From 2201ee09b542693f3c0c00df9482c098474cb1fe Mon Sep 17 00:00:00 2001 From: Stefan Beller Date: Tue, 9 Aug 2016 14:29:13 -0700 Subject: [PATCH] submodule--helper: use parallel processor correctly When developing another patch series I had a temporary state in which git-clone would segfault, when the call was prepared in prepare_to_clone_next_submodule. This lead to the call failing, i.e. in `update_clone_task_finished` the task was scheduled to be tried again. The second call to prepare_to_clone_next_submodule would return 0, as the segfaulted clone did create the .git file already, such that was not considered to need to be cloned again. I was seeing the "BUG: ce was a submodule before?\n" message, which was the correct behavior at the time as my local code was buggy. When trying to debug this failure, I tried to use printing messages into the strbuf that is passed around, but these messages were never printed as the die(..) doesn't flush the `err` strbuf. When implementing the die() in 665b35ecc (2016-06-09, "submodule--helper: initial clone learns retry logic"), I considered this condition to be a severe condition, which should lead to an immediate abort as we do not trust ourselves any more. However the queued messages in `err` are valuable so let's not toss them out by immediately dying, but a graceful return. Another thing to note: The error message itself was misleading. A return value of 0 doesn't indicate the passed in `ce` is not a submodule any more, but just that we do not consider cloning it any more. Signed-off-by: Stefan Beller Signed-off-by: Junio C Hamano --- builtin/submodule--helper.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c index 6f6d67a469..bd7cce65b9 100644 --- a/builtin/submodule--helper.c +++ b/builtin/submodule--helper.c @@ -748,8 +748,12 @@ static int update_clone_get_next_task(struct child_process *child, if (index < suc->failed_clones_nr) { int *p; ce = suc->failed_clones[index]; - if (!prepare_to_clone_next_submodule(ce, child, suc, err)) - die("BUG: ce was a submodule before?"); + if (!prepare_to_clone_next_submodule(ce, child, suc, err)) { + suc->current ++; + strbuf_addf(err, "BUG: submodule considered for cloning," + "doesn't need cloning any more?\n"); + return 0; + } p = xmalloc(sizeof(*p)); *p = suc->current; *idx_task_cb = p; -- 2.11.4.GIT