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 <sbel...@google.com>
Signed-off-by: Junio C Hamano <gits...@pobox.com>
---
 Documentation/git-clone.txt | 23 +++++++++----
 builtin/clone.c             | 36 ++++++++++++++++++--
 t/t7400-submodule-basic.sh  | 81 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 131 insertions(+), 9 deletions(-)

diff --git a/Documentation/git-clone.txt b/Documentation/git-clone.txt
index 35cc34b2fb..1089f3812c 100644
--- a/Documentation/git-clone.txt
+++ b/Documentation/git-clone.txt
@@ -15,7 +15,8 @@ SYNOPSIS
          [--dissociate] [--separate-git-dir <git dir>]
          [--depth <depth>] [--[no-]single-branch]
          [--recursive | --recurse-submodules] [--[no-]shallow-submodules]
-         [--jobs <n>] [--] <repository> [<directory>]
+         [--init-submodule <pathspec>] [--jobs <n>] [--]
+         <repository> [<directory>]
 
 DESCRIPTION
 -----------
@@ -217,12 +218,20 @@ 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 6c76a6ed66..748e7c0c19 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -56,6 +56,16 @@ static struct string_list option_required_reference = 
STRING_LIST_INIT_NODUP;
 static struct string_list option_optional_reference = STRING_LIST_INIT_NODUP;
 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),
@@ -112,6 +122,9 @@ 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 multiple times for 
complex pathspecs"),
+                       init_submodules_cb),
        OPT_END()
 };
 
@@ -733,13 +746,21 @@ static int checkout(int submodule_progress)
        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)
                        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);
 
@@ -887,6 +908,17 @@ 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 4699b1c532..90f9030541 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
-- 
2.10.1.714.ge3da0db

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