[PATCH v5 31/44] builtin-am: implement -S/--gpg-sign, commit.gpgsign

[Paul Tan <pyokagan@gmail.com>]

Since 3b4e395 (am: add the --gpg-sign option, 2014-02-01), git-am.sh
supported the --gpg-sign option, and would pass it to git-commit-tree,
thus GPG-signing the commit object.

Re-implement this option in builtin/am.c.

git-commit-tree would also sign the commit by default if the
commit.gpgsign setting is true. Since we do not run commit-tree, we
re-implement this behavior by handling the commit.gpgsign setting
ourselves.

Helped-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
---

Notes:
    v5
    
    * Renamed local "sign_commit" variable in am_state_init() to "gpgsign"
      to aid code review.

 builtin/am.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/builtin/am.c b/builtin/am.c
index d7bb159..81b3e31 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -124,6 +124,8 @@ struct am_state {
 
 	int ignore_date;
 
+	const char *sign_commit;
+
 	int rebasing;
 };
 
@@ -133,6 +135,8 @@ struct am_state {
  */
 static void am_state_init(struct am_state *state, const char *dir)
 {
+	int gpgsign;
+
 	memset(state, 0, sizeof(*state));
 
 	assert(dir);
@@ -149,6 +153,9 @@ static void am_state_init(struct am_state *state, const char *dir)
 	state->scissors = SCISSORS_UNSET;
 
 	argv_array_init(&state->git_apply_opts);
+
+	if (!git_config_get_bool("commit.gpgsign", &gpgsign))
+		state->sign_commit = gpgsign ? "" : NULL;
 }
 
 /**
@@ -1266,7 +1273,7 @@ static void do_commit(const struct am_state *state)
 			state->ignore_date ? "" : state->author_date, 1);
 
 	if (commit_tree(state->msg, state->msg_len, tree, parents, commit,
-				author, NULL))
+				author, state->sign_commit))
 		die(_("failed to write commit object"));
 
 	reflog_msg = getenv("GIT_REFLOG_ACTION");
@@ -1688,6 +1695,9 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 			N_("lie about committer date")),
 		OPT_BOOL(0, "ignore-date", &state.ignore_date,
 			N_("use current timestamp for author date")),
+		{ OPTION_STRING, 'S', "gpg-sign", &state.sign_commit, N_("key-id"),
+		  N_("GPG-sign commits"),
+		  PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
 		OPT_HIDDEN_BOOL(0, "rebasing", &state.rebasing,
 			N_("(internal use for git-rebase)")),
 		OPT_END()
-- 
2.5.0.rc1.76.gf60a929