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