Supporting multiple signing formats we will have the need to configure a
custom program each. Add a new config value to cater for that.

Signed-off-by: Henning Schild <henning.sch...@siemens.com>
---
 Documentation/config.txt | 5 +++++
 gpg-interface.c          | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index ac373e3f4..0e871346a 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1832,6 +1832,11 @@ gpg.format::
        Specifies which key format to use when signing with `--gpg-sign`.
        Default is "openpgp", that is also the only supported value.
 
+gpg.<format>.program::
+       Use this to customize the program used for the signing format you
+       chose. (see `gpg.program` and `gpg.format`) `gpg.program` can still
+       be used as a legacy synonym for `gpg.openpgp.program`.
+
 gui.commitMsgWidth::
        Defines how wide the commit message window is in the
        linkgit:git-gui[1]. "75" is the default.
diff --git a/gpg-interface.c b/gpg-interface.c
index 51cad9081..a158f08c1 100644
--- a/gpg-interface.c
+++ b/gpg-interface.c
@@ -189,7 +189,7 @@ int git_gpg_config(const char *var, const char *value, void 
*cb)
                return 0;
        }
 
-       if (!strcmp(var, "gpg.program"))
+       if (!strcmp(var, "gpg.program") || !strcmp(var, "gpg.openpgp.program"))
                fmtname = "openpgp";
 
        if (fmtname) {
-- 
2.16.4

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