git-submodule.sh

   1 #!/bin/sh
   2 #
   3 # git-submodule.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>] [-f|--force] [--name <name>] [--reference <repository>] [--] <repository> [<path>]
   9    or: $dashless [--quiet] status [--cached] [--recursive] [--] [<path>...]
  10    or: $dashless [--quiet] init [--] [<path>...]
  11    or: $dashless [--quiet] deinit [-f|--force] (--all| [--] <path>...)
  12    or: $dashless [--quiet] update [--init] [--remote] [-N|--no-fetch] [-f|--force] [--checkout|--merge|--rebase] [--[no-]recommend-shallow] [--reference <repository>] [--recursive] [--] [<path>...]
  13    or: $dashless [--quiet] summary [--cached|--files] [--summary-limit <n>] [commit] [--] [<path>...]
  14    or: $dashless [--quiet] foreach [--recursive] <command>
  15    or: $dashless [--quiet] sync [--recursive] [--] [<path>...]
  16    or: $dashless [--quiet] absorbgitdirs [--] [<path>...]"
  17 OPTIONS_SPEC=
  18 SUBDIRECTORY_OK=Yes
  19 . git-sh-setup
  20 . git-parse-remote
  21 require_work_tree
  22 wt_prefix=$(git rev-parse --show-prefix)
  23 cd_to_toplevel
  24
  25 # Tell the rest of git that any URLs we get don't come
  26 # directly from the user, so it can apply policy as appropriate.
  27 GIT_PROTOCOL_FROM_USER=0
  28 export GIT_PROTOCOL_FROM_USER
  29
  30 command=
  31 branch=
  32 force=
  33 reference=
  34 cached=
  35 recursive=
  36 init=
  37 files=
  38 remote=
  39 nofetch=
  40 update=
  41 prefix=
  42 custom_name=
  43 depth=
  44 progress=
  45 dissociate=
  46
  47 die_if_unmatched ()
  48 {
  49         if test "$1" = "#unmatched"
  50         then
  51                 exit ${2:-1}
  52         fi
  53 }
  54
  55 #
  56 # Print a submodule configuration setting
  57 #
  58 # $1 = submodule name
  59 # $2 = option name
  60 # $3 = default value
  61 #
  62 # Checks in the usual git-config places first (for overrides),
  63 # otherwise it falls back on .gitmodules.  This allows you to
  64 # distribute project-wide defaults in .gitmodules, while still
  65 # customizing individual repositories if necessary.  If the option is
  66 # not in .gitmodules either, print a default value.
  67 #
  68 get_submodule_config () {
  69         name="$1"
  70         option="$2"
  71         default="$3"
  72         value=$(git config submodule."$name"."$option")
  73         if test -z "$value"
  74         then
  75                 value=$(git submodule--helper config submodule."$name"."$option")
  76         fi
  77         printf '%s' "${value:-$default}"
  78 }
  79
  80 isnumber()
  81 {
  82         n=$(($1 + 0)) 2>/dev/null && test "$n" = "$1"
  83 }
  84
  85 # Given a full hex object ID, is this the zero OID?
  86 is_zero_oid () {
  87         echo "$1" | sane_egrep '^0+$' >/dev/null 2>&1
  88 }
  89
  90 # Sanitize the local git environment for use within a submodule. We
  91 # can't simply use clear_local_git_env since we want to preserve some
  92 # of the settings from GIT_CONFIG_PARAMETERS.
  93 sanitize_submodule_env()
  94 {
  95         save_config=$GIT_CONFIG_PARAMETERS
  96         clear_local_git_env
  97         GIT_CONFIG_PARAMETERS=$save_config
  98         export GIT_CONFIG_PARAMETERS
  99 }
 100
 101 #
 102 # Add a new submodule to the working tree, .gitmodules and the index
 103 #
 104 # $@ = repo path
 105 #
 106 # optional branch is stored in global branch variable
 107 #
 108 cmd_add()
 109 {
 110         # parse $args after "submodule ... add".
