git-submodule.sh

   1 #!/bin/sh
   2 #
   3 # git-submodules.sh: add, init, update or list git submodules
   4 #
   5 # Copyright (c) 2007 Lars Hjemli
   6
   7 dashless=$(basename "$0" | sed -e 's/-/ /')
   8 USAGE="[--quiet] add [-b branch] [--reference <repository>] [--] <repository> [<path>]
   9    or: $dashless [--quiet] status [--cached] [--recursive] [--] [<path>...]
  10    or: $dashless [--quiet] init [--] [<path>...]
  11    or: $dashless [--quiet] update [--init] [-N|--no-fetch] [--rebase] [--reference <repository>] [--merge] [--recursive] [--] [<path>...]
  12    or: $dashless [--quiet] summary [--cached|--files] [--summary-limit <n>] [commit] [--] [<path>...]
  13    or: $dashless [--quiet] foreach [--recursive] <command>
  14    or: $dashless [--quiet] sync [--] [<path>...]"
  15 OPTIONS_SPEC=
  16 . git-sh-setup
  17 . git-parse-remote
  18 require_work_tree
  19
  20 command=
  21 branch=
  22 reference=
  23 cached=
  24 recursive=
  25 init=
  26 files=
  27 nofetch=
  28 update=
  29 prefix=
  30
  31 # Resolve relative url by appending to parent's url
  32 resolve_relative_url ()
  33 {
  34         remote=$(get_default_remote)
  35         remoteurl=$(git config "remote.$remote.url") ||
  36                 die "remote ($remote) does not have a url defined in .git/config"
  37         url="$1"
  38         remoteurl=${remoteurl%/}
  39         sep=/
  40         while test -n "$url"
  41         do
  42                 case "$url" in
  43                 ../*)
  44                         url="${url#../}"
  45                         case "$remoteurl" in
  46                         */*)
  47                                 remoteurl="${remoteurl%/*}"
  48                                 ;;
  49                         *:*)
  50                                 remoteurl="${remoteurl%:*}"
  51                                 sep=:
  52                                 ;;
  53                         *)
  54                                 die "cannot strip one component off url '$remoteurl'"
  55                                 ;;
  56                         esac
  57                         ;;
  58                 ./*)
  59                         url="${url#./}"
  60                         ;;
  61                 *)
  62                         break;;
  63                 esac
  64         done
  65         echo "$remoteurl$sep${url%/}"
  66 }
  67
  68 #
  69 # Get submodule info for registered submodules
  70 # $@ = path to limit submodule list
  71 #
  72 module_list()
  73 {
  74         git ls-files --error-unmatch --stage -- "$@" | sane_grep '^160000 '
  75 }
  76
  77 #
  78 # Map submodule path to submodule name
  79 #
  80 # $1 = path
  81 #
  82 module_name()
  83 {
  84         # Do we have "submodule.<something>.path = $1" defined in .gitmodules file?
  85         re=$(printf '%s\n' "$1" | sed -e 's/[].[^$\\*]/\\&/g')
  86         name=$( git config -f .gitmodules --get-regexp '^submodule\..*\.path$' |
  87                 sed -n -e 's|^submodule\.\(.*\)\.path '"$re"'$|\1|p' )
  88        test -z "$name" &&
  89        die "No submodule mapping found in .gitmodules for path '$path'"
  90        echo "$name"
  91 }
  92
  93 #
  94 # Clone a submodule
  95 #
  96 # Prior to calling, cmd_update checks that a possibly existing
  97 # path is not a git repository.
  98 # Likewise, cmd_add checks that path does not exist at all,
  99 # since it is the location of a new submodule.
 100 #
 101 module_clone()
 102 {
 103         path=$1
 104         url=$2
 105         reference="$3"
 106
 107         # If there already is a directory at the submodule path,
 108         # expect it to be empty (since that is the default checkout
 109         # action) and try to remove it.
 110         # Note: if $path is a symlink to a directory the test will
 111         # succeed but the rmdir will fail. We might want to fix this.
