rev/path disambiguation: further restrict "misspelled index entry" diag

A colon followed by anything !isalnum() (e.g. ":/heh") at this point is
known not to be an existing rev.  Just give a generic "neither a rev nor
a path" error message.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/setup.c b/setup.c
index 7fde4fa..fd4ce59 100644 (file)
--- a/setup.c
+++ b/setup.c
@@ -85,8 +85,17 @@ 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, 1, prefix);
+
+       /*
+        * Saying "'(icase)foo' does not exist in the index" when the
+        * user gave us ":(icase)foo" is just stupid.  A magic pathspec
+        * begins with a colon and is followed by a non-alnum; do not
+        * let get_sha1_with_mode_1(only_to_die=1) to even trigger.
+        */
+       if (!(arg[0] == ':' && !isalnum(arg[1])))
+               /* try a detailed diagnostic ... */
+               get_sha1_with_mode_1(arg, sha1, &mode, 1, 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);