 111         reference_path=
 112         while test $# -ne 0
 113         do
 114                 case "$1" in
 115                 -b | --branch)
 116                         case "$2" in '') usage ;; esac
 117                         branch=$2
 118                         shift
 119                         ;;
 120                 -f | --force)
 121                         force=$1
 122                         ;;
 123                 -q|--quiet)
 124                         GIT_QUIET=1
 125                         ;;
 126                 --progress)
 127                         progress=1
 128                         ;;
 129                 --reference)
 130                         case "$2" in '') usage ;; esac
 131                         reference_path=$2
 132                         shift
 133                         ;;
 134                 --reference=*)
 135                         reference_path="${1#--reference=}"
 136                         ;;
 137                 --dissociate)
 138                         dissociate=1
 139                         ;;
 140                 --name)
 141                         case "$2" in '') usage ;; esac
 142                         custom_name=$2
 143                         shift
 144                         ;;
 145                 --depth)
 146                         case "$2" in '') usage ;; esac
 147                         depth="--depth=$2"
 148                         shift
 149                         ;;
 150                 --depth=*)
 151                         depth=$1
 152                         ;;
 153                 --)
 154                         shift
 155                         break
 156                         ;;
 157                 -*)
 158                         usage
 159                         ;;
 160                 *)
 161                         break
 162                         ;;
 163                 esac
 164                 shift
 165         done
 166
 167         if ! git submodule--helper config --check-writeable >/dev/null 2>&1
 168         then
 169                  die "$(eval_gettext "please make sure that the .gitmodules file is in the working tree")"
 170         fi
 171
 172         if test -n "$reference_path"
 173         then
 174                 is_absolute_path "$reference_path" ||
 175                 reference_path="$wt_prefix$reference_path"
 176
 177                 reference="--reference=$reference_path"
 178         fi
 179
 180         repo=$1
 181         sm_path=$2
 182
 183         if test -z "$sm_path"; then
 184                 sm_path=$(printf '%s\n' "$repo" |
 185                         sed -e 's|/$||' -e 's|:*/*\.git$||' -e 's|.*[/:]||g')
 186         fi
 187
 188         if test -z "$repo" || test -z "$sm_path"; then
 189                 usage
 190         fi
 191
 192         is_absolute_path "$sm_path" || sm_path="$wt_prefix$sm_path"
 193
 194         # assure repo is absolute or relative to parent
 195         case "$repo" in
 196         ./*|../*)
 197                 test -z "$wt_prefix" ||
 198                 die "$(gettext "Relative path can only be used from the toplevel of the working tree")"
 199
 200                 # dereference source url relative to parent's url
 201                 realrepo=$(git submodule--helper resolve-relative-url "$repo") || exit
 202                 ;;
 203         *:*|/*)
 204                 # absolute url
 205                 realrepo=$repo
 206                 ;;
 207         *)
 208                 die "$(eval_gettext "repo URL: '\$repo' must be absolute or begin with ./|../")"
 209         ;;
 210         esac
 211
 212         # normalize path:
 213         # multiple //; leading ./; /./; /../; trailing /
 214         sm_path=$(printf '%s/\n' "$sm_path" |
 215                 sed -e '
 216                         s|//*|/|g
 217                         s|^\(\./\)*||
 218                         s|/\(\./\)*|/|g
 219                         :start
 220                         s|\([^/]*\)/\.\./||
 221                         tstart
 222                         s|/*$||
 223                 ')
 224         if test -z "$force"
 225         then
 226                 git ls-files --error-unmatch "$sm_path" > /dev/null 2>&1 &&
 227                 die "$(eval_gettext "'\$sm_path' already exists in the index")"
 228         else
 229                 git ls-files -s "$sm_path" | sane_grep -v "^160000" > /dev/null 2>&1 &&
 230                 die "$(eval_gettext "'\$sm_path' already exists in the index and is not a submodule")"
 231         fi
 232
 233         if test -z "$force" &&
 234                 ! git add --dry-run --ignore-missing --no-warn-embedded-repo "$sm_path" > /dev/null 2>&1
 235         then
 236                 eval_gettextln "The following path is ignored by one of your .gitignore files:
 237 \$sm_path
 238 Use -f if you really want to add it." >&2
 239                 exit 1
 240         fi
 241
 242         if test -n "$custom_name"
 243         then
 244                 sm_name="$custom_name"
 245         else
 246                 sm_name="$sm_path"
 247         fi
 248
 249         if ! git submodule--helper check-name "$sm_name"
 250         then
 251                 die "$(eval_gettext "'$sm_name' is not a valid submodule name")"
 252         fi
 253
 254         # perhaps the path exists and is already a git repo, else clone it
 255         if test -e "$sm_path"
 256         then
 257                 if test -d "$sm_path"/.git || test -f "$sm_path"/.git
 258                 then
 259                         eval_gettextln "Adding existing repo at '\$sm_path' to the index"
 260                 else
 261                         die "$(eval_gettext "'\$sm_path' already exists and is not a valid git repo")"
 262                 fi
 263
 264         else
 265                 if test -d ".git/modules/$sm_name"
 266                 then
 267                         if test -z "$force"
 268                         then
 269                                 eval_gettextln >&2 "A git directory for '\$sm_name' is found locally with remote(s):"
 270                                 GIT_DIR=".git/modules/$sm_name" GIT_WORK_TREE=. git remote -v | grep '(fetch)' | sed -e s,^,"  ", -e s,' (fetch)',, >&2
 271                                 die "$(eval_gettextln "\
 272 If you want to reuse this local git directory instead of cloning again from
 273   \$realrepo
 274 use the '--force' option. If the local git directory is not the correct repo
 275 or you are unsure what this means choose another name with the '--name' option.")"
