[PATCH 0/2] Persistent submodule pathspec specification

[PATCH 0/2] Persistent submodule pathspec specification

[Stefan Beller]

This was part of the former series 'submodule groups'.
However the labeling was ripped out and goes in its own series
sb/pathspec-label.

First we introduce a switch `--init-default-path` for `git submodule update`
which will read the pathspec to initialize the submodules not from the command
line but from `submodule.defaultUpdatePath`, which can be configured permanently.

The second patch utilizes this by having `clone` set that config option
and using that new option when calling to update the submodules.

Thanks,
Stefan

Stefan Beller (2):
  submodule update: add `--init-default-path` switch
  clone: add --init-submodule=<pathspec> switch

 6 files changed, 216 insertions(+), 14 deletions(-)
 Documentation/config.txt        |   5 ++
 Documentation/git-clone.txt     |  25 +++++---
 Documentation/git-submodule.txt |  11 +++-
 builtin/clone.c                 |  34 +++++++++-
 git-submodule.sh                |  21 ++++++-
 t/t7400-submodule-basic.sh      | 134 ++++++++++++++++++++++++++++++++++++++++

-- 
2.8.3.396.g0eed146

[PATCH 1/2] submodule update: add `--init-default-path` switch

[Stefan Beller]

The new switch `--init-default-path` initializes the submodules which are
configured in `submodule.defaultUpdatePath` instead of those given as
command line arguments before updating. In the first implementation this
is made incompatible with further command line arguments as it is
unclear what the user means by

    git submodule update --init --init-default-path <paths>

This new switch allows to record more complex patterns as it saves
retyping them whenever you invoke update.

Signed-off-by: Stefan Beller <sbeller@google.com>
---
 Documentation/config.txt        |  5 ++++
 Documentation/git-submodule.txt | 11 ++++++++-
 git-submodule.sh                | 21 +++++++++++++---
 t/t7400-submodule-basic.sh      | 53 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 86 insertions(+), 4 deletions(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index e4cd291..121b236 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -2786,6 +2786,11 @@ submodule.fetchJobs::
 	in parallel. A value of 0 will give some reasonable default.
 	If unset, it defaults to 1.
 
+submodule.defaultUpdatePath::
+	Specifies a set of submodules to initialize when calling
+	`git submodule --init-default-group` by using the pathspec
+	syntax.
+
 tag.forceSignAnnotated::
 	A boolean to specify whether annotated tags created should be GPG signed.
 	If `--annotate` is specified on the command line, it takes
diff --git a/Documentation/git-submodule.txt b/Documentation/git-submodule.txt
index 9226c43..000231e 100644
--- a/Documentation/git-submodule.txt
+++ b/Documentation/git-submodule.txt
@@ -14,7 +14,7 @@ SYNOPSIS
 'git submodule' [--quiet] status [--cached] [--recursive] [--] [<path>...]
 'git submodule' [--quiet] init [--] [<path>...]
 'git submodule' [--quiet] deinit [-f|--force] (--all|[--] <path>...)
-'git submodule' [--quiet] update [--init] [--remote] [-N|--no-fetch]
+'git submodule' [--quiet] update [--init[-default-path]] [--remote] [-N|--no-fetch]
 	      [-f|--force] [--rebase|--merge] [--reference <repository>]
 	      [--depth <depth>] [--recursive] [--jobs <n>] [--] [<path>...]
 'git submodule' [--quiet] summary [--cached|--files] [(-n|--summary-limit) <n>]
@@ -193,6 +193,10 @@ If the submodule is not yet initialized, and you just want to use the
 setting as stored in .gitmodules, you can automatically initialize the
 submodule with the `--init` option.
 
+You can configure a set of submodules using pathspec syntax in
+submodule.defaultUpdatePath you can use `--init-default-path` to initialize
+those before updating.
+
 If `--recursive` is specified, this command will recurse into the
 registered submodules, and update any nested submodules within.
 --
@@ -360,6 +364,11 @@ the submodule itself.
 	Initialize all submodules for which "git submodule init" has not been
 	called so far before updating.
 
