[RFC PATCHv2 04/17] update submodules: add is_submodule_populated

[Stefan Beller <sbeller@google.com>]

See if a submodule is populated by checking if there
is a .git file or directory at the given path.

Signed-off-by: Stefan Beller <sbeller@google.com>
---
 submodule.c | 11 +++++++++++
 submodule.h |  1 +
 2 files changed, 12 insertions(+)

diff --git a/submodule.c b/submodule.c
index 78b69b5a55..c29153e9ff 100644
--- a/submodule.c
+++ b/submodule.c
@@ -930,6 +930,17 @@ int fetch_populated_submodules(const struct argv_array *options,
 	return spf.result;
 }
 
+int is_submodule_populated(const char *path)
+{
+	int retval = 0;
+	struct strbuf gitdir = STRBUF_INIT;
+	strbuf_addf(&gitdir, "%s/.git", path);
+	if (resolve_gitdir(gitdir.buf))
+		retval = 1;
+	strbuf_release(&gitdir);
+	return retval;
+}
+
 unsigned is_submodule_modified(const char *path, int ignore_untracked)
 {
 	ssize_t len;
diff --git a/submodule.h b/submodule.h
index 5db0b53b3f..a9eabcc3d0 100644
--- a/submodule.h
+++ b/submodule.h
@@ -58,6 +58,7 @@ extern int fetch_populated_submodules(const struct argv_array *options,
 			       const char *prefix, int command_line_option,
 			       int quiet, int max_parallel_jobs);
 extern unsigned is_submodule_modified(const char *path, int ignore_untracked);
+extern int is_submodule_populated(const char *path);
 extern int submodule_uses_gitfile(const char *path);
 extern int ok_to_remove_submodule(const char *path);
 extern int merge_submodule(unsigned char result[20], const char *path,
-- 
2.11.0.rc2.28.g2673dad