Any command that understands '--recurse-submodules' can have its
default changed to true, by setting the submodule.recurse
option.

This patch includes read-tree/checkout/reset for working tree
manipulating commands. Later patches will cover other commands.

Signed-off-by: Stefan Beller <sbel...@google.com>
---
 Documentation/config.txt  |  5 +++++
 builtin/checkout.c        |  9 +++------
 submodule.c               |  6 +++++-
 t/lib-submodule-update.sh | 12 ++++++++++++
 4 files changed, 25 insertions(+), 7 deletions(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 475e874d51..e367becf72 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -3063,6 +3063,11 @@ submodule.active::
        submodule's path to determine if the submodule is of interest to git
        commands.
 
+submodule.recurse::
+       Specifies if commands recurse into submodules by default. This
+       applies to all commands that have a `--recurse-submodules` option.
+       Defaults to false.
+
 submodule.fetchJobs::
        Specifies how many submodules are fetched/cloned at the same time.
        A positive integer allows up to that number of submodules fetched
diff --git a/builtin/checkout.c b/builtin/checkout.c
index 2787b343b1..ad44ee843a 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -1194,7 +1194,7 @@ int cmd_checkout(int argc, const char **argv, const char 
*prefix)
        opts.prefix = prefix;
        opts.show_progress = -1;
 
-       gitmodules_config();
+       load_submodule_config();
        git_config(git_checkout_config, &opts);
 
        opts.track = BRANCH_TRACK_UNSPECIFIED;
@@ -1214,11 +1214,8 @@ int cmd_checkout(int argc, const char **argv, const char 
*prefix)
                git_xmerge_config("merge.conflictstyle", conflict_style, NULL);
        }
 
-       if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
-               load_submodule_config();
-               if (recurse_submodules != RECURSE_SUBMODULES_DEFAULT)
-                       
set_config_update_recurse_submodules(recurse_submodules);
-       }
+       if (recurse_submodules != RECURSE_SUBMODULES_DEFAULT)
+               set_config_update_recurse_submodules(recurse_submodules);
 
        if ((!!opts.new_branch + !!opts.new_branch_force + 
!!opts.new_orphan_branch) > 1)
                die(_("-b, -B and --orphan are mutually exclusive"));
diff --git a/submodule.c b/submodule.c
index dda5ed210f..5d7aa711c8 100644
--- a/submodule.c
+++ b/submodule.c
@@ -91,7 +91,11 @@ int update_path_in_gitmodules(const char *oldpath, const 
char *newpath)
 
 static int submodule_config(const char *var, const char *value, void *cb)
 {
-       if (!strcmp(var, "submodule.fetchjobs")) {
+       if (!strcmp(var, "submodule.recurse")) {
+               int v = git_config_bool(var, value) ?
+                       RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
+               config_update_recurse_submodules = v;
+       } else if (!strcmp(var, "submodule.fetchjobs")) {
                submodule_config_reading = SUBMODULE_CONFIG_EXISTS;
                parallel_jobs = git_config_int(var, value);
                if (parallel_jobs < 0)
diff --git a/t/lib-submodule-update.sh b/t/lib-submodule-update.sh
index 0f70b5ec7b..b30164339e 100755
--- a/t/lib-submodule-update.sh
+++ b/t/lib-submodule-update.sh
@@ -990,6 +990,18 @@ test_submodule_switch_recursing () {
                )
        '
 
+       test_expect_success "git -c submodule.recurse=true $cmd_args 
--recurse-submodules: modified submodule updates submodule work tree" '
+               prolog &&
+               reset_work_tree_to_interested add_sub1 &&
+               (
+                       cd submodule_update &&
+                       git branch -t modify_sub1 origin/modify_sub1 &&
+                       git -c submodule.recurse=true $cmd_args 
--recurse-submodules modify_sub1 &&
+                       test_superproject_content origin/modify_sub1 &&
+                       test_submodule_content sub1 origin/modify_sub1
+               )
+       '
+
        # Updating a submodule to an invalid sha1 doesn't update the
        # superproject nor the submodule's work tree.
        test_expect_success "$command: updating to a missing submodule commit 
fails" '
-- 
2.13.0.18.g7d86cc8ba0

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