From f061e5fdd6a65216976a8bd547b2340e6297217b Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Wed, 24 May 2006 21:48:34 -0700 Subject: [PATCH] fetch-pack: give up after getting too many "ack continue" If your repository have more roots than the remote repository you ask an object for, the remote upload-pack keeps responding "ack continue" until it fills up its received-have buffer (currently 256 entries). Usually this is not a problem because the requester stops traversing the ancestry chain from the commit it gets "ack continue" for, but this mechanism does not work as a roadblock when it traverses down the path to the root the other side does not have. Signed-off-by: Junio C Hamano --- fetch-pack.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/fetch-pack.c b/fetch-pack.c index 8daa93d02..837134855 100644 --- a/fetch-pack.c +++ b/fetch-pack.c @@ -18,6 +18,12 @@ static const char *exec = "git-upload-pack"; #define SEEN (1U << 3) #define POPPED (1U << 4) +/* + * After sending this many "have"s if we do not get any new ACK , we + * give up traversing our history. + */ +#define MAX_IN_VAIN 256 + static struct commit_list *rev_list = NULL; static int non_common_revs = 0, multi_ack = 0, use_thin_pack = 0; @@ -134,6 +140,8 @@ static int find_common(int fd[2], unsigned char *result_sha1, int fetching; int count = 0, flushes = 0, retval; const unsigned char *sha1; + unsigned in_vain = 0; + int got_continue = 0; for_each_ref(rev_list_insert_ref); @@ -172,6 +180,7 @@ static int find_common(int fd[2], unsigned char *result_sha1, packet_write(fd[1], "have %s\n", sha1_to_hex(sha1)); if (verbose) fprintf(stderr, "have %s\n", sha1_to_hex(sha1)); + in_vain++; if (!(31 & ++count)) { int ack; @@ -200,9 +209,16 @@ static int find_common(int fd[2], unsigned char *result_sha1, lookup_commit(result_sha1); mark_common(commit, 0, 1); retval = 0; + in_vain = 0; + got_continue = 1; } } while (ack); flushes--; + if (got_continue && MAX_IN_VAIN < in_vain) { + if (verbose) + fprintf(stderr, "giving up\n"); + break; /* give up */ + } } } done: -- 2.26.2