 112         if test -d "$path"
 113         then
 114                 rmdir "$path" 2>/dev/null ||
 115                 die "Directory '$path' exists, but is neither empty nor a git repository"
 116         fi
 117
 118         test -e "$path" &&
 119         die "A file already exist at path '$path'"
 120
 121         if test -n "$reference"
 122         then
 123                 git-clone "$reference" -n "$url" "$path"
 124         else
 125                 git-clone -n "$url" "$path"
 126         fi ||
 127         die "Clone of '$url' into submodule path '$path' failed"
 128 }
 129
 130 #
 131 # Add a new submodule to the working tree, .gitmodules and the index
 132 #
 133 # $@ = repo path
 134 #
 135 # optional branch is stored in global branch variable
 136 #
 137 cmd_add()
 138 {
 139         # parse $args after "submodule ... add".
 140         while test $# -ne 0
 141         do
 142                 case "$1" in
 143                 -b | --branch)
 144                         case "$2" in '') usage ;; esac
 145                         branch=$2
 146                         shift
 147                         ;;
 148                 -q|--quiet)
 149                         GIT_QUIET=1
 150                         ;;
 151                 --reference)
 152                         case "$2" in '') usage ;; esac
 153                         reference="--reference=$2"
 154                         shift
 155                         ;;
 156                 --reference=*)
 157                         reference="$1"
 158                         shift
 159                         ;;
 160                 --)
 161                         shift
 162                         break
 163                         ;;
 164                 -*)
 165                         usage
 166                         ;;
 167                 *)
 168                         break
 169                         ;;
 170                 esac
 171                 shift
 172         done
 173
 174         repo=$1
 175         path=$2
 176
 177         if test -z "$path"; then
 178                 path=$(echo "$repo" |
 179                         sed -e 's|/$||' -e 's|:*/*\.git$||' -e 's|.*[/:]||g')
 180         fi
 181
 182         if test -z "$repo" -o -z "$path"; then
 183                 usage
 184         fi
 185
 186         # assure repo is absolute or relative to parent
 187         case "$repo" in
 188         ./*|../*)
 189                 # dereference source url relative to parent's url
 190                 realrepo=$(resolve_relative_url "$repo") || exit
 191                 ;;
 192         *:*|/*)
 193                 # absolute url
 194                 realrepo=$repo
 195                 ;;
 196         *)
 197                 die "repo URL: '$repo' must be absolute or begin with ./|../"
 198         ;;
 199         esac
 200
 201         # normalize path:
 202         # multiple //; leading ./; /./; /../; trailing /
 203         path=$(printf '%s/\n' "$path" |
 204                 sed -e '
 205                         s|//*|/|g
 206                         s|^\(\./\)*||
 207                         s|/\./|/|g
 208                         :start
 209                         s|\([^/]*\)/\.\./||
 210                         tstart
 211                         s|/*$||
 212                 ')
 213         git ls-files --error-unmatch "$path" > /dev/null 2>&1 &&
 214         die "'$path' already exists in the index"
 215
 216         # perhaps the path exists and is already a git repo, else clone it
 217         if test -e "$path"
 218         then
 219                 if test -d "$path"/.git -o -f "$path"/.git
 220                 then
 221                         echo "Adding existing repo at '$path' to the index"
 222                 else
 223                         die "'$path' already exists and is not a valid git repo"
 224                 fi
 225
 226                 case "$repo" in
 227                 ./*|../*)
 228                         url=$(resolve_relative_url "$repo") || exit
 229                     ;;
 230                 *)
 231                         url="$repo"
 232                         ;;
 233                 esac
 234                 git config submodule."$path".url "$url"
 235         else
 236
 237                 module_clone "$path" "$realrepo" "$reference" || exit
 238                 (
 239                         clear_local_git_env
 240                         cd "$path" &&
 241                         # ash fails to wordsplit ${branch:+-b "$branch"...}
 242                         case "$branch" in
 243                         '') git checkout -f -q ;;
 244                         ?*) git checkout -f -q -b "$branch" "origin/$branch" ;;
 245                         esac
 246                 ) || die "Unable to checkout submodule '$path'"
 247         fi
 248
 249         git add "$path" ||
 250         die "Failed to add submodule '$path'"
 251
 252         git config -f .gitmodules submodule."$path".path "$path" &&
 253         git config -f .gitmodules submodule."$path".url "$repo" &&
 254         git add .gitmodules ||
 255         die "Failed to register submodule '$path'"
 256 }
 257
 258 #
 259 # Execute an arbitrary command sequence in each checked out
 260 # submodule
 261 #
 262 # $@ = command to execute
 263 #
 264 cmd_foreach()
 265 {
 266         # parse $args after "submodule ... foreach".
