[PATCH] checkpatch.pl: use correct gitroot when running from non-top-level dir

[Peter Collingbourne <pcc@google.com>]

My workflow usually requires running checkpatch.pl from a subdirectory
of the kernel source tree. This works for the most part, but the script
will be unable to find the .git directory and will therefore refuse to
run any git commands (so, e.g. commit ID verification will fail). Fix
it by prepending $root to $gitroot when a root is set.

This also requires fixing one root directory assumption in a git
invocation.

Signed-off-by: Peter Collingbourne <pcc@google.com>
Link: https://linux-review.googlesource.com/id/I33dc5f38e2bfcd95c8ea59933bba5305cce50404
---
 scripts/checkpatch.pl | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index c27d2312cfc3..171c5993efb4 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -434,6 +434,8 @@ if ($tree) {
 		print "Must be run from the top-level dir. of a kernel tree\n";
 		exit(2);
 	}
+
+	$gitroot = "$root/$gitroot";
 }
 
 my $emitted_corrupt = 0;
@@ -1131,7 +1133,7 @@ sub seed_camelcase_includes {
 	}
 
 	if (-e "$gitroot") {
-		$files = `${git_command} ls-files "include/*.h"`;
+		$files = `${git_command} ls-files "$root/include/*.h"`;
 		@include_files = split('\n', $files);
 	}
 
-- 
2.33.0.309.g3052b89438-goog