Automation: update setup-beam version output to fceaea9

* Test Elixir main-otp-28 / Erlang maint-28

* Test Gleam nightly / OTP 28

* Tweak versioning

1. stop trying to "coerce" versions on input
2. handle `OTP-` in one more place
3. handle `nightly`

* Remove tests that should be failing previously

There is no strict 27 for macos-15, for example

* Remove similar tests

We'll test once per platform in similar conditions

* `await` for `assert.rejects` (not noticeable if alone inside `it`)

* Test maint- for strict and loose

.github/workflows/action.yml

@@ -76,6 +76,7 @@ jobs:
         uses: ./
         with:
           install-rebar: false
+          install-hex: false
           version-file: test/.tool-versions
           version-type: strict
 
@@ -89,6 +90,14 @@ jobs:
           node-version: '20'
       - run: npm install --production
       - run: npm test
+      - name: .tool-versions test
+        id: setup-beam
+        uses: ./
+        with:
+          install-rebar: false
+          install-hex: false
+          version-file: test/.tool-versions
+          version-type: strict
 
   unit_tests_macos:
     name: Unit tests (macOS)

.github/workflows/macos.yml

@@ -43,12 +43,6 @@ jobs:
             elixir-version: '1.14.3'
             os: 'macos-latest'
             version-type: 'strict'
-          - otp-version: '27'
-            os: 'macos-15'
-            version-type: 'strict'
-          - otp-version: '26'
-            os: 'macos-15'
-            version-type: 'strict'
           - otp-version: '25'
             os: 'macos-15'
           - otp-version: '26'

.github/workflows/ubuntu.yml

@@ -25,6 +25,15 @@ jobs:
       fail-fast: false
       matrix:
         combo:
+          - otp-version: '<26'
+            elixir-version: '<1.17'
+            os: 'ubuntu-22.04'
+          - otp-version: 'master'
+            elixir-version: '> 0'
+            os: 'ubuntu-24.04'
+          - otp-version: 'master'
+            elixir-version: 'main'
+            os: 'ubuntu-24.04'
           - otp-version: '27'
             elixir-version: 'v1.17.0'
             rebar3-version: '3.23'
@@ -44,12 +53,6 @@ jobs:
             elixir-version: '1.14.3'
             os: 'ubuntu-latest'
             version-type: 'strict'
-          - otp-version: '27'
-            os: 'ubuntu-24.04'
-            version-type: 'strict'
-          - otp-version: '26'
-            os: 'ubuntu-24.04'
-            version-type: 'strict'
           - otp-version: '25'
             os: 'ubuntu-24.04'
           - otp-version: '26'

.github/workflows/windows.yml

@@ -25,6 +25,12 @@ jobs:
       fail-fast: false
       matrix:
         combo:
+          - otp-version: '<26'
+            elixir-version: '<1.17'
+            os: 'ubuntu-22.04'
+          - otp-version: 'master'
+            elixir-version: '> 0'
+            os: 'ubuntu-24.04'
           - otp-version: '27'
             elixir-version: 'v1.17.0'
             rebar3-version: '3.23'

README.md

@@ -53,19 +53,25 @@ end up being parsed as `23`, which is not equivalent.
 
 #### Pre-release versions
 
-For pre-release versions, such as `v1.11.0-rc.0`, use the full version
-specifier (`v1.11.0-rc.0`) and set option `version-type` to `strict`. Pre-release versions are
-opt-in, so `1.11.x` will not match a pre-release.
+To use a pre-release version such as `v1.11.0-rc.0`, specify the exact version
+(`v1.11.0-rc.0`) and set `version-type` to `strict`.
+Note that pre-release versions are opt-in by default.
+Patterns like `1.11.x` do not include pre-release versions unless `latest` is specified.
 
 #### "Latest" versions
 
-Set a tool's version to `latest` to retrieve the latest version of a given tool.
-The latest version is (locally) calculated by the action based on the (retrieved) versions
-it knows (**note**: it is not the same as [GitHub considers it](https://docs.github.com/en/repositories/releasing-projects-on-github/managing-releases-in-a-repository)
-and some repositories might propose).
+To retrieve the most recent available version of a tool, set the version to `latest`.
+This may include pre-release versions such as release candidates.
 
-If in doubt do a test run and compare the obtained release with the one you were expecting to
-be the latest.
+If you want to target only the latest stable release and exclude pre-releases, use a
+version range like `> 0` instead.
+
+Note that the `latest` version is determined locally by the action based on the versions it
+has retrieved. This may differ from how [GitHub defines "latest"](https://docs.github.com/en/repositories/releasing-projects-on-github/managing-releases-in-a-repository),
+and some repositories may present different interpretations.
+
+If you're unsure, perform a test run and compare the resolved version against the version you
+expect to be considered the latest.
 
