Add support for "forcing" a ref on the remote side
A "old ref" of all zeroes is considered a "don't care" ref, and allows
us to say "write the new ref regardless of what the old ref contained
(or even if it existed at all)".
This allows (if git-send-pack were to do it) creating new refs, and
fixing up old ones.
diff --git a/receive-pack.c b/receive-pack.c
index 7ce5f1e..0a3e012 100644
--- a/receive-pack.c
+++ b/receive-pack.c
@@ -97,11 +97,22 @@
struct command *commands = NULL;
+static int is_all_zeroes(const char *hex)
+{
+ int i;
+ for (i = 0; i < 40; i++)
+ if (*hex++ != '0')
+ return 0;
+ return 1;
+}
+
static int verify_old_ref(const char *name, char *hex_contents)
{
int fd, ret;
char buffer[60];
+ if (is_all_zeroes(hex_contents))
+ return 0;
fd = open(name, O_RDONLY);
if (fd < 0)
return -1;
@@ -125,8 +136,6 @@
memcpy(lock_name + namelen, ".lock", 6);
strcpy(new_hex, sha1_to_hex(new_sha1));
- new_hex[40] = '\n';
- new_hex[41] = 0;
old_hex = sha1_to_hex(old_sha1);
if (!has_sha1_file(new_sha1))
die("unpack should have generated %s, but I can't find it!", new_hex);
@@ -134,7 +143,14 @@
newfd = open(lock_name, O_CREAT | O_EXCL | O_WRONLY, 0644);
if (newfd < 0)
die("unable to create %s (%s)", lock_name, strerror(errno));
+
+ /* Write the ref with an ending '\n' */
+ new_hex[40] = '\n';
+ new_hex[41] = 0;
written = write(newfd, new_hex, 41);
+ /* Remove the '\n' again */
+ new_hex[40] = 0;
+
close(newfd);
if (written != 41) {
unlink(lock_name);
