No default UV_CACHE_DIR on selfhosted runners

.github/workflows/test.yml

@@ -397,6 +397,30 @@ jobs:
         env:
           CACHE_HIT: ${{ steps.restore.outputs.cache-hit }}
 
+  test-cache-local:
+    strategy:
+      matrix:
+        inputs:
+          - os: ubuntu-latest
+            expected-cache-dir: "/home/runner/work/_temp/setup-uv-cache"
+          - os: windows-latest
+            expected-cache-dir: "D:\\a\\_temp\\setup-uv-cache"
+          - os: selfhosted-ubuntu-arm64
+            expected-cache-dir: "/home/ubuntu/.cache/uv"
+    runs-on: ${{ matrix.inputs.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup with cache
+        uses: ./
+        with:
+          cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-cache-local
+      - run: |
+          if [ "$UV_CACHE_DIR" != "${{ matrix.inputs.expected-cache-dir }}" ]; then
+            echo "UV_CACHE_DIR is not set to the expected value: $UV_CACHE_DIR"
+            exit 1
+          fi
+        shell: bash
+
   test-setup-cache-local:
     runs-on: selfhosted-ubuntu-arm64
     steps:
@@ -509,6 +533,7 @@ jobs:
       - test-tilde-expansion-tool-dirs
       - test-python-version
       - test-musl
+      - test-cache-local
       - test-restore-cache
       - test-restore-cache-requirements-txt
       - test-restore-cache-dependency-glob

dist/save-cache/index.js

@@ -89053,11 +89053,17 @@ function getCacheLocalPath() {
     if (cacheLocalPathInput !== "") {
         return expandTilde(cacheLocalPathInput);
     }
+    if (process.env.RUNNER_ENVIRONMENT === "github-hosted") {
         if (process.env.RUNNER_TEMP !== undefined) {
             return `${process.env.RUNNER_TEMP}${node_path_1.default.sep}setup-uv-cache`;
         }
         throw Error("Could not determine UV_CACHE_DIR. Please make sure RUNNER_TEMP is set or provide the cache-local-path input");
     }
+    if (process.platform === "win32") {
+        return `${process.env.APPDATA}${node_path_1.default.sep}uv${node_path_1.default.sep}cache`;
+    }
+    return `${process.env.HOME}${node_path_1.default.sep}.cache${node_path_1.default.sep}uv`;
+}
 function expandTilde(input) {
     if (input.startsWith("~")) {
         return `${process.env.HOME}${input.substring(1)}`;

dist/setup/index.js

@@ -124564,11 +124564,17 @@ function getCacheLocalPath() {
     if (cacheLocalPathInput !== "") {
         return expandTilde(cacheLocalPathInput);
     }
+    if (process.env.RUNNER_ENVIRONMENT === "github-hosted") {
         if (process.env.RUNNER_TEMP !== undefined) {
             return `${process.env.RUNNER_TEMP}${node_path_1.default.sep}setup-uv-cache`;
         }
         throw Error("Could not determine UV_CACHE_DIR. Please make sure RUNNER_TEMP is set or provide the cache-local-path input");
     }
+    if (process.platform === "win32") {
+        return `${process.env.APPDATA}${node_path_1.default.sep}uv${node_path_1.default.sep}cache`;
+    }
+    return `${process.env.HOME}${node_path_1.default.sep}.cache${node_path_1.default.sep}uv`;
+}
 function expandTilde(input) {
     if (input.startsWith("~")) {
         return `${process.env.HOME}${input.substring(1)}`;

src/utils/inputs.ts

@@ -64,6 +64,7 @@ function getCacheLocalPath(): string {
   if (cacheLocalPathInput !== "") {
     return expandTilde(cacheLocalPathInput);
   }
+  if (process.env.RUNNER_ENVIRONMENT === "github-hosted") {
     if (process.env.RUNNER_TEMP !== undefined) {
       return `${process.env.RUNNER_TEMP}${path.sep}setup-uv-cache`;
     }
@@ -71,6 +72,11 @@ function getCacheLocalPath(): string {
       "Could not determine UV_CACHE_DIR. Please make sure RUNNER_TEMP is set or provide the cache-local-path input",
     );
   }
+  if (process.platform === "win32") {
+    return `${process.env.APPDATA}${path.sep}uv${path.sep}cache`;
+  }
+  return `${process.env.HOME}${path.sep}.cache${path.sep}uv`;
+}
 
 function expandTilde(input: string): string {
   if (input.startsWith("~")) {