Simplify and rename find_sha1_file()

Now that we've made the loose SHA1 file reading more careful and
streamlined, we only use the old find_sha1_file() function for checking
whether a loose object file exists at all.

As such, the whole 'return stat information' part of it was just
pointless (nobody cares any more), and the naming of the function is not
really all that relevant either.

So simplify it to not do a 'stat()', but just an existence check (which
is what the callers want), and rename it to 'has_loose_object()' which
matches the use.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

sha1_file.c

@@ -397,21 +397,21 @@ void prepare_alt_odb(void)
 	read_info_alternates(get_object_directory(), 0);
 }
 
-static char *find_sha1_file(const unsigned char *sha1, struct stat *st)
+static int has_loose_object(const unsigned char *sha1)
 {
 	char *name = sha1_file_name(sha1);
 	struct alternate_object_database *alt;
 
-	if (!stat(name, st))
-		return name;
+	if (!access(name, F_OK))
+		return 1;
 	prepare_alt_odb();
 	for (alt = alt_odb_list; alt; alt = alt->next) {
 		name = alt->name;
 		fill_sha1_path(name, sha1);
-		if (!stat(alt->base, st))
-			return alt->base;
+		if (!access(alt->base, F_OK))
+			return 1;
 	}
-	return NULL;
+	return 0;
 }
 
 static unsigned int pack_used_ctr;
@@ -2232,14 +2232,13 @@ int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned cha
 
 int force_object_loose(const unsigned char *sha1, time_t mtime)
 {
-	struct stat st;
 	void *buf;
 	unsigned long len;
 	enum object_type type;
 	char hdr[32];
 	int hdrlen;
 
-	if (find_sha1_file(sha1, &st))
+	if (has_loose_object(sha1))
 		return 0;
 	buf = read_packed_sha1(sha1, &type, &len);
 	if (!buf)
@@ -2272,12 +2271,11 @@ int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed)
 
 int has_sha1_file(const unsigned char *sha1)
 {
-	struct stat st;
 	struct pack_entry e;
 
 	if (find_pack_entry(sha1, &e, NULL))
 		return 1;
-	return find_sha1_file(sha1, &st) ? 1 : 0;
+	return has_loose_object(sha1);
 }
 
 int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)