Hello,

Consider I want to rewrite a commit that is a merge of a signed tag. In
my case that's 064ca93f7ab927c2752d86fc5727716e340d737c that currently
sits in linux-next:

        ~/gsrc/linux$ git version
        git version 2.6.1
        ~/gsrc/linux$ git checkout 064ca93f7ab927c2752d86fc5727716e340d737c
        ~/gsrc/linux$ git cat-file commit HEAD
        tree 7086bbd51d06ebd0e3fcca70380d0a066efce6ef
        parent e44a01fa0e0aec2f3a21dadb9c030d14831d4258
        parent f719a0d6a8541b383c506aaa4b4fa6b4109669f4
        author Arnd Bergmann <a...@arndb.de> 1444139956 +0200
        committer Arnd Bergmann <a...@arndb.de> 1444139956 +0200
        mergetag object f719a0d6a8541b383c506aaa4b4fa6b4109669f4
         type commit
         tag efm32-for-4.4-rc1
         tagger Uwe Kleine-König <u...@kleine-koenig.org> 1443549594 +0200
         
         efm32 cleanups for 4.4-rc1
         
         These are just two followup cleanups for commits that are in v3.17-rc1 
and
         waited in my private tree for application since that time.
         -----BEGIN PGP SIGNATURE-----
         
         iQEcBAABCgAGBQJWCtIwAAoJEMH8FHityuwJFPYH/2LJpi0yUhI01s0D9U5rZgjl
         8mLP70utAMaqXiGqP/O0ndH+za5TrrUTwDJE5jhAHru1Q6q62Ld2BfOR5+K8zlrP
         4UDGBDj3ePJgEtbSsJYJIRT+AKque2GONbeGpJh2arPrNamWChKIz8HoGSgwdRlx
         TvQuVFEa6C3ujP0ATM8x54f0vR4bYm9WmBS522DwZQY4JpGZC005A3Quw6fmFxPJ
         vJRo1fE1d2OZ3Cuxb15m8PLtZw6sbMdMwgyirAFGrJsN9u/V6BzsSzH0s8suT7IP
         WIohnmYtFSUfkQjaGrMl2wIpJSsIzettiXf9GrQDXSGZsQ4k7sW3U+qrcZ7ZUR4=
         =ngv1
         -----END PGP SIGNATURE-----

        Merge tag 'efm32-for-4.4-rc1' of git://git.pengutronix.de/git/ukl/linux 
into next/cleanup

        Merge "efm32 cleanups for 4.4-rc1" from Uwe Kleine-Koenig:

        These are just two followup cleanups for commits that are in v3.17-rc1 
and
        waited in my private tree for application since that time.

        * tag 'efm32-for-4.4-rc1' of git://git.pengutronix.de/git/ukl/linux:
          ARM: efm32: switch to vendor,device compatible strings
          ARM: efm32: switch to properly namespaced location property

OK, to fix my name in the commit log I do:

         git filter-branch -f --msg-filter "sed 's/Kleine-Koenig/$(echo 
Kleine-K+APY-nig | iconv -f utf-7 -t utf-8)/'" HEAD ^HEAD^ ^HEAD^2

This destroys the mergetag, as now I have:

        ~/gsrc/linux$ git cat-file commit HEAD
        tree 7086bbd51d06ebd0e3fcca70380d0a066efce6ef
        parent e44a01fa0e0aec2f3a21dadb9c030d14831d4258
        parent f719a0d6a8541b383c506aaa4b4fa6b4109669f4
        author Arnd Bergmann <a...@arndb.de> 1444139956 +0200
        committer Arnd Bergmann <a...@arndb.de> 1444139956 +0200

         efm32 cleanups for 4.4-rc1
         
         These are just two followup cleanups for commits that are in v3.17-rc1 
and
         waited in my private tree for application since that time.
         -----BEGIN PGP SIGNATURE-----
         
         iQEcBAABCgAGBQJWCtIwAAoJEMH8FHityuwJFPYH/2LJpi0yUhI01s0D9U5rZgjl
         8mLP70utAMaqXiGqP/O0ndH+za5TrrUTwDJE5jhAHru1Q6q62Ld2BfOR5+K8zlrP
         4UDGBDj3ePJgEtbSsJYJIRT+AKque2GONbeGpJh2arPrNamWChKIz8HoGSgwdRlx
         TvQuVFEa6C3ujP0ATM8x54f0vR4bYm9WmBS522DwZQY4JpGZC005A3Quw6fmFxPJ
         vJRo1fE1d2OZ3Cuxb15m8PLtZw6sbMdMwgyirAFGrJsN9u/V6BzsSzH0s8suT7IP
         WIohnmYtFSUfkQjaGrMl2wIpJSsIzettiXf9GrQDXSGZsQ4k7sW3U+qrcZ7ZUR4=
         =ngv1
         -----END PGP SIGNATURE-----

        Merge tag 'efm32-for-4.4-rc1' of git://git.pengutronix.de/git/ukl/linux 
into next/cleanup

        Merge "efm32 cleanups for 4.4-rc1" from Uwe Kleine-König:

        These are just two followup cleanups for commits that are in v3.17-rc1 
and
        waited in my private tree for application since that time.

        * tag 'efm32-for-4.4-rc1' of git://git.pengutronix.de/git/ukl/linux:
          ARM: efm32: switch to vendor,device compatible strings
          ARM: efm32: switch to properly namespaced location property

        ~/gsrc/linux$ diff -u <(git cat-file commit HEAD) <(git cat-file commit 
064ca93f7ab927c2752d86fc5727716e340d737c)
        --- /dev/fd/63  2015-11-02 09:02:17.310373539 +0100
        +++ /dev/fd/62  2015-11-02 09:02:17.310373539 +0100
        @@ -3,7 +3,11 @@
         parent f719a0d6a8541b383c506aaa4b4fa6b4109669f4
         author Arnd Bergmann <a...@arndb.de> 1444139956 +0200
         committer Arnd Bergmann <a...@arndb.de> 1444139956 +0200
        -
        +mergetag object f719a0d6a8541b383c506aaa4b4fa6b4109669f4
        + type commit
        + tag efm32-for-4.4-rc1
        + tagger Uwe Kleine-König <u...@kleine-koenig.org> 1443549594 +0200
        + 
          efm32 cleanups for 4.4-rc1
          
          These are just two followup cleanups for commits that are in 
v3.17-rc1 and
        @@ -21,7 +25,7 @@
         
         Merge tag 'efm32-for-4.4-rc1' of 
git://git.pengutronix.de/git/ukl/linux into next/cleanup
         
        -Merge "efm32 cleanups for 4.4-rc1" from Uwe Kleine-König:
        +Merge "efm32 cleanups for 4.4-rc1" from Uwe Kleine-Koenig:
         
         These are just two followup cleanups for commits that are in v3.17-rc1 
and
         waited in my private tree for application since that time.

So now the PGP-Signature also appears in the regular commit log. So
either remove the mergetag info completely or (preferably) keep it
completely if the merged parent didn't change.

Best regards
Uwe

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