+--init-default-path::
+	This option is only valid for the update command.
+	Initialize all submodules configured in "`submodule.defaultUpdatePath`"
+	that have not been updated before.
+
 --name::
 	This option is only valid for the add command. It sets the submodule's
 	name to the given string instead of defaulting to its path. The name
diff --git a/git-submodule.sh b/git-submodule.sh
index 5a4dec0..3d12145 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -9,7 +9,7 @@ USAGE="[--quiet] add [-b <branch>] [-f|--force] [--name <name>] [--reference <re
    or: $dashless [--quiet] status [--cached] [--recursive] [--] [<path>...]
    or: $dashless [--quiet] init [--] [<path>...]
    or: $dashless [--quiet] deinit [-f|--force] (--all| [--] <path>...)
-   or: $dashless [--quiet] update [--init] [--remote] [-N|--no-fetch] [-f|--force] [--checkout|--merge|--rebase] [--reference <repository>] [--recursive] [--] [<path>...]
+   or: $dashless [--quiet] update [--init[-default-path]] [--remote] [-N|--no-fetch] [-f|--force] [--checkout|--merge|--rebase] [--reference <repository>] [--recursive] [--] [<path>...]
    or: $dashless [--quiet] summary [--cached|--files] [--summary-limit <n>] [commit] [--] [<path>...]
    or: $dashless [--quiet] foreach [--recursive] <command>
    or: $dashless [--quiet] sync [--recursive] [--] [<path>...]"
@@ -528,7 +528,12 @@ cmd_update()
 			GIT_QUIET=1
 			;;
 		-i|--init)
-			init=1
+			test -z $init || test $init = by_args || die "$(gettext "Only one of --init or --init-default-path may be used.")"
+			init=by_args
+			;;
+		--init-default-path)
+			test -z $init || test $init = by_config || die "$(gettext "Only one of --init or --init-default-path may be used.")"
+			init=by_config
 			;;
 		--remote)
 			remote=1
@@ -591,7 +596,17 @@ cmd_update()
 
 	if test -n "$init"
 	then
-		cmd_init "--" "$@" || return
+		if test "$init" = "by_config"
+		then
+			if test $# -gt 0
+			then
+				die "$(gettext "path arguments are incompatible with --init-default-path")"
+			fi
+			cmd_init "--" $(git config --get-all submodule.defaultUpdatePath) || return
+		else
+			cmd_init "--" "$@" || return
+		fi
+
 	fi
 
 	{
diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
index 3570f7b..4173c72 100755
--- a/t/t7400-submodule-basic.sh
+++ b/t/t7400-submodule-basic.sh
@@ -1116,5 +1116,58 @@ test_expect_success 'submodule helper list is not confused by common prefixes' '
 	test_cmp expect actual
 '
 
+test_expect_success 'setup superproject with submodules' '
+	mkdir sub1 &&
+	(
+		cd sub1 &&
+		git init &&
+		test_commit test
+		test_commit test2
+	) &&
+	mkdir multisuper &&
+	(
+		cd multisuper &&
+		git init &&
+		git submodule add ../sub1 sub0 &&
+		git submodule add ../sub1 sub1 &&
+		git submodule add ../sub1 sub2 &&
+		git submodule add ../sub1 sub3 &&
+		git commit -m "add some submodules"
+	)
+'
+
+cat >expect <<-EOF
+-sub0
+ sub1 (test2)
+ sub2 (test2)
+ sub3 (test2)
+EOF
+
+test_expect_success 'submodule update --init with a specification' '
+	test_when_finished "rm -rf multisuper_clone" &&
+	pwd=$(pwd) &&
+	git clone file://"$pwd"/multisuper multisuper_clone &&
+	(
+		cd multisuper_clone &&
+		git submodule update --init . ":(exclude)sub0" &&
+		git submodule status |cut -c 1,43- >../actual
+	) &&
+	test_cmp expect actual
+'
+
+test_expect_success 'submodule update --init-default-path' '
+	test_when_finished "rm -rf multisuper_clone" &&
+	pwd=$(pwd) &&
+	git clone file://"$pwd"/multisuper multisuper_clone &&
+	(
+		cd multisuper_clone &&
+		git config submodule.defaultUpdatePath "." &&
+		git config --add submodule.defaultUpdatePath ":(exclude)sub0" &&
+		git submodule update --init-default-path &&
+		git submodule status |cut -c 1,43- >../actual &&
+		test_must_fail git submodule update --init-default-path sub0
+	) &&
+	test_cmp expect actual
+'
 
 test_done
-- 
2.8.3.395.ga2acc22.dirty

[PATCH 2/2] clone: add --init-submodule=<pathspec> switch

[Stefan Beller]

The new switch passes the pathspec to `git submodule update --init`
which is called after the actual clone is done.

Additionally this configures the submodule.defaultUpdatePath to
be the given pathspec, such that any future invocation of
`git submodule update --init-default-paths` will keep up
with the pathspec.

