[PATCH] Allow git-update-index work on subprojects

[Alex Riesen <raa.lkml@gmail.com>]

Also, make "git commit -a" work with modifications of subproject HEADs.

---

This one works with update-index --remove (which is what git-commit -a
uses). It is ugly. I tried to keep the "F -> D/F" behaviour of
update-index. Still have to check if "F -> Subproject" works.

 builtin-update-index.c |   45 +++++++++++++++++++++++++--------------------
 1 files changed, 25 insertions(+), 20 deletions(-)

diff --git a/builtin-update-index.c b/builtin-update-index.c
index eba756d..d075d50 100644
--- a/builtin-update-index.c
+++ b/builtin-update-index.c
@@ -62,7 +62,7 @@ static int mark_valid(const char *path)
 
 static int process_file(const char *path)
 {
-	int size, namelen, option, status;
+	int size, namelen = -1, option, status;
 	struct cache_entry *ce;
 	struct stat st;
 
@@ -73,7 +73,7 @@ static int process_file(const char *path)
 	 */
 	cache_tree_invalidate_path(active_cache_tree, path);
 
-	if (status < 0 || S_ISDIR(st.st_mode)) {
+	if (!status && S_ISDIR(st.st_mode)) {
 		/* When we used to have "path" and now we want to add
 		 * "path/file", we need a way to remove "path" before
 		 * being able to add "path/file".  However,
@@ -82,27 +82,32 @@ static int process_file(const char *path)
 		 * friendly, especially since we can do the opposite
 		 * case just fine without --force-remove.
 		 */
-		if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
-			if (allow_remove) {
-				if (remove_file_from_cache(path))
-					return error("%s: cannot remove from the index",
-					             path);
-				else
-					return 0;
-			} else if (status < 0) {
+		namelen = strlen(path);
+		int pos = cache_name_pos(path, namelen);
+		if (0 <= pos && S_ISREG(ntohl(active_cache[pos]->ce_mode)) &&
+		    allow_remove) {
+			if (remove_file_from_cache(path))
+				return error("%s: cannot remove from the index", path);
+			else
+				return 0;
+		}
+	}
+
+	if (status < 0) {
+		if (errno == ENOENT || errno == ENOTDIR) {
+			if (!allow_remove)
 				return error("%s: does not exist and --remove not passed",
-				             path);
-			}
+					     path);
+			if (remove_file_from_cache(path))
+				return error("%s: cannot remove from the index",
+					     path);
+			return 0;
 		}
-		if (0 == status)
-			return error("%s: is a directory - add files inside instead",
-			             path);
-		else
-			return error("lstat(\"%s\"): %s", path,
-				     strerror(errno));
+		return error("lstat(\"%s\"): %s", path, strerror(errno));
 	}
 
-	namelen = strlen(path);
+	if (namelen < 0)
+		namelen = strlen(path);
 	size = cache_entry_size(namelen);
 	ce = xcalloc(1, size);
 	memcpy(ce->name, path, namelen);
@@ -211,7 +216,7 @@ static void update_one(const char *path, const char *prefix, int prefix_length)
 		goto free_return;
 	}
 	if (process_file(p))
-		die("Unable to process file %s", path);
+		die("Unable to process \"%s\"", path);
 	report("add '%s'", path);
  free_return:
 	if (p < path || p > path + strlen(path))
-- 
1.5.1.135.g19a57-dirty