 ### Compatibility between Operating System and Erlang/OTP
 

dist/index.js

@@ -25890,9 +25890,11 @@ const _ = __nccwpck_require__(2356)
 
 const MAX_HTTP_RETRIES = 3
 
-main().catch((err) => {
-  core.setFailed(err.message)
-})
+if (process.env.NODE_ENV !== 'test') {
+  main().catch((err) => {
+    core.setFailed(err.message)
+  })
+}
 
 async function main() {
   checkOtpArchitecture()
@@ -25908,15 +25910,14 @@ async function main() {
     versions = parseVersionFile(versionFilePath)
   }
 
-  const osVersion = getRunnerOSVersion()
   const otpSpec = getInput('otp-version', true, 'erlang', versions)
   const elixirSpec = getInput('elixir-version', false, 'elixir', versions)
   const gleamSpec = getInput('gleam-version', false, 'gleam', versions)
   const rebar3Spec = getInput('rebar3-version', false, 'rebar', versions)
 
   if (otpSpec !== 'false') {
-    await installOTP(otpSpec, osVersion)
-    const elixirInstalled = await maybeInstallElixir(elixirSpec, otpSpec)
+    await installOTP(otpSpec)
+    const elixirInstalled = await maybeInstallElixir(elixirSpec)
     if (elixirInstalled === true) {
       const shouldMixRebar = getInput('install-rebar', false)
       await mix(shouldMixRebar, 'rebar')
@@ -25932,11 +25933,12 @@ async function main() {
   await maybeInstallRebar3(rebar3Spec)
 
   // undefined is replaced by a function, post- main branch merge
-  const setupBeamVersion = 'abd725c'
+  const setupBeamVersion = 'fceaea9'
   core.setOutput('setup-beam-version', setupBeamVersion)
 }
 
-async function installOTP(otpSpec, osVersion) {
+async function installOTP(otpSpec) {
+  const osVersion = getRunnerOSVersion()
   const otpVersion = await getOTPVersion(otpSpec, osVersion)
   core.startGroup(
     `Installing Erlang/OTP ${otpVersion} - built on ${getRunnerOSArchitecture()}/${osVersion}`,
@@ -25958,10 +25960,10 @@ async function installOTP(otpSpec, osVersion) {
   return otpVersion
 }
 
-async function maybeInstallElixir(elixirSpec, otpSpec) {
+async function maybeInstallElixir(elixirSpec) {
   let installed = false
   if (elixirSpec) {
-    const elixirVersion = await getElixirVersion(elixirSpec, otpSpec)
+    const elixirVersion = await getElixirVersion(elixirSpec)
     core.startGroup(`Installing Elixir ${elixirVersion}`)
     await doWithMirrors({
       hexMirrors: hexMirrorsInput(),
@@ -26043,10 +26045,14 @@ async function maybeInstallRebar3(rebar3Spec) {
   return installed
 }
 
+function maybeRemoveOTPPrefix(otpSpec) {
+  return otpSpec.replace(/^OTP-/, '')
+}
+
 async function getOTPVersion(otpSpec0, osVersion) {
   const [otpVersions, originListing, hexMirrors] =
     await getOTPVersions(osVersion)
-  let spec = otpSpec0.replace(/^OTP-/, '')
+  let spec = maybeRemoveOTPPrefix(otpSpec0)
   const versions = otpVersions
   const otpVersion = getVersionFromSpec(spec, versions)
 
@@ -26070,16 +26076,30 @@ function requestedVersionFor(tool, version, originListing, mirrors) {
 const knownBranches = ['main', 'master', 'maint']
 const nonSpecificVersions = ['nightly', 'latest']
 
-async function getElixirVersion(exSpec0, otpVersion0) {
-  const otpVersion = otpVersion0.match(/^(?:OTP-)?(.+)$/)[1]
-  const regex = `^(\\d{1,3}|${knownBranches.join('|')}|${nonSpecificVersions.join('|')})?.*$`
-  let otpVersionMajor = otpVersion.match(new RegExp(regex))[1]
-
+async function getElixirVersion(exSpec0) {
   const otpSuffix = /-otp-(\d+)/
   const userSuppliedOtp = exSpec0.match(otpSuffix)?.[1] ?? null
+  let otpVersionMajor = ''
 
   if (userSuppliedOtp && isVersion(userSuppliedOtp)) {
     otpVersionMajor = userSuppliedOtp
+  } else {
+    let cmd = 'erl'
+    if (process.platform === 'win32') {
+      cmd = 'erl.exe'
+    }
+    const args = [
+      '-noshell',
+      '-eval',
+      'io:format(erlang:system_info(otp_release)), halt().',
+    ]
+    await exec(cmd, args, {
+      listeners: {
+        stdout: (data) => {
+          otpVersionMajor = data.toString()
+        },
+      },
+    })
   }
 
   const [otpVersionsForElixirMap, elixirVersions, originListing, hexMirrors] =
@@ -26094,17 +26114,29 @@ async function getElixirVersion(exSpec0, otpVersion0) {
     )
   }
 
-  const elixirVersionComp = otpVersionsForElixirMap[elixirVersionFromSpec]
-  if (
-    (elixirVersionComp && elixirVersionComp.includes(otpVersionMajor)) ||
-    !isVersion(otpVersionMajor)
-  ) {
-    core.info(
-      `Using Elixir ${elixirVersionFromSpec} (built for Erlang/OTP ${otpVersionMajor})`,
-    )
-  } else {
+  let foundCombo = false
+  let otpVersionMajorIter = parseInt(otpVersionMajor)
+  let otpVersionsMajor = []
+  while (otpVersionMajorIter > otpVersionMajor - 3) {
+    otpVersionMajorIter += ''
+    otpVersionsMajor.push(otpVersionMajorIter)
+    const elixirVersionComp = otpVersionsForElixirMap[elixirVersionFromSpec]
+    if (
+      (elixirVersionComp && elixirVersionComp.includes(otpVersionMajorIter)) ||
+      !isVersion(otpVersionMajorIter)
+    ) {
+      core.info(
+        `Using Elixir ${elixirVersionFromSpec} (built for Erlang/OTP ${otpVersionMajorIter})`,
+      )
+      foundCombo = true
+      break
+    }
+    otpVersionMajorIter = parseInt(otpVersionMajorIter) - 1
+  }
+
+  if (!foundCombo) {
     throw new Error(
-      `Requested Elixir / Erlang/OTP version (${exSpec0} / ${otpVersion0}) not ` +
+      `Requested Elixir / Erlang/OTP version (${exSpec0} / tried ${otpVersionsMajor}) not ` +
         'found in version list (did you check Compatibility between Elixir and Erlang/OTP?).' +
         'Elixir and Erlang/OTP compatibility can be found at: ' +
         'https://hexdocs.pm/elixir/compatibility-and-deprecations.html',
@@ -26113,8 +26145,8 @@ async function getElixirVersion(exSpec0, otpVersion0) {
 
