[PATCH 11/16] teach unpack_trees() to remove submodule contents

[Stefan Beller <sbeller@google.com>]

Extend rmdir_or_warn() to remove the directories of those submodules which
are scheduled for removal. Also teach verify_clean_submodule() to check
that a submodule configured to be removed is not modified before scheduling
it for removal.

Signed-off-by: Stefan Beller <sbeller@google.com>
---
 unpack-trees.c | 6 ++----
 wrapper.c      | 4 ++++
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/unpack-trees.c b/unpack-trees.c
index ea6bdd2..576e1d5 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -9,6 +9,7 @@
 #include "refs.h"
 #include "attr.h"
 #include "split-index.h"
+#include "submodule.h"
 #include "dir.h"
 
 /*
@@ -1361,15 +1362,12 @@ static void invalidate_ce_path(const struct cache_entry *ce,
 /*
  * Check that checking out ce->sha1 in subdir ce->name is not
  * going to overwrite any working files.
- *
- * Currently, git does not checkout subprojects during a superproject
- * checkout, so it is not going to overwrite anything.
  */
 static int verify_clean_submodule(const struct cache_entry *ce,
 				  enum unpack_trees_error_types error_type,
 				  struct unpack_trees_options *o)
 {
-	return 0;
+	return submodule_is_interesting(ce->name, null_sha1) && is_submodule_modified(ce->name, 0);
 }
 
 static int verify_clean_subdirectory(const struct cache_entry *ce,
diff --git a/wrapper.c b/wrapper.c
index e7f1979..17c08de 100644
--- a/wrapper.c
+++ b/wrapper.c
@@ -2,6 +2,7 @@
  * Various trivial helper wrappers around standard functions
  */
 #include "cache.h"
+#include "submodule.h"
 
 static void do_nothing(size_t size)
 {
@@ -592,6 +593,9 @@ int unlink_or_warn(const char *file)
 
 int rmdir_or_warn(const char *file)
 {
+	if (submodule_is_interesting(file, null_sha1)
+	    && depopulate_submodule(file))
+		return -1;
 	return warn_if_unremovable("rmdir", file, rmdir(file));
 }
 
-- 
2.10.1.469.g00a8914