Signed-off-by: Stefan Beller <sbeller@google.com>
---
 Documentation/git-clone.txt | 25 +++++++++-----
 builtin/clone.c             | 34 +++++++++++++++++--
 t/t7400-submodule-basic.sh  | 81 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 130 insertions(+), 10 deletions(-)

diff --git a/Documentation/git-clone.txt b/Documentation/git-clone.txt
index 1b15cd7..33e5894 100644
--- a/Documentation/git-clone.txt
+++ b/Documentation/git-clone.txt
@@ -14,8 +14,9 @@ SYNOPSIS
 	  [-o <name>] [-b <name>] [-u <upload-pack>] [--reference <repository>]
 	  [--dissociate] [--separate-git-dir <git dir>]
 	  [--depth <depth>] [--[no-]single-branch]
-	  [--recursive | --recurse-submodules] [--[no-]shallow-submodules]
-	  [--jobs <n>] [--] <repository> [<directory>]
+	  [--recursive | --recurse-submodules] [--jobs <n>]
+	  [--init-submodule <submodulespec>] [--] <repository>
+	  [<directory>]
 
 DESCRIPTION
 -----------
@@ -207,12 +208,20 @@ objects from the source repository into a pack in the cloned repository.
 
 --recursive::
 --recurse-submodules::
-	After the clone is created, initialize all submodules within,
-	using their default settings. This is equivalent to running
-	`git submodule update --init --recursive` immediately after
-	the clone is finished. This option is ignored if the cloned
-	repository does not have a worktree/checkout (i.e. if any of
-	`--no-checkout`/`-n`, `--bare`, or `--mirror` is given)
+	After the clone is created, initialize and clone all submodules
+	within, using their default settings. This is equivalent to
+	running `git submodule update --recursive --init `
+	immediately after the clone is finished. This option is ignored
+	if the cloned repository does not have a worktree/checkout (i.e.
+	if any of `--no-checkout`/`-n`, `--bare`, or `--mirror` is given)
+
+--init-submodule::
+	After the clone is created, initialize and clone specified
+	submodules within, using their default settings. It is possible
+	to give multiple specifications by giving this argument multiple
+	times. This is equivalent to configure `submodule.defaultUpdateGroup`
+	and then running `git submodule update --init-default-path`
+	immediately after the clone is finished.
 
 --[no-]shallow-submodules::
 	All submodules which are cloned will be shallow with a depth of 1.
diff --git a/builtin/clone.c b/builtin/clone.c
index 5f867e6..56967f9 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -53,6 +53,16 @@ static struct string_list option_config;
 static struct string_list option_reference;
 static int option_dissociate;
 static int max_jobs = -1;
+static struct string_list init_submodules;
+
+static int init_submodules_cb(const struct option *opt, const char *arg, int unset)
+{
+	if (unset)
+		return -1;
+
+	string_list_append((struct string_list *)opt->value, arg);
+	return 0;
+}
 
 static struct option builtin_clone_options[] = {
 	OPT__VERBOSITY(&option_verbosity),
@@ -103,6 +113,9 @@ static struct option builtin_clone_options[] = {
 			TRANSPORT_FAMILY_IPV4),
 	OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
 			TRANSPORT_FAMILY_IPV6),
+	OPT_CALLBACK(0, "init-submodule", &init_submodules, N_("<pathspec>"),
+			N_("clone specific submodules. Pass ultiple times for complex pathspecs"),
+			init_submodules_cb),
 	OPT_END()
 };
 
@@ -734,14 +747,22 @@ static int checkout(void)
 	err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
 			   sha1_to_hex(sha1), "1", NULL);
 
-	if (!err && option_recursive) {
+	if (!err && (option_recursive || init_submodules.nr > 0)) {
 		struct argv_array args = ARGV_ARRAY_INIT;
-		argv_array_pushl(&args, "submodule", "update", "--init", "--recursive", NULL);
+		argv_array_pushl(&args, "submodule", "update", NULL);
+
+		if (init_submodules.nr > 0)
+			argv_array_pushf(&args, "--init-default-path");
+		else
+			argv_array_pushf(&args, "--init");
 
 		if (option_shallow_submodules == 1
 		    || (option_shallow_submodules == -1 && option_depth))
 			argv_array_push(&args, "--depth=1");
 
+		if (option_recursive)
+			argv_array_pushf(&args, "--recursive");
+
 		if (max_jobs != -1)
 			argv_array_pushf(&args, "--jobs=%d", max_jobs);
 
@@ -883,6 +904,15 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 		option_no_checkout = 1;
 	}
 
