[PATCH 0/7] Resend of sb/submodule-update-in-c

[PATCH 0/7] Resend of sb/submodule-update-in-c

[Stefan Beller]

* Introduce new patch
  "submodule--helper: replace connect-gitdir-workingtree by ensure-core-worktree"
  that resolves the conflict with earlier versions of this series with
  sb/submodule-core-worktree
* This series is based on master, which already contains 
  sb/submodule-core-worktree
  
Thanks,
Stefan

Stefan Beller (7):
  git-submodule.sh: align error reporting for update mode to use path
  git-submodule.sh: rename unused variables
  builtin/submodule--helper: factor out submodule updating
  builtin/submodule--helper: store update_clone information in a struct
  builtin/submodule--helper: factor out method to update a single
    submodule
  submodule--helper: replace connect-gitdir-workingtree by
    ensure-core-worktree
  submodule--helper: introduce new update-module-mode helper

 builtin/submodule--helper.c | 216 ++++++++++++++++++++++++++----------
 git-submodule.sh            |  29 +----
 2 files changed, 164 insertions(+), 81 deletions(-)

  ./git-range-diff origin/sb/submodule-update-in-c...HEAD
      [...]
  -:  ----------- > 338:  1d89318c48d Fifth batch for 2.19 cycle
  1:  c1cb423b249 = 339:  3090cbcb46e git-submodule.sh: align error reporting for update mode to use path
  2:  f188b30a9b9 = 340:  850a16e9085 git-submodule.sh: rename unused variables
  3:  70d84fa6a09 ! 341:  88af0cdcba6 builtin/submodule--helper: factor out submodule updating
    @@ -73,10 +73,10 @@
      	};
      	suc.prefix = prefix;
      
    --	config_from_gitmodules(gitmodules_update_clone_config, &max_jobs);
    --	git_config(gitmodules_update_clone_config, &max_jobs);
    -+	config_from_gitmodules(gitmodules_update_clone_config, &suc.max_jobs);
    -+	git_config(gitmodules_update_clone_config, &suc.max_jobs);
    +-	update_clone_config_from_gitmodules(&max_jobs);
    +-	git_config(git_update_clone_config, &max_jobs);
    ++	update_clone_config_from_gitmodules(&suc.max_jobs);
    ++	git_config(git_update_clone_config, &suc.max_jobs);
      
      	argc = parse_options(argc, argv, prefix, module_update_clone_options,
      			     git_submodule_helper_usage, 0);
  4:  511e8a139c9 = 342:  2fdd479a6d5 builtin/submodule--helper: store update_clone information in a struct
  5:  65b2a720b90 = 343:  34589e724b3 builtin/submodule--helper: factor out method to update a single submodule
  -:  ----------- > 344:  ee2bb4f23d8 submodule--helper: replace connect-gitdir-workingtree by ensure-core-worktree
  6:  e5803d07f9b ! 345:  03300626ba7 submodule--helper: introduce new update-module-mode helper
    @@ -88,15 +88,15 @@
      	{"clone", module_clone, 0},
     +	{"update-module-mode", module_update_module_mode, 0},
      	{"update-clone", update_clone, 0},
    + 	{"ensure-core-worktree", ensure_core_worktree, 0},
      	{"relative-path", resolve_relative_path, 0},
    - 	{"resolve-relative-url", resolve_relative_url, 0},
     
     diff --git a/git-submodule.sh b/git-submodule.sh
     --- a/git-submodule.sh
     +++ b/git-submodule.sh
     @@
    - 	do
    - 		die_if_unmatched "$quickabort" "$sha1"
    + 
    + 		git submodule--helper ensure-core-worktree "$sm_path"
      
     -		name=$(git submodule--helper name "$sm_path") || exit
     -		if ! test -z "$update"

[PATCH 1/7] git-submodule.sh: align error reporting for update mode to use path

[Stefan Beller]

All other error messages in cmd_update are reporting the submodule based
on its path, so let's do that for invalid update modes, too.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 git-submodule.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/git-submodule.sh b/git-submodule.sh
index 8b5ad59bdee..5a58812645d 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -632,7 +632,7 @@ cmd_update()
 				must_die_on_failure=yes
 				;;
 			*)
-				die "$(eval_gettext "Invalid update mode '$update_module' for submodule '$name'")"
+				die "$(eval_gettext "Invalid update mode '$update_module' for submodule path '$path'")"
 			esac
 
 			if (sanitize_submodule_env; cd "$sm_path" && $command "$sha1")
-- 
2.18.0.132.g195c49a2227

[PATCH 2/7] git-submodule.sh: rename unused variables

[Stefan Beller]

The 'mode' variable is not used in cmd_update for its original purpose,
rename it to 'dummy' as it only serves the purpose to abort quickly
documenting this knowledge.

The variable 'stage' is also not used any more in cmd_update, so remove it.

This went unnoticed as first each function used the commonly used
submodule listing, which was converted in 74703a1e4df (submodule: rewrite
`module_list` shell function in C, 2015-09-02). When cmd_update was
using its own function starting in 48308681b07 (git submodule update:
have a dedicated helper for cloning, 2016-02-29), its removal was missed.

A later patch in this series also touches the communication between
the submodule helper and git-submodule.sh, but let's have this as
a preparatory patch, as it eases the next patch, which stores the
raw data instead of the line printed for this communication.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/submodule--helper.c | 5 ++---
 git-submodule.sh            | 4 ++--
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index a3c4564c6c8..da700c88963 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -1573,9 +1573,8 @@ static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
 	needs_cloning = !file_exists(sb.buf);
 
 	strbuf_reset(&sb);
-	strbuf_addf(&sb, "%06o %s %d %d\t%s\n", ce->ce_mode,
-			oid_to_hex(&ce->oid), ce_stage(ce),
-			needs_cloning, ce->name);
+	strbuf_addf(&sb, "dummy %s %d\t%s\n",
+		    oid_to_hex(&ce->oid), needs_cloning, ce->name);
 	string_list_append(&suc->projectlines, sb.buf);
 
 	if (!needs_cloning)
diff --git a/git-submodule.sh b/git-submodule.sh
index 5a58812645d..8caaf274e25 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -531,9 +531,9 @@ cmd_update()
 		"$@" || echo "#unmatched" $?
 	} | {
 	err=
-	while read -r mode sha1 stage just_cloned sm_path
+	while read -r quickabort sha1 just_cloned sm_path
 	do
-		die_if_unmatched "$mode" "$sha1"
+		die_if_unmatched "$quickabort" "$sha1"
 
 		name=$(git submodule--helper name "$sm_path") || exit
 		if ! test -z "$update"
-- 
2.18.0.132.g195c49a2227

[PATCH 3/7] builtin/submodule--helper: factor out submodule updating

[Stefan Beller]

Separate the command line parsing from the actual execution of the command
within the repository. For now there is not a lot of execution as
most of it is still in git-submodule.sh.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/submodule--helper.c | 59 +++++++++++++++++++++----------------
 1 file changed, 33 insertions(+), 26 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index da700c88963..32f00ca6f87 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -1474,6 +1474,8 @@ struct submodule_update_clone {
 	/* failed clones to be retried again */
 	const struct cache_entry **failed_clones;
 	int failed_clones_nr, failed_clones_alloc;
+
+	int max_jobs;
 };
 #define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
 	SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, 0, \
@@ -1716,11 +1718,36 @@ static int git_update_clone_config(const char *var, const char *value,
 	return 0;
 }
 