 276                         else
 277                                 eval_gettextln "Reactivating local git directory for submodule '\$sm_name'."
 278                         fi
 279                 fi
 280                 git submodule--helper clone ${GIT_QUIET:+--quiet} ${progress:+"--progress"} --prefix "$wt_prefix" --path "$sm_path" --name "$sm_name" --url "$realrepo" ${reference:+"$reference"} ${dissociate:+"--dissociate"} ${depth:+"$depth"} || exit
 281                 (
 282                         sanitize_submodule_env
 283                         cd "$sm_path" &&
 284                         # ash fails to wordsplit ${branch:+-b "$branch"...}
 285                         case "$branch" in
 286                         '') git checkout -f -q ;;
 287                         ?*) git checkout -f -q -B "$branch" "origin/$branch" ;;
 288                         esac
 289                 ) || die "$(eval_gettext "Unable to checkout submodule '\$sm_path'")"
 290         fi
 291         git config submodule."$sm_name".url "$realrepo"
 292
 293         git add --no-warn-embedded-repo $force "$sm_path" ||
 294         die "$(eval_gettext "Failed to add submodule '\$sm_path'")"
 295
 296         git submodule--helper config submodule."$sm_name".path "$sm_path" &&
 297         git submodule--helper config submodule."$sm_name".url "$repo" &&
 298         if test -n "$branch"
 299         then
 300                 git submodule--helper config submodule."$sm_name".branch "$branch"
 301         fi &&
 302         git add --force .gitmodules ||
 303         die "$(eval_gettext "Failed to register submodule '\$sm_path'")"
 304
 305         # NEEDSWORK: In a multi-working-tree world, this needs to be
 306         # set in the per-worktree config.
 307         if git config --get submodule.active >/dev/null
 308         then
 309                 # If the submodule being adding isn't already covered by the
 310                 # current configured pathspec, set the submodule's active flag
 311                 if ! git submodule--helper is-active "$sm_path"
 312                 then
 313                         git config submodule."$sm_name".active "true"
 314                 fi
 315         else
 316                 git config submodule."$sm_name".active "true"
 317         fi
 318 }
 319
 320 #
 321 # Execute an arbitrary command sequence in each checked out
 322 # submodule
 323 #
 324 # $@ = command to execute
 325 #
 326 cmd_foreach()
 327 {
 328         # parse $args after "submodule ... foreach".
 329         while test $# -ne 0
 330         do
 331                 case "$1" in
 332                 -q|--quiet)
 333                         GIT_QUIET=1
 334                         ;;
 335                 --recursive)
 336                         recursive=1
 337                         ;;
 338                 -*)
 339                         usage
 340                         ;;
 341                 *)
 342                         break
 343                         ;;
 344                 esac
 345                 shift
 346         done
 347
 348         git ${wt_prefix:+-C "$wt_prefix"} ${prefix:+--super-prefix "$prefix"} submodule--helper foreach ${GIT_QUIET:+--quiet} ${recursive:+--recursive} "$@"
 349 }
 350
 351 #
 352 # Register submodules in .git/config
 353 #
 354 # $@ = requested paths (default to all)
 355 #
 356 cmd_init()
 357 {
 358         # parse $args after "submodule ... init".
 359         while test $# -ne 0
 360         do
 361                 case "$1" in
 362                 -q|--quiet)
 363                         GIT_QUIET=1
 364                         ;;
 365                 --)
 366                         shift
 367                         break
 368                         ;;
 369                 -*)
 370                         usage
 371                         ;;
 372                 *)
 373                         break
 374                         ;;
 375                 esac
 376                 shift
 377         done
 378
 379         git ${wt_prefix:+-C "$wt_prefix"} ${prefix:+--super-prefix "$prefix"} submodule--helper init ${GIT_QUIET:+--quiet}  "$@"
 380 }
 381
 382 #
 383 # Unregister submodules from .git/config and remove their work tree
 384 #
 385 cmd_deinit()
 386 {
 387         # parse $args after "submodule ... deinit".
