builtin/show-branch: rewrite functions to work with object_id

diff --git a/cache.h b/cache.h
index c97d8071e14c1a9c41c39873450ca0d17565daa9..1f4226be1580e368b22d62a6e27aa55d37a4dbd7 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -1541,9 +1541,13 @@ extern const char *git_mailmap_blob;
 extern void maybe_flush_or_die(FILE *, const char *);
 __attribute__((format (printf, 2, 3)))
 extern void fprintf_or_die(FILE *, const char *fmt, ...);
+
+#define COPY_READ_ERROR (-2)
+#define COPY_WRITE_ERROR (-3)
 extern int copy_fd(int ifd, int ofd);
 extern int copy_file(const char *dst, const char *src, int mode);
 extern int copy_file_with_time(const char *dst, const char *src, int mode);
+
 extern void write_or_die(int fd, const void *buf, size_t count);
 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);