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repack: add --keep-unreachable option

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The usual way to do a full repack (and what is done by
git-gc) is to run "repack -Ad --unpack-unreachable=<when>",
which will loosen any unreachable objects newer than
"<when>", and drop any older ones.

This is a safer alternative to "repack -ad", because
"<when>" becomes a grace period during which we will not
drop any new objects that are about to be referenced.
However, it isn't perfectly safe. It's always possible that
a process is about to reference an old object. Even if that
process were to take care to update the timestamp on the
object, there is no atomicity with a simultaneously running
"repack" process.

So while unlikely, there is a small race wherein we may drop
an object that is in the process of being referenced. If you
do automated repacking on a large number of active
repositories, you may hit it eventually, and the result is a
corrupted repository.

It would be nice to fix that race in the long run, but it's
complicated.  In the meantime, there is a much simpler
strategy for automated repository maintenance: do not drop
objects at all. We already have a "--keep-unreachable"
option in pack-objects; we just need to plumb it through
from git-repack.

Note that this _isn't_ plumbed through from git-gc, so at
this point it's strictly a tool for people doing their own
advanced repository maintenance strategy.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King
2016-06-13 00:36:28 -04:00
committed by Junio C Hamano
parent 6a7bcb5471
commit 905f27b86a
3 changed files with 30 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
builtin/repack.c
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@ -146,6 +146,7 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
int pack_everything = 0;
int delete_redundant = 0;
const char *unpack_unreachable = NULL;
int keep_unreachable = 0;
const char *window = NULL, *window_memory = NULL;
const char *depth = NULL;
const char *max_pack_size = NULL;
@ -175,6 +176,8 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
N_("write bitmap index")),
OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
N_("with -A, do not loosen objects older than this")),
OPT_BOOL('k', "keep-unreachable", &keep_unreachable,
N_("with -a, repack unreachable objects")),
OPT_STRING(0, "window", &window, N_("n"),
N_("size of the window used for delta compression")),
OPT_STRING(0, "window-memory", &window_memory, N_("bytes"),
@ -196,6 +199,10 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
if (delete_redundant && repository_format_precious_objects)
die(_("cannot delete packs in a precious-objects repo"));
if (keep_unreachable &&
(unpack_unreachable || (pack_everything & LOOSEN_UNREACHABLE)))
die(_("--keep-unreachable and -A are incompatible"));
if (pack_kept_objects < 0)
pack_kept_objects = write_bitmaps;
@ -239,6 +246,8 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
} else if (pack_everything & LOOSEN_UNREACHABLE) {
argv_array_push(&cmd.args,
"--unpack-unreachable");
} else if (keep_unreachable) {
argv_array_push(&cmd.args, "--keep-unreachable");
} else {
argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
}