 388         deinit_all=
 389         while test $# -ne 0
 390         do
 391                 case "$1" in
 392                 -f|--force)
 393                         force=$1
 394                         ;;
 395                 -q|--quiet)
 396                         GIT_QUIET=1
 397                         ;;
 398                 --all)
 399                         deinit_all=t
 400                         ;;
 401                 --)
 402                         shift
 403                         break
 404                         ;;
 405                 -*)
 406                         usage
 407                         ;;
 408                 *)
 409                         break
 410                         ;;
 411                 esac
 412                 shift
 413         done
 414
 415         git ${wt_prefix:+-C "$wt_prefix"} submodule--helper deinit ${GIT_QUIET:+--quiet} ${prefix:+--prefix "$prefix"} ${force:+--force} ${deinit_all:+--all} "$@"
 416 }
 417
 418 is_tip_reachable () (
 419         sanitize_submodule_env &&
 420         cd "$1" &&
 421         rev=$(git rev-list -n 1 "$2" --not --all 2>/dev/null) &&
 422         test -z "$rev"
 423 )
 424
 425 fetch_in_submodule () (
 426         sanitize_submodule_env &&
 427         cd "$1" &&
 428         case "$2" in
 429         '')
 430                 git fetch ;;
 431         *)
 432                 shift
 433                 git fetch $(get_default_remote) "$@" ;;
 434         esac
 435 )
 436
 437 #
 438 # Update each submodule path to correct revision, using clone and checkout as needed
 439 #
 440 # $@ = requested paths (default to all)
 441 #
 442 cmd_update()
 443 {
 444         # parse $args after "submodule ... update".
 445         while test $# -ne 0
 446         do
 447                 case "$1" in
 448                 -q|--quiet)
 449                         GIT_QUIET=1
 450                         ;;
 451                 -v)
 452                         GIT_QUIET=0
 453                         ;;
 454                 --progress)
 455                         progress=1
 456                         ;;
 457                 -i|--init)
 458                         init=1
 459                         ;;
 460                 --remote)
 461                         remote=1
 462                         ;;
 463                 -N|--no-fetch)
 464                         nofetch=1
 465                         ;;
 466                 -f|--force)
 467                         force=$1
 468                         ;;
 469                 -r|--rebase)
 470                         update="rebase"
 471                         ;;
 472                 --reference)
 473                         case "$2" in '') usage ;; esac
 474                         reference="--reference=$2"
 475                         shift
 476                         ;;
 477                 --reference=*)
 478                         reference="$1"
 479                         ;;
 480                 --dissociate)
 481                         dissociate=1
 482                         ;;
 483                 -m|--merge)
 484                         update="merge"
 485                         ;;
 486                 --recursive)
 487                         recursive=1
 488                         ;;
 489                 --checkout)
 490                         update="checkout"
 491                         ;;
 492                 --recommend-shallow)
 493                         recommend_shallow="--recommend-shallow"
 494                         ;;
 495                 --no-recommend-shallow)
 496                         recommend_shallow="--no-recommend-shallow"
 497                         ;;
 498                 --depth)
 499                         case "$2" in '') usage ;; esac
 500                         depth="--depth=$2"
 501                         shift
 502                         ;;
 503                 --depth=*)
 504                         depth=$1
 505                         ;;
 506                 -j|--jobs)
 507                         case "$2" in '') usage ;; esac
 508                         jobs="--jobs=$2"
 509                         shift
 510                         ;;
 511                 --jobs=*)
 512                         jobs=$1
 513                         ;;
 514                 --)
 515                         shift
 516                         break
 517                         ;;
 518                 -*)
 519                         usage
 520                         ;;
 521                 *)
 522                         break
 523                         ;;
 524                 esac
 525                 shift
 526         done
 527
 528         if test -n "$init"
 529         then
 530                 cmd_init "--" "$@" || return
 531         fi
 532
 533         {
 534         git submodule--helper update-clone ${GIT_QUIET:+--quiet} \
 535                 ${progress:+"--progress"} \
 536                 ${wt_prefix:+--prefix "$wt_prefix"} \
 537                 ${prefix:+--recursive-prefix "$prefix"} \
 538                 ${update:+--update "$update"} \
 539                 ${reference:+"$reference"} \
 540                 ${dissociate:+"--dissociate"} \
 541                 ${depth:+--depth "$depth"} \
 542                 $recommend_shallow \
 543                 $jobs \
 544                 "$@" || echo "#unmatched" $?