+static int update_submodules(struct submodule_update_clone *suc)
+{
+	struct string_list_item *item;
+
+	run_processes_parallel(suc->max_jobs,
+			       update_clone_get_next_task,
+			       update_clone_start_failure,
+			       update_clone_task_finished,
+			       suc);
+
+	/*
+	 * We saved the output and put it out all at once now.
+	 * That means:
+	 * - the listener does not have to interleave their (checkout)
+	 *   work with our fetching.  The writes involved in a
+	 *   checkout involve more straightforward sequential I/O.
+	 * - the listener can avoid doing any work if fetching failed.
+	 */
+	if (suc->quickstop)
+		return 1;
+
+	for_each_string_list_item(item, &suc->projectlines)
+		fprintf(stdout, "%s", item->string);
+
+	return 0;
+}
+
 static int update_clone(int argc, const char **argv, const char *prefix)
 {
 	const char *update = NULL;
-	int max_jobs = 1;
-	struct string_list_item *item;
 	struct pathspec pathspec;
 	struct submodule_update_clone suc = SUBMODULE_UPDATE_CLONE_INIT;
 
@@ -1742,7 +1769,7 @@ static int update_clone(int argc, const char **argv, const char *prefix)
 		OPT_STRING(0, "depth", &suc.depth, "<depth>",
 			   N_("Create a shallow clone truncated to the "
 			      "specified number of revisions")),
-		OPT_INTEGER('j', "jobs", &max_jobs,
+		OPT_INTEGER('j', "jobs", &suc.max_jobs,
 			    N_("parallel jobs")),
 		OPT_BOOL(0, "recommend-shallow", &suc.recommend_shallow,
 			    N_("whether the initial clone should follow the shallow recommendation")),
@@ -1758,8 +1785,8 @@ static int update_clone(int argc, const char **argv, const char *prefix)
 	};
 	suc.prefix = prefix;
 
-	update_clone_config_from_gitmodules(&max_jobs);
-	git_config(git_update_clone_config, &max_jobs);
+	update_clone_config_from_gitmodules(&suc.max_jobs);
+	git_config(git_update_clone_config, &suc.max_jobs);
 
 	argc = parse_options(argc, argv, prefix, module_update_clone_options,
 			     git_submodule_helper_usage, 0);
@@ -1774,27 +1801,7 @@ static int update_clone(int argc, const char **argv, const char *prefix)
 	if (pathspec.nr)
 		suc.warn_if_uninitialized = 1;
 
-	run_processes_parallel(max_jobs,
-			       update_clone_get_next_task,
-			       update_clone_start_failure,
-			       update_clone_task_finished,
-			       &suc);
-
-	/*
-	 * We saved the output and put it out all at once now.
-	 * That means:
-	 * - the listener does not have to interleave their (checkout)
-	 *   work with our fetching.  The writes involved in a
-	 *   checkout involve more straightforward sequential I/O.
-	 * - the listener can avoid doing any work if fetching failed.
-	 */
-	if (suc.quickstop)
-		return 1;
-
-	for_each_string_list_item(item, &suc.projectlines)
-		fprintf(stdout, "%s", item->string);
-
-	return 0;
+	return update_submodules(&suc);
 }
 
 static int resolve_relative_path(int argc, const char **argv, const char *prefix)
-- 
2.18.0.132.g195c49a2227

[PATCH 4/7] builtin/submodule--helper: store update_clone information in a struct

[Stefan Beller]

The information that is printed for update_submodules in
'submodule--helper update-clone' and consumed by 'git submodule update'
is stored as a string per submodule. This made sense at the time of
48308681b07 (git submodule update: have a dedicated helper for cloning,
2016-02-29), but as we want to migrate the rest of the submodule update
into C, we're better off having access to the raw information in a helper
struct.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/submodule--helper.c | 37 +++++++++++++++++++++++++++----------
 1 file changed, 27 insertions(+), 10 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 32f00ca6f87..40b94dd622e 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -1446,6 +1446,12 @@ static int module_clone(int argc, const char **argv, const char *prefix)
 	return 0;
 }
 
+struct update_clone_data {
+	const struct submodule *sub;
+	struct object_id oid;
+	unsigned just_cloned;
+};
+
 struct submodule_update_clone {
 	/* index into 'list', the list of submodules to look into for cloning */
 	int current;
@@ -1465,8 +1471,9 @@ struct submodule_update_clone {
 	const char *recursive_prefix;
 	const char *prefix;
 
-	/* Machine-readable status lines to be consumed by git-submodule.sh */
-	struct string_list projectlines;
+	/* to be consumed by git-submodule.sh */
+	struct update_clone_data *update_clone;
+	int update_clone_nr; int update_clone_alloc;
 
 	/* If we want to stop as fast as possible and return an error */
 	unsigned quickstop : 1;
@@ -1480,7 +1487,7 @@ struct submodule_update_clone {
 #define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
 	SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, 0, \
 	NULL, NULL, NULL, \
-	STRING_LIST_INIT_DUP, 0, NULL, 0, 0}
+	NULL, 0, 0, 0, NULL, 0, 0, 0}
 
 
 static void next_submodule_warn_missing(struct submodule_update_clone *suc,
@@ -1574,10 +1581,12 @@ static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
 	strbuf_addf(&sb, "%s/.git", ce->name);
 	needs_cloning = !file_exists(sb.buf);
 
-	strbuf_reset(&sb);
-	strbuf_addf(&sb, "dummy %s %d\t%s\n",
-		    oid_to_hex(&ce->oid), needs_cloning, ce->name);
-	string_list_append(&suc->projectlines, sb.buf);
+	ALLOC_GROW(suc->update_clone, suc->update_clone_nr + 1,
+		   suc->update_clone_alloc);
+	oidcpy(&suc->update_clone[suc->update_clone_nr].oid, &ce->oid);
+	suc->update_clone[suc->update_clone_nr].just_cloned = needs_cloning;
+	suc->update_clone[suc->update_clone_nr].sub = sub;
+	suc->update_clone_nr++;
 
 	if (!needs_cloning)
 		goto cleanup;
@@ -1720,7 +1729,8 @@ static int git_update_clone_config(const char *var, const char *value,
 
 static int update_submodules(struct submodule_update_clone *suc)
 {
-	struct string_list_item *item;
+	int i;
+	struct strbuf sb = STRBUF_INIT;
 
 	run_processes_parallel(suc->max_jobs,
 			       update_clone_get_next_task,
@@ -1739,9 +1749,16 @@ static int update_submodules(struct submodule_update_clone *suc)
 	if (suc->quickstop)
 		return 1;
 
-	for_each_string_list_item(item, &suc->projectlines)
-		fprintf(stdout, "%s", item->string);
+	for (i = 0; i < suc->update_clone_nr; i++) {
+		strbuf_addf(&sb, "dummy %s %d\t%s\n",
+			oid_to_hex(&suc->update_clone[i].oid),
+			suc->update_clone[i].just_cloned,
+			suc->update_clone[i].sub->path);
+		fprintf(stdout, "%s", sb.buf);
+		strbuf_reset(&sb);
+	}
 
+	strbuf_release(&sb);
 	return 0;
 }
 
-- 
2.18.0.132.g195c49a2227

[PATCH 5/7] builtin/submodule--helper: factor out method to update a single submodule

[Stefan Beller]

In a later patch we'll find this method handy.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/submodule--helper.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 40b94dd622e..8b1088ab58a 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -1727,10 +1727,17 @@ static int git_update_clone_config(const char *var, const char *value,
 	return 0;
 }
 
