Add an entry to the registry once the Cygwin cache is restored

Signed-off-by: Sora Morimoto <[email protected]>

CHANGELOG.md

@@ -8,6 +8,10 @@ and this project adheres to
 
 ## [unreleased]
 
+### Fixed
+
+- Add an entry to the registry once the Cygwin cache is restored.
+
 ## [3.0.0-alpha]
 
 ### Added

packages/setup-ocaml/src/cache.ts

@@ -18,7 +18,7 @@ import {
 } from "./constants.js";
 import { getLatestOpamRelease } from "./opam.js";
 import { resolveCompiler } from "./version.js";
-import { getCygwinVersion } from "./windows.js";
+import { addCygwinReg, getCygwinVersion } from "./windows.js";
 
 async function composeCygwinCacheKeys() {
   const cygwinVersion = await getCygwinVersion();
@@ -151,6 +151,9 @@ async function restoreCygwinCache() {
   const { key, restoreKeys } = await composeCygwinCacheKeys();
   const paths = composeCygwinCachePaths();
   const cacheKey = await restoreCache(key, restoreKeys, paths);
+  if (cacheKey) {
+    await addCygwinReg();
+  }
   return cacheKey;
 }
 

packages/setup-ocaml/src/windows.ts

@@ -1,3 +1,4 @@
+import * as path from "node:path";
 import * as core from "@actions/core";
 import { exec } from "@actions/exec";
 import { HttpClient } from "@actions/http-client";
@@ -74,3 +75,21 @@ export async function setupCygwin() {
     await io.cp(setup, CYGWIN_ROOT);
   });
 }
+
+export async function addCygwinReg() {
+  const keyname = path.join("HKLM", "SOFTWARE", "Cygwin", "setup");
+  const valuename = "rootdir";
+  const datatype = "REG_SZ";
+  const data = CYGWIN_ROOT;
+  await exec("reg", [
+    "add",
+    keyname,
+    "/v",
+    valuename,
+    "/t",
+    datatype,
+    "/d",
+    data,
+    "/f",
+  ]);
+}