packaging: Add contrib installation
[platform/upstream/git.git] / git-submodule.sh
index 9bc5c5f..eb90f18 100755 (executable)
@@ -5,31 +5,29 @@
 # Copyright (c) 2007 Lars Hjemli
 
 dashless=$(basename "$0" | sed -e 's/-/ /')
-USAGE="[--quiet] add [-b <branch>] [-f|--force] [--name <name>] [--reference <repository>] [--] <repository> [<path>]
+USAGE="[--quiet] [--cached]
+   or: $dashless [--quiet] add [-b <branch>] [-f|--force] [--name <name>] [--reference <repository>] [--] <repository> [<path>]
    or: $dashless [--quiet] status [--cached] [--recursive] [--] [<path>...]
    or: $dashless [--quiet] init [--] [<path>...]
-   or: $dashless [--quiet] deinit [-f|--force] [--] <path>...
-   or: $dashless [--quiet] update [--init] [--remote] [-N|--no-fetch] [-f|--force] [--checkout|--merge|--rebase] [--reference <repository>] [--recursive] [--] [<path>...]
+   or: $dashless [--quiet] deinit [-f|--force] (--all| [--] <path>...)
+   or: $dashless [--quiet] update [--init] [--remote] [-N|--no-fetch] [-f|--force] [--checkout|--merge|--rebase] [--[no-]recommend-shallow] [--reference <repository>] [--recursive] [--[no-]single-branch] [--] [<path>...]
+   or: $dashless [--quiet] set-branch (--default|--branch <branch>) [--] <path>
+   or: $dashless [--quiet] set-url [--] <path> <newurl>
    or: $dashless [--quiet] summary [--cached|--files] [--summary-limit <n>] [commit] [--] [<path>...]
    or: $dashless [--quiet] foreach [--recursive] <command>
-   or: $dashless [--quiet] sync [--recursive] [--] [<path>...]"
+   or: $dashless [--quiet] sync [--recursive] [--] [<path>...]
+   or: $dashless [--quiet] absorbgitdirs [--] [<path>...]"
 OPTIONS_SPEC=
 SUBDIRECTORY_OK=Yes
 . git-sh-setup
-. git-sh-i18n
-. git-parse-remote
 require_work_tree
 wt_prefix=$(git rev-parse --show-prefix)
 cd_to_toplevel
 
-# Restrict ourselves to a vanilla subset of protocols; the URLs
-# we get are under control of a remote repository, and we do not
-# want them kicking off arbitrary git-remote-* programs.
-#
-# If the user has already specified a set of allowed protocols,
-# we assume they know what they're doing and use that instead.
-: ${GIT_ALLOW_PROTOCOL=file:git:http:https:ssh}
-export GIT_ALLOW_PROTOCOL
+# Tell the rest of git that any URLs we get don't come
+# directly from the user, so it can apply policy as appropriate.
+GIT_PROTOCOL_FROM_USER=0
+export GIT_PROTOCOL_FROM_USER
 
 command=
 branch=
@@ -38,6 +36,7 @@ reference=
 cached=
 recursive=
 init=
+require_init=
 files=
 remote=
 nofetch=
@@ -45,153 +44,41 @@ update=
 prefix=
 custom_name=
 depth=
-
-# The function takes at most 2 arguments. The first argument is the
-# URL that navigates to the submodule origin repo. When relative, this URL
-# is relative to the superproject origin URL repo. The second up_path
-# argument, if specified, is the relative path that navigates
-# from the submodule working tree to the superproject working tree.
-#
-# The output of the function is the origin URL of the submodule.
-#
-# The output will either be an absolute URL or filesystem path (if the
-# superproject origin URL is an absolute URL or filesystem path,
-# respectively) or a relative file system path (if the superproject
-# origin URL is a relative file system path).
-#
-# When the output is a relative file system path, the path is either
-# relative to the submodule working tree, if up_path is specified, or to
-# the superproject working tree otherwise.
-resolve_relative_url ()
-{
-       remote=$(get_default_remote)
-       remoteurl=$(git config "remote.$remote.url") ||
-               remoteurl=$(pwd) # the repository is its own authoritative upstream
-       url="$1"
-       remoteurl=${remoteurl%/}
-       sep=/
-       up_path="$2"
-
-       case "$remoteurl" in
-       *:*|/*)
-               is_relative=
-               ;;
-       ./*|../*)
-               is_relative=t
-               ;;
-       *)
-               is_relative=t
-               remoteurl="./$remoteurl"
-               ;;
-       esac
-
-       while test -n "$url"
-       do
-               case "$url" in
-               ../*)
-                       url="${url#../}"
-                       case "$remoteurl" in
-                       */*)
-                               remoteurl="${remoteurl%/*}"
-                               ;;
-                       *:*)
-                               remoteurl="${remoteurl%:*}"
-                               sep=:
-                               ;;
-                       *)
-                               if test -z "$is_relative" || test "." = "$remoteurl"
-                               then
-                                       die "$(eval_gettext "cannot strip one component off url '\$remoteurl'")"
-                               else
-                                       remoteurl=.
-                               fi
-                               ;;
-                       esac
-                       ;;
-               ./*)
-                       url="${url#./}"
-                       ;;
-               *)
-                       break;;
-               esac
-       done
-       remoteurl="$remoteurl$sep${url%/}"
-       echo "${is_relative:+${up_path}}${remoteurl#./}"
-}
-
-# Resolve a path to be relative to another path.  This is intended for
-# converting submodule paths when git-submodule is run in a subdirectory
-# and only handles paths where the directory separator is '/'.
-#
-# The output is the first argument as a path relative to the second argument,
-# which defaults to $wt_prefix if it is omitted.
-relative_path ()
-{
-       local target curdir result
-       target=$1
-       curdir=${2-$wt_prefix}
-       curdir=${curdir%/}
-       result=
-
-       while test -n "$curdir"
-       do
-               case "$target" in
-               "$curdir/"*)
-                       target=${target#"$curdir"/}
-                       break
-                       ;;
-               esac
-
-               result="${result}../"
-               if test "$curdir" = "${curdir%/*}"
-               then
-                       curdir=
-               else
-                       curdir="${curdir%/*}"
-               fi
-       done
-
-       echo "$result$target"
-}
+progress=
+dissociate=
+single_branch=
+jobs=
+recommend_shallow=
 
 die_if_unmatched ()
 {
        if test "$1" = "#unmatched"
        then
-               exit 1
+               exit ${2:-1}
        fi
 }
 
