[PATCH] Add a --signoff option to cherry-pick/revert.

@@ -39,6 +39,9 @@ OPTIONS
 	development branch), adding this information can be
 	useful.
 
+-s|--signoff::
+	Add Signed-off-by line at the end of the commit message.
+
 -r::
 	It used to be that the command defaulted to do `-x`
 	described above, and `-r` was to disable it.  Now the

@@ -27,6 +27,9 @@ OPTIONS
 	message prior to committing the revert. This is the default if
 	you run the command from a terminal.
 
+-s|--signoff::
+	Add Signed-off-by line at the end of the commit message.
+
 -m parent-number|--mainline parent-number::
 	Usually you cannot revert a merge because you do not know which
 	side of the merge should be considered the mainline.  This

@@ -33,7 +33,7 @@ static const char * const cherry_pick_usage[] = {
 	NULL
 };
 
-static int edit, no_replay, no_commit, mainline;
+static int edit, no_replay, no_commit, mainline, signoff;
 static enum { REVERT, CHERRY_PICK } action;
 static struct commit *commit;
 

@@ -53,6 +53,7 @@ static void parse_args(int argc, const char **argv)
 		OPT_BOOLEAN('e', "edit", &edit, "edit the commit message"),
 		OPT_BOOLEAN('x', NULL, &no_replay, "append commit name when cherry-picking"),
 		OPT_BOOLEAN('r', NULL, &noop, "no-op (backward compatibility)"),
+		OPT_BOOLEAN('s', "signoff", &signoff, "add Signed-off-by:"),
 		OPT_INTEGER('m', "mainline", &mainline, "parent number"),
 		OPT_END(),
 	};

@@ -404,10 +405,24 @@ static int revert_or_cherry_pick(int argc, const char **argv)
 	 */
 
 	if (!no_commit) {
-		if (edit)
-			return execl_git_cmd("commit", "-n", NULL);
-		else
-			return execl_git_cmd("commit", "-n", "-F", defmsg, NULL);
+		const char *args[6];
+		int i = 0;
+
+		args[i++] = "commit";
+		args[i++] = "-n";
+
+		if (!edit) {
+			args[i++] = "-F";
+			args[i++] = defmsg;
+		}
+
+		if (signoff) {
+			args[i++] = "-s";
+		}
+
+		args[i] = NULL;
+
+		return execv_git_cmd(args);
 	}
 	free(reencoded_message);
 

@@ -50,6 +50,25 @@ test_expect_success 'cherry-pick after renaming branch' '
 
 '
 
+test_expect_success 'cherry-pick signoff' '
+
+	git checkout rename2 &&
+	git cherry-pick -s added &&
+	test -f opos &&
+	git cat-file commit HEAD | sed "1,/^$/d" > output &&
+	grep Signed-off-by output
+'
+
+test_expect_success 'revert signoff' '
+
+	git checkout rename1 &&
+	git revert -s added &&
+	test -f spoo &&
+	git cat-file commit HEAD | sed "1,/^$/d" > output &&
+	grep Signed-off-by output
+
+'
+
 test_expect_success 'revert after renaming branch' '
 
 	git checkout rename1 &&