Hello,

I just noticed that git-filter-branch doesn't preserve mergetag
annotations in situations where it could. Here is an example (with
linux.git):

        $ git checkout -b test 6cd2f85413eef8fe7bcd7c25bf55e7b055fa257c
        $ git cat-file commit HEAD | grep mergetag
        mergetag object 954263938706bf62d36e81b6b49f313390f2ed35
        $ git filter-branch -f --msg-filter 'sed s/foo/bar/' HEAD^!
        Rewrite 6cd2f85413eef8fe7bcd7c25bf55e7b055fa257c (1/1)
        Ref 'refs/heads/test' was rewritten
        $ diff -u <(git cat-file commit refs/original/refs/heads/test) <(git 
cat-file commit HEAD)
        --- /dev/fd/63  2014-09-23 21:07:49.987065017 +0200
        +++ /dev/fd/62  2014-09-23 21:07:49.991064988 +0200
        @@ -3,32 +3,6 @@
         parent 954263938706bf62d36e81b6b49f313390f2ed35
         author Linus Torvalds <torva...@linux-foundation.org> 1411488823 -0700
         committer Linus Torvalds <torva...@linux-foundation.org> 1411488823 
-0700
        -mergetag object 954263938706bf62d36e81b6b49f313390f2ed35
        - type commit
        - tag for-linus
        - tagger Paolo Bonzini <pbonz...@redhat.com> 1411478481 +0200
        - 
        - Another fix for 3.17 arrived at just the wrong time, after I had sent
        - yesterday's pull request.  Normally I would have waited for
        - some other patches to pile up, but since 3.17 might be short
        - here it is.
        - -----BEGIN PGP SIGNATURE-----
        - Version: GnuPG v2.0.22 (GNU/Linux)
        - 
        - iQIcBAABAgAGBQJUIXPRAAoJEBvWZb6bTYbyySEP/AkPjfNGYqwBbM8GUJ4tt4gR
        - C+xbiO+xPr2qCwfi36DQtL0UPwJHWSq7SXaDMvSqMo22FjnFcVaGuQcGAPno/8ZA
        - tLBe1km9HIPlEIV3vpoe8PPpj9cuZ86+YOCuPIqK5fC7l6Ops0dhCOjf88tmPVQ4
        - yhodpJ1Lt/sPBUWb6pNfk0iWD+qSbfUWtwzv89oudEvLcLiAcPSBdbvnxVS3bmGm
        - qbL8pvCOozK5GJbl0+cYWCoEPBP5ekqGvwvGdEBTx+4qv2S2htzUX30UA2VYy5IR
        - jMXVrJbvSW9FXQdBgr0Q4ql6evOVjL+5LpwgRUC6tuC6r1rMP+nXyHKS35HC1i8W
        - FYr62B/LZTm4vyDHsmsiEl43VLAcF7kmXufQT62vJg+ifeA1MAMIJra7ZDx8WbsD
        - HDqM+CeaZrF3p4okRrktbecQdeFFyg4wOasHRTO7SETkbP7i1cS0Mp8rRbX3CnJq
        - 0UM8STe+hViXR7uYZEbjlbGKkszDS49fstJIaNm9JPJm+S/V5/MZFelNWgPp/+kF
        - xpQUxtoSaFnqgBXpRZ7t2Y2zGeZkMWn/P84S23/7K1TfRPCsUpgFbiY26rGW9l4v
        - r8gz7v+V1gCzWYVRuEzolFrea6A1ik2sspzeDuZOrf+QYwMyyUdEQ/NfCm032wba
        - CYL0V2M/dJNmZnZRPP9/
        - =ZkSE
        - -----END PGP SIGNATURE-----
         
         Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
         
I expected the signature to not disappear such that in the example above
no change is introduced.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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