git diff too slow for a file

diff --git a/setup.c b/setup.c
index 7fc42517136955f7748855818999eaaeec9160bf..fac34f77a7800193e636f49c799908f629540de1 100644 (file)
--- a/setup.c
+++ b/setup.c
@@ -77,6 +77,18 @@ int check_filename(const char *prefix, const char *arg)
        die_errno("failed to stat '%s'", arg);
 }
 
+static void NORETURN die_verify_filename(const char *prefix, const char *arg)
+{
+       unsigned char sha1[20];
+       unsigned mode;
+       /* try a detailed diagnostic ... */
+       get_sha1_with_mode_1(arg, sha1, &mode, 0, prefix);
+       /* ... or fall back the most general message. */
+       die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
+           "Use '--' to separate paths from revisions", arg);
+
+}
+
 /*
  * Verify a filename that we got as an argument for a pathspec
  * entry. Note that a filename that begins with "-" never verifies
@@ -90,8 +102,7 @@ void verify_filename(const char *prefix, const char *arg)
                die("bad flag '%s' used after filename", arg);
        if (check_filename(prefix, arg))
                return;
-       die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
-           "Use '--' to separate paths from revisions", arg);
+       die_verify_filename(prefix, arg);
 }
 
 /*
@@ -195,7 +206,7 @@ int is_inside_work_tree(void)
 }
 
 /*
- * set_work_tree() is only ever called if you set GIT_DIR explicitely.
+ * set_work_tree() is only ever called if you set GIT_DIR explicitly.
  * The old behaviour (which we retain here) is to set the work tree root
  * to the cwd, unless overridden by the config, the command line, or
  * GIT_WORK_TREE.