[PATCH v2 4/6] refs: add safe_create_reflog function

[David Turner <dturner@twopensource.com>]

Make log_ref_setup private, and add public safe_create_reflog which
calls log_ref_setup.

In a moment, we will use safe_create_reflog to add reflog creation
commands to git-reflog.

Signed-off-by: David Turner <dturner@twopensource.com>
---
 builtin/checkout.c |  4 +---
 refs.c             | 11 +++++++++++
 refs.h             |  2 +-
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/builtin/checkout.c b/builtin/checkout.c
index 93f63d3..b793670 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -621,7 +621,6 @@ static void update_refs_for_switch(const struct checkout_opts *opts,
 		if (opts->new_orphan_branch) {
 			if (opts->new_branch_log && !log_all_ref_updates) {
 				int temp;
-				struct strbuf log_file = STRBUF_INIT;
 				int ret;
 				const char *ref_name;
 				struct strbuf err = STRBUF_INIT;
@@ -629,9 +628,8 @@ static void update_refs_for_switch(const struct checkout_opts *opts,
 				ref_name = mkpath("refs/heads/%s", opts->new_orphan_branch);
 				temp = log_all_ref_updates;
 				log_all_ref_updates = 1;
-				ret = log_ref_setup(ref_name, &log_file, &err);
+				ret = safe_create_reflog(ref_name, &err);
 				log_all_ref_updates = temp;
-				strbuf_release(&log_file);
 				if (ret) {
 					fprintf(stderr, _("Can not do reflog for '%s'. %s\n"),
 						opts->new_orphan_branch, err.buf);
diff --git a/refs.c b/refs.c
index de7b5ef..7b02c45 100644
--- a/refs.c
+++ b/refs.c
@@ -3171,6 +3171,17 @@ int log_ref_setup(const char *refname, struct strbuf *sb_logfile, struct strbuf
 	return 0;
 }
 
+
+int safe_create_reflog(const char *refname, struct strbuf *err)
+{
+	int ret;
+	struct strbuf sb = STRBUF_INIT;
+
+	ret = log_ref_setup(refname, &sb, err);
+	strbuf_release(&sb);
+	return ret;
+}
+
 static int log_ref_write_fd(int fd, const unsigned char *old_sha1,
 			    const unsigned char *new_sha1,
 			    const char *committer, const char *msg)
diff --git a/refs.h b/refs.h
index debdefc..2986aac 100644
--- a/refs.h
+++ b/refs.h
@@ -228,7 +228,7 @@ int pack_refs(unsigned int flags);
 /*
  * Setup reflog before using. Fill in err and return -1 on failure.
  */
-int log_ref_setup(const char *refname, struct strbuf *logfile, struct strbuf *err);
+int safe_create_reflog(const char *refname, struct strbuf *err);
 
 /** Reads log for the value of ref during at_time. **/
 extern int read_ref_at(const char *refname, unsigned int flags,
-- 
2.0.4.314.gdbf7a51-twtrsrc