fix: prevent EBUSY caused by parallel dlx (#8604)

.changeset/green-bikes-sparkle.md

@@ -0,0 +1,6 @@
+---
+"@pnpm/plugin-commands-script-runners": patch
+"pnpm": patch
+---
+
+Prevent `EBUSY` errors caused by calling `symlinkDir` in parallel `dlx` processes.

exec/plugin-commands-script-runners/src/dlx.ts

@@ -91,7 +91,17 @@ export async function handler (
       saveOptional: false,
       savePeer: false,
     }, pkgs)
-    await symlinkDir(cachedDir, cacheLink, { overwrite: true })
+    try {
+      await symlinkDir(cachedDir, cacheLink, { overwrite: true })
+    } catch (error) {
+      // EBUSY means that there is another dlx process running in parallel that has acquired the cache link first.
+      // The link created by the other process is just as up-to-date as the link the current process was attempting
+      // to create. Therefore, instead of re-attempting to create the current link again, it is just as good to let
+      // the other link stay. The current process should yield.
+      if (!util.types.isNativeError(error) || !('code' in error) || error.code !== 'EBUSY') {
+        throw error
+      }
+    }
   }
   const modulesDir = path.join(cachedDir, 'node_modules')
   const binsDir = path.join(modulesDir, '.bin')