-#
-# Print a submodule configuration setting
-#
-# $1 = submodule name
-# $2 = option name
-# $3 = default value
-#
-# Checks in the usual git-config places first (for overrides),
-# otherwise it falls back on .gitmodules.  This allows you to
-# distribute project-wide defaults in .gitmodules, while still
-# customizing individual repositories if necessary.  If the option is
-# not in .gitmodules either, print a default value.
-#
-get_submodule_config () {
-       name="$1"
-       option="$2"
-       default="$3"
-       value=$(git config submodule."$name"."$option")
-       if test -z "$value"
-       then
-               value=$(git config -f .gitmodules submodule."$name"."$option")
-       fi
-       printf '%s' "${value:-$default}"
-}
-
 isnumber()
 {
        n=$(($1 + 0)) 2>/dev/null && test "$n" = "$1"
 }
 
+# Given a full hex object ID, is this the zero OID?
+is_zero_oid () {
+       echo "$1" | sane_egrep '^0+$' >/dev/null 2>&1
+}
+
+# Sanitize the local git environment for use within a submodule. We
+# can't simply use clear_local_git_env since we want to preserve some
+# of the settings from GIT_CONFIG_PARAMETERS.
+sanitize_submodule_env()
+{
+       save_config=$GIT_CONFIG_PARAMETERS
+       clear_local_git_env
+       GIT_CONFIG_PARAMETERS=$save_config
+       export GIT_CONFIG_PARAMETERS
+}
+
 #
 # Add a new submodule to the working tree, .gitmodules and the index
 #
@@ -217,6 +104,9 @@ cmd_add()
                -q|--quiet)
                        GIT_QUIET=1
                        ;;
+               --progress)
+                       progress=1
+                       ;;
                --reference)
                        case "$2" in '') usage ;; esac
                        reference_path=$2
@@ -225,6 +115,9 @@ cmd_add()
                --reference=*)
                        reference_path="${1#--reference=}"
                        ;;
+               --dissociate)
+                       dissociate=1
+                       ;;
                --name)
                        case "$2" in '') usage ;; esac
                        custom_name=$2
@@ -252,6 +145,11 @@ cmd_add()
                shift
        done
 
+       if ! git submodule--helper config --check-writeable >/dev/null 2>&1
+       then
+                die "$(eval_gettext "please make sure that the .gitmodules file is in the working tree")"
+       fi
+
        if test -n "$reference_path"
        then
                is_absolute_path "$reference_path" ||
@@ -281,7 +179,7 @@ cmd_add()
                die "$(gettext "Relative path can only be used from the toplevel of the working tree")"
 
                # dereference source url relative to parent's url
-               realrepo=$(resolve_relative_url "$repo") || exit
+               realrepo=$(git submodule--helper resolve-relative-url "$repo") || exit
                ;;
        *:*|/*)
                # absolute url
@@ -304,15 +202,31 @@ cmd_add()
                        tstart
                        s|/*$||
                ')
-       git ls-files --error-unmatch "$sm_path" > /dev/null 2>&1 &&
-       die "$(eval_gettext "'\$sm_path' already exists in the index")"
+       if test -z "$force"
+       then
+               git ls-files --error-unmatch "$sm_path" > /dev/null 2>&1 &&
+               die "$(eval_gettext "'\$sm_path' already exists in the index")"
+       else
+               git ls-files -s "$sm_path" | sane_grep -v "^160000" > /dev/null 2>&1 &&
+               die "$(eval_gettext "'\$sm_path' already exists in the index and is not a submodule")"
+       fi
 
-       if test -z "$force" && ! git add --dry-run --ignore-missing "$sm_path" > /dev/null 2>&1
+       if test -d "$sm_path" &&
+               test -z $(git -C "$sm_path" rev-parse --show-cdup 2>/dev/null)
        then
-               eval_gettextln "The following path is ignored by one of your .gitignore files:
-\$sm_path
-Use -f if you really want to add it." >&2
-               exit 1
+           git -C "$sm_path" rev-parse --verify -q HEAD >/dev/null ||
+           die "$(eval_gettext "'\$sm_path' does not have a commit checked out")"
+       fi
+
+       if test -z "$force"
+       then
+           dryerr=$(git add --dry-run --ignore-missing --no-warn-embedded-repo "$sm_path" 2>&1 >/dev/null)
+           res=$?
+           if test $res -ne 0
+           then
+                echo >&2 "$dryerr"
+                exit $res
+           fi
        fi
 
        if test -n "$custom_name"
@@ -322,6 +236,11 @@ Use -f if you really want to add it." >&2
                sm_name="$sm_path"
        fi
 
