Fix global Git ignore for self-hosted runner

CHANGELOG.md

@@ -8,6 +8,10 @@ and this project adheres to
 
 ## [unreleased]
 
+### Fixed
+
+- Fix global Git ignore for self-hosted runner.
+
 ## [3.0.5]
 
 ### Changed

packages/setup-ocaml/src/cache.ts

@@ -8,7 +8,7 @@ import * as system from "systeminformation";
 import {
   ARCHITECTURE,
   CACHE_PREFIX,
-  CYGWIN_LOCAL_PACKAGE_DIRECTORY,
+  CYGWIN_MIRROR_ENCODED_URI,
   CYGWIN_ROOT,
   DUNE_CACHE_ROOT,
   GITHUB_WORKSPACE,
@@ -65,9 +65,13 @@ async function composeOpamCacheKeys() {
 
 function composeCygwinCachePaths() {
   const cygwinRootSymlinkPath = path.posix.join("/cygdrive", "d", "cygwin");
+  const cygwinLocalPackageDirectory = path.join(
+    GITHUB_WORKSPACE,
+    CYGWIN_MIRROR_ENCODED_URI,
+  );
   const paths = [
-    CYGWIN_LOCAL_PACKAGE_DIRECTORY,
     CYGWIN_ROOT,
+    cygwinLocalPackageDirectory,
     cygwinRootSymlinkPath,
   ];
   return paths;

packages/setup-ocaml/src/constants.ts

@@ -52,11 +52,8 @@ export const CYGWIN_MIRROR = "https://cygwin.mirror.constant.com/";
 
 export const GITHUB_WORKSPACE = process.env.GITHUB_WORKSPACE ?? process.cwd();
 
-export const CYGWIN_LOCAL_PACKAGE_DIRECTORY = (() => {
-  const cygwinMirrorEncodedUri =
-    encodeURIComponent(CYGWIN_MIRROR).toLowerCase();
-  return path.join(GITHUB_WORKSPACE, cygwinMirrorEncodedUri);
-})();
+export const CYGWIN_MIRROR_ENCODED_URI =
+  encodeURIComponent(CYGWIN_MIRROR).toLowerCase();
 
 // [HACK] https://github.com/ocaml/setup-ocaml/pull/55
 export const CYGWIN_ROOT = path.join("D:", "cygwin");

packages/setup-ocaml/src/windows.ts

@@ -9,8 +9,8 @@ import * as toolCache from "@actions/tool-cache";
 import * as cheerio from "cheerio";
 import * as semver from "semver";
 import {
-  CYGWIN_LOCAL_PACKAGE_DIRECTORY,
   CYGWIN_MIRROR,
+  CYGWIN_MIRROR_ENCODED_URI,
   CYGWIN_ROOT,
 } from "./constants.js";
 
@@ -45,14 +45,27 @@ async function setGitToIgnoreCygwinLocalPackageDirectory() {
     : path.join(homeDir, ".config", "git");
   await fs.mkdir(globalGitConfigDir, { recursive: true });
   const globalGitIgnorePath = path.join(globalGitConfigDir, "ignore");
-  await fs.appendFile(globalGitIgnorePath, CYGWIN_LOCAL_PACKAGE_DIRECTORY, {
-    encoding: "utf8",
-  });
-  await exec(
-    "git",
-    ["config", "--add", "--global", "core.excludesfile", globalGitIgnorePath],
-    { windowsVerbatimArguments: true },
-  );
+  try {
+    await fs.access(globalGitIgnorePath, fs.constants.R_OK);
+    const contents = await fs.readFile(globalGitIgnorePath, {
+      encoding: "utf8",
+    });
+    if (!contents.includes(CYGWIN_MIRROR_ENCODED_URI)) {
+      await fs.appendFile(globalGitIgnorePath, CYGWIN_MIRROR_ENCODED_URI, {
+        encoding: "utf8",
+      });
+    }
+  } catch {
+    await fs.writeFile(globalGitIgnorePath, CYGWIN_MIRROR_ENCODED_URI, {
+      encoding: "utf8",
+    });
+  } finally {
+    await exec(
+      "git",
+      ["config", "--add", "--local", "core.excludesfile", globalGitIgnorePath],
+      { windowsVerbatimArguments: true },
+    );
+  }
 }
 
 export async function setupCygwin() {