mirror of
https://github.com/git/git
synced 2024-08-25 10:45:59 +00:00
![Jeff King](/assets/img/avatar_default.png)
The git-over-rsync protocol is inefficient and broken, and has been for a long time. It transfers way more objects than it needs (grabbing all of the remote's "objects/", regardless of which objects we need). It does its own ad-hoc parsing of loose and packed refs from the remote, but doesn't properly override packed refs with loose ones, leading to garbage results (e.g., expecting the other side to have an object pointed to by a stale packed-refs entry, or complaining that the other side has two copies of the refs[1]). This latter breakage means that nobody could have successfully pulled from a moderately active repository sincecd547b4
(fetch/push: readd rsync support, 2007-10-01). We never made an official deprecation notice in the release notes for git's rsync protocol, but the tutorial has marked it as such since914328a
(Update tutorial., 2005-08-30). And on the mailing list as far back as Oct 2005, we can find Junio mentioning it as having "been deprecated for quite some time."[2,3,4]. So it was old news then; cogito had deprecated the transport in July of 2005[5] (though it did come back briefly when Linus broke git-http-pull!). Of course some people professed their love of rsync through 2006, but Linus clarified in his usual gentle manner[6]: > Thanks! This is why I still use rsync, even though > everybody and their mother tells me "Linus says rsync is > deprecated." No. You're using rsync because you're actively doing something _wrong_. The deprecation sentiment was reinforced in 2008, with a mention that cloning via rsync is broken (with no fix)[7]. Even the commit porting rsync over to C from shell (cd547b4
) lists it as deprecated! So between the 10 years of informal warnings, and the fact that it has been severely broken since 2007, it's probably safe to simply remove it without further deprecation warnings. [1] http://article.gmane.org/gmane.comp.version-control.git/285101 [2] http://article.gmane.org/gmane.comp.version-control.git/10093 [3] http://article.gmane.org/gmane.comp.version-control.git/17734 [4] http://article.gmane.org/gmane.comp.version-control.git/18911 [5] http://article.gmane.org/gmane.comp.version-control.git/5617 [6] http://article.gmane.org/gmane.comp.version-control.git/19354 [7] http://article.gmane.org/gmane.comp.version-control.git/103635 Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
150 lines
5.2 KiB
Plaintext
150 lines
5.2 KiB
Plaintext
git-repack(1)
|
|
=============
|
|
|
|
NAME
|
|
----
|
|
git-repack - Pack unpacked objects in a repository
|
|
|
|
|
|
SYNOPSIS
|
|
--------
|
|
[verse]
|
|
'git repack' [-a] [-A] [-d] [-f] [-F] [-l] [-n] [-q] [-b] [--window=<n>] [--depth=<n>]
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
|
|
This command is used to combine all objects that do not currently
|
|
reside in a "pack", into a pack. It can also be used to re-organize
|
|
existing packs into a single, more efficient pack.
|
|
|
|
A pack is a collection of objects, individually compressed, with
|
|
delta compression applied, stored in a single file, with an
|
|
associated index file.
|
|
|
|
Packs are used to reduce the load on mirror systems, backup
|
|
engines, disk storage, etc.
|
|
|
|
OPTIONS
|
|
-------
|
|
|
|
-a::
|
|
Instead of incrementally packing the unpacked objects,
|
|
pack everything referenced into a single pack.
|
|
Especially useful when packing a repository that is used
|
|
for private development. Use
|
|
with '-d'. This will clean up the objects that `git prune`
|
|
leaves behind, but `git fsck --full --dangling` shows as
|
|
dangling.
|
|
+
|
|
Note that users fetching over dumb protocols will have to fetch the
|
|
whole new pack in order to get any contained object, no matter how many
|
|
other objects in that pack they already have locally.
|
|
|
|
-A::
|
|
Same as `-a`, unless '-d' is used. Then any unreachable
|
|
objects in a previous pack become loose, unpacked objects,
|
|
instead of being left in the old pack. Unreachable objects
|
|
are never intentionally added to a pack, even when repacking.
