[PATCH] Expose object ID computation functions.

This patch makes the first half of write_sha1_file() and
index_fd() externally visible, to allow callers to compute the
object ID without actually storing it in the object database.

[JC demangled the whitespaces himself because he liked the patch
 so much, and reworked the interface to index_fd() slightly,
 taking suggestion from Linus and of his own.]

Signed-off-by: Bryan Larsen <bryan.larsen@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 45 insertions, 0 deletions

diff --git a/hash-object.c b/hash-object.c
new file mode 100644
index 0000000000..0821e543f5
--- /dev/null
+++ b/hash-object.c
@@ -0,0 +1,45 @@
+/*
+ * GIT - The information manager from hell
+ *
+ * Copyright (C) Linus Torvalds, 2005
+ * Copyright (C) Junio C Hamano, 2005 
+ */
+#include "cache.h"
+
+static void hash_object(const char *path, const char *type, int write_object)
+{
+	int fd;
+	struct stat st;
+	unsigned char sha1[20];
+	fd = open(path, O_RDONLY);
+	if (fd < 0 ||
+	    fstat(fd, &st) < 0 ||
+	    index_fd(sha1, fd, &st, write_object, type))
+		die(write_object
+		    ? "Unable to add %s to database"
+		    : "Unable to hash %s", path);
+	printf("%s\n", sha1_to_hex(sha1));
+}
+
+static const char *hash_object_usage =
+"git-hash-object [-t <type>] [-w] <file>...";
+
+int main(int argc, char **argv)
+{
+	int i;
+	const char *type = "blob";
+	int write_object = 0;
+
+	for (i = 1 ; i < argc; i++) {
+		if (!strcmp(argv[i], "-t")) {
+			if (argc <= ++i)
+				die(hash_object_usage);
+			type = argv[i];
+		}
+		else if (!strcmp(argv[i], "-w"))
+			write_object = 1;
+		else
+			hash_object(argv[i], type, write_object);
+	}
+	return 0;
+}