+	if (init_submodules.nr > 0) {
+		struct string_list_item *item;
+		struct strbuf sb = STRBUF_INIT;
+		for_each_string_list_item(item, &init_submodules) {
+			strbuf_addf(&sb, "submodule.defaultUpdatePath=%s", item->string);
+			string_list_append(&option_config, strbuf_detach(&sb, 0));
+		}
+	}
+
 	if (!option_origin)
 		option_origin = "origin";
 
diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
index 4173c72..af5d0ce 100755
--- a/t/t7400-submodule-basic.sh
+++ b/t/t7400-submodule-basic.sh
@@ -1170,4 +1170,85 @@ test_expect_success 'submodule update --init-default-path' '
 	test_cmp expect actual
 '
 
+cat <<EOF > expected
+ sub0 (test2)
+-sub1
+-sub2
+-sub3
+EOF
+
+test_expect_success 'clone --init-submodule works' '
+	test_when_finished "rm -rf multisuper_clone" &&
+	git clone --recurse-submodules --init-submodule="sub0" multisuper multisuper_clone &&
+	(
+		cd multisuper_clone &&
+		git submodule status |cut -c 1,43- >../actual
+	) &&
+	test_cmp actual expected
+'
+
+cat <<EOF > expect
+-sub0
+ sub1 (test2)
+-sub2
+ sub3 (test2)
+EOF
+test_expect_success 'clone with multiple --init-submodule options' '
+	test_when_finished "rm -rf multisuper_clone" &&
+	git clone --recurse-submodules \
+		  --init-submodule="." \
+		  --init-submodule ":(exclude)sub0" \
+		  --init-submodule ":(exclude)sub2" \
+			multisuper multisuper_clone &&
+	(
+		cd multisuper_clone &&
+		git submodule status |cut -c1,43- >../actual
+	) &&
+	test_cmp expect actual
+'
+
+cat <<EOF > expect
+-sub0
+ sub1 (test2)
+-sub2
+ sub3 (test2)
+EOF
+
+cat <<EOF > expect2
+-sub0
+ sub1 (test2)
+-sub2
+ sub3 (test2)
+-sub4
+ sub5 (test2)
+EOF
+
+test_expect_success 'clone and subsequent updates correctly auto-initialize submodules' '
+	test_when_finished "rm -rf multisuper_clone" &&
+	git clone --recurse-submodules --init-submodule="." \
+				       --init-submodule ":(exclude)sub0" \
+				       --init-submodule ":(exclude)sub2" \
+				       --init-submodule ":(exclude)sub4" \
+				       multisuper multisuper_clone &&
+	(
+		cd multisuper_clone &&
+		git submodule status |cut -c1,43- >../actual
+	) &&
+	test_cmp expect actual &&
+	(
+		cd multisuper &&
+		git submodule add ../sub1 sub4 &&
+		git submodule add ../sub1 sub5 &&
+		git commit -m "add more submodules"
+	) &&
+	(
+		cd multisuper_clone &&
+		# obtain the new superproject
+		git pull &&
+		git submodule update --init-default-path &&
+		git submodule status |cut -c1,43- >../actual
+	) &&
+	test_cmp expect2 actual
+'
+
 test_done
-- 
2.8.3.395.ga2acc22.dirty

[PATCHv2 0/2] Persistent submodule pathspec specification

[Stefan Beller]

Changes since v1:
 * fixed a broken && chain in a subshell for testing, as pointed out by Eric!

This was part of the former series 'submodule groups'.
However the labeling was ripped out and goes in its own series
sb/pathspec-label.

First we introduce a switch `--init-default-path` for `git submodule update`
which will read the pathspec to initialize the submodules not from the command
line but from `submodule.defaultUpdatePath`, which can be configured permanently.

The second patch utilizes this by having `clone` set that config option
and using that new option when calling to update the submodules.

Thanks,
Stefan

Stefan Beller (2):
  submodule update: add `--init-default-path` switch
  clone: add --init-submodule=<pathspec> switch

 6 files changed, 216 insertions(+), 14 deletions(-)
 Documentation/config.txt        |   5 ++
 Documentation/git-clone.txt     |  25 +++++---
 Documentation/git-submodule.txt |  11 +++-
 builtin/clone.c                 |  34 +++++++++-
 git-submodule.sh                |  21 ++++++-
 t/t7400-submodule-basic.sh      | 134 ++++++++++++++++++++++++++++++++++++++++

-- 
2.8.3.396.g0eed146

[PATCH 2/2] clone: add --init-submodule=<pathspec> switch

[Stefan Beller]

The new switch passes the pathspec to `git submodule update --init`
which is called after the actual clone is done.

