taglist=`IFS="  " &&
 228                   (
 229                         git-ls-remote $upload_pack --tags "$remote" ||
 230                         echo fail ouch
 231                   ) |
 232                   while read sha1 name
 233                   do
 234                         case "$sha1" in
 235                         fail)
 236                                 exit 1
 237                         esac
 238                         case "$name" in
 239                         *^*) continue ;;
 240                         esac
 241                         if git-check-ref-format "$name"
 242                         then
 243                             echo ".${name}:${name}"
 244                         else
 245                             echo >&2 "warning: tag ${name} ignored"
 246                         fi
 247                   done` || exit
 248         if test "$#" -gt 1
 249         then
 250                 # remote URL plus explicit refspecs; we need to merge them.
 251                 reflist="$reflist$LF$taglist"
 252         else
 253                 # No explicit refspecs; fetch tags only.
 254                 reflist=$taglist
 255         fi
 256 fi
 257
 258 fetch_main () {
 259   reflist="$1"
 260   refs=
 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://*)
 290           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 291               curl_extra_args="-k"
 292           fi
 293           max_depth=5
 294           depth=0
 295           head="ref: $remote_name"
 296           while (expr "z$head" : "zref:" && expr $depth \< $max_depth) >/dev/null
 297           do
 298             remote_name_quoted=$(@@PERL@@ -e '
 299               my $u = $ARGV[0];
 300               $u =~ s/^ref:\s*//;
 301               $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
 302               print "$u";
 303           ' "$head")
 304             head=$(curl -nsfL $curl_extra_args "$remote/$remote_name_quoted")
 305             depth=$( expr \( $depth + 1 \) )
 306           done
 307           expr "z$head" : "z$_x40\$" >/dev/null ||
 308               die "Failed to fetch $remote_name from $remote"
 309           echo >&2 Fetching "$remote_name from $remote" using http
 310           git-http-fetch -v -a "$head" "$remote/" || exit
 311           ;;
 312       rsync://*)
 313           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 314           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 315           head=$(git-rev-parse --verify TMP_HEAD)
 316           rm -f "$TMP_HEAD"
 317           test "$rsync_slurped_objects" || {
 318               rsync -av --ignore-existing --exclude info \
 319                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 320
 321               # Look at objects/info/alternates for rsync -- http will
 322               # support it natively and git native ones will do it on
 323               # the remote end.  Not having that file is not a crime.
 324               rsync -q "$remote/objects/info/alternates" \
 325                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 326                   rm -f "$GIT_DIR/TMP_ALT"
 327               if test -f "$GIT_DIR/TMP_ALT"
 328               then
 329                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 330                   while read alt
 331                   do
 332                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 333                       echo >&2 "Getting alternate: $alt"
 334                       rsync -av --ignore-existing --exclude info \
 335                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 336                   done
 337                   rm -f "$GIT_DIR/TMP_ALT"
 338               fi
 339               rsync_slurped_objects=t
 340           }
 341           ;;
 342       *)
 343           # We will do git native transport with just one call later.
 344           continue ;;
 345       esac
 346
 347       append_fetch_head "$head" "$remote" \
 348           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 349
 350   done
 351
 352   case "$remote" in
 353   http://* | https://* | rsync://* )
 354       ;; # we are already done.
 355   *)
 356     ( : subshell because we muck with IFS
 357       IFS="     $LF"
 358       (
 359           git-fetch-pack $exec $keep "$remote" $rref || echo failed "$remote"
 360       ) |
 361       while read sha1 remote_name
 362       do
 363           case "$sha1" in
 364           failed)
 365                   echo >&2 "Fetch failure: $remote"
 366                   exit 1 ;;
 367           esac
 368           found=
 369           single_force=
 370           for ref in $refs
 371           do
 372               case "$ref" in
 373               +$remote_name:*)
 374                   single_force=t
 375                   not_for_merge=
 376                   found="$ref"
 377                   break ;;
 378               .+$remote_name:*)
 379                   single_force=t
 380                   not_for_merge=t
 381                   found="$ref"
 382                   break ;;
 383               .$remote_name:*)
 384                   not_for_merge=t
 385                   found="$ref"
 386                   break ;;
 387               $remote_name:*)
 388                   not_for_merge=
 389                   found="$ref"
 390                   break ;;
 391               esac
 392           done
 393           local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
 394           append_fetch_head "$sha1" "$remote" \
 395                   "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 396       done
 397     ) || exit ;;
 398   esac
 399
 400 }
 401
 402 fetch_main "$reflist"
 403
 404 # automated tag following
 405 case "$no_tags$tags" in
 406 '')
 407         case "$reflist" in
 408         *:refs/*)
 409                 # effective only when we are following remote branch
 410                 # using local tracking branch.
 411                 taglist=$(IFS=" " &&
 412                 git-ls-remote $upload_pack --tags "$remote" |
 413                 sed -ne 's|^\([0-9a-f]*\)[      ]\(refs/tags/.*\)^{}$|\1 \2|p' |
 414                 while read sha1 name
 415                 do
 416                         test -f "$GIT_DIR/$name" && continue
 417                         git-check-ref-format "$name" || {
 418                                 echo >&2 "warning: tag ${name} ignored"
 419                                 continue
 420                         }
 421                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 422                         echo >&2 "Auto-following $name"
 423                         echo ".${name}:${name}"
 424                 done)
 425         esac
 426         case "$taglist" in
 427         '') ;;
 428         ?*)
 429                 fetch_main "$taglist" ;;
 430         esac
 431 esac
 432
 433 # If the original head was empty (i.e. no "master" yet), or
 434 # if we were told not to worry, we do not have to check.
 435 case ",$update_head_ok,$orig_head," in
 436 *,, | t,* )
 437         ;;
 438 *)
 439         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 440         if test "$curr_head" != "$orig_head"
 441         then
 442             git-update-ref \
 443                         -m "$rloga: Undoing incorrectly fetched HEAD." \
 444                         HEAD "$orig_head"
 445                 die "Cannot fetch into the current branch."
 446         fi
 447         ;;
 448 esac