+       if ! git submodule--helper check-name "$sm_name"
+       then
+               die "$(eval_gettext "'$sm_name' is not a valid submodule name")"
+       fi
+
        # perhaps the path exists and is already a git repo, else clone it
        if test -e "$sm_path"
        then
@@ -337,19 +256,20 @@ Use -f if you really want to add it." >&2
                then
                        if test -z "$force"
                        then
-                               echo >&2 "$(eval_gettext "A git directory for '\$sm_name' is found locally with remote(s):")"
+                               eval_gettextln >&2 "A git directory for '\$sm_name' is found locally with remote(s):"
                                GIT_DIR=".git/modules/$sm_name" GIT_WORK_TREE=. git remote -v | grep '(fetch)' | sed -e s,^,"  ", -e s,' (fetch)',, >&2
-                               echo >&2 "$(eval_gettext "If you want to reuse this local git directory instead of cloning again from")"
-                               echo >&2 "  $realrepo"
-                               echo >&2 "$(eval_gettext "use the '--force' option. If the local git directory is not the correct repo")"
-                               die "$(eval_gettext "or you are unsure what this means choose another name with the '--name' option.")"
+                               die "$(eval_gettextln "\
+If you want to reuse this local git directory instead of cloning again from
+  \$realrepo
+use the '--force' option. If the local git directory is not the correct repo
+or you are unsure what this means choose another name with the '--name' option.")"
                        else
-                               echo "$(eval_gettext "Reactivating local git directory for submodule '\$sm_name'.")"
+                               eval_gettextln "Reactivating local git directory for submodule '\$sm_name'."
                        fi
                fi
-               git submodule--helper clone ${GIT_QUIET:+--quiet} --prefix "$wt_prefix" --path "$sm_path" --name "$sm_name" --url "$realrepo" "$reference" "$depth" || exit
+               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
                (
-                       clear_local_git_env
+                       sanitize_submodule_env
                        cd "$sm_path" &&
                        # ash fails to wordsplit ${branch:+-b "$branch"...}
                        case "$branch" in
@@ -360,17 +280,31 @@ Use -f if you really want to add it." >&2
        fi
        git config submodule."$sm_name".url "$realrepo"
 
-       git add $force "$sm_path" ||
+       git add --no-warn-embedded-repo $force "$sm_path" ||
        die "$(eval_gettext "Failed to add submodule '\$sm_path'")"
 
-       git config -f .gitmodules submodule."$sm_name".path "$sm_path" &&
-       git config -f .gitmodules submodule."$sm_name".url "$repo" &&
+       git submodule--helper config submodule."$sm_name".path "$sm_path" &&
+       git submodule--helper config submodule."$sm_name".url "$repo" &&
        if test -n "$branch"
        then
-               git config -f .gitmodules submodule."$sm_name".branch "$branch"
+               git submodule--helper config submodule."$sm_name".branch "$branch"
        fi &&
        git add --force .gitmodules ||
        die "$(eval_gettext "Failed to register submodule '\$sm_path'")"
+
+       # NEEDSWORK: In a multi-working-tree world, this needs to be
+       # set in the per-worktree config.
+       if git config --get submodule.active >/dev/null
+       then
+               # If the submodule being adding isn't already covered by the
+               # current configured pathspec, set the submodule's active flag
+               if ! git submodule--helper is-active "$sm_path"
+               then
+                       git config submodule."$sm_name".active "true"
+               fi
+       else
+               git config submodule."$sm_name".active "true"
+       fi
 }
 
 #
@@ -401,42 +335,7 @@ cmd_foreach()
                shift
        done
 
-       toplevel=$(pwd)
-
-       # dup stdin so that it can be restored when running the external
-       # command in the subshell (and a recursive call to this function)
-       exec 3<&0
-
-       git submodule--helper list --prefix "$wt_prefix"|
-       while read mode sha1 stage sm_path
-       do
-               die_if_unmatched "$mode"
-               if test -e "$sm_path"/.git
-               then
-                       displaypath=$(relative_path "$sm_path")
-                       say "$(eval_gettext "Entering '\$prefix\$displaypath'")"
-                       name=$(git submodule--helper name "$sm_path")
-                       (
-                               prefix="$prefix$sm_path/"
-                               clear_local_git_env
-                               cd "$sm_path" &&
-                               sm_path=$(relative_path "$sm_path") &&
-                               # we make $path available to scripts ...
-                               path=$sm_path &&
-                               if test $# -eq 1
-                               then
-                                       eval "$1"
-                               else
-                                       "$@"
-                               fi &&
-                               if test -n "$recursive"
-                               then
-                                       cmd_foreach "--recursive" "$@"
-                               fi
-                       ) <&3 3<&- ||
-                       die "$(eval_gettext "Stopping at '\$prefix\$displaypath'; script returned non-zero status.")"
-               fi
-       done
+       git ${wt_prefix:+-C "$wt_prefix"} ${prefix:+--super-prefix "$prefix"} submodule--helper foreach ${GIT_QUIET:+--quiet} ${recursive:+--recursive} -- "$@"
 }
 
