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pack-objects: warn on split packs disabling bitmaps

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It can be tempting for a server admin to want a stable set of
long-lived packs for dumb clients; but also want to enable bitmaps
to serve smart clients more quickly.

Unfortunately, such a configuration is impossible; so at least warn
users of this incompatibility since commit 21134714 (pack-objects:
turn off bitmaps when we split packs, 2014-10-16).

Tested the warning by inspecting the output of:

	make -C t t5310-pack-bitmaps.sh GIT_TEST_OPTS=-v

Signed-off-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Eric Wong 2016-04-28 07:28:55 +00:00 committed by Junio C Hamano
parent 625efa9dec
commit 9cea46cdda
4 changed files with 23 additions and 9 deletions
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12
Documentation/config.txt
View file

@ -2147,8 +2147,11 @@ pack.packSizeLimit::
The maximum size of a pack. This setting only affects
packing to a file when repacking, i.e. the git:// protocol
is unaffected. It can be overridden by the `--max-pack-size`
option of linkgit:git-repack[1]. The minimum size allowed is
limited to 1 MiB. The default is unlimited.
option of linkgit:git-repack[1]. Reaching this limit results
in the creation of multiple packfiles; which in turn prevents
bitmaps from being created.
The minimum size allowed is limited to 1 MiB.
The default is unlimited.
Common unit suffixes of 'k', 'm', or 'g' are
supported.
@ -2548,8 +2551,9 @@ repack.writeBitmaps::
objects to disk (e.g., when `git repack -a` is run). This
index can speed up the "counting objects" phase of subsequent
packs created for clones and fetches, at the cost of some disk
space and extra time spent on the initial repack. Defaults to
false.
space and extra time spent on the initial repack. This has
no effect if multiple packfiles are created.
Defaults to false.
rerere.autoUpdate::
When set to true, `git-rerere` updates the index with the

3
Documentation/git-pack-objects.txt
View file

@ -110,7 +110,8 @@ base-name::
--max-pack-size=<n>::
Maximum size of each output pack file. The size can be suffixed with
"k", "m", or "g". The minimum size allowed is limited to 1 MiB.
If specified, multiple packfiles may be created.
If specified, multiple packfiles may be created, which also
prevents the creation of a bitmap index.
The default is unlimited, unless the config variable
`pack.packSizeLimit` is set.

8
Documentation/git-repack.txt
View file

@ -106,7 +106,8 @@ other objects in that pack they already have locally.
--max-pack-size=<n>::
Maximum size of each output pack file. The size can be suffixed with
"k", "m", or "g". The minimum size allowed is limited to 1 MiB.
If specified, multiple packfiles may be created.
If specified, multiple packfiles may be created, which also
prevents the creation of a bitmap index.
The default is unlimited, unless the config variable
`pack.packSizeLimit` is set.
@ -115,7 +116,8 @@ other objects in that pack they already have locally.
Write a reachability bitmap index as part of the repack. This
only makes sense when used with `-a` or `-A`, as the bitmaps
must be able to refer to all reachable objects. This option
overrides the setting of `pack.writeBitmaps`.
overrides the setting of `repack.writeBitmaps`. This option
has no effect if multiple packfiles are created.
--pack-kept-objects::
Include objects in `.keep` files when repacking. Note that we
@ -123,7 +125,7 @@ other objects in that pack they already have locally.
This means that we may duplicate objects, but this makes the
option safe to use when there are concurrent pushes or fetches.
This option is generally only useful if you are writing bitmaps
with `-b` or `pack.writeBitmaps`, as it ensures that the
with `-b` or `repack.writeBitmaps`, as it ensures that the
bitmapped packfile has the necessary objects.
Configuration

9
builtin/pack-objects.c
View file

@ -759,6 +759,10 @@ static off_t write_reused_pack(struct sha1file *f)
return reuse_packfile_offset - sizeof(struct pack_header);
}
static const char no_split_warning[] = N_(
"disabling bitmap writing, packs are split due to pack.packSizeLimit"
);
static void write_pack_file(void)
{
uint32_t i = 0, j;
@ -813,7 +817,10 @@ static void write_pack_file(void)
fixup_pack_header_footer(fd, sha1, pack_tmp_name,
nr_written, sha1, offset);
close(fd);
write_bitmap_index = 0;
if (write_bitmap_index) {
warning(_(no_split_warning));
write_bitmap_index = 0;
}
}
if (!pack_to_stdout) {