Error when searching for a bogus range

[john at keeping.me.uk (John Keeping)]

On Tue, Jun 10, 2014 at 02:05:14PM -0400, Konstantin Ryabitsev wrote:
> cgit-0.10.1-1.el6 (EPEL version)
> 
> If you search for a bogus range string here:
> 
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/
> 
> Using something like "range" and "qwerty123456", it returns an "Internal
> Server Error" and the following in the logs:
> 
> > [Tue Jun 10 17:45:32 2014] [error] [client 172.21.1.6] fatal: ambiguous argument 'qwerty123456': unknown revision or path not in the working tree., referer: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/
> > [Tue Jun 10 17:45:32 2014] [error] [client 172.21.1.6] Use '--' to separate paths from revisions, like this:, referer: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/
> > [Tue Jun 10 17:45:32 2014] [error] [client 172.21.1.6] 'git <command> [<revision>...] -- [<file>...]', referer: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/
> > [Tue Jun 10 17:45:32 2014] [error] [client 172.21.1.6] Premature end of script headers: cgit, referer: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/

This is because we just pass the arguments straight to Git's revision
parsing machinery which die()s if it cannot parse an argument, printing
the above to stderr and exiting.

The patch below makes it a bit friendlier by just ignoring unhandled
arguments, but I can't see an easy way to report errors when we can't
parse revision arguments without losing the flexibility of supporting
all of the revision specifiers supported by Git.

-- >8 --
diff --git a/ui-log.c b/ui-log.c
index 499534c..4cb26bc 100644
--- a/ui-log.c
+++ b/ui-log.c
@@ -337,16 +337,16 @@ void cgit_print_log(const char *tip, int ofs, int cnt, char *grep, char *pattern
 	else if (commit_sort == 2)
 		argv_array_push(&rev_argv, "--topo-order");
 
-	if (path) {
-		argv_array_push(&rev_argv, "--");
+	argv_array_push(&rev_argv, "--");
+	if (path)
 		argv_array_push(&rev_argv, path);
-	}
 
 	init_revisions(&rev, NULL);
 	rev.abbrev = DEFAULT_ABBREV;
 	rev.commit_format = CMIT_FMT_DEFAULT;
 	rev.verbose_header = 1;
 	rev.show_root_diff = 0;
+	rev.ignore_missing = 1;
 	setup_revisions(rev_argv.argc, rev_argv.argv, &rev, NULL);
 	load_ref_decorations(DECORATE_FULL_REFS);
 	rev.show_decorations = 1;