 267         while test $# -ne 0
 268         do
 269                 case "$1" in
 270                 -q|--quiet)
 271                         GIT_QUIET=1
 272                         ;;
 273                 --recursive)
 274                         recursive=1
 275                         ;;
 276                 -*)
 277                         usage
 278                         ;;
 279                 *)
 280                         break
 281                         ;;
 282                 esac
 283                 shift
 284         done
 285
 286         module_list |
 287         while read mode sha1 stage path
 288         do
 289                 if test -e "$path"/.git
 290                 then
 291                         say "Entering '$prefix$path'"
 292                         name=$(module_name "$path")
 293                         (
 294                                 prefix="$prefix$path/"
 295                                 clear_local_git_env
 296                                 cd "$path" &&
 297                                 eval "$@" &&
 298                                 if test -n "$recursive"
 299                                 then
 300                                         cmd_foreach "--recursive" "$@"
 301                                 fi
 302                         ) ||
 303                         die "Stopping at '$path'; script returned non-zero status."
 304                 fi
 305         done
 306 }
 307
 308 #
 309 # Register submodules in .git/config
 310 #
 311 # $@ = requested paths (default to all)
 312 #
 313 cmd_init()
 314 {
 315         # parse $args after "submodule ... init".
 316         while test $# -ne 0
 317         do
 318                 case "$1" in
 319                 -q|--quiet)
 320                         GIT_QUIET=1
 321                         ;;
 322                 --)
 323                         shift
 324                         break
 325                         ;;
 326                 -*)
 327                         usage
 328                         ;;
 329                 *)
 330                         break
 331                         ;;
 332                 esac
 333                 shift
 334         done
 335
 336         module_list "$@" |
 337         while read mode sha1 stage path
 338         do
 339                 # Skip already registered paths
 340                 name=$(module_name "$path") || exit
 341                 url=$(git config submodule."$name".url)
 342                 test -z "$url" || continue
 343
 344                 url=$(git config -f .gitmodules submodule."$name".url)
 345                 test -z "$url" &&
 346                 die "No url found for submodule path '$path' in .gitmodules"
 347
 348                 # Possibly a url relative to parent
 349                 case "$url" in
 350                 ./*|../*)
 351                         url=$(resolve_relative_url "$url") || exit
 352                         ;;
 353                 esac
 354
 355                 git config submodule."$name".url "$url" ||
 356                 die "Failed to register url for submodule path '$path'"
 357
 358                 upd="$(git config -f .gitmodules submodule."$name".update)"
 359                 test -z "$upd" ||
 360                 git config submodule."$name".update "$upd" ||
 361                 die "Failed to register update mode for submodule path '$path'"
 362
 363                 say "Submodule '$name' ($url) registered for path '$path'"
 364         done
 365 }
 366
 367 #
 368 # Update each submodule path to correct revision, using clone and checkout as needed
 369 #
 370 # $@ = requested paths (default to all)
 371 #
 372 cmd_update()
 373 {
 374         # parse $args after "submodule ... update".
