feat: add drive type support

.github/workflows/main.yml

@@ -61,3 +61,25 @@ jobs:
           drive-format: NTFS
           drive-path: "my_awesome_drive.vhdx"
           workspace-copy: true
+
+  test-large-fixed:
+    runs-on: windows-2022
+    steps:
+      - name: Check out source code
+        uses: actions/checkout@v4
+      - name: Setup Dev Drive
+        uses: ./
+        with:
+          drive-size: 10GB
+          drive-type: Dynamic
+
+  test-large-dynamic:
+    runs-on: windows-2022
+    steps:
+      - name: Check out source code
+        uses: actions/checkout@v4
+      - name: Setup Dev Drive
+        uses: ./
+        with:
+          drive-size: 10GB
+          drive-type: Dynamic

README.md

@@ -28,6 +28,7 @@ You can optionally pass parameters to the action as follows:
   with:
     drive-size: 1GB
     drive-format: ReFS
+    drive-type: Fixed
     drive-path: "dev_drive.vhdx"
     workspace-copy: true
 ```
@@ -55,6 +56,12 @@ workspace drive letter.
 When an absolute path is provided, make sure it's located outside `${{ github.workspace }}`
 otherwise `workspace-copy` can cause issues.
 
+#### `drive-type`
+
+Determines the type of drive, `Fixed` or `Dynamic`. There are performance tradeoffs between
+both, hence for the purposes of this action `Fixed` is used by default.
+`Dynamic` is useful when you want to cache the disk across job runs as it yields a smaller
+payload to cache when the job ends.
 
 #### `workspace-copy`
 
@@ -97,7 +104,7 @@ your dev drive workspace will be `E:\<project-name>` by default assuming the dri
   env:
     CARGO_HOME: ${{ env.DEV_DRIVE }}/.cargo
     RUSTUP_HOME: ${{ env.DEV_DRIVE }}/.rustup
-    run: rustup show
+  run: rustup show
 ```
 
 ## Runner Compatibility

action.yml

@@ -14,6 +14,9 @@ inputs:
   drive-path:
     description: "Absolute or relative path to the Dev Drive storage location. Example: C:/path/to/my/dev_drive.vhdx"
     default: "dev_drive.vhdx"
+  drive-type:
+    description: "Determines whether all space is allocated initially or over time. Example: Fixed or Dynamic."
+    default: "Fixed"
   workspace-copy:
     description: "Copy your GITHUB_WORKSPACE checkout to your Dev Drive. Examples: true, false."
     default: "false"

src/constants.ts

@@ -2,6 +2,7 @@ export enum ExternalInputs {
   DriveSize = 'drive-size',
   DriveFormat = 'drive-format',
   DrivePath = 'drive-path',
+  DriveType = 'drive-type',
   WorkspaceCopy = 'workspace-copy',
 }
 
@@ -18,6 +19,8 @@ export enum GithubVariables {
   GithubWorkspace = 'GITHUB_WORKSPACE',
 }
 
+export const VHDDriveTypes = new Set(['Fixed', 'Dynamic'])
+
 export const NATIVE_DEV_DRIVE_WIN_VERSION = '10.0.22621'
 
 export const POWERSHELL_BIN = 'pwsh.exe'

src/setup-dev-drive.ts

@@ -6,8 +6,9 @@ async function main() {
   const driveSize = core.getInput(ExternalInputs.DriveSize)
   const driveFormat = core.getInput(ExternalInputs.DriveFormat)
   const drivePath = core.getInput(ExternalInputs.DrivePath)
+  const driveType = core.getInput(ExternalInputs.DriveType)
   const copyWorkspace = core.getBooleanInput(ExternalInputs.WorkspaceCopy)
-  await setup(driveSize, driveFormat, drivePath, copyWorkspace)
+  await setup(driveSize, driveFormat, drivePath, driveType, copyWorkspace)
 }
 
 main().catch(err => core.setFailed(err.message))

src/setup-impl.ts

@@ -1,4 +1,5 @@
 import * as core from '@actions/core'
+import { toPlatformPath } from '@actions/core'
 import { exec, ExecOptions } from '@actions/exec'
 import { quote } from 'shell-quote'
 import os from 'node:os'
@@ -12,15 +13,16 @@ import {
   NATIVE_DEV_DRIVE_WIN_VERSION,
   POWERSHELL_BIN,
   StateVariables,
+  VHDDriveTypes,
   VHDX_EXTENSION,
   WIN_PLATFORM,
 } from './constants'
-import { toPlatformPath } from '@actions/core'
 
 function genSetupCommandArgs(
   driveSize: string,
   driveFormat: string,
   drivePath: string,
+  driveType: string,
 ): string[] {
   const sizeArg = quote([driveSize])
   const formatArg = quote([driveFormat])
@@ -36,7 +38,7 @@ function genSetupCommandArgs(
   }
 
   const pwshCommand = [
-    `$DevDrive = New-VHD -Path ${pathArg} -SizeBytes ${sizeArg} -Fixed |`,
+    `$DevDrive = New-VHD -Path ${pathArg} -SizeBytes ${sizeArg} -${driveType} |`,
     'Mount-VHD -Passthru |',
     'Initialize-Disk -Passthru |',
     'New-Partition -AssignDriveLetter -UseMaximumSize |',
@@ -53,6 +55,7 @@ async function execSetupCommand(
   driveSize: string,
   driveFormat: string,
   drivePath: string,
+  driveType: string,
 ): Promise<string> {
   const options: ExecOptions = {}
   let outStr = ''
@@ -66,7 +69,12 @@ async function execSetupCommand(
     },
   }
 
-  const pwshCommandArgs = genSetupCommandArgs(driveSize, driveFormat, drivePath)
+  const pwshCommandArgs = genSetupCommandArgs(
+    driveSize,
+    driveFormat,
+    drivePath,
+    driveType,
+  )
 
   await exec(POWERSHELL_BIN, pwshCommandArgs, options)
 
@@ -98,6 +106,7 @@ async function doCreateDevDrive(
   driveSize: string,
   driveFormat: string,
   drivePath: string,
+  driveType: string,
 ): Promise<string> {
   // Normalize User Path Input
   let normalizedDrivePath = toPlatformPath(drivePath)
@@ -108,11 +117,18 @@ async function doCreateDevDrive(
     throw new Error(`Make sure ${ExternalInputs.DrivePath} ends with ${VHDX_EXTENSION}`)
   }
 
+  // Check Drive Type
+  if (!VHDDriveTypes.has(driveType)) {
+    const allowedMsg = [...VHDDriveTypes].join(' or ')
+    throw new Error(`Make sure ${ExternalInputs.DriveType} is either ${allowedMsg}`)
+  }
+
   core.info('Creating Dev Drive...')
   const driveLetter = await execSetupCommand(
     driveSize,
     driveFormat,
     normalizedDrivePath,
+    driveType,
   )
 
   core.debug(`Exporting EnvVar ${EnvVariables.DevDrive}=${driveLetter}`)
@@ -150,13 +166,19 @@ export async function setup(
   driveSize: string,
   driveFormat: string,
   drivePath: string,
+  driveType: string,
   copyWorkspace: boolean,
 ): Promise<void> {
   if (process.platform !== WIN_PLATFORM) {
     throw new Error('This action can only run on windows.')
   }
 
-  const driveLetter = await doCreateDevDrive(driveSize, driveFormat, drivePath)
+  const driveLetter = await doCreateDevDrive(
+    driveSize,
+    driveFormat,
+    drivePath,
+    driveType,
+  )
 
   if (copyWorkspace) {
     await doCopyWorkspace(driveLetter)