   let elixirVersionForDownload = elixirVersionFromSpec
 
-  if (isVersion(otpVersionMajor)) {
-    elixirVersionForDownload = `${elixirVersionFromSpec}-otp-${otpVersionMajor}`
+  if (isVersion(otpVersionMajorIter)) {
+    elixirVersionForDownload = `${elixirVersionFromSpec}-otp-${otpVersionMajorIter}`
   }
 
   return maybePrependWithV(elixirVersionForDownload)
@@ -26196,12 +26228,9 @@ async function getOTPVersions(osVersion) {
       .trim()
       .split('\n')
       .forEach((line) => {
-        const otpMatch = line
-          .match(/^([^ ]+)?( .+)/)[1]
-          .match(/^([^-]+-)?(.+)$/)
-        const otpVersion = otpMatch[2]
-        const otpVersionOrig = otpMatch[0]
-        debugLog('OTP line and parsing', [line, otpVersion, otpMatch])
+        const otpVersionOrig = line.match(/^([^ ]+)?( .+)/)[1]
+        const otpVersion = maybeRemoveOTPPrefix(otpVersionOrig)
+        debugLog('OTP line and parsing', [line, otpVersion, otpVersionOrig])
         otpVersions[otpVersion] = otpVersionOrig // we keep the original for later reference
       })
   } else if (process.platform === 'win32') {
@@ -26215,10 +26244,10 @@ async function getOTPVersions(osVersion) {
         .flat()
         .filter((x) => x.name.match(file_regex))
         .forEach((x) => {
-          const otpMatch = x.name.match(file_regex)
-          const otpVersion = otpMatch[1]
-          debugLog('OTP line and parsing', [otpMatch, otpVersion])
-          otpVersions[otpVersion] = otpVersion
+          const otpVersionOrig = x.name.match(file_regex)[1]
+          const otpVersion = otpVersionOrig
+          debugLog('OTP line and parsing', [x.name, otpVersion, otpVersionOrig])
+          otpVersions[otpVersion] = otpVersionOrig
         })
     })
   } else if (process.platform === 'darwin') {
@@ -26227,10 +26256,9 @@ async function getOTPVersions(osVersion) {
         columns: true,
       })
       .forEach((line) => {
-        const otpMatch = line.ref_name.match(/^([^-]+-)?(.+)$/)
-        const otpVersion = otpMatch[2]
-        const otpVersionOrig = otpMatch[0]
-        debugLog('OTP line and parsing', [line, otpVersion, otpMatch])
+        const otpVersionOrig = line.ref_name
+        const otpVersion = maybeRemoveOTPPrefix(otpVersionOrig)
+        debugLog('OTP line and parsing', [line, otpVersion, otpVersionOrig])
         otpVersions[otpVersion] = otpVersionOrig // we keep the original for later reference
       })
   }
@@ -26323,6 +26351,7 @@ function validVersion(v) {
     v.match(
       new RegExp(`${knownBranches.join('|')}|${nonSpecificVersions.join('|')}`),
     ) == null &&
+    // these ones are for rebar3, which has alpha and beta releases
     !v.startsWith('a') &&
     !v.startsWith('b')
   )
@@ -26349,8 +26378,14 @@ function getVersionFromSpec(spec0, versions0) {
   const altVersions = {}
   Object.entries(versions0).forEach(([version, altVersion]) => {
     let coerced
-    if (isStrictVersion() || isRC(version)) {
-      // If `version-type: strict` or version is RC, we just try to remove a potential initial v
+    if (
+      isStrictVersion() ||
+      isRC(version) ||
+      isKnownBranch(version) ||
+      isKnownVerBranch(version)
+    ) {
+      // If `version-type: strict`, version is an RC, or version is "a branch"
+      // we just try to remove a potential initial v
       coerced = maybeRemoveVPrefix(version)
     } else {
       // Otherwise, we place the version into a version bucket
@@ -26367,13 +26402,19 @@ function getVersionFromSpec(spec0, versions0) {
   const rangeMax = semver.maxSatisfying(versions, rangeForMax)
   let version = null
 
