util/lint/checkpatch.pl: Use "gitroot"

This is to reduce difference with linux v5.16.

Change-Id: I3bdf880c8b6068467665865b7cf1249d1047e833
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61470
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/util/lint/checkpatch.pl b/util/lint/checkpatch.pl
index 5b0c307d55..cd188e6bd4 100755
--- a/util/lint/checkpatch.pl
+++ b/util/lint/checkpatch.pl
@@ -42,6 +42,8 @@ my $list_types = 0;
 my $fix = 0;
 my $fix_inplace = 0;
 my $root = $P; #coreboot
+my $gitroot = $ENV{'GIT_DIR'};
+$gitroot = ".git" if !defined($gitroot);
 my %debug;
 my %camelcase = ();
 my %use_type = ();
@@ -867,7 +869,7 @@ sub seed_camelcase_includes {
 
 	$camelcase_seeded = 1;
 
-	if (-e ".git") {
+	if (-e "$gitroot") {
 		my $git_last_include_commit = `git log --no-merges --pretty=format:"%h%n" -1 -- include`;
 		chomp $git_last_include_commit;
 		$camelcase_cache = ".checkpatch-camelcase.git.$git_last_include_commit";
@@ -895,7 +897,7 @@ sub seed_camelcase_includes {
 		return;
 	}
 
-	if (-e ".git") {
+	if (-e "$gitroot") {
 		$files = `git ls-files "include/*.h"`;
 		@include_files = split('\n', $files);
 	}
@@ -918,7 +920,7 @@ sub seed_camelcase_includes {
 sub git_commit_info {
 	my ($commit, $id, $desc) = @_;
 
-	return ($id, $desc) if ((which("git") eq "") || !(-e ".git"));
+	return ($id, $desc) if ((which("git") eq "") || !(-e "$gitroot"));
 
 	my $output = `git log --no-color --format='%H %s' -1 $commit 2>&1`;
 	$output =~ s/^\s*//gm;
@@ -957,7 +959,7 @@ my $fixlinenr = -1;
 
 # If input is git commits, extract all commits from the commit expressions.
 # For example, HEAD-3 means we need check 'HEAD, HEAD~1, HEAD~2'.
-die "$P: No git repository found\n" if ($git && !-e ".git");
+die "$P: No git repository found\n" if ($git && !-e "$gitroot");
 
 if ($git) {
 	my @commits = ();