 #
@@ -467,60 +366,16 @@ cmd_init()
                shift
        done
 
-       git submodule--helper list --prefix "$wt_prefix" "$@" |
-       while read mode sha1 stage sm_path
-       do
-               die_if_unmatched "$mode"
-               name=$(git submodule--helper name "$sm_path") || exit
-
-               displaypath=$(relative_path "$sm_path")
-
-               # Copy url setting when it is not set yet
-               if test -z "$(git config "submodule.$name.url")"
-               then
-                       url=$(git config -f .gitmodules submodule."$name".url)
-                       test -z "$url" &&
-                       die "$(eval_gettext "No url found for submodule path '\$displaypath' in .gitmodules")"
-
-                       # Possibly a url relative to parent
-                       case "$url" in
-                       ./*|../*)
-                               url=$(resolve_relative_url "$url") || exit
-                               ;;
-                       esac
-                       git config submodule."$name".url "$url" ||
-                       die "$(eval_gettext "Failed to register url for submodule path '\$displaypath'")"
-
-                       say "$(eval_gettext "Submodule '\$name' (\$url) registered for path '\$displaypath'")"
-               fi
-
-               # Copy "update" setting when it is not set yet
-               if upd="$(git config -f .gitmodules submodule."$name".update)" &&
-                  test -n "$upd" &&
-                  test -z "$(git config submodule."$name".update)"
-               then
-                       case "$upd" in
-                       checkout | rebase | merge | none)
-                               ;; # known modes of updating
-                       *)
-                               echo >&2 "warning: unknown update mode '$upd' suggested for submodule '$name'"
-                               upd=none
-                               ;;
-                       esac
-                       git config submodule."$name".update "$upd" ||
-                       die "$(eval_gettext "Failed to register update mode for submodule path '\$displaypath'")"
-               fi
-       done
+       git ${wt_prefix:+-C "$wt_prefix"} ${prefix:+--super-prefix "$prefix"} submodule--helper init ${GIT_QUIET:+--quiet} -- "$@"
 }
 
 #
 # Unregister submodules from .git/config and remove their work tree
 #
-# $@ = requested paths (use '.' to deinit all submodules)
-#
 cmd_deinit()
 {
        # parse $args after "submodule ... deinit".
+       deinit_all=
        while test $# -ne 0
        do
                case "$1" in
@@ -530,6 +385,9 @@ cmd_deinit()
                -q|--quiet)
                        GIT_QUIET=1
                        ;;
+               --all)
+                       deinit_all=t
+                       ;;
                --)
                        shift
                        break
@@ -544,52 +402,29 @@ cmd_deinit()
                shift
        done
 
-       if test $# = 0
+       git ${wt_prefix:+-C "$wt_prefix"} submodule--helper deinit ${GIT_QUIET:+--quiet} ${prefix:+--prefix "$prefix"} ${force:+--force} ${deinit_all:+--all} -- "$@"
+}
+
+is_tip_reachable () (
+       sanitize_submodule_env &&
+       cd "$1" &&
+       rev=$(git rev-list -n 1 "$2" --not --all 2>/dev/null) &&
+       test -z "$rev"
+)
+
+# usage: fetch_in_submodule <module_path> [<depth>] [<sha1>]
+# Because arguments are positional, use an empty string to omit <depth>
+# but include <sha1>.
+fetch_in_submodule () (
+       sanitize_submodule_env &&
+       cd "$1" &&
+       if test $# -eq 3
        then
-               die "$(eval_gettext "Use '.' if you really want to deinitialize all submodules")"
+               echo "$3" | git fetch --stdin ${2:+"$2"}
+       else
+               git fetch ${2:+"$2"}
        fi
-
-       git submodule--helper list --prefix "$wt_prefix" "$@" |
-       while read mode sha1 stage sm_path
-       do
-               die_if_unmatched "$mode"
-               name=$(git submodule--helper name "$sm_path") || exit
-
-               displaypath=$(relative_path "$sm_path")
-
-               # Remove the submodule work tree (unless the user already did it)
-               if test -d "$sm_path"
-               then
-                       # Protect submodules containing a .git directory
-                       if test -d "$sm_path/.git"
-                       then
-                               echo >&2 "$(eval_gettext "Submodule work tree '\$displaypath' contains a .git directory")"
-                               die "$(eval_gettext "(use 'rm -rf' if you really want to remove it including all of its history)")"
-                       fi
-
-                       if test -z "$force"
-                       then
-                               git rm -qn "$sm_path" ||
-                               die "$(eval_gettext "Submodule work tree '\$displaypath' contains local modifications; use '-f' to discard them")"
-                       fi
-                       rm -rf "$sm_path" &&
-                       say "$(eval_gettext "Cleared directory '\$displaypath'")" ||
-                       say "$(eval_gettext "Could not remove submodule work tree '\$displaypath'")"
-               fi
-
-               mkdir "$sm_path" || say "$(eval_gettext "Could not create empty submodule directory '\$displaypath'")"
-
-               # Remove the .git/config entries (unless the user already did it)
-               if test -n "$(git config --get-regexp submodule."$name\.")"
-               then
-                       # Remove the whole section so we have a clean state when
-                       # the user later decides to init this submodule again
-                       url=$(git config submodule."$name".url)
-                       git config --remove-section submodule."$name" 2>/dev/null &&
-                       say "$(eval_gettext "Submodule '\$name' (\$url) unregistered for path '\$displaypath'")"
-               fi
-       done
-}
+)
 
 #
 # Update each submodule path to correct revision, using clone and checkout as needed
@@ -605,9 +440,19 @@ cmd_update()
                -q|--quiet)
                        GIT_QUIET=1
                        ;;
+               -v)
+                       unset GIT_QUIET
+                       ;;
+               --progress)
+                       progress=1
+                       ;;
                -i|--init)
                        init=1
                        ;;
+               --require-init)
+                       init=1
+                       require_init=1
+                       ;;
                --remote)
                        remote=1
                        ;;
@@ -628,6 +473,9 @@ cmd_update()
                --reference=*)
                        reference="$1"
                        ;;
+               --dissociate)
+                       dissociate=1
+                       ;;
                -m|--merge)
                        update="merge"
                        ;;
@@ -637,6 +485,12 @@ cmd_update()
                --checkout)
                        update="checkout"
                        ;;
+               --recommend-shallow)
+                       recommend_shallow="--recommend-shallow"
+                       ;;
+               --no-recommend-shallow)
+                       recommend_shallow="--no-recommend-shallow"
+                       ;;
                --depth)
                        case "$2" in '') usage ;; esac
                        depth="--depth=$2"
@@ -645,6 +499,20 @@ cmd_update()
                --depth=*)
                        depth=$1
                        ;;
+               -j|--jobs)
+                       case "$2" in '') usage ;; esac
+                       jobs="--jobs=$2"
+                       shift
+                       ;;
+               --jobs=*)
+                       jobs=$1
+                       ;;
+               --single-branch)
+                       single_branch="--single-branch"
+                       ;;
+               --no-single-branch)
+                       single_branch="--no-single-branch"
+                       ;;
                --)
                        shift
                        break
@@ -664,72 +532,55 @@ cmd_update()
                cmd_init "--" "$@" || return
        fi
 