-  if (isStrictVersion() || isRC(spec0) || isKnownBranch(spec0)) {
+  if (spec0 === 'latest') {
+    version = versions0[versions0.latest]
+  } else if (
+    isStrictVersion() ||
+    isRC(spec0) ||
+    isKnownBranch(spec0) ||
+    isKnownVerBranch(spec0) ||
+    spec0 === 'nightly'
+  ) {
     if (versions0[spec]) {
-      // If `version-type: strict` or version is RC, we obtain it directly
+      // We obtain it directly
       version = versions0[spec]
     }
-  } else if (spec0 === 'latest') {
-    version = versions0[versions0.latest]
   } else if (rangeMax !== null) {
     // Otherwise, we compare alt. versions' semver ranges to this version, from highest to lowest
     const thatVersion = spec
@@ -26486,17 +26527,33 @@ function getRunnerOSVersion() {
     macos14: 'macOS-14',
     macos15: 'macOS-15',
   }
+  const deprecatedImageOSToContainer = {
+    ubuntu18: 'ubuntu-18.04',
+    ubuntu20: 'ubuntu-20.04',
+  }
   const containerFromEnvImageOS = ImageOSToContainer[process.env.ImageOS]
   if (!containerFromEnvImageOS) {
-    throw new Error(
-      "Tried to map a target OS from env. variable 'ImageOS' (got " +
-        `${process.env.ImageOS}` +
-        "), but failed. If you're using a " +
-        "self-hosted runner, you should set 'env': 'ImageOS': ... to one of the following: " +
-        "['" +
-        `${Object.keys(ImageOSToContainer).join("', '")}` +
-        "']",
-    )
+    const deprecatedContainerFromEnvImageOS =
+      deprecatedImageOSToContainer[process.env.ImageOS]
+    if (deprecatedContainerFromEnvImageOS) {
+      core.warning(
+        `You are using deprecated ImageOS ${deprecatedContainerFromEnvImageOS}. ` +
+          'Support for maintenance is very limited. Consider a non-deprecated version as ' +
+          'mentioned in the README.md.',
+      )
+
+      return deprecatedContainerFromEnvImageOS
+    } else {
+      throw new Error(
+        "Tried to map a target OS from env. variable 'ImageOS' (got " +
+          `${process.env.ImageOS}` +
+          "), but failed. If you're using a " +
+          "self-hosted runner, you should set 'env': 'ImageOS': ... to one of the following: " +
+          "['" +
+          `${Object.keys(ImageOSToContainer).join("', '")}` +
+          "']",
+      )
+    }
   }
 
   return containerFromEnvImageOS
@@ -26576,7 +26633,7 @@ function xyzAbcVersion(pref, suf) {
   // https://www.erlang.org/doc/system_principles/versions.html
   const dd = '\\.?(\\d+)?'
   return new RegExp(
-    `${pref}v?(\\d+)${dd}${dd}${dd}${dd}${dd}(?:-rc\\.?\\d+)?(?:-otp-\\d+)?${suf}`,
+    `${pref}(?:OTP-)?v?(\\d+)${dd}${dd}${dd}${dd}${dd}(?:-rc\\.?\\d+)?(?:-otp-\\d+)?${suf}`,
   )
 }
 
@@ -26625,7 +26682,7 @@ function parseVersionFile(versionFilePath0) {
   // For the time being we parse .tool-versions
   // If we ever start parsing something else, this should
   // become default in a new option named e.g. version-file-type
-  versions.split('\n').forEach((line) => {
+  versions.split(/\r?\n/).forEach((line) => {
     const appVersion = line.match(/^([^ ]+)[ ]+(ref:v?)?([^ #]+)/)
     if (appVersion) {
       const app = appVersion[1]
@@ -27046,14 +27103,18 @@ function debugLoggingEnabled() {
 
 module.exports = {
   get,
-  getOTPVersion,
   getElixirVersion,
   getGleamVersion,
+  getOTPVersion,
   getRebar3Version,
   getVersionFromSpec,
   githubAMDRunnerArchs,
   githubARMRunnerArchs,
   install,
+  installOTP,
+  maybeInstallElixir,
+  maybeInstallGleam,
+  maybeInstallRebar3,
   parseVersionFile,
 }
 