Additionally this configures the submodule.defaultUpdatePath to
be the given pathspec, such that any future invocation of
`git submodule update --init-default-paths` will keep up
with the pathspec.

Signed-off-by: Stefan Beller <sbeller@google.com>
---
 Documentation/git-clone.txt | 25 +++++++++-----
 builtin/clone.c             | 34 +++++++++++++++++--
 t/t7400-submodule-basic.sh  | 81 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 130 insertions(+), 10 deletions(-)

diff --git a/Documentation/git-clone.txt b/Documentation/git-clone.txt
index 1b15cd7..33e5894 100644
--- a/Documentation/git-clone.txt
+++ b/Documentation/git-clone.txt
@@ -14,8 +14,9 @@ SYNOPSIS
 	  [-o <name>] [-b <name>] [-u <upload-pack>] [--reference <repository>]
 	  [--dissociate] [--separate-git-dir <git dir>]
 	  [--depth <depth>] [--[no-]single-branch]
-	  [--recursive | --recurse-submodules] [--[no-]shallow-submodules]
-	  [--jobs <n>] [--] <repository> [<directory>]
+	  [--recursive | --recurse-submodules] [--jobs <n>]
+	  [--init-submodule <submodulespec>] [--] <repository>
+	  [<directory>]
 
 DESCRIPTION
 -----------
@@ -207,12 +208,20 @@ objects from the source repository into a pack in the cloned repository.
 
 --recursive::
 --recurse-submodules::
-	After the clone is created, initialize all submodules within,
-	using their default settings. This is equivalent to running
-	`git submodule update --init --recursive` immediately after
-	the clone is finished. This option is ignored if the cloned
-	repository does not have a worktree/checkout (i.e. if any of
-	`--no-checkout`/`-n`, `--bare`, or `--mirror` is given)
+	After the clone is created, initialize and clone all submodules
+	within, using their default settings. This is equivalent to
+	running `git submodule update --recursive --init `
+	immediately after the clone is finished. This option is ignored
+	if the cloned repository does not have a worktree/checkout (i.e.
+	if any of `--no-checkout`/`-n`, `--bare`, or `--mirror` is given)
+
+--init-submodule::
+	After the clone is created, initialize and clone specified
+	submodules within, using their default settings. It is possible
+	to give multiple specifications by giving this argument multiple
+	times. This is equivalent to configure `submodule.defaultUpdateGroup`
+	and then running `git submodule update --init-default-path`
+	immediately after the clone is finished.
 
 --[no-]shallow-submodules::
 	All submodules which are cloned will be shallow with a depth of 1.
diff --git a/builtin/clone.c b/builtin/clone.c
index 5f867e6..56967f9 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -53,6 +53,16 @@ static struct string_list option_config;
 static struct string_list option_reference;
 static int option_dissociate;
 static int max_jobs = -1;
+static struct string_list init_submodules;
+
+static int init_submodules_cb(const struct option *opt, const char *arg, int unset)
+{
+	if (unset)
+		return -1;
+
+	string_list_append((struct string_list *)opt->value, arg);
+	return 0;
+}
 
 static struct option builtin_clone_options[] = {
 	OPT__VERBOSITY(&option_verbosity),
@@ -103,6 +113,9 @@ static struct option builtin_clone_options[] = {
 			TRANSPORT_FAMILY_IPV4),
 	OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
 			TRANSPORT_FAMILY_IPV6),
+	OPT_CALLBACK(0, "init-submodule", &init_submodules, N_("<pathspec>"),
+			N_("clone specific submodules. Pass ultiple times for complex pathspecs"),
+			init_submodules_cb),
 	OPT_END()
 };
 
@@ -734,14 +747,22 @@ static int checkout(void)
 	err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
 			   sha1_to_hex(sha1), "1", NULL);
 
-	if (!err && option_recursive) {
+	if (!err && (option_recursive || init_submodules.nr > 0)) {
 		struct argv_array args = ARGV_ARRAY_INIT;
-		argv_array_pushl(&args, "submodule", "update", "--init", "--recursive", NULL);
+		argv_array_pushl(&args, "submodule", "update", NULL);
+
+		if (init_submodules.nr > 0)
+			argv_array_pushf(&args, "--init-default-path");
+		else
+			argv_array_pushf(&args, "--init");
 
 		if (option_shallow_submodules == 1
 		    || (option_shallow_submodules == -1 && option_depth))
 			argv_array_push(&args, "--depth=1");
 