-       cloned_modules=
-       git submodule--helper list --prefix "$wt_prefix" "$@" | {
+       {
+       git submodule--helper update-clone ${GIT_QUIET:+--quiet} \
+               ${progress:+"--progress"} \
+               ${wt_prefix:+--prefix "$wt_prefix"} \
+               ${prefix:+--recursive-prefix "$prefix"} \
+               ${update:+--update "$update"} \
+               ${reference:+"$reference"} \
+               ${dissociate:+"--dissociate"} \
+               ${depth:+--depth "$depth"} \
+               ${require_init:+--require-init} \
+               $single_branch \
+               $recommend_shallow \
+               $jobs \
+               -- \
+               "$@" || echo "#unmatched" $?
+       } | {
        err=
-       while read mode sha1 stage sm_path
+       while read -r quickabort sha1 just_cloned sm_path
        do
-               die_if_unmatched "$mode"
-               if test "$stage" = U
-               then
-                       echo >&2 "Skipping unmerged submodule $prefix$sm_path"
-                       continue
-               fi
-               name=$(git submodule--helper name "$sm_path") || exit
-               url=$(git config submodule."$name".url)
-               branch=$(get_submodule_config "$name" branch master)
-               if ! test -z "$update"
-               then
-                       update_module=$update
-               else
-                       update_module=$(git config submodule."$name".update)
-                       if test -z "$update_module"
-                       then
-                               update_module="checkout"
-                       fi
-               fi
+               die_if_unmatched "$quickabort" "$sha1"
 
-               displaypath=$(relative_path "$prefix$sm_path")
+               git submodule--helper ensure-core-worktree "$sm_path" || exit 1
 
-               if test "$update_module" = "none"
-               then
-                       echo "Skipping submodule '$displaypath'"
-                       continue
-               fi
+               update_module=$(git submodule--helper update-module-mode $just_cloned "$sm_path" $update)
 
-               if test -z "$url"
-               then
-                       # Only mention uninitialized submodules when its
-                       # path have been specified
-                       test "$#" != "0" &&
-                       say "$(eval_gettext "Submodule path '\$displaypath' not initialized
-Maybe you want to use 'update --init'?")"
-                       continue
-               fi
+               displaypath=$(git submodule--helper relative-path "$prefix$sm_path" "$wt_prefix")
 
-               if ! test -d "$sm_path"/.git && ! test -f "$sm_path"/.git
+               if test $just_cloned -eq 1
                then
-                       git submodule--helper clone ${GIT_QUIET:+--quiet} --prefix "$prefix" --path "$sm_path" --name "$name" --url "$url" "$reference" "$depth" || exit
-                       cloned_modules="$cloned_modules;$name"
                        subsha1=
                else
-                       subsha1=$(clear_local_git_env; cd "$sm_path" &&
+                       subsha1=$(sanitize_submodule_env; cd "$sm_path" &&
                                git rev-parse --verify HEAD) ||
                        die "$(eval_gettext "Unable to find current revision in submodule path '\$displaypath'")"
                fi
 
                if test -n "$remote"
                then
+                       branch=$(git submodule--helper remote-branch "$sm_path")
                        if test -z "$nofetch"
                        then
                                # Fetch remote before determining tracking $sha1
-                               (clear_local_git_env; cd "$sm_path" && git-fetch) ||
+                               fetch_in_submodule "$sm_path" $depth ||
                                die "$(eval_gettext "Unable to fetch in submodule path '\$sm_path'")"
                        fi
-                       remote_name=$(clear_local_git_env; cd "$sm_path" && get_default_remote)
-                       sha1=$(clear_local_git_env; cd "$sm_path" &&
+                       remote_name=$(sanitize_submodule_env; cd "$sm_path" && git submodule--helper print-default-remote)
+                       sha1=$(sanitize_submodule_env; cd "$sm_path" &&
                                git rev-parse --verify "${remote_name}/${branch}") ||
-                       die "$(eval_gettext "Unable to find current ${remote_name}/${branch} revision in submodule path '\$sm_path'")"
+                       die "$(eval_gettext "Unable to find current \${remote_name}/\${branch} revision in submodule path '\$sm_path'")"
                fi
 
                if test "$subsha1" != "$sha1" || test -n "$force"
@@ -745,19 +596,17 @@ Maybe you want to use 'update --init'?")"
                        then
                                # Run fetch only if $sha1 isn't present or it
                                # is not reachable from a ref.
-                               (clear_local_git_env; cd "$sm_path" &&
-                                       ( (rev=$(git rev-list -n 1 $sha1 --not --all 2>/dev/null) &&
-                                        test -z "$rev") || git-fetch)) ||
-                               die "$(eval_gettext "Unable to fetch in submodule path '\$displaypath'")"
+                               is_tip_reachable "$sm_path" "$sha1" ||
+                               fetch_in_submodule "$sm_path" $depth ||
+                               say "$(eval_gettext "Unable to fetch in submodule path '\$displaypath'; trying to directly fetch \$sha1:")"
+
+                               # Now we tried the usual fetch, but $sha1 may
+                               # not be reachable from any of the refs
+                               is_tip_reachable "$sm_path" "$sha1" ||
+                               fetch_in_submodule "$sm_path" "$depth" "$sha1" ||
+                               die "$(eval_gettext "Fetched in submodule path '\$displaypath', but it did not contain \$sha1. Direct fetching of that commit failed.")"
                        fi
 
