Change in coreboot[master]: util/lint/checkpatch.pl: Use "gitroot"

[HAOUAS Elyes (Code Review)]

HAOUAS Elyes has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/61470 )

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

This is to reduce difference with linux v5.16.

Change-Id: I3bdf880c8b6068467665865b7cf1249d1047e833
Signed-off-by: Elyes HAOUAS 
---
M util/lint/checkpatch.pl
1 file changed, 6 insertions(+), 4 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/70/61470/1

diff --git a/util/lint/checkpatch.pl b/util/lint/checkpatch.pl
index fdf6818..bce724d 100755
--- a/util/lint/checkpatch.pl
+++ b/util/lint/checkpatch.pl
@@ -42,6 +42,8 @@
 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 @@

$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 @@
    	return;
    }

-	if (-e ".git") {
+	if (-e "$gitroot") {
    	$files = `git ls-files "include/*.h"`;
    	@include_files = split('\n', $files);
    }
@@ -918,7 +920,7 @@
 sub git_commit_info {
    my ($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 @@

# 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 = ();