 375         orig_args="$@"
 376         while test $# -ne 0
 377         do
 378                 case "$1" in
 379                 -q|--quiet)
 380                         shift
 381                         GIT_QUIET=1
 382                         ;;
 383                 -i|--init)
 384                         init=1
 385                         shift
 386                         ;;
 387                 -N|--no-fetch)
 388                         shift
 389                         nofetch=1
 390                         ;;
 391                 -r|--rebase)
 392                         shift
 393                         update="rebase"
 394                         ;;
 395                 --reference)
 396                         case "$2" in '') usage ;; esac
 397                         reference="--reference=$2"
 398                         shift 2
 399                         ;;
 400                 --reference=*)
 401                         reference="$1"
 402                         shift
 403                         ;;
 404                 -m|--merge)
 405                         shift
 406                         update="merge"
 407                         ;;
 408                 --recursive)
 409                         shift
 410                         recursive=1
 411                         ;;
 412                 --)
 413                         shift
 414                         break
 415                         ;;
 416                 -*)
 417                         usage
 418                         ;;
 419                 *)
 420                         break
 421                         ;;
 422                 esac
 423         done
 424
 425         if test -n "$init"
 426         then
 427                 cmd_init "--" "$@" || return
 428         fi
 429
 430         module_list "$@" |
 431         while read mode sha1 stage path
 432         do
 433                 name=$(module_name "$path") || exit
 434                 url=$(git config submodule."$name".url)
 435                 update_module=$(git config submodule."$name".update)
 436                 if test -z "$url"
 437                 then
 438                         # Only mention uninitialized submodules when its
 439                         # path have been specified
 440                         test "$#" != "0" &&
 441                         say "Submodule path '$path' not initialized" &&
 442                         say "Maybe you want to use 'update --init'?"
 443                         continue
 444                 fi
 445
 446                 if ! test -d "$path"/.git -o -f "$path"/.git
 447                 then
 448                         module_clone "$path" "$url" "$reference"|| exit
 449                         subsha1=
 450                 else
 451                         subsha1=$(clear_local_git_env; cd "$path" &&
 452                                 git rev-parse --verify HEAD) ||
 453                         die "Unable to find current revision in submodule path '$path'"
 454                 fi
 455
 456                 if ! test -z "$update"
 457                 then
 458                         update_module=$update
 459                 fi
 460
 461                 if test "$subsha1" != "$sha1"
 462                 then
 463                         force=
 464                         if test -z "$subsha1"
 465                         then
 466                                 force="-f"
 467                         fi
 468
 469                         if test -z "$nofetch"
 470                         then
 471                                 (clear_local_git_env; cd "$path" &&
 472                                         git-fetch) ||
 473                                 die "Unable to fetch in submodule path '$path'"
 474                         fi
 475
 476                         case "$update_module" in
 477                         rebase)
 478                                 command="git rebase"
 479                                 action="rebase"
 480                                 msg="rebased onto"
 481                                 ;;
 482                         merge)
 483                                 command="git merge"
 484                                 action="merge"
 485                                 msg="merged in"
 486                                 ;;
 487                         *)
 488                                 command="git checkout $force -q"
 489                                 action="checkout"
 490                                 msg="checked out"
 491                                 ;;
 492                         esac
 493
 494                         (clear_local_git_env; cd "$path" && $command "$sha1") ||
 495                         die "Unable to $action '$sha1' in submodule path '$path'"
 496                         say "Submodule path '$path': $msg '$sha1'"
 497                 fi
 498
 499                 if test -n "$recursive"
 500                 then
 501                         (clear_local_git_env; cd "$path" && cmd_update $orig_args) ||
 502                         die "Failed to recurse into submodule path '$path'"
 503                 fi
 504         done
 505 }
 506
 507 set_name_rev () {
 508         revname=$( (
 509                 clear_local_git_env
 510                 cd "$1" && {
 511                         git describe "$2" 2>/dev/null ||
 512                         git describe --tags "$2" 2>/dev/null ||
 513                         git describe --contains "$2" 2>/dev/null ||
 514                         git describe --all --always "$2"
 515                 }
 516         ) )
 517         test -z "$revname" || revname=" ($revname)"
 518 }
 519 #
 520 # Show commit summary for submodules in index or working tree
 521 #
 522 # If '--cached' is given, show summary between index and given commit,
 523 # or between working tree and given commit
 524 #
 525 # $@ = [commit (default 'HEAD'),] requested paths (default all)
 526 #
 527 cmd_summary() {
 528         summary_limit=-1
 529         for_status=
 530         diff_cmd=diff-index
 531
 532         # parse $args after "submodule ... summary".
