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gc doc: mention the commit-graph in the intro 

Explicitly mention in the intro that we may be writing supplemental
data structures such as the commit-graph during "gc", i.e. to call out
the "optimize" part of what this command does, it doesn't just
"collect garbage" as the "gc" name might imply.

Past changes have updated the intro to reflect new commands, such as
mentioning "worktree" in b586a96a39 ("gc.txt: more details about what
gc does", 2018-03-15). So let's elaborate on what was added in
d5d5d7b641 ("gc: automatically write commit-graph files", 2018-06-27).

See also
https://public-inbox.org/git/87tvm3go42.fsf@evledraar.gmail.com/ (follow-up
replies) for an on-list discussion about what "gc" does.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ævar Arnfjörð Bjarmason 2018-10-10 19:38:18 +00:00 committed by Junio C Hamano
parent 5a0cc8aca7
commit c7e8ce6d1d
1 changed files with 2 additions and 1 deletions
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Documentation/git-gc.txt
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@ -17,7 +17,8 @@ Runs a number of housekeeping tasks within the current repository,
such as compressing file revisions (to reduce disk space and increase
performance), removing unreachable objects which may have been
created from prior invocations of 'git add', packing refs, pruning
reflog, rerere metadata or stale working trees.
reflog, rerere metadata or stale working trees. May also update ancillary
indexes such as the commit-graph.
Users are encouraged to run this task on a regular basis within
each repository to maintain good disk space utilization and good