+		if (option_recursive)
+			argv_array_pushf(&args, "--recursive");
+
 		if (max_jobs != -1)
 			argv_array_pushf(&args, "--jobs=%d", max_jobs);
 
@@ -883,6 +904,15 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 		option_no_checkout = 1;
 	}
 
+	if (init_submodules.nr > 0) {
+		struct string_list_item *item;
+		struct strbuf sb = STRBUF_INIT;
+		for_each_string_list_item(item, &init_submodules) {
+			strbuf_addf(&sb, "submodule.defaultUpdatePath=%s", item->string);
+			string_list_append(&option_config, strbuf_detach(&sb, 0));
+		}
+	}
+
 	if (!option_origin)
 		option_origin = "origin";
 
diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
index 112d86a..a8d45cda 100755
--- a/t/t7400-submodule-basic.sh
+++ b/t/t7400-submodule-basic.sh
@@ -1170,4 +1170,85 @@ test_expect_success 'submodule update --init-default-path' '
 	test_cmp expect actual
 '
 
+cat <<EOF > expected
+ sub0 (test2)
+-sub1
+-sub2
+-sub3
+EOF
+
+test_expect_success 'clone --init-submodule works' '
+	test_when_finished "rm -rf multisuper_clone" &&
+	git clone --recurse-submodules --init-submodule="sub0" multisuper multisuper_clone &&
+	(
+		cd multisuper_clone &&
+		git submodule status |cut -c 1,43- >../actual
+	) &&
+	test_cmp actual expected
+'
+
+cat <<EOF > expect
+-sub0
+ sub1 (test2)
+-sub2
+ sub3 (test2)
+EOF
+test_expect_success 'clone with multiple --init-submodule options' '
+	test_when_finished "rm -rf multisuper_clone" &&
+	git clone --recurse-submodules \
+		  --init-submodule="." \
+		  --init-submodule ":(exclude)sub0" \
+		  --init-submodule ":(exclude)sub2" \
+			multisuper multisuper_clone &&
+	(
+		cd multisuper_clone &&
+		git submodule status |cut -c1,43- >../actual
+	) &&
+	test_cmp expect actual
+'
+
+cat <<EOF > expect
+-sub0
+ sub1 (test2)
+-sub2
+ sub3 (test2)
+EOF
+
+cat <<EOF > expect2
+-sub0
+ sub1 (test2)
+-sub2
+ sub3 (test2)
+-sub4
+ sub5 (test2)
+EOF
+
+test_expect_success 'clone and subsequent updates correctly auto-initialize submodules' '
+	test_when_finished "rm -rf multisuper_clone" &&
+	git clone --recurse-submodules --init-submodule="." \
+				       --init-submodule ":(exclude)sub0" \
+				       --init-submodule ":(exclude)sub2" \
+				       --init-submodule ":(exclude)sub4" \
+				       multisuper multisuper_clone &&
+	(
+		cd multisuper_clone &&
+		git submodule status |cut -c1,43- >../actual
+	) &&
+	test_cmp expect actual &&
+	(
+		cd multisuper &&
+		git submodule add ../sub1 sub4 &&
+		git submodule add ../sub1 sub5 &&
+		git commit -m "add more submodules"
+	) &&
+	(
+		cd multisuper_clone &&
+		# obtain the new superproject
+		git pull &&
+		git submodule update --init-default-path &&
+		git submodule status |cut -c1,43- >../actual
+	) &&
+	test_cmp expect2 actual
+'
+
 test_done
-- 
2.8.3.397.g0b71a98

[PATCHv3 0/2] Persistent submodule pathspec specification

[Stefan Beller]

Changes since v2:
 * I replaced one 0 by NULL as pointed out by Ramsay, and reformatted the line
   to stay within 80 characters:
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -908,8 +908,10 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
                struct string_list_item *item;
                struct strbuf sb = STRBUF_INIT;
                for_each_string_list_item(item, &init_submodules) {
-                       strbuf_addf(&sb, "submodule.defaultUpdatePath=%s", item->string);
-                       string_list_append(&option_config, strbuf_detach(&sb, 0));
+                       strbuf_addf(&sb, "submodule.defaultUpdatePath=%s",
+                                   item->string);
+                       string_list_append(&option_config,
+                                          strbuf_detach(&sb, NULL));
                }
        }
 

Changes since v1:
 * fixed a broken && chain in a subshell for testing, as pointed out by Eric!

This was part of the former series 'submodule groups'.
However the labeling was ripped out and goes in its own series
sb/pathspec-label.

First we introduce a switch `--init-default-path` for `git submodule update`
which will read the pathspec to initialize the submodules not from the command
line but from `submodule.defaultUpdatePath`, which can be configured permanently.