 533         while test $# -ne 0
 534         do
 535                 case "$1" in
 536                 --cached)
 537                         cached="$1"
 538                         ;;
 539                 --files)
 540                         files="$1"
 541                         ;;
 542                 --for-status)
 543                         for_status="$1"
 544                         ;;
 545                 -n|--summary-limit)
 546                         if summary_limit=$(($2 + 0)) 2>/dev/null && test "$summary_limit" = "$2"
 547                         then
 548                                 :
 549                         else
 550                                 usage
 551                         fi
 552                         shift
 553                         ;;
 554                 --)
 555                         shift
 556                         break
 557                         ;;
 558                 -*)
 559                         usage
 560                         ;;
 561                 *)
 562                         break
 563                         ;;
 564                 esac
 565                 shift
 566         done
 567
 568         test $summary_limit = 0 && return
 569
 570         if rev=$(git rev-parse -q --verify "$1^0")
 571         then
 572                 head=$rev
 573                 shift
 574         else
 575                 head=HEAD
 576         fi
 577
 578         if [ -n "$files" ]
 579         then
 580                 test -n "$cached" &&
 581                 die "--cached cannot be used with --files"
 582                 diff_cmd=diff-files
 583                 head=
 584         fi
 585
 586         cd_to_toplevel
 587         # Get modified modules cared by user
 588         modules=$(git $diff_cmd $cached --raw $head -- "$@" |
 589                 sane_egrep '^:([0-7]* )?160000' |
 590                 while read mod_src mod_dst sha1_src sha1_dst status name
 591                 do
 592                         # Always show modules deleted or type-changed (blob<->module)
 593                         test $status = D -o $status = T && echo "$name" && continue
 594                         # Also show added or modified modules which are checked out
 595                         GIT_DIR="$name/.git" git-rev-parse --git-dir >/dev/null 2>&1 &&
 596                         echo "$name"
 597                 done
 598         )
 599
 600         test -z "$modules" && return
 601
 602         git $diff_cmd $cached --raw $head -- $modules |
 603         sane_egrep '^:([0-7]* )?160000' |
 604         cut -c2- |
 605         while read mod_src mod_dst sha1_src sha1_dst status name
 606         do
 607                 if test -z "$cached" &&
 608                         test $sha1_dst = 0000000000000000000000000000000000000000
 609                 then
 610                         case "$mod_dst" in
 611                         160000)
 612                                 sha1_dst=$(GIT_DIR="$name/.git" git rev-parse HEAD)
 613                                 ;;
 614                         100644 | 100755 | 120000)
 615                                 sha1_dst=$(git hash-object $name)
 616                                 ;;
 617                         000000)
 618                                 ;; # removed
 619                         *)
 620                                 # unexpected type
 621                                 echo >&2 "unexpected mode $mod_dst"
 622                                 continue ;;
 623                         esac
 624                 fi
 625                 missing_src=
 626                 missing_dst=
 627
 628                 test $mod_src = 160000 &&
 629                 ! GIT_DIR="$name/.git" git-rev-parse -q --verify $sha1_src^0 >/dev/null &&
 630                 missing_src=t
 631
 632                 test $mod_dst = 160000 &&
 633                 ! GIT_DIR="$name/.git" git-rev-parse -q --verify $sha1_dst^0 >/dev/null &&
 634                 missing_dst=t
 635
 636                 total_commits=
 637                 case "$missing_src,$missing_dst" in
 638                 t,)