package-lock.json

@@ -15,13 +15,13 @@
         "semver": "7.7.2"
       },
       "devDependencies": {
-        "@eslint/js": "9.29.0",
+        "@eslint/js": "9.30.1",
         "@vercel/ncc": "0.38.3",
-        "eslint": "9.29.0",
+        "eslint": "9.30.1",
         "eslint-plugin-yml": "1.18.0",
-        "globals": "16.2.0",
+        "globals": "16.3.0",
         "markdownlint-cli": "0.45.0",
-        "prettier": "3.6.0",
+        "prettier": "3.6.2",
         "shellcheck": "3.1.0",
         "yarn": "1.22.22"
       },
@@ -116,11 +116,10 @@
       }
     },
     "node_modules/@eslint/config-array": {
-      "version": "0.20.1",
-      "resolved": "https://registry.npmjs.org/@eslint/config-array/-/config-array-0.20.1.tgz",
-      "integrity": "sha512-OL0RJzC/CBzli0DrrR31qzj6d6i6Mm3HByuhflhl4LOBiWxN+3i6/t/ZQQNii4tjksXi8r2CRW1wMpWA2ULUEw==",
+      "version": "0.21.0",
+      "resolved": "https://registry.npmjs.org/@eslint/config-array/-/config-array-0.21.0.tgz",
+      "integrity": "sha512-ENIdc4iLu0d93HeYirvKmrzshzofPw6VkZRKQGe9Nv46ZnWUzcF1xV01dcvEg/1wXUR61OmmlSfyeyO7EvjLxQ==",
       "dev": true,
-      "license": "Apache-2.0",
       "dependencies": {
         "@eslint/object-schema": "^2.1.6",
         "debug": "^4.3.1",
@@ -131,11 +130,10 @@
       }
     },
     "node_modules/@eslint/config-helpers": {
-      "version": "0.2.2",
-      "resolved": "https://registry.npmjs.org/@eslint/config-helpers/-/config-helpers-0.2.2.tgz",
-      "integrity": "sha512-+GPzk8PlG0sPpzdU5ZvIRMPidzAnZDl/s9L+y13iodqvb8leL53bTannOrQ/Im7UkpsmFU5Ily5U60LWixnmLg==",
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/@eslint/config-helpers/-/config-helpers-0.3.0.tgz",
+      "integrity": "sha512-ViuymvFmcJi04qdZeDc2whTHryouGcDlaxPqarTD0ZE10ISpxGUVZGZDx4w01upyIynL3iu6IXH2bS1NhclQMw==",
       "dev": true,
-      "license": "Apache-2.0",
       "engines": {
         "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       }
@@ -191,9 +189,9 @@
       }
     },
     "node_modules/@eslint/js": {
-      "version": "9.29.0",
-      "resolved": "https://registry.npmjs.org/@eslint/js/-/js-9.29.0.tgz",
-      "integrity": "sha512-3PIF4cBw/y+1u2EazflInpV+lYsSG0aByVIQzAgb1m1MhHFSbqTyNqtBKHgWf/9Ykud+DhILS9EGkmekVhbKoQ==",
+      "version": "9.30.1",
+      "resolved": "https://registry.npmjs.org/@eslint/js/-/js-9.30.1.tgz",
+      "integrity": "sha512-zXhuECFlyep42KZUhWjfvsmXGX39W8K8LFb8AWXM9gSV9dQB+MrJGLKvW6Zw0Ggnbpw0VHTtrhFXYe3Gym18jg==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -208,7 +206,6 @@
       "resolved": "https://registry.npmjs.org/@eslint/object-schema/-/object-schema-2.1.6.tgz",
       "integrity": "sha512-RBMg5FRL0I0gs51M/guSAj5/e14VQ4tpZnQNWwuDT66P14I43ItmPfIZRhO9fUVIPOAQXU47atlywZ/czoqFPA==",
       "dev": true,
-      "license": "Apache-2.0",
       "engines": {
         "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       }
@@ -967,19 +964,18 @@
       }
     },
     "node_modules/eslint": {
-      "version": "9.29.0",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-9.29.0.tgz",
-      "integrity": "sha512-GsGizj2Y1rCWDu6XoEekL3RLilp0voSePurjZIkxL3wlm5o5EC9VpgaP7lrCvjnkuLvzFBQWB3vWB3K5KQTveQ==",
+      "version": "9.30.1",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-9.30.1.tgz",
+      "integrity": "sha512-zmxXPNMOXmwm9E0yQLi5uqXHs7uq2UIiqEKo3Gq+3fwo1XrJ+hijAZImyF7hclW3E6oHz43Yk3RP8at6OTKflQ==",
       "dev": true,
-      "license": "MIT",
       "dependencies": {
         "@eslint-community/eslint-utils": "^4.2.0",
         "@eslint-community/regexpp": "^4.12.1",
-        "@eslint/config-array": "^0.20.1",
-        "@eslint/config-helpers": "^0.2.1",
+        "@eslint/config-array": "^0.21.0",
+        "@eslint/config-helpers": "^0.3.0",
         "@eslint/core": "^0.14.0",
         "@eslint/eslintrc": "^3.3.1",
-        "@eslint/js": "9.29.0",
+        "@eslint/js": "9.30.1",
         "@eslint/plugin-kit": "^0.3.1",
         "@humanfs/node": "^0.16.6",
         "@humanwhocodes/module-importer": "^1.0.1",
@@ -1411,9 +1407,9 @@
       }
     },
     "node_modules/globals": {
-      "version": "16.2.0",
-      "resolved": "https://registry.npmjs.org/globals/-/globals-16.2.0.tgz",
-      "integrity": "sha512-O+7l9tPdHCU320IigZZPj5zmRCFG9xHmx9cU8FqU2Rp+JN714seHV+2S9+JslCpY4gJwU2vOGox0wzgae/MCEg==",
+      "version": "16.3.0",
+      "resolved": "https://registry.npmjs.org/globals/-/globals-16.3.0.tgz",
+      "integrity": "sha512-bqWEnJ1Nt3neqx2q5SFfGS8r/ahumIakg3HcwtNlrVlwXIeNumWn/c7Pn/wKzGhf6SaW6H6uWXLqC30STCMchQ==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -2777,11 +2773,10 @@
       }
     },
     "node_modules/prettier": {
-      "version": "3.6.0",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.6.0.tgz",
-      "integrity": "sha512-ujSB9uXHJKzM/2GBuE0hBOUgC77CN3Bnpqa+g80bkv3T3A93wL/xlzDATHhnhkzifz/UE2SNOvmbTz5hSkDlHw==",
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.6.2.tgz",
+      "integrity": "sha512-I7AIg5boAr5R0FFtJ6rCfD+LFsWHp81dolrFD8S79U9tb8Az2nGrJncnMSnys+bpQJfRUzqs9hnA81OAA3hCuQ==",
       "dev": true,
-      "license": "MIT",
       "bin": {
         "prettier": "bin/prettier.cjs"
       },