+static void update_submodule(struct update_clone_data *ucd)
+{
+	fprintf(stdout, "dummy %s %d\t%s\n",
+		oid_to_hex(&ucd->oid),
+		ucd->just_cloned,
+		ucd->sub->path);
+}
+
 static int update_submodules(struct submodule_update_clone *suc)
 {
 	int i;
-	struct strbuf sb = STRBUF_INIT;
 
 	run_processes_parallel(suc->max_jobs,
 			       update_clone_get_next_task,
@@ -1749,16 +1756,9 @@ static int update_submodules(struct submodule_update_clone *suc)
 	if (suc->quickstop)
 		return 1;
 
-	for (i = 0; i < suc->update_clone_nr; i++) {
-		strbuf_addf(&sb, "dummy %s %d\t%s\n",
-			oid_to_hex(&suc->update_clone[i].oid),
-			suc->update_clone[i].just_cloned,
-			suc->update_clone[i].sub->path);
-		fprintf(stdout, "%s", sb.buf);
-		strbuf_reset(&sb);
-	}
+	for (i = 0; i < suc->update_clone_nr; i++)
+		update_submodule(&suc->update_clone[i]);
 
-	strbuf_release(&sb);
 	return 0;
 }
 
-- 
2.18.0.132.g195c49a2227

[PATCH 6/7] submodule--helper: replace connect-gitdir-workingtree by ensure-core-worktree

[Stefan Beller]

e98317508c0 (submodule: ensure core.worktree is set after update,
2018-06-18) was overly aggressive in calling connect_work_tree_and_git_dir
as that ensures both the 'core.worktree' configuration is set as well as
setting up correct gitlink file pointing at the git directory.

We do not need to check for the gitlink in this part of the cmd_update
in git-submodule.sh, as the initial call to update-clone will have ensured
that. So we can reduce the work to only (check and potentially) set the
'core.worktree' setting.

While at it move the check from shell to C as that proves to be useful in
a follow up patch, as we do not need the 'name' in shell now.

Signed-off-by: Stefan Beller <sbeller@google.com>
---
 builtin/submodule--helper.c | 64 +++++++++++++++++++++++--------------
 git-submodule.sh            |  7 ++--
 2 files changed, 42 insertions(+), 29 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 8b1088ab58a..e7635d5d9ab 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -1964,6 +1964,45 @@ static int push_check(int argc, const char **argv, const char *prefix)
 	return 0;
 }
 
+static int ensure_core_worktree(int argc, const char **argv, const char *prefix)
+{
+	const struct submodule *sub;
+	const char *path;
+	char *cw;
+	struct repository subrepo;
+
+	if (argc != 2)
+		BUG("submodule--helper connect-gitdir-workingtree <name> <path>");
+
+	path = argv[1];
+
+	sub = submodule_from_path(the_repository, &null_oid, path);
+	if (!sub)
+		BUG("We could get the submodule handle before?");
+
+	if (repo_submodule_init(&subrepo, the_repository, path))
+		die(_("could not get a repository handle for submodule '%s'"), path);
+
+	if (!repo_config_get_string(&subrepo, "core.worktree", &cw)) {
+		char *cfg_file, *abs_path;
+		const char *rel_path;
+		struct strbuf sb = STRBUF_INIT;
+
+		cfg_file = xstrfmt("%s/config", subrepo.gitdir);
+
+		abs_path = absolute_pathdup(path);
+		rel_path = relative_path(abs_path, subrepo.gitdir, &sb);
+
+		git_config_set_in_file(cfg_file, "core.worktree", rel_path);
+
+		free(cfg_file);
+		free(abs_path);
+		strbuf_release(&sb);
+	}
+
+	return 0;
+}
+
 static int absorb_git_dirs(int argc, const char **argv, const char *prefix)
 {
 	int i;
@@ -2029,29 +2068,6 @@ static int check_name(int argc, const char **argv, const char *prefix)
 	return 0;
 }
 
-static int connect_gitdir_workingtree(int argc, const char **argv, const char *prefix)
-{
-	struct strbuf sb = STRBUF_INIT;
-	const char *name, *path;
-	char *sm_gitdir;
-
-	if (argc != 3)
-		BUG("submodule--helper connect-gitdir-workingtree <name> <path>");
-
-	name = argv[1];
-	path = argv[2];
-
-	strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
-	sm_gitdir = absolute_pathdup(sb.buf);
-
-	connect_work_tree_and_git_dir(path, sm_gitdir, 0);
-
-	strbuf_release(&sb);
-	free(sm_gitdir);
-
-	return 0;
-}
-
 #define SUPPORT_SUPER_PREFIX (1<<0)
 
 struct cmd_struct {
@@ -2065,7 +2081,7 @@ static struct cmd_struct commands[] = {
 	{"name", module_name, 0},
 	{"clone", module_clone, 0},
 	{"update-clone", update_clone, 0},
-	{"connect-gitdir-workingtree", connect_gitdir_workingtree, 0},
+	{"ensure-core-worktree", ensure_core_worktree, 0},
 	{"relative-path", resolve_relative_path, 0},
 	{"resolve-relative-url", resolve_relative_url, 0},
 	{"resolve-relative-url-test", resolve_relative_url_test, 0},
diff --git a/git-submodule.sh b/git-submodule.sh
index 8caaf274e25..19d010eac06 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -535,6 +535,8 @@ cmd_update()
 	do
 		die_if_unmatched "$quickabort" "$sha1"
 
+		git submodule--helper ensure-core-worktree "$sm_path"
+
 		name=$(git submodule--helper name "$sm_path") || exit
 		if ! test -z "$update"
 		then
@@ -577,11 +579,6 @@ cmd_update()
 			die "$(eval_gettext "Unable to find current \${remote_name}/\${branch} revision in submodule path '\$sm_path'")"
 		fi
 
-		if ! $(git config -f "$(git rev-parse --git-common-dir)/modules/$name/config" core.worktree) 2>/dev/null
-		then
-			git submodule--helper connect-gitdir-workingtree "$name" "$sm_path"
-		fi
-
 		if test "$subsha1" != "$sha1" || test -n "$force"
 		then
 			subforce=$force
-- 
2.18.0.132.g195c49a2227

[PATCH 7/7] submodule--helper: introduce new update-module-mode helper

[Stefan Beller]

This chews off a bit of the shell part of the update command in
git-submodule.sh. When writing the C code, keep in mind that the
submodule--helper part will go away eventually and we want to have
a C function that is able to determine the submodule update strategy,
it as a nicety, make determine_submodule_update_strategy accessible
for arbitrary repositories.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/submodule--helper.c | 61 +++++++++++++++++++++++++++++++++++++
 git-submodule.sh            | 16 +---------
 2 files changed, 62 insertions(+), 15 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index e7635d5d9ab..e72157664f5 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -1446,6 +1446,66 @@ static int module_clone(int argc, const char **argv, const char *prefix)
 	return 0;
 }
 
