Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx> writes:
> 9f673f9 (gc: config option for running --auto in background -
> 2014-02-08) puts "gc --auto" in background to reduce user's wait
> time. Part of the garbage collecting is pack-refs and pruning
> reflogs. These require locking some refs and may abort other processes
> trying to lock the same ref. If gc --auto is fired in the middle of a
> script, gc's holding locks in the background could fail the script,
> which could never happen before 9f673f9.
>
> Keep running pack-refs and "reflog --prune" in foreground to stop
> parallel ref updates. The remaining background operations (repack,
> prune and rerere) should impact running git processes.
>
> Reported-by: Adam Borowski <kilobyte@xxxxxxxxxx>
> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
> ---
> builtin/gc.c | 26 ++++++++++++++++++++------
> 1 file changed, 20 insertions(+), 6 deletions(-)
OK, as it happens the order of various gc phases we have is already
to run pack-refs and reflog expire before everything else, so this
change does not affect semantics, which is good ;-)
> diff --git a/builtin/gc.c b/builtin/gc.c
> index 85f5c2b..8d219d8 100644
> --- a/builtin/gc.c
> +++ b/builtin/gc.c
> @@ -26,6 +26,7 @@ static const char * const builtin_gc_usage[] = {
> };
>
> static int pack_refs = 1;
> +static int prune_reflogs = 1;
> static int aggressive_depth = 250;
> static int aggressive_window = 250;
> static int gc_auto_threshold = 6700;
> @@ -258,6 +259,19 @@ static const char *lock_repo_for_gc(int force, pid_t* ret_pid)
> return NULL;
> }
>
> +static int gc_before_repack(void)
> +{
> + if (pack_refs && run_command_v_opt(pack_refs_cmd.argv, RUN_GIT_CMD))
> + return error(FAILED_RUN, pack_refs_cmd.argv[0]);
> +
> + if (prune_reflogs && run_command_v_opt(reflog.argv, RUN_GIT_CMD))
> + return error(FAILED_RUN, reflog.argv[0]);
> +
> + pack_refs = 0;
> + prune_reflogs = 0;
> + return 0;
> +}
> +
> int cmd_gc(int argc, const char **argv, const char *prefix)
> {
> int aggressive = 0;
> @@ -320,12 +334,15 @@ int cmd_gc(int argc, const char **argv, const char *prefix)
> fprintf(stderr, _("Auto packing the repository for optimum performance.\n"));
> fprintf(stderr, _("See \"git help gc\" for manual housekeeping.\n"));
> }
> - if (detach_auto)
> + if (detach_auto) {
> + if (gc_before_repack())
> + return -1;
> /*
> * failure to daemonize is ok, we'll continue
> * in foreground
> */
> daemonize();
> + }
> } else
> add_repack_all_option();
>
> @@ -337,11 +354,8 @@ int cmd_gc(int argc, const char **argv, const char *prefix)
> name, (uintmax_t)pid);
> }
>
> - if (pack_refs && run_command_v_opt(pack_refs_cmd.argv, RUN_GIT_CMD))
> - return error(FAILED_RUN, pack_refs_cmd.argv[0]);
> -
> - if (run_command_v_opt(reflog.argv, RUN_GIT_CMD))
> - return error(FAILED_RUN, reflog.argv[0]);
> + if (gc_before_repack())
> + return -1;
>
> if (run_command_v_opt(repack.argv, RUN_GIT_CMD))
> return error(FAILED_RUN, repack.argv[0]);
--
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