 545         } | {
 546         err=
 547         while read -r quickabort sha1 just_cloned sm_path
 548         do
 549                 die_if_unmatched "$quickabort" "$sha1"
 550
 551                 git submodule--helper ensure-core-worktree "$sm_path"
 552
 553                 update_module=$(git submodule--helper update-module-mode $just_cloned "$sm_path" $update)
 554
 555                 displaypath=$(git submodule--helper relative-path "$prefix$sm_path" "$wt_prefix")
 556
 557                 if test $just_cloned -eq 1
 558                 then
 559                         subsha1=
 560                 else
 561                         subsha1=$(sanitize_submodule_env; cd "$sm_path" &&
 562                                 git rev-parse --verify HEAD) ||
 563                         die "$(eval_gettext "Unable to find current revision in submodule path '\$displaypath'")"
 564                 fi
 565
 566                 if test -n "$remote"
 567                 then
 568                         branch=$(git submodule--helper remote-branch "$sm_path")
 569                         if test -z "$nofetch"
 570                         then
 571                                 # Fetch remote before determining tracking $sha1
 572                                 fetch_in_submodule "$sm_path" $depth ||
 573                                 die "$(eval_gettext "Unable to fetch in submodule path '\$sm_path'")"
 574                         fi
 575                         remote_name=$(sanitize_submodule_env; cd "$sm_path" && get_default_remote)
 576                         sha1=$(sanitize_submodule_env; cd "$sm_path" &&
 577                                 git rev-parse --verify "${remote_name}/${branch}") ||
 578                         die "$(eval_gettext "Unable to find current \${remote_name}/\${branch} revision in submodule path '\$sm_path'")"
 579                 fi
 580
 581                 if test "$subsha1" != "$sha1" || test -n "$force"
 582                 then
 583                         subforce=$force
 584                         # If we don't already have a -f flag and the submodule has never been checked out
 585                         if test -z "$subsha1" && test -z "$force"
 586                         then
 587                                 subforce="-f"
 588                         fi
 589
 590                         if test -z "$nofetch"
 591                         then
 592                                 # Run fetch only if $sha1 isn't present or it
 593                                 # is not reachable from a ref.
 594                                 is_tip_reachable "$sm_path" "$sha1" ||
 595                                 fetch_in_submodule "$sm_path" $depth ||
 596                                 say "$(eval_gettext "Unable to fetch in submodule path '\$displaypath'")"
 597
 598                                 # Now we tried the usual fetch, but $sha1 may
 599                                 # not be reachable from any of the refs
 600                                 is_tip_reachable "$sm_path" "$sha1" ||
 601                                 fetch_in_submodule "$sm_path" $depth "$sha1" ||
 602                                 die "$(eval_gettext "Fetched in submodule path '\$displaypath', but it did not contain \$sha1. Direct fetching of that commit failed.")"
 603                         fi
 604
 605                         must_die_on_failure=
 606                         case "$update_module" in
 607                         checkout)
 608                                 command="git checkout $subforce -q"
 609                                 die_msg="$(eval_gettext "Unable to checkout '\$sha1' in submodule path '\$displaypath'")"
 610                                 say_msg="$(eval_gettext "Submodule path '\$displaypath': checked out '\$sha1'")"
 611                                 ;;
 612                         rebase)
 613                                 command="git rebase"
 614                                 die_msg="$(eval_gettext "Unable to rebase '\$sha1' in submodule path '\$displaypath'")"
 615                                 say_msg="$(eval_gettext "Submodule path '\$displaypath': rebased into '\$sha1'")"
 616                                 must_die_on_failure=yes
 617                                 ;;
 618                         merge)
 619                                 command="git merge"
 620                                 die_msg="$(eval_gettext "Unable to merge '\$sha1' in submodule path '\$displaypath'")"
 621                                 say_msg="$(eval_gettext "Submodule path '\$displaypath': merged in '\$sha1'")"
 622                                 must_die_on_failure=yes
 623                                 ;;
 624                         !*)
 625                                 command="${update_module#!}"
 626                                 die_msg="$(eval_gettext "Execution of '\$command \$sha1' failed in submodule path '\$displaypath'")"
 627                                 say_msg="$(eval_gettext "Submodule path '\$displaypath': '\$command \$sha1'")"
 628                                 must_die_on_failure=yes
 629                                 ;;
 630                         *)
 631                                 die "$(eval_gettext "Invalid update mode '$update_module' for submodule path '$path'")"
 632                         esac
 633
 634                         if (sanitize_submodule_env; cd "$sm_path" && $command "$sha1")
 635                         then
 636                                 say "$say_msg"
 637                         elif test -n "$must_die_on_failure"
 638                         then
 639                                 die_with_status 2 "$die_msg"
 640                         else
 641                                 err="${err};$die_msg"
 642                                 continue
 643                         fi
 644                 fi
 645
 646                 if test -n "$recursive"
 647                 then
 648                         (
 649                                 prefix=$(git submodule--helper relative-path "$prefix$sm_path/" "$wt_prefix")
 650                                 wt_prefix=
 651                                 sanitize_submodule_env
 652                                 cd "$sm_path" &&
 653                                 eval cmd_update
 654                         )
 655                         res=$?
