1 files changed, 17 insertions, 0 deletions
diff --git a/parse-options.c b/parse-options.c
index 9eb55cc8b5..4c5d09dd25 100644
--- a/parse-options.c
+++ b/parse-options.c
@@ -1,6 +1,7 @@
 #include "git-compat-util.h"
 #include "parse-options.h"
 #include "cache.h"
+#include "commit.h"
 
 #define OPT_SHORT 1
 #define OPT_UNSET 2
@@ -506,6 +507,22 @@ int parse_opt_verbosity_cb(const struct option *opt, const char *arg,
 	return 0;
 }
 
+int parse_opt_with_commit(const struct option *opt, const char *arg, int unset)
+{
+	unsigned char sha1[20];
+	struct commit *commit;
+
+	if (!arg)
+		return -1;
+	if (get_sha1(arg, sha1))
+		return error("malformed object name %s", arg);
+	commit = lookup_commit_reference(sha1);
+	if (!commit)
+		return error("no such commit %s", arg);
+	commit_list_insert(commit, opt->value);
+	return 0;
+}
+
 /*
  * This should really be OPTION_FILENAME type as a part of
  * parse_options that take prefix to do this while parsing.