Add the bin directory under the local switch to the system path

CHANGELOG.md

@@ -8,6 +8,10 @@ and this project adheres to
 
 ## [unreleased]
 
+### Added
+
+- The bin directory under the local switch is now added to the system path.
+
 ### Changed
 
 - Use the week number to manage Cygwin cache.

src/installer.ts

@@ -22,6 +22,7 @@ import {
 import { installDepext, installSystemPackages } from "./depext";
 import { installDune } from "./dune";
 import {
+  exposeOpamBinPath,
   installOcaml,
   pin,
   repositoryAddAll,
@@ -145,6 +146,7 @@ export async function installer(): Promise<void> {
       await installSystemPackages(fnames);
     }
   }
+  exposeOpamBinPath();
   await exec("opam", ["--version"]);
   await exec("opam", ["depext", "--version"]);
   await exec("opam", ["exec", "--", "ocaml", "-version"]);

src/opam.ts

@@ -369,3 +369,14 @@ export async function repositoryRemoveAll(): Promise<void> {
   }
   core.endGroup();
 }
+
+export function exposeOpamBinPath(): void {
+  core.startGroup(
+    "Add the bin directory under the local switch to the system path"
+  );
+  const githubWorkspace = process.env.GITHUB_WORKSPACE ?? process.cwd();
+  const opamBinPath = path.join(githubWorkspace, "_opam", "bin");
+  core.addPath(opamBinPath);
+  core.info(`Added ${opamBinPath} to the system path`);
+  core.endGroup();
+}