[PATCH 3/4] rev-parse: introduce get_sha1_gently

[Jon Seymour <jon.seymour@gmail.com>]

Use of this function allows git rev-parse --verify ref@{n}
to report an error message if n >= the size of the
reference log for ref.

However, if the user has not specified --verify, get_sha1_gently
will be called again via verify_filename and the message will
be reported then, if required.

Signed-off-by: Jon Seymour <jon.seymour@gmail.com>
---
 builtin/rev-parse.c |    2 +-
 cache.h             |    1 +
 sha1_name.c         |    8 ++++++++
 3 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index a5a1c86..dbc6a8c 100644
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -707,7 +707,7 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 			name++;
 			type = REVERSED;
 		}
-		if (!get_sha1(name, sha1)) {
+		if (!get_sha1_gently(name, sha1, !verify)) {
 			if (verify)
 				revs_count++;
 			else
diff --git a/cache.h b/cache.h
index 37ef9d8..625728c 100644
--- a/cache.h
+++ b/cache.h
@@ -767,6 +767,7 @@ static inline int get_sha1_with_context(const char *str, unsigned char *sha1, st
 {
 	return get_sha1_with_context_1(str, sha1, orc, 1, NULL);
 }
+extern inline int get_sha1_gently(const char *str, unsigned char *sha1, int gently);
 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 extern char *sha1_to_hex(const unsigned char *sha1);	/* static buffer result! */
 extern int read_ref(const char *filename, unsigned char *sha1);
diff --git a/sha1_name.c b/sha1_name.c
index 6e706eb..48e7aa0 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -1050,6 +1050,14 @@ int get_sha1_with_mode_1(const char *name, unsigned char *sha1, unsigned *mode,
 	return ret;
 }
 
+int get_sha1_gently(const char *name, unsigned char *sha1, int gently)
+{
+	struct object_context unused;
+	int ret;
+	ret = get_sha1_with_context_1(name, sha1, &unused, gently, NULL);
+	return ret;
+}
+
 int get_sha1_with_context_1(const char *name, unsigned char *sha1,
 			    struct object_context *oc,
 			    int gently, const char *prefix)
-- 
1.7.2.1.156.gf148c