+static void determine_submodule_update_strategy(struct repository *r,
+						int just_cloned,
+						const char *path,
+						const char *update,
+						struct submodule_update_strategy *out)
+{
+	const struct submodule *sub = submodule_from_path(r, &null_oid, path);
+	char *key;
+	const char *val;
+
+	key = xstrfmt("submodule.%s.update", sub->name);
+
+	if (update) {
+		trace_printf("parsing update");
+		if (parse_submodule_update_strategy(update, out) < 0)
+			die(_("Invalid update mode '%s' for submodule path '%s'"),
+				update, path);
+	} else if (!repo_config_get_string_const(r, key, &val)) {
+		if (parse_submodule_update_strategy(val, out) < 0)
+			die(_("Invalid update mode '%s' configured for submodule path '%s'"),
+				val, path);
+	} else if (sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
+		trace_printf("loaded thing");
+		out->type = sub->update_strategy.type;
+		out->command = sub->update_strategy.command;
+	} else
+		out->type = SM_UPDATE_CHECKOUT;
+
+	if (just_cloned &&
+	    (out->type == SM_UPDATE_MERGE ||
+	     out->type == SM_UPDATE_REBASE ||
+	     out->type == SM_UPDATE_NONE))
+		out->type = SM_UPDATE_CHECKOUT;
+
+	free(key);
+}
+
+static int module_update_module_mode(int argc, const char **argv, const char *prefix)
+{
+	const char *path, *update = NULL;
+	int just_cloned;
+	struct submodule_update_strategy update_strategy = { .type = SM_UPDATE_CHECKOUT };
+
+	if (argc < 3 || argc > 4)
+		die("submodule--helper update-module-clone expects <just-cloned> <path> [<update>]");
+
+	just_cloned = git_config_int("just_cloned", argv[1]);
+	path = argv[2];
+
+	if (argc == 4)
+		update = argv[3];
+
+	determine_submodule_update_strategy(the_repository,
+					    just_cloned, path, update,
+					    &update_strategy);
+	fputs(submodule_strategy_to_string(&update_strategy), stdout);
+
+	return 0;
+}
+
 struct update_clone_data {
 	const struct submodule *sub;
 	struct object_id oid;
@@ -2080,6 +2140,7 @@ static struct cmd_struct commands[] = {
 	{"list", module_list, 0},
 	{"name", module_name, 0},
 	{"clone", module_clone, 0},
+	{"update-module-mode", module_update_module_mode, 0},
 	{"update-clone", update_clone, 0},
 	{"ensure-core-worktree", ensure_core_worktree, 0},
 	{"relative-path", resolve_relative_path, 0},
diff --git a/git-submodule.sh b/git-submodule.sh
index 19d010eac06..19c9f1215e1 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -537,27 +537,13 @@ cmd_update()
 
 		git submodule--helper ensure-core-worktree "$sm_path"
 
-		name=$(git submodule--helper name "$sm_path") || exit
-		if ! test -z "$update"
-		then
-			update_module=$update
-		else
-			update_module=$(git config submodule."$name".update)
-			if test -z "$update_module"
-			then
-				update_module="checkout"
-			fi
-		fi
+		update_module=$(git submodule--helper update-module-mode $just_cloned "$sm_path" $update)
 
 		displaypath=$(git submodule--helper relative-path "$prefix$sm_path" "$wt_prefix")
 
 		if test $just_cloned -eq 1
 		then
 			subsha1=
-			case "$update_module" in
-			merge | rebase | none)
-				update_module=checkout ;;
-			esac
 		else
 			subsha1=$(sanitize_submodule_env; cd "$sm_path" &&
 				git rev-parse --verify HEAD) ||
-- 
2.18.0.132.g195c49a2227

Re: [PATCH 0/7] Resend of sb/submodule-update-in-c

[Junio C Hamano]

Stefan Beller <sbeller@google.com> writes:

> * Introduce new patch
>   "submodule--helper: replace connect-gitdir-workingtree by ensure-core-worktree"
>   that resolves the conflict with earlier versions of this series with
>   sb/submodule-core-worktree
> * This series is based on master, which already contains 
>   sb/submodule-core-worktree

Thanks; as this is not a bugfix but a new way of implementing the
thing, it is good to base it on 'master'.

Will queue.

Re: [PATCH 6/7] submodule--helper: replace connect-gitdir-workingtree by ensure-core-worktree

[Brandon Williams]

On 08/03, Stefan Beller wrote:
> e98317508c0 (submodule: ensure core.worktree is set after update,
> 2018-06-18) was overly aggressive in calling connect_work_tree_and_git_dir
> as that ensures both the 'core.worktree' configuration is set as well as
> setting up correct gitlink file pointing at the git directory.
> 
> We do not need to check for the gitlink in this part of the cmd_update
> in git-submodule.sh, as the initial call to update-clone will have ensured
> that. So we can reduce the work to only (check and potentially) set the
> 'core.worktree' setting.
> 
> While at it move the check from shell to C as that proves to be useful in
> a follow up patch, as we do not need the 'name' in shell now.
> 
> Signed-off-by: Stefan Beller <sbeller@google.com>
> ---
>  builtin/submodule--helper.c | 64 +++++++++++++++++++++++--------------
>  git-submodule.sh            |  7 ++--
>  2 files changed, 42 insertions(+), 29 deletions(-)
> 
> diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
> index 8b1088ab58a..e7635d5d9ab 100644
> --- a/builtin/submodule--helper.c
> +++ b/builtin/submodule--helper.c
> @@ -1964,6 +1964,45 @@ static int push_check(int argc, const char **argv, const char *prefix)
>  	return 0;
>  }
>  
> +static int ensure_core_worktree(int argc, const char **argv, const char *prefix)
> +{
> +	const struct submodule *sub;
> +	const char *path;
> +	char *cw;
> +	struct repository subrepo;
> +
> +	if (argc != 2)
> +		BUG("submodule--helper connect-gitdir-workingtree <name> <path>");
> +
> +	path = argv[1];
> +
> +	sub = submodule_from_path(the_repository, &null_oid, path);
> +	if (!sub)
> +		BUG("We could get the submodule handle before?");
> +
> +	if (repo_submodule_init(&subrepo, the_repository, path))
> +		die(_("could not get a repository handle for submodule '%s'"), path);
> +
> +	if (!repo_config_get_string(&subrepo, "core.worktree", &cw)) {
> +		char *cfg_file, *abs_path;
> +		const char *rel_path;
> +		struct strbuf sb = STRBUF_INIT;
> +
> +		cfg_file = xstrfmt("%s/config", subrepo.gitdir);

As I mentioned here:
https://public-inbox.org/git/20180807230637.247200-1-bmwill@google.com/T/#t

This lines should probably be more like:

  cfg_file = repo_git_path(&subrepo, "config");