 639                         errmsg="  Warn: $name doesn't contain commit $sha1_src"
 640                         ;;
 641                 ,t)
 642                         errmsg="  Warn: $name doesn't contain commit $sha1_dst"
 643                         ;;
 644                 t,t)
 645                         errmsg="  Warn: $name doesn't contain commits $sha1_src and $sha1_dst"
 646                         ;;
 647                 *)
 648                         errmsg=
 649                         total_commits=$(
 650                         if test $mod_src = 160000 -a $mod_dst = 160000
 651                         then
 652                                 range="$sha1_src...$sha1_dst"
 653                         elif test $mod_src = 160000
 654                         then
 655                                 range=$sha1_src
 656                         else
 657                                 range=$sha1_dst
 658                         fi
 659                         GIT_DIR="$name/.git" \
 660                         git log --pretty=oneline --first-parent $range | wc -l
 661                         )
 662                         total_commits=" ($(($total_commits + 0)))"
 663                         ;;
 664                 esac
 665
 666                 sha1_abbr_src=$(echo $sha1_src | cut -c1-7)
 667                 sha1_abbr_dst=$(echo $sha1_dst | cut -c1-7)
 668                 if test $status = T
 669                 then
 670                         if test $mod_dst = 160000
 671                         then
 672                                 echo "* $name $sha1_abbr_src(blob)->$sha1_abbr_dst(submodule)$total_commits:"
 673                         else
 674                                 echo "* $name $sha1_abbr_src(submodule)->$sha1_abbr_dst(blob)$total_commits:"
 675                         fi
 676                 else
 677                         echo "* $name $sha1_abbr_src...$sha1_abbr_dst$total_commits:"
 678                 fi
 679                 if test -n "$errmsg"
 680                 then
 681                         # Don't give error msg for modification whose dst is not submodule
 682                         # i.e. deleted or changed to blob
 683                         test $mod_dst = 160000 && echo "$errmsg"
 684                 else
 685                         if test $mod_src = 160000 -a $mod_dst = 160000
 686                         then
 687                                 limit=
 688                                 test $summary_limit -gt 0 && limit="-$summary_limit"
 689                                 GIT_DIR="$name/.git" \
 690                                 git log $limit --pretty='format:  %m %s' \
 691                                 --first-parent $sha1_src...$sha1_dst
 692                         elif test $mod_dst = 160000
 693                         then
 694                                 GIT_DIR="$name/.git" \
 695                                 git log --pretty='format:  > %s' -1 $sha1_dst
 696                         else
 697                                 GIT_DIR="$name/.git" \
 698                                 git log --pretty='format:  < %s' -1 $sha1_src
 699                         fi
 700                         echo
 701                 fi
 702                 echo
 703         done |
 704         if test -n "$for_status"; then
 705                 if [ -n "$files" ]; then
 706                         echo "# Submodules changed but not updated:"
 707                 else
 708                         echo "# Submodule changes to be committed:"
 709                 fi
 710                 echo "#"
 711                 sed -e 's|^|# |' -e 's|^# $|#|'
 712         else
 713                 cat
 714         fi
 715 }
 716 #
 717 # List all submodules, prefixed with:
 718 #  - submodule not initialized
 719 #  + different revision checked out
 720 #
 721 # If --cached was specified the revision in the index will be printed
 722 # instead of the currently checked out revision.
 723 #
 724 # $@ = requested paths (default to all)
 725 #
 726 cmd_status()
 727 {
 728         # parse $args after "submodule ... status".
