[PATCH 3/4] add_packed_ref(): new function in the refs API.

[mhagger@alum.mit.edu]

From: Michael Haggerty <mhagger@alum.mit.edu>

Add a new function add_packed_ref() that adds a reference directly to
the in-memory packed reference cache.  This will be useful for
creating local references while cloning.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
---
This new function call only stores the new reference to the in-memory
cache.  The user has to remember to call pack_refs() to actually write
the new reference(s) to the packed-refs file.  (I don't think it is
practical to make the write happen automatically.)

 refs.c |    6 ++++++
 refs.h |    6 ++++++
 2 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/refs.c b/refs.c
index 268816f..14f764d 100644
--- a/refs.c
+++ b/refs.c
@@ -319,6 +319,12 @@ static struct ref_array *get_packed_refs(struct ref_cache *refs)
 	return &refs->packed;
 }
 
+void add_packed_ref(const char *refname, const unsigned char *sha1)
+{
+	add_ref(get_packed_refs(get_ref_cache(NULL)),
+			create_ref_entry(refname, sha1, REF_ISPACKED, 1));
+}
+
 static void get_ref_dir(struct ref_cache *refs, const char *base,
 			struct ref_array *array)
 {
diff --git a/refs.h b/refs.h
index d498291..00ba1e2 100644
--- a/refs.h
+++ b/refs.h
@@ -51,6 +51,12 @@ extern int for_each_rawref(each_ref_fn, void *);
 extern void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname);
 
 /*
+ * Add a reference to the in-memory packed reference cache.  To actually
+ * write the reference to the packed-refs file, call pack_refs().
+ */
+extern void add_packed_ref(const char *refname, const unsigned char *sha1);
+
+/*
  * Extra refs will be listed by for_each_ref() before any actual refs
  * for the duration of this process or until clear_extra_refs() is
  * called. Only extra refs added before for_each_ref() is called will
-- 
1.7.8.3