package.json

@@ -25,11 +25,11 @@
   },
   "devDependencies": {
     "@vercel/ncc": "0.38.3",
-    "eslint": "9.29.0",
-    "@eslint/js": "9.29.0",
-    "globals": "16.2.0",
+    "eslint": "9.30.1",
+    "@eslint/js": "9.30.1",
+    "globals": "16.3.0",
     "markdownlint-cli": "0.45.0",
-    "prettier": "3.6.0",
+    "prettier": "3.6.2",
     "shellcheck": "3.1.0",
     "eslint-plugin-yml": "1.18.0",
     "yarn": "1.22.22"

src/setup-beam.js

@@ -10,9 +10,11 @@ const _ = require('lodash')
 
 const MAX_HTTP_RETRIES = 3
 
-main().catch((err) => {
-  core.setFailed(err.message)
-})
+if (process.env.NODE_ENV !== 'test') {
+  main().catch((err) => {
+    core.setFailed(err.message)
+  })
+}
 
 async function main() {
   checkOtpArchitecture()
@@ -28,15 +30,14 @@ async function main() {
     versions = parseVersionFile(versionFilePath)
   }
 
-  const osVersion = getRunnerOSVersion()
   const otpSpec = getInput('otp-version', true, 'erlang', versions)
   const elixirSpec = getInput('elixir-version', false, 'elixir', versions)
   const gleamSpec = getInput('gleam-version', false, 'gleam', versions)
   const rebar3Spec = getInput('rebar3-version', false, 'rebar', versions)
 
   if (otpSpec !== 'false') {
-    await installOTP(otpSpec, osVersion)
-    const elixirInstalled = await maybeInstallElixir(elixirSpec, otpSpec)
+    await installOTP(otpSpec)
+    const elixirInstalled = await maybeInstallElixir(elixirSpec)
     if (elixirInstalled === true) {
       const shouldMixRebar = getInput('install-rebar', false)
       await mix(shouldMixRebar, 'rebar')
@@ -52,11 +53,12 @@ async function main() {
   await maybeInstallRebar3(rebar3Spec)
 
   // undefined is replaced by a function, post- main branch merge
-  const setupBeamVersion = 'abd725c'
+  const setupBeamVersion = 'fceaea9'
   core.setOutput('setup-beam-version', setupBeamVersion)
 }
 
-async function installOTP(otpSpec, osVersion) {
+async function installOTP(otpSpec) {
+  const osVersion = getRunnerOSVersion()
   const otpVersion = await getOTPVersion(otpSpec, osVersion)
   core.startGroup(
     `Installing Erlang/OTP ${otpVersion} - built on ${getRunnerOSArchitecture()}/${osVersion}`,
@@ -78,10 +80,10 @@ async function installOTP(otpSpec, osVersion) {
   return otpVersion
 }
 
-async function maybeInstallElixir(elixirSpec, otpSpec) {
+async function maybeInstallElixir(elixirSpec) {
   let installed = false
   if (elixirSpec) {
-    const elixirVersion = await getElixirVersion(elixirSpec, otpSpec)
+    const elixirVersion = await getElixirVersion(elixirSpec)
     core.startGroup(`Installing Elixir ${elixirVersion}`)
     await doWithMirrors({
       hexMirrors: hexMirrorsInput(),
@@ -168,10 +170,14 @@ async function maybeInstallRebar3(rebar3Spec) {
   return installed
 }
 
+function maybeRemoveOTPPrefix(otpSpec) {
+  return otpSpec.replace(/^OTP-/, '')
+}
+
 async function getOTPVersion(otpSpec0, osVersion) {
   const [otpVersions, originListing, hexMirrors] =
     await getOTPVersions(osVersion)
-  let spec = otpSpec0.replace(/^OTP-/, '')
+  let spec = maybeRemoveOTPPrefix(otpSpec0)
   const versions = otpVersions
   const otpVersion = getVersionFromSpec(spec, versions)
 
@@ -195,16 +201,30 @@ function requestedVersionFor(tool, version, originListing, mirrors) {
 const knownBranches = ['main', 'master', 'maint']
 const nonSpecificVersions = ['nightly', 'latest']
 
-async function getElixirVersion(exSpec0, otpVersion0) {
-  const otpVersion = otpVersion0.match(/^(?:OTP-)?(.+)$/)[1]
-  const regex = `^(\\d{1,3}|${knownBranches.join('|')}|${nonSpecificVersions.join('|')})?.*$`
-  let otpVersionMajor = otpVersion.match(new RegExp(regex))[1]
-
+async function getElixirVersion(exSpec0) {
   const otpSuffix = /-otp-(\d+)/
   const userSuppliedOtp = exSpec0.match(otpSuffix)?.[1] ?? null
+  let otpVersionMajor = ''
 
   if (userSuppliedOtp && isVersion(userSuppliedOtp)) {
     otpVersionMajor = userSuppliedOtp
+  } else {
+    let cmd = 'erl'
+    if (process.platform === 'win32') {
+      cmd = 'erl.exe'
+    }
+    const args = [
+      '-noshell',
+      '-eval',
+      'io:format(erlang:system_info(otp_release)), halt().',
+    ]
+    await exec(cmd, args, {
+      listeners: {
+        stdout: (data) => {
+          otpVersionMajor = data.toString()
+        },
+      },
+    })
   }
 
   const [otpVersionsForElixirMap, elixirVersions, originListing, hexMirrors] =
@@ -219,17 +239,29 @@ async function getElixirVersion(exSpec0, otpVersion0) {
     )
   }
 
