Submodules: Add the "fetchRecurseSubmodules" config option

The new boolean "fetchRecurseSubmodules" config option controls the
behavior for "git fetch" and "git pull". It specifies if these commands
should recurse into submodules and fetch new commits there too and can be
set separately for each submodule.

In the .gitmodules file "submodule.<name>.fetchRecurseSubmodules" entries
are read before looking for them in .git/config. Thus settings found in
.git/config will override those from .gitmodules, thereby allowing the
user to ignore settings given by the remote side while also letting
upstream set reasonable defaults for those users who don't have special
needs.

This configuration can be overridden by the command line option
"--[no-]recurse-submodules" of "git fetch" and "git pull".

Signed-off-by: Jens Lehmann <Jens.Lehmann@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/config.txt

@@ -1768,6 +1768,13 @@ submodule.<name>.update::
 	URL and other values found in the `.gitmodules` file.  See
 	linkgit:git-submodule[1] and linkgit:gitmodules[5] for details.
 
+submodule.<name>.fetchRecurseSubmodules::
+	This option can be used to enable/disable recursive fetching of this
+	submodule. It can be overriden by using the --[no-]recurse-submodules
+	command line option to "git fetch" and "git pull".
+	This setting will override that from in the linkgit:gitmodules[5]
+	file.
+
 submodule.<name>.ignore::
 	Defines under what circumstances "git status" and the diff family show
 	a submodule as modified. When set to "all", it will never be considered

Documentation/fetch-options.txt

@@ -62,7 +62,7 @@ endif::git-pull[]
 
 --[no-]recurse-submodules::
 	This option controls if new commits of all populated submodules should
-	be fetched too (see linkgit:git-config[1]).
+	be fetched too (see linkgit:git-config[1] and linkgit:gitmodules[5]).
 
 ifndef::git-pull[]
 --submodule-prefix=<path>::

Documentation/gitmodules.txt

@@ -44,6 +44,14 @@ submodule.<name>.update::
 	This config option is overridden if 'git submodule update' is given
 	the '--merge' or '--rebase' options.
 
+submodule.<name>.fetchRecurseSubmodules::
+	This option can be used to enable/disable recursive fetching of this
+	submodule. If this option is also present in the submodules entry in
+	.git/config of the superproject, the setting there will override the
+	one found in .gitmodules.
+	Both settings can be overriden on the command line by using the
+	"--[no-]recurse-submodules" option to "git fetch" and "git pull"..
+
 submodule.<name>.ignore::
 	Defines under what circumstances "git status" and the diff family show
 	a submodule as modified. When set to "all", it will never be considered

submodule.c

@@ -10,6 +10,7 @@
 #include "string-list.h"
 
 struct string_list config_name_for_path;
+struct string_list config_fetch_recurse_submodules_for_name;
 struct string_list config_ignore_for_name;
 static int config_fetch_recurse_submodules;
 
@@ -105,6 +106,14 @@ int parse_submodule_config_option(const char *var, const char *value)
 			config = string_list_append(&config_name_for_path, xstrdup(value));
 		config->util = strbuf_detach(&submodname, NULL);
 		strbuf_release(&submodname);
+	} else if ((len > 23) && !strcmp(var + len - 23, ".fetchrecursesubmodules")) {
+		strbuf_add(&submodname, var, len - 23);
+		config = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, submodname.buf);
+		if (!config)
+			config = string_list_append(&config_fetch_recurse_submodules_for_name,
+						    strbuf_detach(&submodname, NULL));
+		config->util = git_config_bool(var, value) ? (void *)1 : NULL;
+		strbuf_release(&submodname);
 	} else if ((len > 7) && !strcmp(var + len - 7, ".ignore")) {
 		if (strcmp(value, "untracked") && strcmp(value, "dirty") &&
 		    strcmp(value, "all") && strcmp(value, "none")) {
@@ -283,8 +292,15 @@ int fetch_populated_submodules(int num_options, const char **options,
 			name = name_for_path->util;
 
 		if (!ignore_config) {
-			if (!config_fetch_recurse_submodules)
-				continue;
+			struct string_list_item *fetch_recurse_submodules_option;
+			fetch_recurse_submodules_option = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, name);
+			if (fetch_recurse_submodules_option) {
+				if (!fetch_recurse_submodules_option->util)
+					continue;
+			} else {
+				if (!config_fetch_recurse_submodules)
+					continue;
+			}
 		}
 
 		strbuf_addf(&submodule_path, "%s/%s", work_tree, ce->name);

t/t5526-fetch-submodules.sh

@@ -81,6 +81,56 @@ test_expect_success "fetch alone only fetches superproject" '
 	! test -s actual.err
 '
 
+test_expect_success "fetch --no-recurse-submodules only fetches superproject" '
+	(
+		cd downstream &&
+		git fetch --no-recurse-submodules >../actual.out 2>../actual.err
+	) &&
+	! test -s actual.out &&
+	! test -s actual.err
+'
+
+test_expect_success "using fetchRecurseSubmodules=true in .gitmodules recurses into submodules" '
+	(
+		cd downstream &&
+		git config -f .gitmodules submodule.submodule.fetchRecurseSubmodules true &&
+		git fetch >../actual.out 2>../actual.err
+	) &&
+	test_cmp expect.out actual.out &&
+	test_cmp expect.err actual.err
+'
+
+test_expect_success "--no-recurse-submodules overrides .gitmodules config" '
+	add_upstream_commit &&
+	(
+		cd downstream &&
+		git fetch --no-recurse-submodules >../actual.out 2>../actual.err
+	) &&
+	! test -s actual.out &&
+	! test -s actual.err
+'
+
+test_expect_success "using fetchRecurseSubmodules=false in .git/config overrides setting in .gitmodules" '
+	(
+		cd downstream &&
+		git config submodule.submodule.fetchRecurseSubmodules false &&
+		git fetch >../actual.out 2>../actual.err
+	) &&
+	! test -s actual.out &&
+	! test -s actual.err
+'
+
+test_expect_success "--recurse-submodules overrides fetchRecurseSubmodules setting from .git/config" '
+	(
+		cd downstream &&
+		git fetch --recurse-submodules >../actual.out 2>../actual.err &&
+		git config -f --unset .gitmodules submodule.submodule.fetchRecurseSubmodules true &&
+		git config --unset submodule.submodule.fetchRecurseSubmodules
+	) &&
+	test_cmp expect.out actual.out &&
+	test_cmp expect.err actual.err
+'
+
 test_expect_success "--quiet propagates to submodules" '
 	(
 		cd downstream &&