From 2abe6cda7aebef61794fefb3fb28ad5bab8bb158 Mon Sep 17 00:00:00 2001
From: peter madsen-mygdal <petermm@gmail.com>
Date: Sat, 14 Mar 2026 17:29:49 +0100
Subject: [PATCH] fix: download correct Gleam binary for macOS and Linux ARM64
 (#428)

The Gleam installer had two arch-related bugs:

1. Darwin reused the Linux config (installOpts.darwin = installOpts.linux),
   downloading x86_64-unknown-linux-musl on macOS, causing ENOEXEC.

2. Linux hardcoded x86_64, downloading the wrong binary on ARM64 runners,
   causing 'Syntax error' when trying to execute an x86_64 ELF.

Add arch detection via getRunnerOSArchitecture() to both Linux and
Darwin download URLs, selecting the correct aarch64 or x86_64 binary.
Add a proper Darwin config that downloads apple-darwin archives.
---
 dist/index.js     | 25 +++++++++++++++++++++++--
 src/setup-beam.js | 25 +++++++++++++++++++++++--
 2 files changed, 46 insertions(+), 4 deletions(-)

diff --git a/dist/index.js b/dist/index.js
index e6f1440..a4371b0 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -58558,12 +58558,14 @@ async function install(toolName, opts) {
         tool: 'Gleam',
         linux: {
           downloadToolURL: () => {
+            const arch = getRunnerOSArchitecture()
             let gz
             if (
               versionSpec === 'nightly' ||
               node_modules_semver.gt(versionSpec, 'v0.22.1')
             ) {
-              gz = `gleam-${versionSpec}-x86_64-unknown-linux-musl.tar.gz`
+              const target = arch === 'arm64' ? 'aarch64' : 'x86_64'
+              gz = `gleam-${versionSpec}-${target}-unknown-linux-musl.tar.gz`
             } else {
               gz = `gleam-${versionSpec}-linux-amd64.tar.gz`
             }
@@ -58627,7 +58629,26 @@ async function install(toolName, opts) {
           },
         },
       }
-      installOpts.darwin = installOpts.linux
+      installOpts.darwin = {
+        downloadToolURL: () => {
+          const arch = getRunnerOSArchitecture()
+          let gz
+          if (versionSpec === 'nightly' || node_modules_semver.gt(versionSpec, 'v0.22.1')) {
+            const target = arch === 'arm64' ? 'aarch64' : 'x86_64'
+            gz = `gleam-${versionSpec}-${target}-apple-darwin.tar.gz`
+          } else {
+            gz =
+              arch === 'arm64'
+                ? `gleam-${versionSpec}-macos-arm64.tar.gz`
+                : `gleam-${versionSpec}-macos.tar.gz`
+          }
+
+          return `https://github.com/gleam-lang/gleam/releases/download/${versionSpec}/${gz}`
+        },
+        extract: installOpts.linux.extract,
+        postExtract: installOpts.linux.postExtract,
+        reportVersion: installOpts.linux.reportVersion,
+      }
       break
     case 'rebar3':
       installOpts = {
diff --git a/src/setup-beam.js b/src/setup-beam.js
index 0ce339f..7ac4c20 100644
--- a/src/setup-beam.js
+++ b/src/setup-beam.js
@@ -1051,12 +1051,14 @@ async function install(toolName, opts) {
         tool: 'Gleam',
         linux: {
           downloadToolURL: () => {
+            const arch = getRunnerOSArchitecture()
             let gz
             if (
               versionSpec === 'nightly' ||
               semver.gt(versionSpec, 'v0.22.1')
             ) {
-              gz = `gleam-${versionSpec}-x86_64-unknown-linux-musl.tar.gz`
+              const target = arch === 'arm64' ? 'aarch64' : 'x86_64'
+              gz = `gleam-${versionSpec}-${target}-unknown-linux-musl.tar.gz`
             } else {
               gz = `gleam-${versionSpec}-linux-amd64.tar.gz`
             }
@@ -1120,7 +1122,26 @@ async function install(toolName, opts) {
           },
         },
       }
-      installOpts.darwin = installOpts.linux
+      installOpts.darwin = {
+        downloadToolURL: () => {
+          const arch = getRunnerOSArchitecture()
+          let gz
+          if (versionSpec === 'nightly' || semver.gt(versionSpec, 'v0.22.1')) {
+            const target = arch === 'arm64' ? 'aarch64' : 'x86_64'
+            gz = `gleam-${versionSpec}-${target}-apple-darwin.tar.gz`
+          } else {
+            gz =
+              arch === 'arm64'
+                ? `gleam-${versionSpec}-macos-arm64.tar.gz`
+                : `gleam-${versionSpec}-macos.tar.gz`
+          }
+
+          return `https://github.com/gleam-lang/gleam/releases/download/${versionSpec}/${gz}`
+        },
+        extract: installOpts.linux.extract,
+        postExtract: installOpts.linux.postExtract,
+        reportVersion: installOpts.linux.reportVersion,
+      }
       break
     case 'rebar3':
       installOpts = {