-  const elixirVersionComp = otpVersionsForElixirMap[elixirVersionFromSpec]
-  if (
-    (elixirVersionComp && elixirVersionComp.includes(otpVersionMajor)) ||
-    !isVersion(otpVersionMajor)
-  ) {
-    core.info(
-      `Using Elixir ${elixirVersionFromSpec} (built for Erlang/OTP ${otpVersionMajor})`,
-    )
-  } else {
+  let foundCombo = false
+  let otpVersionMajorIter = parseInt(otpVersionMajor)
+  let otpVersionsMajor = []
+  while (otpVersionMajorIter > otpVersionMajor - 3) {
+    otpVersionMajorIter += ''
+    otpVersionsMajor.push(otpVersionMajorIter)
+    const elixirVersionComp = otpVersionsForElixirMap[elixirVersionFromSpec]
+    if (
+      (elixirVersionComp && elixirVersionComp.includes(otpVersionMajorIter)) ||
+      !isVersion(otpVersionMajorIter)
+    ) {
+      core.info(
+        `Using Elixir ${elixirVersionFromSpec} (built for Erlang/OTP ${otpVersionMajorIter})`,
+      )
+      foundCombo = true
+      break
+    }
+    otpVersionMajorIter = parseInt(otpVersionMajorIter) - 1
+  }
+
+  if (!foundCombo) {
     throw new Error(
-      `Requested Elixir / Erlang/OTP version (${exSpec0} / ${otpVersion0}) not ` +
+      `Requested Elixir / Erlang/OTP version (${exSpec0} / tried ${otpVersionsMajor}) not ` +
         'found in version list (did you check Compatibility between Elixir and Erlang/OTP?).' +
         'Elixir and Erlang/OTP compatibility can be found at: ' +
         'https://hexdocs.pm/elixir/compatibility-and-deprecations.html',
@@ -238,8 +270,8 @@ async function getElixirVersion(exSpec0, otpVersion0) {
 
   let elixirVersionForDownload = elixirVersionFromSpec
 
-  if (isVersion(otpVersionMajor)) {
-    elixirVersionForDownload = `${elixirVersionFromSpec}-otp-${otpVersionMajor}`
+  if (isVersion(otpVersionMajorIter)) {
+    elixirVersionForDownload = `${elixirVersionFromSpec}-otp-${otpVersionMajorIter}`
   }
 
   return maybePrependWithV(elixirVersionForDownload)
@@ -321,12 +353,9 @@ async function getOTPVersions(osVersion) {
       .trim()
       .split('\n')
       .forEach((line) => {
-        const otpMatch = line
-          .match(/^([^ ]+)?( .+)/)[1]
-          .match(/^([^-]+-)?(.+)$/)
-        const otpVersion = otpMatch[2]
-        const otpVersionOrig = otpMatch[0]
-        debugLog('OTP line and parsing', [line, otpVersion, otpMatch])
+        const otpVersionOrig = line.match(/^([^ ]+)?( .+)/)[1]
+        const otpVersion = maybeRemoveOTPPrefix(otpVersionOrig)
+        debugLog('OTP line and parsing', [line, otpVersion, otpVersionOrig])
         otpVersions[otpVersion] = otpVersionOrig // we keep the original for later reference
       })
   } else if (process.platform === 'win32') {
@@ -340,10 +369,10 @@ async function getOTPVersions(osVersion) {
         .flat()
         .filter((x) => x.name.match(file_regex))
         .forEach((x) => {
-          const otpMatch = x.name.match(file_regex)
-          const otpVersion = otpMatch[1]
-          debugLog('OTP line and parsing', [otpMatch, otpVersion])
-          otpVersions[otpVersion] = otpVersion
+          const otpVersionOrig = x.name.match(file_regex)[1]
+          const otpVersion = otpVersionOrig
+          debugLog('OTP line and parsing', [x.name, otpVersion, otpVersionOrig])
+          otpVersions[otpVersion] = otpVersionOrig
         })
     })
   } else if (process.platform === 'darwin') {
@@ -352,10 +381,9 @@ async function getOTPVersions(osVersion) {
         columns: true,
       })
       .forEach((line) => {
-        const otpMatch = line.ref_name.match(/^([^-]+-)?(.+)$/)
-        const otpVersion = otpMatch[2]
-        const otpVersionOrig = otpMatch[0]
-        debugLog('OTP line and parsing', [line, otpVersion, otpMatch])
+        const otpVersionOrig = line.ref_name
+        const otpVersion = maybeRemoveOTPPrefix(otpVersionOrig)
+        debugLog('OTP line and parsing', [line, otpVersion, otpVersionOrig])
         otpVersions[otpVersion] = otpVersionOrig // we keep the original for later reference
       })
   }
@@ -448,6 +476,7 @@ function validVersion(v) {
     v.match(
       new RegExp(`${knownBranches.join('|')}|${nonSpecificVersions.join('|')}`),
     ) == null &&
+    // these ones are for rebar3, which has alpha and beta releases
     !v.startsWith('a') &&
     !v.startsWith('b')
   )
@@ -474,8 +503,14 @@ function getVersionFromSpec(spec0, versions0) {
   const altVersions = {}
   Object.entries(versions0).forEach(([version, altVersion]) => {
     let coerced
-    if (isStrictVersion() || isRC(version)) {
-      // If `version-type: strict` or version is RC, we just try to remove a potential initial v
+    if (
+      isStrictVersion() ||
+      isRC(version) ||
+      isKnownBranch(version) ||
+      isKnownVerBranch(version)
+    ) {
+      // If `version-type: strict`, version is an RC, or version is "a branch"
+      // we just try to remove a potential initial v
       coerced = maybeRemoveVPrefix(version)
     } else {
       // Otherwise, we place the version into a version bucket
@@ -492,13 +527,19 @@ function getVersionFromSpec(spec0, versions0) {
   const rangeMax = semver.maxSatisfying(versions, rangeForMax)
   let version = null
 