|
|
This option prevents unreachable objects from being immediately
|
|
deleted by way of being left in the old pack and then
|
|
removed. Instead, the loose unreachable objects
|
|
will be pruned according to normal expiry rules
|
|
with the next 'git gc' invocation. See linkgit:git-gc[1].
|
|
|
|
-d::
|
|
After packing, if the newly created packs make some
|
|
existing packs redundant, remove the redundant packs.
|
|
Also run 'git prune-packed' to remove redundant
|
|
loose object files.
|
|
|
|
-l::
|
|
Pass the `--local` option to 'git pack-objects'. See
|
|
linkgit:git-pack-objects[1].
|
|
|
|
-f::
|
|
Pass the `--no-reuse-delta` option to `git-pack-objects`, see
|
|
linkgit:git-pack-objects[1].
|
|
|
|
-F::
|
|
Pass the `--no-reuse-object` option to `git-pack-objects`, see
|
|
linkgit:git-pack-objects[1].
|
|
|
|
-q::
|
|
Pass the `-q` option to 'git pack-objects'. See
|
|
linkgit:git-pack-objects[1].
|
|
|
|
-n::
|
|
Do not update the server information with
|
|
'git update-server-info'. This option skips
|
|
updating local catalog files needed to publish
|
|
this repository (or a direct copy of it)
|
|
over HTTP or FTP. See linkgit:git-update-server-info[1].
|
|
|
|
--window=<n>::
|
|
--depth=<n>::
|
|
These two options affect how the objects contained in the pack are
|
|
stored using delta compression. The objects are first internally
|
|
sorted by type, size and optionally names and compared against the
|
|
other objects within `--window` to see if using delta compression saves
|
|
space. `--depth` limits the maximum delta depth; making it too deep
|
|
affects the performance on the unpacker side, because delta data needs
|
|
to be applied that many times to get to the necessary object.
|
|
The default value for --window is 10 and --depth is 50.
|
|
|
|
--window-memory=<n>::
|
|
This option provides an additional limit on top of `--window`;
|
|
the window size will dynamically scale down so as to not take
|
|
up more than '<n>' bytes in memory. This is useful in
|
|
repositories with a mix of large and small objects to not run
|
|
out of memory with a large window, but still be able to take
|
|
advantage of the large window for the smaller objects. The
|
|
size can be suffixed with "k", "m", or "g".
|
|
`--window-memory=0` makes memory usage unlimited, which is the
|
|
default.
|
|
|
|
--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.
|
|
The default is unlimited, unless the config variable
|
|
`pack.packSizeLimit` is set.
|
|
|
|
-b::
|
|
--write-bitmap-index::
|
|
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`.
|
|
|
|
--pack-kept-objects::
|
|
Include objects in `.keep` files when repacking. Note that we
|
|
still do not delete `.keep` packs after `pack-objects` finishes.
|
|
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
|
|
bitmapped packfile has the necessary objects.
|
|
|
|
Configuration
|
|
-------------
|
|
|
|
By default, the command passes `--delta-base-offset` option to
|
|
'git pack-objects'; this typically results in slightly smaller packs,
|
|
but the generated packs are incompatible with versions of Git older than
|
|
version 1.4.4. If you need to share your repository with such ancient Git
|
|
versions, either directly or via the dumb http protocol, then you
|
|
need to set the configuration variable `repack.UseDeltaBaseOffset` to
|
|
"false" and repack. Access from old Git versions over the native protocol
|
|
is unaffected by this option as the conversion is performed on the fly
|
|
as needed in that case.
|
|
|
|
SEE ALSO
|
|
--------
|
|
linkgit:git-pack-objects[1]
|
|
linkgit:git-prune-packed[1]
|
|
|
|
GIT
|
|
---
|
|
Part of the linkgit:git[1] suite
|