Use wpcli_ prefix to distinguish WP-CLI cron lock from spawn_cron transient

Co-authored-by: swissspidy <841956+swissspidy@users.noreply.github.com>

Author: Copilot

features/cron-event.feature

@@ -252,8 +252,9 @@ Feature: Manage WP Cron events
       Success: Scheduled event with hook 'wp_cli_test_event_lock'
       """
 
-    # Simulate an in-progress cron run by setting the doing_cron transient to now.
-    When I run `wp eval 'set_transient( "doing_cron", sprintf( "%.22F", microtime( true ) ) );'`
+    # Simulate an in-progress WP-CLI cron run by setting the doing_cron transient
+    # with the 'wpcli_' prefix that WP-CLI uses.
+    When I run `wp eval 'set_transient( "doing_cron", "wpcli_" . sprintf( "%.22F", microtime( true ) ) );'`
 
     And I try `wp cron event run --due-now`
     Then STDERR should contain:

src/Cron_Event_Command.php

@@ -249,11 +249,19 @@ public function run( $args, $assoc_args ) {
 		if ( $due_now ) {
 			$lock_timeout         = defined( 'WP_CRON_LOCK_TIMEOUT' ) ? WP_CRON_LOCK_TIMEOUT : 60;
 			$doing_cron_transient = get_transient( 'doing_cron' );
-			if ( is_string( $doing_cron_transient ) && (float) $doing_cron_transient > microtime( true ) - $lock_timeout ) {
+			// Only treat the lock as belonging to another WP-CLI run when WP-CLI
+			// itself set it (value starts with 'wpcli_'). WordPress's spawn_cron()
+			// always stores a plain numeric microtime string, so we must not block
+			// ourselves on a transient that was set by spawn_cron during bootstrap.
+			if (
+				is_string( $doing_cron_transient ) &&
+				0 === strncmp( $doing_cron_transient, 'wpcli_', 6 ) &&
+				(float) substr( $doing_cron_transient, 6 ) > microtime( true ) - $lock_timeout
+			) {
 				WP_CLI::warning( 'A cron event run is already in progress; skipping.' );
 				return;
 			}
-			set_transient( 'doing_cron', sprintf( '%.22F', microtime( true ) ) );
+			set_transient( 'doing_cron', 'wpcli_' . sprintf( '%.22F', microtime( true ) ) );
 		}
 
 		$events = self::get_selected_cron_events( $args, $assoc_args );