fix(php-rpc): unpack the runtime bundle under the cache dir

A worker whose PHP cannot read the bundle out of the executable gets it
from an unpacked copy, which went to a directory derived from
XDG_CACHE_HOME alone. That ignored COMPOSER_CACHE_DIR, COMPOSER_HOME and
the cache-dir setting, and put the files outside the directory clear-cache
and the platform conventions cover. The callers now pass Composer's
configured cache directory down to base_path().

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/crates/shirabe/tests/common/php_worker.rs b/crates/shirabe/tests/common/php_worker.rs
index af1b6b44..b432cb4f 100644
--- a/crates/shirabe/tests/common/php_worker.rs
+++ b/crates/shirabe/tests/common/php_worker.rs
@@ -25,9 +25,14 @@ pub fn lock_php_worker() -> std::sync::MutexGuard<'static, ()> {
 }
 
 /// Requires the Composer PHP runtime's `vendor/autoload.php` into the worker, which is what makes
-/// the real `Composer\` classes autoloadable there.
+/// the real `Composer\` classes autoloadable there. A worker whose PHP cannot read the runtime out
+/// of the test binary unpacks it under a cache directory of this test run, never the one the
+/// developer's own Composer uses.
 pub fn load_composer_php_runtime() {
-    shirabe::event_dispatcher::EventDispatcher::__ensure_composer_php_runtime().unwrap();
+    static CACHE: std::sync::OnceLock<tempfile::TempDir> = std::sync::OnceLock::new();
+    let cache = CACHE.get_or_init(|| tempfile::tempdir().expect("no cache directory for the test"));
+    shirabe::event_dispatcher::EventDispatcher::__ensure_composer_php_runtime(cache.path())
+        .unwrap();
 }
 
 /// Calls a static method in the worker, panicking on either failure lane.