This commit allows git to create and check X509 type signatures using
gpgsm.

Signed-off-by: Henning Schild <henning.sch...@siemens.com>
---
 Documentation/config.txt |  5 ++++-
 gpg-interface.c          | 10 +++++++++-
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index c88903399..337df6e48 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1828,9 +1828,12 @@ gpg.program::
        signed, and the program is expected to send the result to its
        standard output.
 
+gpg.programX509::
+       Just like gpg.program, here the default you override is "`gpgsm`".
+
 gpg.format::
        Specifies which key format to use when signing with `--gpg-sign`.
-       Default is "PGP", that is also the only supported value.
+       Default is "PGP" and another possible value is "X509".
 
 gui.commitMsgWidth::
        Defines how wide the commit message window is in the
diff --git a/gpg-interface.c b/gpg-interface.c
index aa747278e..85d721007 100644
--- a/gpg-interface.c
+++ b/gpg-interface.c
@@ -16,13 +16,18 @@ struct gpg_format_data {
 
 #define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----"
 #define PGP_MESSAGE "-----BEGIN PGP MESSAGE-----"
+#define X509_SIGNATURE "-----BEGIN SIGNED MESSAGE-----"
 
-enum gpgformats { PGP_FMT };
+enum gpgformats { PGP_FMT, X509_FMT };
 struct gpg_format_data gpg_formats[] = {
        { .format = "PGP", .program = "gpg",
          .extra_args_verify = { "--keyid-format=long", },
          .sigs = { PGP_SIGNATURE, PGP_MESSAGE, },
        },
+       { .format = "X509", .program = "gpgsm",
+         .extra_args_verify = { NULL },
+         .sigs = {X509_SIGNATURE, NULL, }
+       },
 };
 static const char *gpg_format = "PGP";
 
@@ -190,6 +195,9 @@ int git_gpg_config(const char *var, const char *value, void 
*cb)
        if (!strcmp(var, "gpg.program"))
                return git_config_string(&gpg_formats[PGP_FMT].program, var,
                                         value);
+       if (!strcmp(var, "gpg.programX509"))
+               return git_config_string(&gpg_formats[X509_FMT].program, var,
+                                        value);
        return 0;
 }
 
-- 
2.16.4

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