> +
> +		abs_path = absolute_pathdup(path);
> +		rel_path = relative_path(abs_path, subrepo.gitdir, &sb);
> +
> +		git_config_set_in_file(cfg_file, "core.worktree", rel_path);
> +
> +		free(cfg_file);
> +		free(abs_path);
> +		strbuf_release(&sb);
> +	}
> +
> +	return 0;
> +}
> +
>  static int absorb_git_dirs(int argc, const char **argv, const char *prefix)
>  {
>  	int i;
> @@ -2029,29 +2068,6 @@ static int check_name(int argc, const char **argv, const char *prefix)
>  	return 0;
>  }
>  
> -static int connect_gitdir_workingtree(int argc, const char **argv, const char *prefix)
> -{
> -	struct strbuf sb = STRBUF_INIT;
> -	const char *name, *path;
> -	char *sm_gitdir;
> -
> -	if (argc != 3)
> -		BUG("submodule--helper connect-gitdir-workingtree <name> <path>");
> -
> -	name = argv[1];
> -	path = argv[2];
> -
> -	strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
> -	sm_gitdir = absolute_pathdup(sb.buf);
> -
> -	connect_work_tree_and_git_dir(path, sm_gitdir, 0);
> -
> -	strbuf_release(&sb);
> -	free(sm_gitdir);
> -
> -	return 0;
> -}
> -
>  #define SUPPORT_SUPER_PREFIX (1<<0)
>  
>  struct cmd_struct {
> @@ -2065,7 +2081,7 @@ static struct cmd_struct commands[] = {
>  	{"name", module_name, 0},
>  	{"clone", module_clone, 0},
>  	{"update-clone", update_clone, 0},
> -	{"connect-gitdir-workingtree", connect_gitdir_workingtree, 0},
> +	{"ensure-core-worktree", ensure_core_worktree, 0},
>  	{"relative-path", resolve_relative_path, 0},
>  	{"resolve-relative-url", resolve_relative_url, 0},
>  	{"resolve-relative-url-test", resolve_relative_url_test, 0},
> diff --git a/git-submodule.sh b/git-submodule.sh
> index 8caaf274e25..19d010eac06 100755
> --- a/git-submodule.sh
> +++ b/git-submodule.sh
> @@ -535,6 +535,8 @@ cmd_update()
>  	do
>  		die_if_unmatched "$quickabort" "$sha1"
>  
> +		git submodule--helper ensure-core-worktree "$sm_path"
> +
>  		name=$(git submodule--helper name "$sm_path") || exit
>  		if ! test -z "$update"
>  		then
> @@ -577,11 +579,6 @@ cmd_update()
>  			die "$(eval_gettext "Unable to find current \${remote_name}/\${branch} revision in submodule path '\$sm_path'")"
>  		fi
>  
> -		if ! $(git config -f "$(git rev-parse --git-common-dir)/modules/$name/config" core.worktree) 2>/dev/null
> -		then
> -			git submodule--helper connect-gitdir-workingtree "$name" "$sm_path"
> -		fi
> -
>  		if test "$subsha1" != "$sha1" || test -n "$force"
>  		then
>  			subforce=$force
> -- 
> 2.18.0.132.g195c49a2227
> 

-- 
Brandon Williams

Re: [PATCH 6/7] submodule--helper: replace connect-gitdir-workingtree by ensure-core-worktree

[Stefan Beller]

> > +             cfg_file = xstrfmt("%s/config", subrepo.gitdir);
>
> As I mentioned here:
> https://public-inbox.org/git/20180807230637.247200-1-bmwill@google.com/T/#t
>
> This lines should probably be more like:
>
>   cfg_file = repo_git_path(&subrepo, "config");
>

Why? You did not mention the benefits for writing it this way
here or on the reference. Care to elaborate?

Re: [PATCH 6/7] submodule--helper: replace connect-gitdir-workingtree by ensure-core-worktree

[Brandon Williams]

On 08/10, Stefan Beller wrote:
> > > +             cfg_file = xstrfmt("%s/config", subrepo.gitdir);
> >
> > As I mentioned here:
> > https://public-inbox.org/git/20180807230637.247200-1-bmwill@google.com/T/#t
> >
> > This lines should probably be more like:
> >
> >   cfg_file = repo_git_path(&subrepo, "config");
> >
> 
> Why? You did not mention the benefits for writing it this way
> here or on the reference. Care to elaborate?

Its more future proof especially because we have the difference bettwen
commondir and gitdir for worktrees.  Using the "repo_git_path" function
handles path rewritting when using worktrees.  Here (when working with
worktrees) "subrepo.gitdir" refers to the worktree specific gitdir while
"subrepo.commondir" refers to the global common gitdir where the
repository config actually lives.

-- 
Brandon Williams

[PATCH 0/7] Resend of sb/submodule-update-in-c

[Stefan Beller]

Thanks Brandon for pointing out to use repo_git_path instead of
manually constructing the path.

That is the only change in this resend.

Thanks,
Stefan

Stefan Beller (7):
  git-submodule.sh: align error reporting for update mode to use path
  git-submodule.sh: rename unused variables
  builtin/submodule--helper: factor out submodule updating
  builtin/submodule--helper: store update_clone information in a struct
  builtin/submodule--helper: factor out method to update a single
    submodule
  submodule--helper: replace connect-gitdir-workingtree by
    ensure-core-worktree
  submodule--helper: introduce new update-module-mode helper

 builtin/submodule--helper.c | 216 ++++++++++++++++++++++++++----------
 git-submodule.sh            |  29 +----
 2 files changed, 164 insertions(+), 81 deletions(-)

(I am not yet using format-patches internal range diff version,
but  the paste below is manually crafted; the patch numbers are off, as
the fix was done in the second to last patch)

./git-range-diff origin/sb/submodule-update-in-c...

1:  1c866b9831d ! 1:  7bb6249dea9 submodule--helper: replace connect-gitdir-workingtree by ensure-core-worktree
    @@ -49,7 +49,7 @@
     +		const char *rel_path;
     +		struct strbuf sb = STRBUF_INIT;
     +
    -+		cfg_file = xstrfmt("%s/config", subrepo.gitdir);
    ++		cfg_file = repo_git_path(&subrepo, "config");
     +
     +		abs_path = absolute_pathdup(path);
     +		rel_path = relative_path(abs_path, subrepo.gitdir, &sb);
2:  5a3587e9c25 = 2:  23dc45cee2d submodule--helper: introduce new update-module-mode helper

[PATCH 1/7] git-submodule.sh: align error reporting for update mode to use path

[Stefan Beller]

All other error messages in cmd_update are reporting the submodule based
on its path, so let's do that for invalid update modes, too.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 git-submodule.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/git-submodule.sh b/git-submodule.sh
index 8b5ad59bdee..5a58812645d 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -632,7 +632,7 @@ cmd_update()
 				must_die_on_failure=yes
 				;;
 			*)
-				die "$(eval_gettext "Invalid update mode '$update_module' for submodule '$name'")"
+				die "$(eval_gettext "Invalid update mode '$update_module' for submodule path '$path'")"
 			esac
 
 			if (sanitize_submodule_env; cd "$sm_path" && $command "$sha1")
-- 
2.18.0.865.gffc8e1a3cd6-goog

[PATCH 2/7] git-submodule.sh: rename unused variables

[Stefan Beller]

The 'mode' variable is not used in cmd_update for its original purpose,
rename it to 'dummy' as it only serves the purpose to abort quickly
documenting this knowledge.

The variable 'stage' is also not used any more in cmd_update, so remove it.

This went unnoticed as first each function used the commonly used
submodule listing, which was converted in 74703a1e4df (submodule: rewrite
`module_list` shell function in C, 2015-09-02). When cmd_update was
using its own function starting in 48308681b07 (git submodule update:
have a dedicated helper for cloning, 2016-02-29), its removal was missed.

