path: root/Documentation/git-gc.txt
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authorJunio C Hamano <>2010-04-09 20:20:02 (GMT)
committerJunio C Hamano <>2010-04-18 01:23:19 (GMT)
commit03cb91b18cc7f9c19c053c97711f592cebddb5f4 (patch)
tree0696f3d609022e8a469d4be7a78c0d4b188f2ac9 /Documentation/git-gc.txt
parent713c79e84bb148b8166d866755d155f64b270ac9 (diff)
reflog --expire-unreachable: special case entries in "HEAD" reflog
"git reflog expire" (and "git gc") examines the reflog entries and discards old/stale ones using two criteria. The entries that are older than "reflogexpire" (defaults to 90 days) are unconditionally removed, and the entries that are older than "reflogexpireunreachable" (defaults to 30 days) are removed if the entry point at commits that are not reachable from the value of the ref. This is reasonable for local branches, remote tracking branches and tags. You (or other people) may have failed experiments that have been made and then later discarded by resetting the tip of the branch back, and setting the value of "reflogexpireunreachable" shorter than that of "reflogexpire" will prune the entries that describe these failed experiments earlier than the entries that describe the steps that led to the current history. It however doesn't make much sense for "HEAD" reflog. When you switch between branches, it is normal that the tip of the branch you were on is not an ancestor of the branch you have switched to. The moral equivalent of expiring failed experiments in per-branch reflog for "HEAD" reflog is to expire entries that talk about commits that cannot be reached from any ref. Signed-off-by: Junio C Hamano <>
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