 729         orig_args="$@"
 730         while test $# -ne 0
 731         do
 732                 case "$1" in
 733                 -q|--quiet)
 734                         GIT_QUIET=1
 735                         ;;
 736                 --cached)
 737                         cached=1
 738                         ;;
 739                 --recursive)
 740                         recursive=1
 741                         ;;
 742                 --)
 743                         shift
 744                         break
 745                         ;;
 746                 -*)
 747                         usage
 748                         ;;
 749                 *)
 750                         break
 751                         ;;
 752                 esac
 753                 shift
 754         done
 755
 756         module_list "$@" |
 757         while read mode sha1 stage path
 758         do
 759                 name=$(module_name "$path") || exit
 760                 url=$(git config submodule."$name".url)
 761                 displaypath="$prefix$path"
 762                 if test -z "$url" || ! test -d "$path"/.git -o -f "$path"/.git
 763                 then
 764                         say "-$sha1 $displaypath"
 765                         continue;
 766                 fi
 767                 set_name_rev "$path" "$sha1"
 768                 if git diff-files --quiet -- "$path"
 769                 then
 770                         say " $sha1 $displaypath$revname"
 771                 else
 772                         if test -z "$cached"
 773                         then
 774                                 sha1=$(clear_local_git_env; cd "$path" && git rev-parse --verify HEAD)
 775                                 set_name_rev "$path" "$sha1"
 776                         fi
 777                         say "+$sha1 $displaypath$revname"
 778                 fi
 779
 780                 if test -n "$recursive"
 781                 then
 782                         (
 783                                 prefix="$displaypath/"
 784                                 clear_local_git_env
 785                                 cd "$path" &&
 786                                 cmd_status $orig_args
 787                         ) ||
 788                         die "Failed to recurse into submodule path '$path'"
 789                 fi
 790         done
 791 }
 792 #
 793 # Sync remote urls for submodules
 794 # This makes the value for remote.$remote.url match the value
 795 # specified in .gitmodules.
 796 #
 797 cmd_sync()
 798 {
 799         while test $# -ne 0
 800         do
 801                 case "$1" in
 802                 -q|--quiet)
 803                         GIT_QUIET=1
 804                         shift
 805                         ;;
 806                 --)
 807                         shift
 808                         break
 809                         ;;
 810                 -*)
 811                         usage
 812                         ;;
 813                 *)
 814                         break
 815                         ;;
 816                 esac
 817         done
 818         cd_to_toplevel
 819         module_list "$@" |
 820         while read mode sha1 stage path
 821         do
 822                 name=$(module_name "$path")
 823                 url=$(git config -f .gitmodules --get submodule."$name".url)
 824
 825                 # Possibly a url relative to parent
 826                 case "$url" in
 827                 ./*|../*)
 828                         url=$(resolve_relative_url "$url") || exit
 829                         ;;
 830                 esac
 831
 832                 if test -e "$path"/.git
 833                 then
 834                 (
 835                         clear_local_git_env
 836                         cd "$path"
 837                         remote=$(get_default_remote)
 838                         say "Synchronizing submodule url for '$name'"
 839                         git config remote."$remote".url "$url"
 840                 )
 841                 fi
 842         done
 843 }
 844
 845 # This loop parses the command line arguments to find the
 846 # subcommand name to dispatch.  Parsing of the subcommand specific
 847 # options are primarily done by the subcommand implementations.
 848 # Subcommand specific options such as --branch and --cached are
 849 # parsed here as well, for backward compatibility.
 850
 851 while test $# != 0 && test -z "$command"
 852 do
 853         case "$1" in
 854         add | foreach | init | update | status | summary | sync)
 855                 command=$1
 856                 ;;
 857         -q|--quiet)
 858                 GIT_QUIET=1
 859                 ;;
 860         -b|--branch)
 861                 case "$2" in
 862                 '')
 863                         usage
 864                         ;;
 865                 esac
 866                 branch="$2"; shift
 867                 ;;
 868         --cached)
 869                 cached="$1"
 870                 ;;
 871         --)
 872                 break
 873                 ;;
 874         -*)
 875                 usage
 876                 ;;
 877         *)
 878                 break
 879                 ;;
 880         esac
 881         shift
 882 done
 883
 884 # No command word defaults to "status"
 885 test -n "$command" || command=status
 886
 887 # "-b branch" is accepted only by "add"
 888 if test -n "$branch" && test "$command" != add
 889 then
 890         usage
 891 fi
 892
 893 # "--cached" is accepted only by "status" and "summary"
 894 if test -n "$cached" && test "$command" != status -a "$command" != summary
 895 then
 896         usage
 897 fi
 898
 899 "cmd_$command" "$@"