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| author |  Jeff King <peff@peff.net> | 2019-07-01 09:18:15 -0400 |
|---|---|---|
| committer |  Junio C Hamano <gitster@pobox.com> | 2019-07-01 10:11:09 -0700 |
| commit | 39b44ba771a315602fd1fdca2e12dfc31ef9c613 (patch) | |
| tree | 7ed94c7254550b396a8e4895aa1d2e8c1499d263 /Documentation | |
| parent | object-store.h: move for_each_alternate_ref() from transport.h (diff) | |
| download | tgif-39b44ba771a315602fd1fdca2e12dfc31ef9c613.tar.xz | |
check_everything_connected: assume alternate ref tips are valid
When we receive a remote ref update to sha1 "X", we want to check that
we have all of the objects needed by "X". We can assume that our
repository is not currently corrupted, and therefore if we have a ref
pointing at "Y", we have all of its objects. So we can stop our
traversal from "X" as soon as we hit "Y".
If we make the same non-corruption assumption about any repositories we
use to store alternates, then we can also use their ref tips to shorten
the traversal.
This is especially useful when cloning with "--reference", as we
otherwise do not have any local refs to check against, and have to
traverse the whole history, even though the other side may have sent us
few or no objects. Here are results for the included perf test (which
shows off more or less the maximal savings, getting one new commit and
sharing the whole history):
Test HEAD^ HEAD
--------------------------------------------------------------------
[on git.git]
5600.3: clone --reference 2.94(2.86+0.08) 0.09(0.08+0.01) -96.9%
[on linux.git]
5600.3: clone --reference 45.74(45.34+0.41) 0.36(0.30+0.08) -99.2%
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/rev-list-options.txt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/rev-list-options.txt b/Documentation/rev-list-options.txt index 71a1fcc093..90a2c027ea 100644 --- a/Documentation/rev-list-options.txt +++ b/Documentation/rev-list-options.txt @@ -182,6 +182,14 @@ explicitly. Pretend as if all objects mentioned by reflogs are listed on the command line as `<commit>`. +--alternate-refs:: + Pretend as if all objects mentioned as ref tips of alternate + repositories were listed on the command line. An alternate + repository is any repository whose object directory is specified + in `objects/info/alternates`. The set of included objects may + be modified by `core.alternateRefsCommand`, etc. See + linkgit:git-config[1]. + --single-worktree:: By default, all working trees will be examined by the following options when there are more than one (see |