-                       # Is this something we just cloned?
-                       case ";$cloned_modules;" in
-                       *";$name;"*)
-                               # then there is no local change to integrate
-                               update_module=checkout ;;
-                       esac
-
                        must_die_on_failure=
                        case "$update_module" in
                        checkout)
@@ -766,28 +615,28 @@ Maybe you want to use 'update --init'?")"
                                say_msg="$(eval_gettext "Submodule path '\$displaypath': checked out '\$sha1'")"
                                ;;
                        rebase)
-                               command="git rebase"
+                               command="git rebase ${GIT_QUIET:+--quiet}"
                                die_msg="$(eval_gettext "Unable to rebase '\$sha1' in submodule path '\$displaypath'")"
                                say_msg="$(eval_gettext "Submodule path '\$displaypath': rebased into '\$sha1'")"
                                must_die_on_failure=yes
                                ;;
                        merge)
-                               command="git merge"
+                               command="git merge ${GIT_QUIET:+--quiet}"
                                die_msg="$(eval_gettext "Unable to merge '\$sha1' in submodule path '\$displaypath'")"
                                say_msg="$(eval_gettext "Submodule path '\$displaypath': merged in '\$sha1'")"
                                must_die_on_failure=yes
                                ;;
                        !*)
                                command="${update_module#!}"
-                               die_msg="$(eval_gettext "Execution of '\$command \$sha1' failed in submodule path '\$prefix\$sm_path'")"
-                               say_msg="$(eval_gettext "Submodule path '\$prefix\$sm_path': '\$command \$sha1'")"
+                               die_msg="$(eval_gettext "Execution of '\$command \$sha1' failed in submodule path '\$displaypath'")"
+                               say_msg="$(eval_gettext "Submodule path '\$displaypath': '\$command \$sha1'")"
                                must_die_on_failure=yes
                                ;;
                        *)
-                               die "$(eval_gettext "Invalid update mode '$update_module' for submodule '$name'")"
+                               die "$(eval_gettext "Invalid update mode '$update_module' for submodule path '$path'")"
                        esac
 
-                       if (clear_local_git_env; cd "$sm_path" && $command "$sha1")
+                       if (sanitize_submodule_env; cd "$sm_path" && $command "$sha1")
                        then
                                say "$say_msg"
                        elif test -n "$must_die_on_failure"
@@ -802,8 +651,9 @@ Maybe you want to use 'update --init'?")"
                if test -n "$recursive"
                then
                        (
-                               prefix="$prefix$sm_path/"
-                               clear_local_git_env
+                               prefix=$(git submodule--helper relative-path "$prefix$sm_path/" "$wt_prefix")
+                               wt_prefix=
+                               sanitize_submodule_env
                                cd "$sm_path" &&
                                eval cmd_update
                        )
@@ -811,7 +661,7 @@ Maybe you want to use 'update --init'?")"
                        if test $res -gt 0
                        then
                                die_msg="$(eval_gettext "Failed to recurse into submodule path '\$displaypath'")"
-                               if test $res -eq 1
+                               if test $res -ne 2
                                then
                                        err="${err};$die_msg"
                                        continue
@@ -839,18 +689,75 @@ Maybe you want to use 'update --init'?")"
        }
 }
 
-set_name_rev () {
-       revname=$( (
-               clear_local_git_env
-               cd "$1" && {
-                       git describe "$2" 2>/dev/null ||
-                       git describe --tags "$2" 2>/dev/null ||
-                       git describe --contains "$2" 2>/dev/null ||
-                       git describe --all --always "$2"
-               }
-       ) )
-       test -z "$revname" || revname=" ($revname)"
+#
+# Configures a submodule's default branch
+#
+# $@ = requested path
+#
+cmd_set_branch() {
+       default=
+       branch=
+
+       while test $# -ne 0
+       do
+               case "$1" in
+               -q|--quiet)
+                       # we don't do anything with this but we need to accept it
+                       ;;
+               -d|--default)
+                       default=1
+                       ;;
+               -b|--branch)
+                       case "$2" in '') usage ;; esac
+                       branch=$2
+                       shift
+                       ;;
+               --)
+                       shift
+                       break
+                       ;;
+               -*)
+                       usage
+                       ;;
+               *)
+                       break
+                       ;;
+               esac
+               shift
+       done
+
+       git ${wt_prefix:+-C "$wt_prefix"} ${prefix:+--super-prefix "$prefix"} submodule--helper set-branch ${GIT_QUIET:+--quiet} ${branch:+--branch "$branch"} ${default:+--default} -- "$@"
 }
+
+#
+# Configures a submodule's remote url
+#
+# $@ = requested path, requested url
+#
+cmd_set_url() {
+       while test $# -ne 0
+       do
+               case "$1" in
+               -q|--quiet)
+                       GIT_QUIET=1
+                       ;;
+               --)
+                       shift
+                       break
+                       ;;
+               -*)
+                       usage
+                       ;;
+               *)
+                       break
+                       ;;
+               esac
+               shift
+       done
+
+       git ${wt_prefix:+-C "$wt_prefix"} ${prefix:+--super-prefix "$prefix"} submodule--helper set-url ${GIT_QUIET:+--quiet} -- "$@"
+}
+
 #
 # Show commit summary for submodules in index or working tree
 #
@@ -900,163 +807,7 @@ cmd_summary() {
                shift
        done
 
