Add automatic toolchain version detection

.github/workflows/test-latest.yml

@@ -53,3 +53,34 @@ jobs:
           version: latest
       - run: rye sync
         working-directory: __tests__/fixtures/rye-project
+
+  test-latest-automatic-toolchain:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, macos-14, oracle-aarch64]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Determine expected python version
+        id: determine-expected-python-version
+        run: |
+          EXPECTED_PYTHON_VERSION=$(cat .python-version)
+          echo "EXPECTED_PYTHON_VERSION=$EXPECTED_PYTHON_VERSION" >> "$GITHUB_OUTPUT"
+        working-directory: __tests__/fixtures/rye-project
+      - name: Setup rye
+        uses: ./
+        with:
+          version: latest
+          working-directory: __tests__/fixtures/rye-project
+      - run: rye sync
+        working-directory: __tests__/fixtures/rye-project
+      - name: Check python version
+        run: |
+          ACTUAL_PYTHON_VERSION=$(ls $RYE_HOME/py)
+          if [ "$ACTUAL_PYTHON_VERSION" != "$EXPECTED_PYTHON_VERSION" ];
+          then
+            echo "$ACTUAL_PYTHON_VERSION is not the same as $EXPECTED_PYTHON_VERSION"
+            exit 1
+          fi
+        env:
+          EXPECTED_PYTHON_VERSION: ${{ steps.determine-expected-python-version.outputs.EXPECTED_PYTHON_VERSION }}

src/restore-cache.ts

@@ -10,9 +10,10 @@ import {getArch} from './utils'
 
 export const STATE_CACHE_KEY = 'cache-key'
 export const STATE_CACHE_MATCHED_KEY = 'cache-matched-key'
-export const workingDirInput = core.getInput('working-directory')
-export const workingDir = workingDirInput ? `${path.sep}${workingDirInput}` : ''
-export const venvPath = `${process.env['GITHUB_WORKSPACE']}${workingDir}${path.sep}.venv`
+const workingDirInput = core.getInput('working-directory')
+const workingDir = workingDirInput ? `${path.sep}${workingDirInput}` : ''
+export const WORKING_DIR_PATH = `${process.env['GITHUB_WORKSPACE']}${workingDir}`
+export const VENV_PATH = `${process.env['GITHUB_WORKSPACE']}${workingDir}${path.sep}.venv`
 const CACHE_VERSION = '5'
 const cacheLocalStoragePath =
   `${core.getInput('cache-local-storage-path')}` || ''
@@ -34,7 +35,7 @@ export async function restoreCache(
   try {
     matchedKey = cacheLocalStoragePath
       ? await restoreCacheLocal(cacheKey)
-      : await cache.restoreCache([venvPath], cacheKey)
+      : await cache.restoreCache([VENV_PATH], cacheKey)
   } catch (err) {
     const message = (err as Error).message
     core.warning(message)
@@ -73,7 +74,7 @@ function handleMatchResult(
 
   const venvPathMatch = doesCachedVenvPathMatchCurrentVenvPath()
   if (!venvPathMatch) {
-    fs.rmSync(venvPath, {recursive: true})
+    fs.rmSync(VENV_PATH, {recursive: true})
     core.setOutput('cache-hit', false)
     return
   }
@@ -86,12 +87,12 @@ function handleMatchResult(
 }
 
 function doesCachedVenvPathMatchCurrentVenvPath(): boolean {
-  const ryeVenvPath = `${venvPath}${path.sep}rye-venv.json`
+  const ryeVenvPath = `${VENV_PATH}${path.sep}rye-venv.json`
   const ryeVenv = JSON.parse(fs.readFileSync(ryeVenvPath, 'utf8'))
   core.info(
-    `Checking if the cached .venv matches the current path: ${venvPath}`
+    `Checking if the cached .venv matches the current path: ${VENV_PATH}`
   )
-  if (ryeVenv.venv_path !== venvPath) {
+  if (ryeVenv.venv_path !== VENV_PATH) {
     core.warning(
       `The .venv in the cache cannot be used because it is from another location: ${ryeVenv.venv_path}`
     )
@@ -105,7 +106,7 @@ async function restoreCacheLocal(
 ): Promise<string | undefined> {
   const storedCache = `${cacheLocalStoragePath}${path.sep}${primaryKey}`
   if (await exists(storedCache)) {
-    await cp(`${storedCache}${path.sep}.venv`, venvPath, {
+    await cp(`${storedCache}${path.sep}.venv`, VENV_PATH, {
       recursive: true
     })
     return primaryKey

