Fix #64: Try to mitigate failing to eject secondary disk

This will hopefully fix or mitigate the following error that occurs
when trying to eject the secondary disk:

```
hdiutil: couldn't eject "disk2" - Resource busy
```

changelog.md

@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+- FreeBSD jobs occasionally fail when ejecting the disk ([#64](https://github.com/cross-platform-actions/action/issues/64))
+
 ## [0.21.0] - 2023-10-26
 ### Added
 - Add support for OpenBSD 7.4 ([openbsd-builder#15](https://github.com/cross-platform-actions/openbsd-builder/issues/15))

src/resource_disk.ts

@@ -8,6 +8,7 @@ import * as exec from '@actions/exec'
 import {Action} from './action/action'
 import {execWithOutput} from './utility'
 import type {OperatingSystem} from './operating_system'
+import {wait} from './wait'
 
 export default abstract class ResourceDisk {
   protected readonly operatingSystem: OperatingSystem
@@ -124,7 +125,21 @@ class MacOs extends ResourceDisk {
   }
 
   override async detachDevice(devicePath: string): Promise<void> {
-    await exec.exec('hdiutil', ['detach', devicePath])
+    const maxRetries = 150
+    const waitTimeSeconds = 1
+
+    for (let i = 0; i < maxRetries; i++) {
+      try {
+        await exec.exec('hdiutil', ['detach', devicePath])
+        return
+      } catch (error: unknown) {
+        const err = error as Error
+        core.debug(`Failed to detach device: ${err.message}`)
+        await wait(waitTimeSeconds * 1000)
+      }
+    }
+
+    core.error(`Failed to detach device after ${maxRetries} retries`)
   }
 }