This was added back in 7e52f56 (gc: do not explode objects
which will be immediately pruned, 2012-04-07), but not
documented at the time, since it was an internal detail
between git-gc and git-repack. However, as people with
complicated setups may want to effectively reimplement the
steps of git-gc themselves, it is nice for us to document
these interfaces.

Signed-off-by: Jeff King <p...@peff.net>
---
 Documentation/git-repack.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/git-repack.txt b/Documentation/git-repack.txt
index b9c02ce..cde7b44 100644
--- a/Documentation/git-repack.txt
+++ b/Documentation/git-repack.txt
@@ -128,6 +128,12 @@ other objects in that pack they already have locally.
        with `-b` or `repack.writeBitmaps`, as it ensures that the
        bitmapped packfile has the necessary objects.
 
+--unpack-unreachable=<when>::
+       When loosening unreachable objects, do not bother loosening any
+       objects older than `<when>`. This can be used to optimize out
+       the write of any objects that would be immediately pruned by
+       a follow-up `git prune`.
+
 Configuration
 -------------
 
-- 
2.9.0.rc2.149.gd580ccd

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