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gc: automatically write commit-graph files

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The commit-graph file is a very helpful feature for speeding up git
operations. In order to make it more useful, make it possible to
write the commit-graph file during standard garbage collection
operations.

Add a 'gc.commitGraph' config setting that triggers writing a
commit-graph file after any non-trivial 'git gc' command. Defaults to
false while the commit-graph feature matures. We specifically do not
want to have this on by default until the commit-graph feature is fully
integrated with history-modifying features like shallow clones.

Helped-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee
2018-06-27 09:24:46 -04:00
committed by Junio C Hamano
parent 59fb87701f
commit d5d5d7b641
4 changed files with 30 additions and 3 deletions
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14
t/t5318-commit-graph.sh
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@ -245,6 +245,20 @@ test_expect_success 'perform fast-forward merge in full repo' '
test_cmp expect output
'
test_expect_success 'check that gc computes commit-graph' '
cd "$TRASH_DIRECTORY/full" &&
git commit --allow-empty -m "blank" &&
git commit-graph write --reachable &&
cp $objdir/info/commit-graph commit-graph-before-gc &&
git reset --hard HEAD~1 &&
git config gc.writeCommitGraph true &&
git gc &&
cp $objdir/info/commit-graph commit-graph-after-gc &&
! test_cmp commit-graph-before-gc commit-graph-after-gc &&
git commit-graph write --reachable &&
test_cmp commit-graph-after-gc $objdir/info/commit-graph
'
# the verify tests below expect the commit-graph to contain
# exactly the commits reachable from the commits/8 branch.
# If the file changes the set of commits in the list, then the