src/save-cache.ts

@@ -5,7 +5,7 @@ import path from 'path'
 import {
   STATE_CACHE_MATCHED_KEY,
   STATE_CACHE_KEY,
-  venvPath
+  VENV_PATH
 } from './restore-cache'
 
 const enableCache = core.getInput('enable-cache') === 'true'
@@ -36,18 +36,18 @@ async function saveCache(): Promise<void> {
     core.info(`Cache hit occurred on key ${cacheKey}, not saving .venv.`)
     return
   }
-  core.info(`Saving .venv path: ${venvPath}`)
+  core.info(`Saving .venv path: ${VENV_PATH}`)
   cacheLocalStoragePath
     ? await saveCacheLocal(cacheKey)
-    : await cache.saveCache([venvPath], cacheKey)
+    : await cache.saveCache([VENV_PATH], cacheKey)
 
   core.info(`.venv saved with the key: ${cacheKey}`)
 }
 
 async function saveCacheLocal(cacheKey: string): Promise<void> {
   const targetPath = `${cacheLocalStoragePath}${path.sep}${cacheKey}`
   await io.mkdirP(targetPath)
-  await io.cp(venvPath, `${targetPath}${path.sep}.venv`, {
+  await io.cp(VENV_PATH, `${targetPath}${path.sep}.venv`, {
     recursive: true
   })
 }

src/setup-rye.ts

@@ -5,7 +5,7 @@ import * as io from '@actions/io'
 import * as path from 'path'
 import * as fs from 'fs'
 import {downloadVersion, tryGetFromCache} from './download/download-version'
-import {restoreCache} from './restore-cache'
+import {restoreCache, WORKING_DIR_PATH} from './restore-cache'
 import {
   Architecture,
   EARLIEST_VERSION_WITH_NO_MODIFY_PATHSUPPORT,
@@ -103,13 +103,18 @@ async function installRye(
   core.debug(`Created temporary directory ${tempDir}`)
   // Cache first to get the correct path
   const cachedPath = await tc.cacheDir(tempDir, toolsCacheName, version, arch)
+  const toolchainVersion = await determineToolchainVersion()
+  const env = toolchainVersion
+    ? {
+        ...process.env,
+        RYE_HOME: cachedPath,
+        RYE_TOOLCHAIN_VERSION: toolchainVersion
+      }
+    : {...process.env, RYE_HOME: cachedPath}
   const options: exec.ExecOptions = {
     cwd: cachedPath,
     silent: !core.isDebug(),
-    env: {
-      ...process.env,
-      RYE_HOME: cachedPath
-    }
+    env: env
   }
   core.info(`Installing Rye into ${cachedPath}`)
   const execArgs = ['self', 'install', '--yes']
@@ -122,6 +127,22 @@ async function installRye(
   return cachedPath
 }
 
+async function determineToolchainVersion(): Promise<string | void> {
+  const pythonVersionFile = `${WORKING_DIR_PATH}${path.sep}.python-version`
+  if (fs.existsSync(pythonVersionFile)) {
+    const toolchainVersion = await fs.promises.readFile(
+      pythonVersionFile,
+      'utf8'
+    )
+    core.info(`Determined RYE_TOOLCHAIN_VERSION: ${toolchainVersion.trim()}`)
+    return toolchainVersion.trim()
+  }
+  core.warning(
+    `No .python-version file found, using default RYE_TOOLCHAIN_VERSION`
+  )
+  return
+}
+
 async function createConfigBackup(installedPath: string): Promise<void> {
   if (fs.existsSync(`${installedPath}${path.sep}${RYE_CONFIG_TOML}`)) {
     await io.cp(