Site Health: Check if the directories are allowed when testing for a VCS checkout.

As part of determining whether to perform automatic updates, WordPress checks if it is running within a version-controlled environment, recursively looking up the filesystem to the top of the drive, looking for a Subversion, Git, Mercurial, or Bazaar directory, erring on the side of detecting a VCS checkout somewhere.

This commit reuses `WP_Automatic_Updater::is_allowed_dir()` in the Site Health test to avoid a PHP warning if the `open_basedir` directive is in use and any of the directories checked in the process are not allowed:
{{{
is_dir(): open_basedir restriction in effect. File(/.git) is not within the allowed path(s)
}}}

Follow-up to [44986], [55425].

Props Keffr3n, narenin.
Fixes #61834.

git-svn-id: https://develop.svn.wordpress.org/trunk@58921 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-admin/includes/class-wp-site-health-auto-updates.php

@@ -224,12 +224,18 @@ public function test_vcs_abspath() {
 		}
 
 		$check_dirs = array_unique( $check_dirs );
+		$updater    = new WP_Automatic_Updater();
+		$checkout   = false;
 
 		// Search all directories we've found for evidence of version control.
 		foreach ( $vcs_dirs as $vcs_dir ) {
 			foreach ( $check_dirs as $check_dir ) {
-				// phpcs:ignore Generic.CodeAnalysis.AssignmentInCondition,Squiz.PHP.DisallowMultipleAssignments
-				if ( $checkout = @is_dir( rtrim( $check_dir, '\\/' ) . "/$vcs_dir" ) ) {
+				if ( ! $updater->is_allowed_dir( $check_dir ) ) {
+					continue;
+				}
+
+				$checkout = is_dir( rtrim( $check_dir, '\\/' ) . "/$vcs_dir" );
+				if ( $checkout ) {
 					break 2;
 				}
 			}