Add git-symbolic-ref

This adds the counterpart of git-update-ref that lets you read
and create "symbolic refs".  By default it uses a symbolic link
to represent ".git/HEAD -> refs/heads/master", but it can be compiled
to use the textfile symbolic ref.

The places that did 'readlink .git/HEAD' and 'ln -s refs/heads/blah
.git/HEAD' have been converted to use new git-symbolic-ref command, so
that they can deal with either implementation.

Signed-off-by: Junio C Hamano <junio@twinsun.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/cache.h b/cache.h
index 63823c3529..ec2a1610b2 100644
--- a/cache.h
+++ b/cache.h
@@ -231,6 +231,8 @@ 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);
 extern const char *resolve_ref(const char *path, unsigned char *sha1, int);
+extern int create_symref(const char *git_HEAD, const char *refs_heads_master);
+extern int validate_symref(const char *git_HEAD);
 
 /* General helper functions */
 extern void usage(const char *err) NORETURN;