Merge branch 'lt/gitlink'

* lt/gitlink:
  Tests for core subproject support
  Expose subprojects as special files to "git diff" machinery
  Fix some "git ls-files -o" fallout from gitlinks
  Teach "git-read-tree -u" to check out submodules as a directory
  Teach git list-objects logic to not follow gitlinks
  Fix gitlink index entry filesystem matching
  Teach "git-read-tree -u" to check out submodules as a directory
  Teach git list-objects logic not to follow gitlinks
  Don't show gitlink directories when we want "other" files
  Teach git-update-index about gitlinks
  Teach directory traversal about subprojects
  Fix thinko in subproject entry sorting
  Teach core object handling functions about gitlinks
  Teach "fsck" not to follow subproject links
  Add "S_IFDIRLNK" file mode infrastructure for git links
  Add 'resolve_gitlink_ref()' helper function
  Avoid overflowing name buffer in deep directory structures
  diff-lib: use ce_mode_from_stat() rather than messing with modes manually

1 files changed, 20 insertions, 0 deletions

diff --git a/diff.c b/diff.c
index fbb79d70a9..1e8e689be2 100644
--- a/diff.c
+++ b/diff.c
@@ -1397,6 +1397,22 @@ static int populate_from_stdin(struct diff_filespec *s)
 	return 0;
 }
 
+static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
+{
+	int len;
+	char *data = xmalloc(100);
+	len = snprintf(data, 100,
+		"Subproject commit %s\n", sha1_to_hex(s->sha1));
+	s->data = data;
+	s->size = len;
+	s->should_free = 1;
+	if (size_only) {
+		s->data = NULL;
+		free(data);
+	}
+	return 0;
+}
+
 /*
  * While doing rename detection and pickaxe operation, we may need to
  * grab the data for the blob (or file) for our own in-core comparison.
@@ -1415,6 +1431,10 @@ int diff_populate_filespec(struct diff_filespec *s, int size_only)
 
 	if (s->data)
 		return err;
+
+	if (S_ISDIRLNK(s->mode))
+		return diff_populate_gitlink(s, size_only);
+
 	if (!s->sha1_valid ||
 	    reuse_worktree_file(s->path, s->sha1, 0)) {
 		struct stat st;