Document git reflog --stale-fix

Document --stale-fix, used in "git reflog expire --stale-fix --all"
to remove invalid reflog entries, to fix situation after running
non reflog-aware git-prune from an older git in the presence of
reflogs (see RelNotes-1.5.0.txt).

Based on description of commit 1389d9ddaa68a4cbf5018d88f971b9bbb7aaa3c9
  "reflog expire --fix-stale"
which introduced this option.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-reflog.txt b/Documentation/git-reflog.txt
index f717e1e..89bc9c5 100644 (file)
--- a/Documentation/git-reflog.txt
+++ b/Documentation/git-reflog.txt
@@ -39,6 +39,19 @@ the current branch. It is basically an alias for 'git log -g --abbrev-commit
 OPTIONS
 -------
 
+--stale-fix::
+       This revamps the logic -- the definition of "broken commit"
+       becomes: a commit that is not reachable from any of the refs and
+       there is a missing object among the commit, tree, or blob
+       objects reachable from it that is not reachable from any of the
+       refs.
++
+This computation involves traversing all the reachable objects, i.e. it
+has the same cost as 'git prune'.  Fortunately, once this is run, we
+should not have to ever worry about missing objects, because the current
+prune and pack-objects know about reflogs and protect objects referred by
+them.
+
 --expire=<time>::
        Entries older than this time are pruned.  Without the
        option it is taken from configuration `gc.reflogExpire`,