The second patch utilizes this by having `clone` set that config option
and using that new option when calling to update the submodules.

Thanks,
Stefan

Stefan Beller (2):
  submodule update: add `--init-default-path` switch
  clone: add --init-submodule=<pathspec> switch

 Documentation/config.txt        |   5 ++
 Documentation/git-clone.txt     |  25 +++++---
 Documentation/git-submodule.txt |  11 +++-
 builtin/clone.c                 |  36 ++++++++++-
 git-submodule.sh                |  21 ++++++-
 t/t7400-submodule-basic.sh      | 134 ++++++++++++++++++++++++++++++++++++++++
 6 files changed, 218 insertions(+), 14 deletions(-)

-- 
2.9.0.rc0.2.g145fc64

base-commit: 3a0f269e7c82aa3a87323cb7ae04ac5f129f036b

[PATCH 2/2] clone: add --init-submodule=<pathspec> switch

[Stefan Beller]

The new switch passes the pathspec to `git submodule update --init`
which is called after the actual clone is done.

Additionally this configures the submodule.defaultUpdatePath to
be the given pathspec, such that any future invocation of
`git submodule update --init-default-paths` will keep up
with the pathspec.

Signed-off-by: Stefan Beller <sbeller@google.com>
---
 Documentation/git-clone.txt | 25 +++++++++-----
 builtin/clone.c             | 36 ++++++++++++++++++--
 t/t7400-submodule-basic.sh  | 81 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 132 insertions(+), 10 deletions(-)

diff --git a/Documentation/git-clone.txt b/Documentation/git-clone.txt
index 1b15cd7..33e5894 100644
--- a/Documentation/git-clone.txt
+++ b/Documentation/git-clone.txt
@@ -14,8 +14,9 @@ SYNOPSIS
 	  [-o <name>] [-b <name>] [-u <upload-pack>] [--reference <repository>]
 	  [--dissociate] [--separate-git-dir <git dir>]
 	  [--depth <depth>] [--[no-]single-branch]
-	  [--recursive | --recurse-submodules] [--[no-]shallow-submodules]
-	  [--jobs <n>] [--] <repository> [<directory>]
+	  [--recursive | --recurse-submodules] [--jobs <n>]
+	  [--init-submodule <submodulespec>] [--] <repository>
+	  [<directory>]
 
 DESCRIPTION
 -----------
@@ -207,12 +208,20 @@ objects from the source repository into a pack in the cloned repository.
 
 --recursive::
 --recurse-submodules::
-	After the clone is created, initialize all submodules within,
-	using their default settings. This is equivalent to running
-	`git submodule update --init --recursive` immediately after
-	the clone is finished. This option is ignored if the cloned
-	repository does not have a worktree/checkout (i.e. if any of
-	`--no-checkout`/`-n`, `--bare`, or `--mirror` is given)
+	After the clone is created, initialize and clone all submodules
+	within, using their default settings. This is equivalent to
+	running `git submodule update --recursive --init `
+	immediately after the clone is finished. This option is ignored
+	if the cloned repository does not have a worktree/checkout (i.e.
+	if any of `--no-checkout`/`-n`, `--bare`, or `--mirror` is given)
+
+--init-submodule::
+	After the clone is created, initialize and clone specified
+	submodules within, using their default settings. It is possible
+	to give multiple specifications by giving this argument multiple
+	times. This is equivalent to configure `submodule.defaultUpdateGroup`
+	and then running `git submodule update --init-default-path`
+	immediately after the clone is finished.
 
 --[no-]shallow-submodules::
 	All submodules which are cloned will be shallow with a depth of 1.
diff --git a/builtin/clone.c b/builtin/clone.c
index 5f867e6..668c1f4 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -53,6 +53,16 @@ static struct string_list option_config;
 static struct string_list option_reference;
 static int option_dissociate;
 static int max_jobs = -1;
+static struct string_list init_submodules;
+
+static int init_submodules_cb(const struct option *opt, const char *arg, int unset)
+{
+	if (unset)
+		return -1;
+
+	string_list_append((struct string_list *)opt->value, arg);
+	return 0;
+}
 
 static struct option builtin_clone_options[] = {
 	OPT__VERBOSITY(&option_verbosity),
@@ -103,6 +113,9 @@ static struct option builtin_clone_options[] = {
 			TRANSPORT_FAMILY_IPV4),
 	OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
 			TRANSPORT_FAMILY_IPV6),
+	OPT_CALLBACK(0, "init-submodule", &init_submodules, N_("<pathspec>"),
+			N_("clone specific submodules. Pass ultiple times for complex pathspecs"),
+			init_submodules_cb),
 	OPT_END()
 };
 