-       test $summary_limit = 0 && return
-
-       if rev=$(git rev-parse -q --verify --default HEAD ${1+"$1"})
-       then
-               head=$rev
-               test $# = 0 || shift
-       elif test -z "$1" || test "$1" = "HEAD"
-       then
-               # before the first commit: compare with an empty tree
-               head=$(git hash-object -w -t tree --stdin </dev/null)
-               test -z "$1" || shift
-       else
-               head="HEAD"
-       fi
-
-       if [ -n "$files" ]
-       then
-               test -n "$cached" &&
-               die "$(gettext "The --cached option cannot be used with the --files option")"
-               diff_cmd=diff-files
-               head=
-       fi
-
-       cd_to_toplevel
-       eval "set $(git rev-parse --sq --prefix "$wt_prefix" -- "$@")"
-       # Get modified modules cared by user
-       modules=$(git $diff_cmd $cached --ignore-submodules=dirty --raw $head -- "$@" |
-               sane_egrep '^:([0-7]* )?160000' |
-               while read mod_src mod_dst sha1_src sha1_dst status sm_path
-               do
-                       # Always show modules deleted or type-changed (blob<->module)
-                       if test "$status" = D || test "$status" = T
-                       then
-                               printf '%s\n' "$sm_path"
-                               continue
-                       fi
-                       # Respect the ignore setting for --for-status.
-                       if test -n "$for_status"
-                       then
-                               name=$(git submodule--helper name "$sm_path")
-                               ignore_config=$(get_submodule_config "$name" ignore none)
-                               test $status != A && test $ignore_config = all && continue
-                       fi
-                       # Also show added or modified modules which are checked out
-                       GIT_DIR="$sm_path/.git" git-rev-parse --git-dir >/dev/null 2>&1 &&
-                       printf '%s\n' "$sm_path"
-               done
-       )
-
-       test -z "$modules" && return
-
-       git $diff_cmd $cached --ignore-submodules=dirty --raw $head -- $modules |
-       sane_egrep '^:([0-7]* )?160000' |
-       cut -c2- |
-       while read mod_src mod_dst sha1_src sha1_dst status name
-       do
-               if test -z "$cached" &&
-                       test $sha1_dst = 0000000000000000000000000000000000000000
-               then
-                       case "$mod_dst" in
-                       160000)
-                               sha1_dst=$(GIT_DIR="$name/.git" git rev-parse HEAD)
-                               ;;
-                       100644 | 100755 | 120000)
-                               sha1_dst=$(git hash-object $name)
-                               ;;
-                       000000)
-                               ;; # removed
-                       *)
-                               # unexpected type
-                               eval_gettextln "unexpected mode \$mod_dst" >&2
-                               continue ;;
-                       esac
-               fi
-               missing_src=
-               missing_dst=
-
-               test $mod_src = 160000 &&
-               ! GIT_DIR="$name/.git" git-rev-parse -q --verify $sha1_src^0 >/dev/null &&
-               missing_src=t
-
-               test $mod_dst = 160000 &&
-               ! GIT_DIR="$name/.git" git-rev-parse -q --verify $sha1_dst^0 >/dev/null &&
-               missing_dst=t
-
-               display_name=$(relative_path "$name")
-
-               total_commits=
-               case "$missing_src,$missing_dst" in
-               t,)
-                       errmsg="$(eval_gettext "  Warn: \$display_name doesn't contain commit \$sha1_src")"
-                       ;;
-               ,t)
-                       errmsg="$(eval_gettext "  Warn: \$display_name doesn't contain commit \$sha1_dst")"
-                       ;;
-               t,t)
-                       errmsg="$(eval_gettext "  Warn: \$display_name doesn't contain commits \$sha1_src and \$sha1_dst")"
-                       ;;
-               *)
-                       errmsg=
-                       total_commits=$(
-                       if test $mod_src = 160000 && test $mod_dst = 160000
-                       then
-                               range="$sha1_src...$sha1_dst"
-                       elif test $mod_src = 160000
-                       then
-                               range=$sha1_src
-                       else
-                               range=$sha1_dst
-                       fi
-                       GIT_DIR="$name/.git" \
-                       git rev-list --first-parent $range -- | wc -l
-                       )
-                       total_commits=" ($(($total_commits + 0)))"
-                       ;;
-               esac
-
-               sha1_abbr_src=$(echo $sha1_src | cut -c1-7)
-               sha1_abbr_dst=$(echo $sha1_dst | cut -c1-7)
-               if test $status = T
-               then
-                       blob="$(gettext "blob")"
-                       submodule="$(gettext "submodule")"
-                       if test $mod_dst = 160000
-                       then
-                               echo "* $display_name $sha1_abbr_src($blob)->$sha1_abbr_dst($submodule)$total_commits:"
-                       else
-                               echo "* $display_name $sha1_abbr_src($submodule)->$sha1_abbr_dst($blob)$total_commits:"
-                       fi
-               else
-                       echo "* $display_name $sha1_abbr_src...$sha1_abbr_dst$total_commits:"
-               fi
-               if test -n "$errmsg"
-               then
-                       # Don't give error msg for modification whose dst is not submodule
-                       # i.e. deleted or changed to blob
-                       test $mod_dst = 160000 && echo "$errmsg"
-               else
-                       if test $mod_src = 160000 && test $mod_dst = 160000
-                       then
-                               limit=
-                               test $summary_limit -gt 0 && limit="-$summary_limit"
-                               GIT_DIR="$name/.git" \
-                               git log $limit --pretty='format:  %m %s' \
-                               --first-parent $sha1_src...$sha1_dst
-                       elif test $mod_dst = 160000
-                       then
-                               GIT_DIR="$name/.git" \
-                               git log --pretty='format:  > %s' -1 $sha1_dst
-                       else
-                               GIT_DIR="$name/.git" \
-                               git log --pretty='format:  < %s' -1 $sha1_src
-                       fi
-                       echo
-               fi
-               echo
-       done
+       git ${wt_prefix:+-C "$wt_prefix"} submodule--helper summary ${prefix:+--prefix "$prefix"} ${files:+--files} ${cached:+--cached} ${for_status:+--for-status} ${summary_limit:+-n $summary_limit} -- "$@"
 }
 #
 # List all submodules, prefixed with:
@@ -1097,51 +848,7 @@ cmd_status()
                shift
        done
 