 656                         if test $res -gt 0
 657                         then
 658                                 die_msg="$(eval_gettext "Failed to recurse into submodule path '\$displaypath'")"
 659                                 if test $res -ne 2
 660                                 then
 661                                         err="${err};$die_msg"
 662                                         continue
 663                                 else
 664                                         die_with_status $res "$die_msg"
 665                                 fi
 666                         fi
 667                 fi
 668         done
 669
 670         if test -n "$err"
 671         then
 672                 OIFS=$IFS
 673                 IFS=';'
 674                 for e in $err
 675                 do
 676                         if test -n "$e"
 677                         then
 678                                 echo >&2 "$e"
 679                         fi
 680                 done
 681                 IFS=$OIFS
 682                 exit 1
 683         fi
 684         }
 685 }
 686
 687 #
 688 # Show commit summary for submodules in index or working tree
 689 #
 690 # If '--cached' is given, show summary between index and given commit,
 691 # or between working tree and given commit
 692 #
 693 # $@ = [commit (default 'HEAD'),] requested paths (default all)
 694 #
 695 cmd_summary() {
 696         summary_limit=-1
 697         for_status=
 698         diff_cmd=diff-index
 699
 700         # parse $args after "submodule ... summary".
 701         while test $# -ne 0
 702         do
 703                 case "$1" in
 704                 --cached)
 705                         cached="$1"
 706                         ;;
 707                 --files)
 708                         files="$1"
 709                         ;;
 710                 --for-status)
 711                         for_status="$1"
 712                         ;;
 713                 -n|--summary-limit)
 714                         summary_limit="$2"
 715                         isnumber "$summary_limit" || usage
 716                         shift
 717                         ;;
 718                 --summary-limit=*)
 719                         summary_limit="${1#--summary-limit=}"
 720                         isnumber "$summary_limit" || usage
 721                         ;;
 722                 --)
 723                         shift
 724                         break
 725                         ;;
 726                 -*)
 727                         usage
 728                         ;;
 729                 *)
 730                         break
 731                         ;;
 732                 esac
 733                 shift
 734         done
 735
 736         test $summary_limit = 0 && return
 737
 738         if rev=$(git rev-parse -q --verify --default HEAD ${1+"$1"})
 739         then
 740                 head=$rev
 741                 test $# = 0 || shift
 742         elif test -z "$1" || test "$1" = "HEAD"
 743         then
 744                 # before the first commit: compare with an empty tree
 745                 head=$(git hash-object -w -t tree --stdin </dev/null)
 746                 test -z "$1" || shift
 747         else
 748                 head="HEAD"
 749         fi
 750
 751         if [ -n "$files" ]
 752         then
 753                 test -n "$cached" &&
 754                 die "$(gettext "The --cached option cannot be used with the --files option")"
 755                 diff_cmd=diff-files
 756                 head=
 757         fi
 758
 759         cd_to_toplevel
 760         eval "set $(git rev-parse --sq --prefix "$wt_prefix" -- "$@")"
 761         # Get modified modules cared by user
 762         modules=$(git $diff_cmd $cached --ignore-submodules=dirty --raw $head -- "$@" |
 763                 sane_egrep '^:([0-7]* )?160000' |
 764                 while read -r mod_src mod_dst sha1_src sha1_dst status sm_path
 765                 do
 766                         # Always show modules deleted or type-changed (blob<->module)
 767                         if test "$status" = D || test "$status" = T
 768                         then
 769                                 printf '%s\n' "$sm_path"
 770                                 continue
 771                         fi
 772                         # Respect the ignore setting for --for-status.
