Teach core object handling functions about gitlinks

This teaches the really fundamental core SHA1 object handling routines
about gitlinks.  We can compare trees with gitlinks in them (although we
can not actually generate patches for them yet - just raw git diffs),
and they show up as commits in "git ls-tree".

We also know to compare gitlinks as if they were directories (ie the
normal "sort as trees" rules apply).

[jc: amended a cut&paste error]

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 19 insertions, 1 deletions

diff --git a/builtin-ls-tree.c b/builtin-ls-tree.c
index 6472610ac2..1cb4dca277 100644
--- a/builtin-ls-tree.c
+++ b/builtin-ls-tree.c
@@ -6,6 +6,7 @@
 #include "cache.h"
 #include "blob.h"
 #include "tree.h"
+#include "commit.h"
 #include "quote.h"
 #include "builtin.h"
 
@@ -59,7 +60,24 @@ static int show_tree(const unsigned char *sha1, const char *base, int baselen,
 	int retval = 0;
 	const char *type = blob_type;
 
-	if (S_ISDIR(mode)) {
+	if (S_ISDIRLNK(mode)) {
+		/*
+		 * Maybe we want to have some recursive version here?
+		 *
+		 * Something like:
+		 *
+		if (show_subprojects(base, baselen, pathname)) {
+			if (fork()) {
+				chdir(base);
+				exec ls-tree;
+			}
+			waitpid();
+		}
+		 *
+		 * ..or similar..
+		 */
+		type = commit_type;
+	} else if (S_ISDIR(mode)) {
 		if (show_recursive(base, baselen, pathname)) {
 			retval = READ_TREE_RECURSIVE;
 			if (!(ls_options & LS_SHOW_TREES))