@@ -734,14 +747,22 @@ static int checkout(void)
 	err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
 			   sha1_to_hex(sha1), "1", NULL);
 
-	if (!err && option_recursive) {
+	if (!err && (option_recursive || init_submodules.nr > 0)) {
 		struct argv_array args = ARGV_ARRAY_INIT;
-		argv_array_pushl(&args, "submodule", "update", "--init", "--recursive", NULL);
+		argv_array_pushl(&args, "submodule", "update", NULL);
+
+		if (init_submodules.nr > 0)
+			argv_array_pushf(&args, "--init-default-path");
+		else
+			argv_array_pushf(&args, "--init");
 
 		if (option_shallow_submodules == 1
 		    || (option_shallow_submodules == -1 && option_depth))
 			argv_array_push(&args, "--depth=1");
 
+		if (option_recursive)
+			argv_array_pushf(&args, "--recursive");
+
 		if (max_jobs != -1)
 			argv_array_pushf(&args, "--jobs=%d", max_jobs);
 
@@ -883,6 +904,17 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 		option_no_checkout = 1;
 	}
 
+	if (init_submodules.nr > 0) {
+		struct string_list_item *item;
+		struct strbuf sb = STRBUF_INIT;
+		for_each_string_list_item(item, &init_submodules) {
+			strbuf_addf(&sb, "submodule.defaultUpdatePath=%s",
+				    item->string);
+			string_list_append(&option_config,
+					   strbuf_detach(&sb, NULL));
+		}
+	}
+
 	if (!option_origin)
 		option_origin = "origin";
 
diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
index 112d86a..a8d45cda 100755
--- a/t/t7400-submodule-basic.sh
+++ b/t/t7400-submodule-basic.sh
@@ -1170,4 +1170,85 @@ test_expect_success 'submodule update --init-default-path' '
 	test_cmp expect actual
 '
 
+cat <<EOF > expected
+ sub0 (test2)
+-sub1
+-sub2
+-sub3
+EOF
+
+test_expect_success 'clone --init-submodule works' '
+	test_when_finished "rm -rf multisuper_clone" &&
+	git clone --recurse-submodules --init-submodule="sub0" multisuper multisuper_clone &&
+	(
+		cd multisuper_clone &&
+		git submodule status |cut -c 1,43- >../actual
+	) &&
+	test_cmp actual expected
+'
+
+cat <<EOF > expect
+-sub0
+ sub1 (test2)
+-sub2
+ sub3 (test2)
+EOF
+test_expect_success 'clone with multiple --init-submodule options' '
+	test_when_finished "rm -rf multisuper_clone" &&
+	git clone --recurse-submodules \
+		  --init-submodule="." \
+		  --init-submodule ":(exclude)sub0" \
+		  --init-submodule ":(exclude)sub2" \
+			multisuper multisuper_clone &&
+	(
+		cd multisuper_clone &&
+		git submodule status |cut -c1,43- >../actual
+	) &&
+	test_cmp expect actual
+'
+
+cat <<EOF > expect
+-sub0
+ sub1 (test2)
+-sub2
+ sub3 (test2)
+EOF
+
+cat <<EOF > expect2
+-sub0
+ sub1 (test2)
+-sub2
+ sub3 (test2)
+-sub4
+ sub5 (test2)
+EOF
+
+test_expect_success 'clone and subsequent updates correctly auto-initialize submodules' '
+	test_when_finished "rm -rf multisuper_clone" &&
+	git clone --recurse-submodules --init-submodule="." \
+				       --init-submodule ":(exclude)sub0" \
+				       --init-submodule ":(exclude)sub2" \
+				       --init-submodule ":(exclude)sub4" \
+				       multisuper multisuper_clone &&
+	(
+		cd multisuper_clone &&
+		git submodule status |cut -c1,43- >../actual
+	) &&
+	test_cmp expect actual &&
+	(
+		cd multisuper &&
+		git submodule add ../sub1 sub4 &&
+		git submodule add ../sub1 sub5 &&
+		git commit -m "add more submodules"
+	) &&
+	(
+		cd multisuper_clone &&
+		# obtain the new superproject
+		git pull &&
+		git submodule update --init-default-path &&
+		git submodule status |cut -c1,43- >../actual
+	) &&
+	test_cmp expect2 actual
+'
+
 test_done
-- 
2.9.0.rc0.2.g145fc64