gpg: export git-gpg wrapper

should be used as 'gpg.program' in .git/config

setup.py

@@ -31,5 +31,6 @@ setup(
         'trezor-agent = trezor_agent.__main__:run_agent',
         'trezor-git = trezor_agent.__main__:run_git',
         'trezor-gpg = trezor_agent.gpg.signer:main',
+        'trezor-git-gpg-wrapper = trezor_agent.gpg.git_wrapper:main',
     ]},
 )

trezor_agent/gpg/git_wrapper.py

@@ -17,9 +17,11 @@ def main():
     if '--verify' in args:
         return sp.call(['gpg2'] + args)
     else:
-        command, user_id = args
+        command = args[0]
+        user_id = ' '.join(args[1:])
         assert command == '-bsau'  # --detach-sign --sign --armor --local-user
-        s = signer.load_from_gpg(user_id)
+        pubkey = signer.load_from_gpg(user_id)
+        s = signer.Signer.from_public_key(user_id=user_id, pubkey=pubkey)
 
         data = sys.stdin.read()
         sig = s.sign(data)