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