Add a new 'config' subcommand to 'submodule--helper', this extra level
of indirection makes it possible to add some flexibility to how the
submodules configuration is handled.

Signed-off-by: Antonio Ospite <a...@ao2.it>
---
 builtin/submodule--helper.c | 39 +++++++++++++++++++++++++++++++++++++
 t/t7411-submodule-config.sh | 26 +++++++++++++++++++++++++
 2 files changed, 65 insertions(+)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 9e8f2acd5..b32110e3b 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -1825,6 +1825,44 @@ static int is_active(int argc, const char **argv, const 
char *prefix)
        return !is_submodule_active(the_repository, argv[1]);
 }
 
+static int config_print_callback(const char *key_, const char *value_, void 
*cb_data)
+{
+       char *key = cb_data;
+
+       if (!strcmp(key, key_))
+               printf("%s\n", value_);
+
+       return 0;
+}
+
+static int module_config(int argc, const char **argv, const char *prefix)
+{
+       int ret;
+
+       if (argc < 2 || argc > 3)
+               die("submodule--helper config takes 1 or 2 arguments: name 
[value]");
+
+       /* Equivalent to ACTION_GET in builtin/config.c */
+       if (argc == 2) {
+               char *key;
+
+               ret = git_config_parse_key(argv[1], &key, NULL);
+               if (ret < 0)
+                       return CONFIG_INVALID_KEY;
+
+               config_from_gitmodules(config_print_callback, the_repository, 
key);
+
+               free(key);
+               return 0;
+       }
+
+       /* Equivalent to ACTION_SET in builtin/config.c */
+       if (argc == 3)
+               return config_gitmodules_set(argv[1], argv[2]);
+
+       return 0;
+}
+
 #define SUPPORT_SUPER_PREFIX (1<<0)
 
 struct cmd_struct {
@@ -1850,6 +1888,7 @@ static struct cmd_struct commands[] = {
        {"push-check", push_check, 0},
        {"absorb-git-dirs", absorb_git_dirs, SUPPORT_SUPER_PREFIX},
        {"is-active", is_active, 0},
+       {"config", module_config, 0},
 };
 
 int cmd_submodule__helper(int argc, const char **argv, const char *prefix)
diff --git a/t/t7411-submodule-config.sh b/t/t7411-submodule-config.sh
index a648de6a9..dfe019f05 100755
--- a/t/t7411-submodule-config.sh
+++ b/t/t7411-submodule-config.sh
@@ -139,4 +139,30 @@ test_expect_success 'error in history in 
fetchrecursesubmodule lets continue' '
        )
 '
 
+test_expect_success 'reading submodules config with "submodule--helper 
config"' '
+       (cd super &&
+               echo "../submodule" >expected &&
+               git submodule--helper config submodule.submodule.url >actual &&
+               test_cmp expected actual
+       )
+'
+
+test_expect_success 'writing submodules config with "submodule--helper 
config"' '
+       (cd super &&
+               echo "new_url" >expected &&
+               git submodule--helper config submodule.submodule.url "new_url" 
&&
+               git submodule--helper config submodule.submodule.url >actual &&
+               test_cmp expected actual
+       )
+'
+
+test_expect_success 'overwriting unstaged submodules config with 
"submodule--helper config"' '
+       (cd super &&
+               echo "newer_url" >expected &&
+               git submodule--helper config submodule.submodule.url 
"newer_url" &&
+               git submodule--helper config submodule.submodule.url >actual &&
+               test_cmp expected actual
+       )
+'
+
 test_done
-- 
2.17.0

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