mimic unpack-objects when --stdin is used with index-pack

It appears that git-unpack-objects writes the last part of the input
buffer to stdout after the pack has been parsed.  This looks a bit
suspicious since the last fill() might have filled the buffer up to
the 4096 byte limit and more data might still be pending on stdin,
but since this is about being a drop-in replacement for unpack-objects
let's simply duplicate the same behavior for now.

[jc: with fix-up appeared in Nico's sleep]

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 16 insertions, 3 deletions

diff --git a/index-pack.c b/index-pack.c
index 2046b37e4b..5c747a62ba 100644
--- a/index-pack.c
+++ b/index-pack.c
@@ -456,11 +456,12 @@ static void parse_pack_objects(unsigned char *sha1)
 	SHA1_Final(sha1, &input_ctx);
 	if (hashcmp(fill(20), sha1))
 		die("pack is corrupted (SHA1 mismatch)");
+	use(20);
 
 	/* If input_fd is a file, we should have reached its end now. */
 	if (fstat(input_fd, &st))
 		die("cannot fstat packfile: %s", strerror(errno));
-	if (S_ISREG(st.st_mode) && st.st_size != consumed_bytes + 20)
+	if (S_ISREG(st.st_mode) && st.st_size != consumed_bytes)
 		die("pack has junk at the end");
 
 	if (!nr_deltas)
@@ -765,6 +766,18 @@ static void final(const char *final_pack_name, const char *curr_pack_name,
 		if (err)
 			die("error while closing pack file: %s", strerror(errno));
 		chmod(curr_pack_name, 0444);
+
+		/*
+		 * Let's just mimic git-unpack-objects here and write
+		 * the last part of the buffer to stdout.
+		 */
+		while (input_len) {
+			err = xwrite(1, input_buffer + input_offset, input_len);
+			if (err <= 0)
+				break;
+			input_len -= err;
+			input_offset += err;
+		}
 	}
 
 	if (final_pack_name != curr_pack_name) {
@@ -863,7 +876,6 @@ int main(int argc, char **argv)
 			    nr_deltas - nr_resolved_deltas);
 	} else {
 		/* Flush remaining pack final 20-byte SHA1. */
-		use(20);
 		flush();
 	}
 	free(deltas);
@@ -872,7 +884,8 @@ int main(int argc, char **argv)
 	free(objects);
 	free(index_name_buf);
 
-	printf("%s\n", sha1_to_hex(sha1));
+	if (!from_stdin)
+		printf("%s\n", sha1_to_hex(sha1));
 
 	return 0;
 }