[PATCH 02/18] builtin rebase: support --signoff

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This commit adds support for `--signoff` which is used to add a
`Signed-off-by` trailer to all the rebased commits. The actual
handling is left to the rebase backends.

Signed-off-by: Pratik Karki <predatoramigo@xxxxxxxxx>
---
 builtin/rebase.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/builtin/rebase.c b/builtin/rebase.c
index fc9b5a8a60..a491481120 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -93,6 +93,7 @@ struct rebase_options {
 	} flags;
 	struct strbuf git_am_opt;
 	const char *action;
+	int signoff;
 };
 
 static int is_interactive(struct rebase_options *opts)
@@ -168,6 +169,11 @@ static int read_basic_state(struct rebase_options *opts)
 	if (file_exists(state_dir_path("verbose", opts)))
 		opts->flags |= REBASE_VERBOSE;
 
+	if (file_exists(state_dir_path("signoff", opts))) {
+		opts->signoff = 1;
+		opts->flags |= REBASE_FORCE;
+	}
+
 	strbuf_release(&buf);
 
 	return 0;
@@ -249,6 +255,7 @@ static int run_specific_rebase(struct rebase_options *opts)
 	if (opts->switch_to)
 		add_var(&script_snippet, "switch_to", opts->switch_to);
 	add_var(&script_snippet, "action", opts->action ? opts->action : "");
+	add_var(&script_snippet, "signoff", opts->signoff ? "--signoff" : "");
 
 	switch (opts->type) {
 	case REBASE_AM:
@@ -513,6 +520,8 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 		{OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
 			N_("do not show diffstat of what changed upstream"),
 			PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
+		OPT_BOOL(0, "signoff", &options.signoff,
+			 N_("add a Signed-off-by: line to each commit")),
 		OPT_BIT('f', "force-rebase", &options.flags,
 			N_("cherry-pick all commits, even if unchanged"),
 			REBASE_FORCE),
@@ -745,6 +754,14 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 		break;
 	}
 
+	if (options.signoff) {
+		if (options.type == REBASE_PRESERVE_MERGES)
+			die("cannot combine '--signoff' with "
+			    "'--preserve-merges'");
+		strbuf_addstr(&options.git_am_opt, " --signoff");
+		options.flags |= REBASE_FORCE;
+	}
+
 	if (!options.root) {
 		if (argc < 1)
 			die("TODO: handle @{upstream}");
-- 
2.18.0




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