A later patch in this series also touches the communication between
the submodule helper and git-submodule.sh, but let's have this as
a preparatory patch, as it eases the next patch, which stores the
raw data instead of the line printed for this communication.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/submodule--helper.c | 5 ++---
 git-submodule.sh            | 4 ++--
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index a3c4564c6c8..da700c88963 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -1573,9 +1573,8 @@ static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
 	needs_cloning = !file_exists(sb.buf);
 
 	strbuf_reset(&sb);
-	strbuf_addf(&sb, "%06o %s %d %d\t%s\n", ce->ce_mode,
-			oid_to_hex(&ce->oid), ce_stage(ce),
-			needs_cloning, ce->name);
+	strbuf_addf(&sb, "dummy %s %d\t%s\n",
+		    oid_to_hex(&ce->oid), needs_cloning, ce->name);
 	string_list_append(&suc->projectlines, sb.buf);
 
 	if (!needs_cloning)
diff --git a/git-submodule.sh b/git-submodule.sh
index 5a58812645d..8caaf274e25 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -531,9 +531,9 @@ cmd_update()
 		"$@" || echo "#unmatched" $?
 	} | {
 	err=
-	while read -r mode sha1 stage just_cloned sm_path
+	while read -r quickabort sha1 just_cloned sm_path
 	do
-		die_if_unmatched "$mode" "$sha1"
+		die_if_unmatched "$quickabort" "$sha1"
 
 		name=$(git submodule--helper name "$sm_path") || exit
 		if ! test -z "$update"
-- 
2.18.0.865.gffc8e1a3cd6-goog

[PATCH 3/7] builtin/submodule--helper: factor out submodule updating

[Stefan Beller]

Separate the command line parsing from the actual execution of the command
within the repository. For now there is not a lot of execution as
most of it is still in git-submodule.sh.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/submodule--helper.c | 59 +++++++++++++++++++++----------------
 1 file changed, 33 insertions(+), 26 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index da700c88963..32f00ca6f87 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -1474,6 +1474,8 @@ struct submodule_update_clone {
 	/* failed clones to be retried again */
 	const struct cache_entry **failed_clones;
 	int failed_clones_nr, failed_clones_alloc;
+
+	int max_jobs;
 };
 #define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
 	SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, 0, \
@@ -1716,11 +1718,36 @@ static int git_update_clone_config(const char *var, const char *value,
 	return 0;
 }
 
+static int update_submodules(struct submodule_update_clone *suc)
+{
+	struct string_list_item *item;
+
+	run_processes_parallel(suc->max_jobs,
+			       update_clone_get_next_task,
+			       update_clone_start_failure,
+			       update_clone_task_finished,
+			       suc);
+
+	/*
+	 * We saved the output and put it out all at once now.
+	 * That means:
+	 * - the listener does not have to interleave their (checkout)
+	 *   work with our fetching.  The writes involved in a
+	 *   checkout involve more straightforward sequential I/O.
+	 * - the listener can avoid doing any work if fetching failed.
+	 */
+	if (suc->quickstop)
+		return 1;
+
+	for_each_string_list_item(item, &suc->projectlines)
+		fprintf(stdout, "%s", item->string);
+
+	return 0;
+}
+
 static int update_clone(int argc, const char **argv, const char *prefix)
 {
 	const char *update = NULL;
-	int max_jobs = 1;
-	struct string_list_item *item;
 	struct pathspec pathspec;
 	struct submodule_update_clone suc = SUBMODULE_UPDATE_CLONE_INIT;
 
@@ -1742,7 +1769,7 @@ static int update_clone(int argc, const char **argv, const char *prefix)
 		OPT_STRING(0, "depth", &suc.depth, "<depth>",
 			   N_("Create a shallow clone truncated to the "
 			      "specified number of revisions")),
-		OPT_INTEGER('j', "jobs", &max_jobs,
+		OPT_INTEGER('j', "jobs", &suc.max_jobs,
 			    N_("parallel jobs")),
 		OPT_BOOL(0, "recommend-shallow", &suc.recommend_shallow,
 			    N_("whether the initial clone should follow the shallow recommendation")),
@@ -1758,8 +1785,8 @@ static int update_clone(int argc, const char **argv, const char *prefix)
 	};
 	suc.prefix = prefix;
 
-	update_clone_config_from_gitmodules(&max_jobs);
-	git_config(git_update_clone_config, &max_jobs);
+	update_clone_config_from_gitmodules(&suc.max_jobs);
+	git_config(git_update_clone_config, &suc.max_jobs);
 
 	argc = parse_options(argc, argv, prefix, module_update_clone_options,
 			     git_submodule_helper_usage, 0);
@@ -1774,27 +1801,7 @@ static int update_clone(int argc, const char **argv, const char *prefix)
 	if (pathspec.nr)
 		suc.warn_if_uninitialized = 1;
 
-	run_processes_parallel(max_jobs,
-			       update_clone_get_next_task,
-			       update_clone_start_failure,
-			       update_clone_task_finished,
-			       &suc);
-
-	/*
-	 * We saved the output and put it out all at once now.
-	 * That means:
-	 * - the listener does not have to interleave their (checkout)
-	 *   work with our fetching.  The writes involved in a
-	 *   checkout involve more straightforward sequential I/O.
-	 * - the listener can avoid doing any work if fetching failed.
-	 */
-	if (suc.quickstop)
-		return 1;
-
-	for_each_string_list_item(item, &suc.projectlines)
-		fprintf(stdout, "%s", item->string);
-
-	return 0;
+	return update_submodules(&suc);
 }
 
 static int resolve_relative_path(int argc, const char **argv, const char *prefix)
-- 
2.18.0.865.gffc8e1a3cd6-goog

[PATCH 4/7] builtin/submodule--helper: store update_clone information in a struct

[Stefan Beller]

The information that is printed for update_submodules in
'submodule--helper update-clone' and consumed by 'git submodule update'
is stored as a string per submodule. This made sense at the time of
48308681b07 (git submodule update: have a dedicated helper for cloning,
2016-02-29), but as we want to migrate the rest of the submodule update
into C, we're better off having access to the raw information in a helper
struct.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/submodule--helper.c | 37 +++++++++++++++++++++++++++----------
 1 file changed, 27 insertions(+), 10 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 32f00ca6f87..40b94dd622e 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -1446,6 +1446,12 @@ static int module_clone(int argc, const char **argv, const char *prefix)
 	return 0;
 }
 
+struct update_clone_data {
+	const struct submodule *sub;
+	struct object_id oid;
+	unsigned just_cloned;
+};
+
 struct submodule_update_clone {
 	/* index into 'list', the list of submodules to look into for cloning */
 	int current;
@@ -1465,8 +1471,9 @@ struct submodule_update_clone {
 	const char *recursive_prefix;
 	const char *prefix;
 
-	/* Machine-readable status lines to be consumed by git-submodule.sh */
-	struct string_list projectlines;
+	/* to be consumed by git-submodule.sh */
+	struct update_clone_data *update_clone;
+	int update_clone_nr; int update_clone_alloc;
 
 	/* If we want to stop as fast as possible and return an error */
 	unsigned quickstop : 1;
@@ -1480,7 +1487,7 @@ struct submodule_update_clone {
 #define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
 	SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, 0, \
 	NULL, NULL, NULL, \
-	STRING_LIST_INIT_DUP, 0, NULL, 0, 0}
+	NULL, 0, 0, 0, NULL, 0, 0, 0}
 
 
 static void next_submodule_warn_missing(struct submodule_update_clone *suc,
@@ -1574,10 +1581,12 @@ static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
 	strbuf_addf(&sb, "%s/.git", ce->name);
 	needs_cloning = !file_exists(sb.buf);
 