 773                         if test -n "$for_status"
 774                         then
 775                                 name=$(git submodule--helper name "$sm_path")
 776                                 ignore_config=$(get_submodule_config "$name" ignore none)
 777                                 test $status != A && test $ignore_config = all && continue
 778                         fi
 779                         # Also show added or modified modules which are checked out
 780                         GIT_DIR="$sm_path/.git" git rev-parse --git-dir >/dev/null 2>&1 &&
 781                         printf '%s\n' "$sm_path"
 782                 done
 783         )
 784
 785         test -z "$modules" && return
 786
 787         git $diff_cmd $cached --ignore-submodules=dirty --raw $head -- $modules |
 788         sane_egrep '^:([0-7]* )?160000' |
 789         cut -c2- |
 790         while read -r mod_src mod_dst sha1_src sha1_dst status name
 791         do
 792                 if test -z "$cached" &&
 793                         is_zero_oid $sha1_dst
 794                 then
 795                         case "$mod_dst" in
 796                         160000)
 797                                 sha1_dst=$(GIT_DIR="$name/.git" git rev-parse HEAD)
 798                                 ;;
 799                         100644 | 100755 | 120000)
 800                                 sha1_dst=$(git hash-object $name)
 801                                 ;;
 802                         000000)
 803                                 ;; # removed
 804                         *)
 805                                 # unexpected type
 806                                 eval_gettextln "unexpected mode \$mod_dst" >&2
 807                                 continue ;;
 808                         esac
 809                 fi
 810                 missing_src=
 811                 missing_dst=
 812
 813                 test $mod_src = 160000 &&
 814                 ! GIT_DIR="$name/.git" git rev-parse -q --verify $sha1_src^0 >/dev/null &&
 815                 missing_src=t
 816
 817                 test $mod_dst = 160000 &&
 818                 ! GIT_DIR="$name/.git" git rev-parse -q --verify $sha1_dst^0 >/dev/null &&
 819                 missing_dst=t
 820
 821                 display_name=$(git submodule--helper relative-path "$name" "$wt_prefix")
 822
 823                 total_commits=
 824                 case "$missing_src,$missing_dst" in
 825                 t,)
 826                         errmsg="$(eval_gettext "  Warn: \$display_name doesn't contain commit \$sha1_src")"
 827                         ;;
 828                 ,t)
 829                         errmsg="$(eval_gettext "  Warn: \$display_name doesn't contain commit \$sha1_dst")"
 830                         ;;
 831                 t,t)
 832                         errmsg="$(eval_gettext "  Warn: \$display_name doesn't contain commits \$sha1_src and \$sha1_dst")"
 833                         ;;
 834                 *)
 835                         errmsg=
 836                         total_commits=$(
 837                         if test $mod_src = 160000 && test $mod_dst = 160000
 838                         then
 839                                 range="$sha1_src...$sha1_dst"
 840                         elif test $mod_src = 160000
 841                         then
 842                                 range=$sha1_src
 843                         else
 844                                 range=$sha1_dst
 845                         fi
 846                         GIT_DIR="$name/.git" \
 847                         git rev-list --first-parent $range -- | wc -l
 848                         )
 849                         total_commits=" ($(($total_commits + 0)))"
 850                         ;;
 851                 esac
 852
 853                 sha1_abbr_src=$(echo $sha1_src | cut -c1-7)
 854                 sha1_abbr_dst=$(echo $sha1_dst | cut -c1-7)
 855                 if test $status = T
 856                 then
 857                         blob="$(gettext "blob")"
 858                         submodule="$(gettext "submodule")"
 859                         if test $mod_dst = 160000
 860                         then
 861                                 echo "* $display_name $sha1_abbr_src($blob)->$sha1_abbr_dst($submodule)$total_commits:"
 862                         else
 863                                 echo "* $display_name $sha1_abbr_src($submodule)->$sha1_abbr_dst($blob)$total_commits:"
 864                         fi
 865                 else
 866                         echo "* $display_name $sha1_abbr_src...$sha1_abbr_dst$total_commits:"
 867                 fi
 868                 if test -n "$errmsg"
 869                 then
 870                         # Don't give error msg for modification whose dst is not submodule
 871                         # i.e. deleted or changed to blob
 872                         test $mod_dst = 160000 && echo "$errmsg"
 873                 else
 874                         if test $mod_src = 160000 && test $mod_dst = 160000
 875                         then
 876                                 limit=
 877                                 test $summary_limit -gt 0 && limit="-$summary_limit"
 878                                 GIT_DIR="$name/.git" \
 879                                 git log $limit --pretty='format:  %m %s' \
 880                                 --first-parent $sha1_src...$sha1_dst
 881                         elif test $mod_dst = 160000
 882                         then
 883                                 GIT_DIR="$name/.git" \
 884                                 git log --pretty='format:  > %s' -1 $sha1_dst
 885                         else
 886                                 GIT_DIR="$name/.git" \
 887                                 git log --pretty='format:  < %s' -1 $sha1_src
 888                         fi
 889                         echo
 890                 fi
 891                 echo
 892         done
 893 }
 894 #
 895 # List all submodules, prefixed with:
 896 #  - submodule not initialized
 897 #  + different revision checked out
 898 #
 899 # If --cached was specified the revision in the index will be printed
 900 # instead of the currently checked out revision.