-       git submodule--helper list --prefix "$wt_prefix" "$@" |
-       while read mode sha1 stage sm_path
-       do
-               die_if_unmatched "$mode"
-               name=$(git submodule--helper name "$sm_path") || exit
-               url=$(git config submodule."$name".url)
-               displaypath=$(relative_path "$prefix$sm_path")
-               if test "$stage" = U
-               then
-                       say "U$sha1 $displaypath"
-                       continue
-               fi
-               if test -z "$url" ||
-               {
-                       ! test -d "$sm_path"/.git &&
-                       ! test -f "$sm_path"/.git
-               }
-               then
-                       say "-$sha1 $displaypath"
-                       continue;
-               fi
-               if git diff-files --ignore-submodules=dirty --quiet -- "$sm_path"
-               then
-                       set_name_rev "$sm_path" "$sha1"
-                       say " $sha1 $displaypath$revname"
-               else
-                       if test -z "$cached"
-                       then
-                               sha1=$(clear_local_git_env; cd "$sm_path" && git rev-parse --verify HEAD)
-                       fi
-                       set_name_rev "$sm_path" "$sha1"
-                       say "+$sha1 $displaypath$revname"
-               fi
-
-               if test -n "$recursive"
-               then
-                       (
-                               prefix="$displaypath/"
-                               clear_local_git_env
-                               cd "$sm_path" &&
-                               eval cmd_status
-                       ) ||
-                       die "$(eval_gettext "Failed to recurse into submodule path '\$sm_path'")"
-               fi
-       done
+       git ${wt_prefix:+-C "$wt_prefix"} ${prefix:+--super-prefix "$prefix"} submodule--helper status ${GIT_QUIET:+--quiet} ${cached:+--cached} ${recursive:+--recursive} -- "$@"
 }
 #
 # Sync remote urls for submodules
@@ -1173,56 +880,13 @@ cmd_sync()
                        ;;
                esac
        done
-       cd_to_toplevel
-       git submodule--helper list --prefix "$wt_prefix" "$@" |
-       while read mode sha1 stage sm_path
-       do
-               die_if_unmatched "$mode"
-               name=$(git submodule--helper name "$sm_path")
-               url=$(git config -f .gitmodules --get submodule."$name".url)
-
-               # Possibly a url relative to parent
-               case "$url" in
-               ./*|../*)
-                       # rewrite foo/bar as ../.. to find path from
-                       # submodule work tree to superproject work tree
-                       up_path="$(printf '%s\n' "$sm_path" | sed "s/[^/][^/]*/../g")" &&
-                       # guarantee a trailing /
-                       up_path=${up_path%/}/ &&
-                       # path from submodule work tree to submodule origin repo
-                       sub_origin_url=$(resolve_relative_url "$url" "$up_path") &&
-                       # path from superproject work tree to submodule origin repo
-                       super_config_url=$(resolve_relative_url "$url") || exit
-                       ;;
-               *)
-                       sub_origin_url="$url"
-                       super_config_url="$url"
-                       ;;
-               esac
-
-               if git config "submodule.$name.url" >/dev/null 2>/dev/null
-               then
-                       displaypath=$(relative_path "$prefix$sm_path")
-                       say "$(eval_gettext "Synchronizing submodule url for '\$displaypath'")"
-                       git config submodule."$name".url "$super_config_url"
 
-                       if test -e "$sm_path"/.git
-                       then
-                       (
-                               clear_local_git_env
-                               cd "$sm_path"
-                               remote=$(get_default_remote)
-                               git config remote."$remote".url "$sub_origin_url"
+       git ${wt_prefix:+-C "$wt_prefix"} ${prefix:+--super-prefix "$prefix"} submodule--helper sync ${GIT_QUIET:+--quiet} ${recursive:+--recursive} -- "$@"
+}
 
-                               if test -n "$recursive"
-                               then
-                                       prefix="$prefix$sm_path/"
-                                       eval cmd_sync
-                               fi
-                       )
-                       fi
-               fi
-       done
+cmd_absorbgitdirs()
+{
+       git submodule--helper absorb-git-dirs --prefix "$wt_prefix" "$@"
 }
 
 # This loop parses the command line arguments to find the
@@ -1234,7 +898,7 @@ cmd_sync()
 while test $# != 0 && test -z "$command"
 do
        case "$1" in
-       add | foreach | init | deinit | update | status | summary | sync)
+       add | foreach | init | deinit | update | set-branch | set-url | status | summary | sync | absorbgitdirs)
                command=$1
                ;;
        -q|--quiet)
@@ -1275,8 +939,8 @@ then
     fi
 fi
 
-# "-b branch" is accepted only by "add"
-if test -n "$branch" && test "$command" != add
+# "-b branch" is accepted only by "add" and "set-branch"
+if test -n "$branch" && (test "$command" != add || test "$command" != set-branch)
 then
        usage
 fi
@@ -1287,4 +951,4 @@ then
        usage
 fi
 
-"cmd_$command" "$@"
+"cmd_$(echo $command | sed -e s/-/_/g)" "$@"