-	strbuf_reset(&sb);
-	strbuf_addf(&sb, "dummy %s %d\t%s\n",
-		    oid_to_hex(&ce->oid), needs_cloning, ce->name);
-	string_list_append(&suc->projectlines, sb.buf);
+	ALLOC_GROW(suc->update_clone, suc->update_clone_nr + 1,
+		   suc->update_clone_alloc);
+	oidcpy(&suc->update_clone[suc->update_clone_nr].oid, &ce->oid);
+	suc->update_clone[suc->update_clone_nr].just_cloned = needs_cloning;
+	suc->update_clone[suc->update_clone_nr].sub = sub;
+	suc->update_clone_nr++;
 
 	if (!needs_cloning)
 		goto cleanup;
@@ -1720,7 +1729,8 @@ static int git_update_clone_config(const char *var, const char *value,
 
 static int update_submodules(struct submodule_update_clone *suc)
 {
-	struct string_list_item *item;
+	int i;
+	struct strbuf sb = STRBUF_INIT;
 
 	run_processes_parallel(suc->max_jobs,
 			       update_clone_get_next_task,
@@ -1739,9 +1749,16 @@ static int update_submodules(struct submodule_update_clone *suc)
 	if (suc->quickstop)
 		return 1;
 
-	for_each_string_list_item(item, &suc->projectlines)
-		fprintf(stdout, "%s", item->string);
+	for (i = 0; i < suc->update_clone_nr; i++) {
+		strbuf_addf(&sb, "dummy %s %d\t%s\n",
+			oid_to_hex(&suc->update_clone[i].oid),
+			suc->update_clone[i].just_cloned,
+			suc->update_clone[i].sub->path);
+		fprintf(stdout, "%s", sb.buf);
+		strbuf_reset(&sb);
+	}
 
+	strbuf_release(&sb);
 	return 0;
 }
 
-- 
2.18.0.865.gffc8e1a3cd6-goog

[PATCH 5/7] builtin/submodule--helper: factor out method to update a single submodule

[Stefan Beller]

In a later patch we'll find this method handy.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/submodule--helper.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 40b94dd622e..8b1088ab58a 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -1727,10 +1727,17 @@ static int git_update_clone_config(const char *var, const char *value,
 	return 0;
 }
 
+static void update_submodule(struct update_clone_data *ucd)
+{
+	fprintf(stdout, "dummy %s %d\t%s\n",
+		oid_to_hex(&ucd->oid),
+		ucd->just_cloned,
+		ucd->sub->path);
+}
+
 static int update_submodules(struct submodule_update_clone *suc)
 {
 	int i;
-	struct strbuf sb = STRBUF_INIT;
 
 	run_processes_parallel(suc->max_jobs,
 			       update_clone_get_next_task,
@@ -1749,16 +1756,9 @@ static int update_submodules(struct submodule_update_clone *suc)
 	if (suc->quickstop)
 		return 1;
 
-	for (i = 0; i < suc->update_clone_nr; i++) {
-		strbuf_addf(&sb, "dummy %s %d\t%s\n",
-			oid_to_hex(&suc->update_clone[i].oid),
-			suc->update_clone[i].just_cloned,
-			suc->update_clone[i].sub->path);
-		fprintf(stdout, "%s", sb.buf);
-		strbuf_reset(&sb);
-	}
+	for (i = 0; i < suc->update_clone_nr; i++)
+		update_submodule(&suc->update_clone[i]);
 
-	strbuf_release(&sb);
 	return 0;
 }
 
-- 
2.18.0.865.gffc8e1a3cd6-goog

[PATCH 6/7] submodule--helper: replace connect-gitdir-workingtree by ensure-core-worktree

[Stefan Beller]

e98317508c0 (submodule: ensure core.worktree is set after update,
2018-06-18) was overly aggressive in calling connect_work_tree_and_git_dir
as that ensures both the 'core.worktree' configuration is set as well as
setting up correct gitlink file pointing at the git directory.

We do not need to check for the gitlink in this part of the cmd_update
in git-submodule.sh, as the initial call to update-clone will have ensured
that. So we can reduce the work to only (check and potentially) set the
'core.worktree' setting.

While at it move the check from shell to C as that proves to be useful in
a follow up patch, as we do not need the 'name' in shell now.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/submodule--helper.c | 64 +++++++++++++++++++++++--------------
 git-submodule.sh            |  7 ++--
 2 files changed, 42 insertions(+), 29 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 8b1088ab58a..648e1330c15 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -1964,6 +1964,45 @@ static int push_check(int argc, const char **argv, const char *prefix)
 	return 0;
 }
 
+static int ensure_core_worktree(int argc, const char **argv, const char *prefix)
+{
+	const struct submodule *sub;
+	const char *path;
+	char *cw;
+	struct repository subrepo;
+
+	if (argc != 2)
+		BUG("submodule--helper connect-gitdir-workingtree <name> <path>");
+
+	path = argv[1];
+
+	sub = submodule_from_path(the_repository, &null_oid, path);
+	if (!sub)
+		BUG("We could get the submodule handle before?");
+
+	if (repo_submodule_init(&subrepo, the_repository, path))
+		die(_("could not get a repository handle for submodule '%s'"), path);
+
+	if (!repo_config_get_string(&subrepo, "core.worktree", &cw)) {
+		char *cfg_file, *abs_path;
+		const char *rel_path;
+		struct strbuf sb = STRBUF_INIT;
+
+		cfg_file = repo_git_path(&subrepo, "config");
+
+		abs_path = absolute_pathdup(path);
+		rel_path = relative_path(abs_path, subrepo.gitdir, &sb);
+
+		git_config_set_in_file(cfg_file, "core.worktree", rel_path);
+
+		free(cfg_file);
+		free(abs_path);
+		strbuf_release(&sb);
+	}
+
+	return 0;
+}
+
 static int absorb_git_dirs(int argc, const char **argv, const char *prefix)
 {
 	int i;
@@ -2029,29 +2068,6 @@ static int check_name(int argc, const char **argv, const char *prefix)
 	return 0;
 }
 
-static int connect_gitdir_workingtree(int argc, const char **argv, const char *prefix)
-{
-	struct strbuf sb = STRBUF_INIT;
-	const char *name, *path;
-	char *sm_gitdir;
-
-	if (argc != 3)
-		BUG("submodule--helper connect-gitdir-workingtree <name> <path>");
-
-	name = argv[1];
-	path = argv[2];
-
-	strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
-	sm_gitdir = absolute_pathdup(sb.buf);
-
-	connect_work_tree_and_git_dir(path, sm_gitdir, 0);
-
-	strbuf_release(&sb);
-	free(sm_gitdir);
-
-	return 0;
-}
-
 #define SUPPORT_SUPER_PREFIX (1<<0)
 
 struct cmd_struct {
@@ -2065,7 +2081,7 @@ static struct cmd_struct commands[] = {
 	{"name", module_name, 0},
 	{"clone", module_clone, 0},
 	{"update-clone", update_clone, 0},
-	{"connect-gitdir-workingtree", connect_gitdir_workingtree, 0},
+	{"ensure-core-worktree", ensure_core_worktree, 0},
 	{"relative-path", resolve_relative_path, 0},
 	{"resolve-relative-url", resolve_relative_url, 0},
 	{"resolve-relative-url-test", resolve_relative_url_test, 0},
diff --git a/git-submodule.sh b/git-submodule.sh
index 8caaf274e25..19d010eac06 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -535,6 +535,8 @@ cmd_update()
 	do
 		die_if_unmatched "$quickabort" "$sha1"
 
+		git submodule--helper ensure-core-worktree "$sm_path"
+
 		name=$(git submodule--helper name "$sm_path") || exit
 		if ! test -z "$update"
 		then
@@ -577,11 +579,6 @@ cmd_update()
 			die "$(eval_gettext "Unable to find current \${remote_name}/\${branch} revision in submodule path '\$sm_path'")"
 		fi
 