 901 #
 902 # $@ = requested paths (default to all)
 903 #
 904 cmd_status()
 905 {
 906         # parse $args after "submodule ... status".
 907         while test $# -ne 0
 908         do
 909                 case "$1" in
 910                 -q|--quiet)
 911                         GIT_QUIET=1
 912                         ;;
 913                 --cached)
 914                         cached=1
 915                         ;;
 916                 --recursive)
 917                         recursive=1
 918                         ;;
 919                 --)
 920                         shift
 921                         break
 922                         ;;
 923                 -*)
 924                         usage
 925                         ;;
 926                 *)
 927                         break
 928                         ;;
 929                 esac
 930                 shift
 931         done
 932
 933         git ${wt_prefix:+-C "$wt_prefix"} ${prefix:+--super-prefix "$prefix"} submodule--helper status ${GIT_QUIET:+--quiet} ${cached:+--cached} ${recursive:+--recursive} "$@"
 934 }
 935 #
 936 # Sync remote urls for submodules
 937 # This makes the value for remote.$remote.url match the value
 938 # specified in .gitmodules.
 939 #
 940 cmd_sync()
 941 {
 942         while test $# -ne 0
 943         do
 944                 case "$1" in
 945                 -q|--quiet)
 946                         GIT_QUIET=1
 947                         shift
 948                         ;;
 949                 --recursive)
 950                         recursive=1
 951                         shift
 952                         ;;
 953                 --)
 954                         shift
 955                         break
 956                         ;;
 957                 -*)
 958                         usage
 959                         ;;
 960                 *)
 961                         break
 962                         ;;
 963                 esac
 964         done
 965
 966         git ${wt_prefix:+-C "$wt_prefix"} ${prefix:+--super-prefix "$prefix"} submodule--helper sync ${GIT_QUIET:+--quiet} ${recursive:+--recursive} "$@"
 967 }
 968
 969 cmd_absorbgitdirs()
 970 {
 971         git submodule--helper absorb-git-dirs --prefix "$wt_prefix" "$@"
 972 }
 973
 974 # This loop parses the command line arguments to find the
 975 # subcommand name to dispatch.  Parsing of the subcommand specific
 976 # options are primarily done by the subcommand implementations.
 977 # Subcommand specific options such as --branch and --cached are
 978 # parsed here as well, for backward compatibility.
 979
 980 while test $# != 0 && test -z "$command"
 981 do
 982         case "$1" in
 983         add | foreach | init | deinit | update | status | summary | sync | absorbgitdirs)
 984                 command=$1
 985                 ;;
 986         -q|--quiet)
 987                 GIT_QUIET=1
 988                 ;;
 989         -b|--branch)
 990                 case "$2" in
 991                 '')
 992                         usage
 993                         ;;
 994                 esac
 995                 branch="$2"; shift
 996                 ;;
 997         --cached)
 998                 cached="$1"
 999                 ;;
1000         --)
1001                 break
1002                 ;;
1003         -*)
1004                 usage
1005                 ;;
1006         *)
1007                 break
1008                 ;;
1009         esac
1010         shift
1011 done
1012
1013 # No command word defaults to "status"
1014 if test -z "$command"
1015 then
1016     if test $# = 0
1017     then
1018         command=status
1019     else
1020         usage
1021     fi
1022 fi
1023
1024 # "-b branch" is accepted only by "add"
1025 if test -n "$branch" && test "$command" != add
1026 then
1027         usage
1028 fi
1029
1030 # "--cached" is accepted only by "status" and "summary"
1031 if test -n "$cached" && test "$command" != status && test "$command" != summary
1032 then
1033         usage
1034 fi
1035
1036 "cmd_$command" "$@"