Source

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

public function test_vcs_abspath() {
		$context_dirs = array( ABSPATH );
		$vcs_dirs     = array( '.svn', '.git', '.hg', '.bzr' );
		$check_dirs   = array();

		foreach ( $context_dirs as $context_dir ) {
			// Walk up from $context_dir to the root.
			do {
				$check_dirs[] = $context_dir;

				// Once we've hit '/' or 'C:\', we need to stop. dirname will keep returning the input here.
				if ( dirname( $context_dir ) === $context_dir ) {
					break;
				}

				// Continue one level at a time.
			} while ( $context_dir = dirname( $context_dir ) );
		}

		$check_dirs = array_unique( $check_dirs );

		// 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
				if ( $checkout = @is_dir( rtrim( $check_dir, '\\/' ) . "/$vcs_dir" ) ) {
					break 2;
				}
			}
		}

		/** This filter is documented in wp-admin/includes/class-wp-automatic-updater.php */
		if ( $checkout && ! apply_filters( 'automatic_updates_is_vcs_checkout', true, ABSPATH ) ) {
			return array(
				'description' => sprintf(
					/* translators: 1: Folder name. 2: Version control directory. 3: Filter name. */
					__( 'The folder %1$s was detected as being under version control (%2$s), but the %3$s filter is allowing updates.' ),
					'<code>' . $check_dir . '</code>',
					"<code>$vcs_dir</code>",
					'<code>automatic_updates_is_vcs_checkout</code>'
				),
				'severity'    => 'info',
			);
		}

		if ( $checkout ) {
			return array(
				'description' => sprintf(
					/* translators: 1: Folder name. 2: Version control directory. */
					__( 'The folder %1$s was detected as being under version control (%2$s).' ),
					'<code>' . $check_dir . '</code>',
					"<code>$vcs_dir</code>"
				),
				'severity'    => 'warning',
			);
		}

		return array(
			'description' => __( 'No version control systems were detected.' ),
			'severity'    => 'pass',
		);
	}