-		if ! $(git config -f "$(git rev-parse --git-common-dir)/modules/$name/config" core.worktree) 2>/dev/null
-		then
-			git submodule--helper connect-gitdir-workingtree "$name" "$sm_path"
-		fi
-
 		if test "$subsha1" != "$sha1" || test -n "$force"
 		then
 			subforce=$force
-- 
2.18.0.865.gffc8e1a3cd6-goog

[PATCH 7/7] submodule--helper: introduce new update-module-mode helper

[Stefan Beller]

This chews off a bit of the shell part of the update command in
git-submodule.sh. When writing the C code, keep in mind that the
submodule--helper part will go away eventually and we want to have
a C function that is able to determine the submodule update strategy,
it as a nicety, make determine_submodule_update_strategy accessible
for arbitrary repositories.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/submodule--helper.c | 61 +++++++++++++++++++++++++++++++++++++
 git-submodule.sh            | 16 +---------
 2 files changed, 62 insertions(+), 15 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 648e1330c15..5c9d1fb496d 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -1446,6 +1446,66 @@ static int module_clone(int argc, const char **argv, const char *prefix)
 	return 0;
 }
 
+static void determine_submodule_update_strategy(struct repository *r,
+						int just_cloned,
+						const char *path,
+						const char *update,
+						struct submodule_update_strategy *out)
+{
+	const struct submodule *sub = submodule_from_path(r, &null_oid, path);
+	char *key;
+	const char *val;
+
+	key = xstrfmt("submodule.%s.update", sub->name);
+
+	if (update) {
+		trace_printf("parsing update");
+		if (parse_submodule_update_strategy(update, out) < 0)
+			die(_("Invalid update mode '%s' for submodule path '%s'"),
+				update, path);
+	} else if (!repo_config_get_string_const(r, key, &val)) {
+		if (parse_submodule_update_strategy(val, out) < 0)
+			die(_("Invalid update mode '%s' configured for submodule path '%s'"),
+				val, path);
+	} else if (sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
+		trace_printf("loaded thing");
+		out->type = sub->update_strategy.type;
+		out->command = sub->update_strategy.command;
+	} else
+		out->type = SM_UPDATE_CHECKOUT;
+
+	if (just_cloned &&
+	    (out->type == SM_UPDATE_MERGE ||
+	     out->type == SM_UPDATE_REBASE ||
+	     out->type == SM_UPDATE_NONE))
+		out->type = SM_UPDATE_CHECKOUT;
+
+	free(key);
+}
+
+static int module_update_module_mode(int argc, const char **argv, const char *prefix)
+{
+	const char *path, *update = NULL;
+	int just_cloned;
+	struct submodule_update_strategy update_strategy = { .type = SM_UPDATE_CHECKOUT };
+
+	if (argc < 3 || argc > 4)
+		die("submodule--helper update-module-clone expects <just-cloned> <path> [<update>]");
+
+	just_cloned = git_config_int("just_cloned", argv[1]);
+	path = argv[2];
+
+	if (argc == 4)
+		update = argv[3];
+
+	determine_submodule_update_strategy(the_repository,
+					    just_cloned, path, update,
+					    &update_strategy);
+	fputs(submodule_strategy_to_string(&update_strategy), stdout);
+
+	return 0;
+}
+
 struct update_clone_data {
 	const struct submodule *sub;
 	struct object_id oid;
@@ -2080,6 +2140,7 @@ static struct cmd_struct commands[] = {
 	{"list", module_list, 0},
 	{"name", module_name, 0},
 	{"clone", module_clone, 0},
+	{"update-module-mode", module_update_module_mode, 0},
 	{"update-clone", update_clone, 0},
 	{"ensure-core-worktree", ensure_core_worktree, 0},
 	{"relative-path", resolve_relative_path, 0},
diff --git a/git-submodule.sh b/git-submodule.sh
index 19d010eac06..19c9f1215e1 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -537,27 +537,13 @@ cmd_update()
 
 		git submodule--helper ensure-core-worktree "$sm_path"
 
-		name=$(git submodule--helper name "$sm_path") || exit
-		if ! test -z "$update"
-		then
-			update_module=$update
-		else
-			update_module=$(git config submodule."$name".update)
-			if test -z "$update_module"
-			then
-				update_module="checkout"
-			fi
-		fi
+		update_module=$(git submodule--helper update-module-mode $just_cloned "$sm_path" $update)
 
 		displaypath=$(git submodule--helper relative-path "$prefix$sm_path" "$wt_prefix")
 
 		if test $just_cloned -eq 1
 		then
 			subsha1=
-			case "$update_module" in
-			merge | rebase | none)
-				update_module=checkout ;;
-			esac
 		else
 			subsha1=$(sanitize_submodule_env; cd "$sm_path" &&
 				git rev-parse --verify HEAD) ||
-- 
2.18.0.865.gffc8e1a3cd6-goog

Re: [PATCH 0/7] Resend of sb/submodule-update-in-c

[Junio C Hamano]

Stefan Beller <sbeller@google.com> writes:

> Thanks Brandon for pointing out to use repo_git_path instead of
> manually constructing the path.
>
> That is the only change in this resend.

Rcpt.  Hopefully this is now ready for 'next'?

Re: [PATCH 0/7] Resend of sb/submodule-update-in-c

[Stefan Beller]

gist
On Tue, Aug 14, 2018 at 2:01 PM Junio C Hamano <gitster@pobox.com> wrote:
>
> Stefan Beller <sbeller@google.com> writes:
>
> > Thanks Brandon for pointing out to use repo_git_path instead of
> > manually constructing the path.
> >
> > That is the only change in this resend.
>
> Rcpt.  Hopefully this is now ready for 'next'?

I don't know any reasons opposing its progression.

So, Yes, I think it is.

Stefan

Re: [PATCH 7/7] submodule--helper: introduce new update-module-mode helper

[Duy Nguyen]

On Tue, Aug 14, 2018 at 12:45 AM Stefan Beller <sbeller@google.com> wrote:
> +static int module_update_module_mode(int argc, const char **argv, const char *prefix)
> +{
> +       const char *path, *update = NULL;
> +       int just_cloned;
> +       struct submodule_update_strategy update_strategy = { .type = SM_UPDATE_CHECKOUT };
> +
> +       if (argc < 3 || argc > 4)
> +               die("submodule--helper update-module-clone expects <just-cloned> <path> [<update>]");

Maybe _() ?
-- 
Duy

Re: [PATCH 7/7] submodule--helper: introduce new update-module-mode helper

[Stefan Beller]

On Sat, Aug 18, 2018 at 9:11 AM Duy Nguyen <pclouds@gmail.com> wrote:
>
> On Tue, Aug 14, 2018 at 12:45 AM Stefan Beller <sbeller@google.com> wrote:
> > +static int module_update_module_mode(int argc, const char **argv, const char *prefix)
> > +{
> > +       const char *path, *update = NULL;
> > +       int just_cloned;
> > +       struct submodule_update_strategy update_strategy = { .type = SM_UPDATE_CHECKOUT };
> > +
> > +       if (argc < 3 || argc > 4)
> > +               die("submodule--helper update-module-clone expects <just-cloned> <path> [<update>]");
>
> Maybe _() ?

I would rather not, as the submodule--helper is "internal only" and these die()
calls could be clarified via

    #define BUG_IN_CALLING_SH(x) die(x)

After the conversion to C is done, all these submodule helpers would go away,
so I'd not burden the translators too much?

Thanks,
Stefan