-  if (isStrictVersion() || isRC(spec0) || isKnownBranch(spec0)) {
+  if (spec0 === 'latest') {
+    version = versions0[versions0.latest]
+  } else if (
+    isStrictVersion() ||
+    isRC(spec0) ||
+    isKnownBranch(spec0) ||
+    isKnownVerBranch(spec0) ||
+    spec0 === 'nightly'
+  ) {
     if (versions0[spec]) {
-      // If `version-type: strict` or version is RC, we obtain it directly
+      // We obtain it directly
       version = versions0[spec]
     }
-  } else if (spec0 === 'latest') {
-    version = versions0[versions0.latest]
   } else if (rangeMax !== null) {
     // Otherwise, we compare alt. versions' semver ranges to this version, from highest to lowest
     const thatVersion = spec
@@ -611,17 +652,33 @@ function getRunnerOSVersion() {
     macos14: 'macOS-14',
     macos15: 'macOS-15',
   }
+  const deprecatedImageOSToContainer = {
+    ubuntu18: 'ubuntu-18.04',
+    ubuntu20: 'ubuntu-20.04',
+  }
   const containerFromEnvImageOS = ImageOSToContainer[process.env.ImageOS]
   if (!containerFromEnvImageOS) {
-    throw new Error(
-      "Tried to map a target OS from env. variable 'ImageOS' (got " +
-        `${process.env.ImageOS}` +
-        "), but failed. If you're using a " +
-        "self-hosted runner, you should set 'env': 'ImageOS': ... to one of the following: " +
-        "['" +
-        `${Object.keys(ImageOSToContainer).join("', '")}` +
-        "']",
-    )
+    const deprecatedContainerFromEnvImageOS =
+      deprecatedImageOSToContainer[process.env.ImageOS]
+    if (deprecatedContainerFromEnvImageOS) {
+      core.warning(
+        `You are using deprecated ImageOS ${deprecatedContainerFromEnvImageOS}. ` +
+          'Support for maintenance is very limited. Consider a non-deprecated version as ' +
+          'mentioned in the README.md.',
+      )
+
+      return deprecatedContainerFromEnvImageOS
+    } else {
+      throw new Error(
+        "Tried to map a target OS from env. variable 'ImageOS' (got " +
+          `${process.env.ImageOS}` +
+          "), but failed. If you're using a " +
+          "self-hosted runner, you should set 'env': 'ImageOS': ... to one of the following: " +
+          "['" +
+          `${Object.keys(ImageOSToContainer).join("', '")}` +
+          "']",
+      )
+    }
   }
 
   return containerFromEnvImageOS
@@ -701,7 +758,7 @@ function xyzAbcVersion(pref, suf) {
   // https://www.erlang.org/doc/system_principles/versions.html
   const dd = '\\.?(\\d+)?'
   return new RegExp(
-    `${pref}v?(\\d+)${dd}${dd}${dd}${dd}${dd}(?:-rc\\.?\\d+)?(?:-otp-\\d+)?${suf}`,
+    `${pref}(?:OTP-)?v?(\\d+)${dd}${dd}${dd}${dd}${dd}(?:-rc\\.?\\d+)?(?:-otp-\\d+)?${suf}`,
   )
 }
 
@@ -750,7 +807,7 @@ function parseVersionFile(versionFilePath0) {
   // For the time being we parse .tool-versions
   // If we ever start parsing something else, this should
   // become default in a new option named e.g. version-file-type
-  versions.split('\n').forEach((line) => {
+  versions.split(/\r?\n/).forEach((line) => {
     const appVersion = line.match(/^([^ ]+)[ ]+(ref:v?)?([^ #]+)/)
     if (appVersion) {
       const app = appVersion[1]
@@ -1171,13 +1228,17 @@ function debugLoggingEnabled() {
 
 module.exports = {
   get,
-  getOTPVersion,
   getElixirVersion,
   getGleamVersion,
+  getOTPVersion,
   getRebar3Version,
   getVersionFromSpec,
   githubAMDRunnerArchs,
   githubARMRunnerArchs,
   install,
+  installOTP,
+  maybeInstallElixir,
+  maybeInstallGleam,
+  maybeInstallRebar3,
   parseVersionFile,
 }

test/setup-beam.test.js

@@ -1,3 +1,5 @@
+process.env.NODE_ENV = 'test'
+
 simulateInput('otp-version', '25.1.2')
 simulateInput('otp-architecture', '64')
 simulateInput('elixir-version', '1.14.2')
@@ -75,7 +77,7 @@ describe('OTP install', () => {
     const otpOSVersion = 'ubuntu-08.04'
     const otpVersion = 'OTP-23.2'
 
-    assert.rejects(
+    await assert.rejects(
       async () => {
         await setupBeam.install('otp', {
           hexMirror: 'https://builds.hex.pm',
@@ -95,7 +97,7 @@ describe('OTP install', () => {
 describe('Elixir install', () => {
   it('fails for version 0.11 without OTP', async () => {
     const exVersion = '0.11'
-    assert.rejects(
+    await assert.rejects(
       async () => {
         await setupBeam.install('elixir', {
           hexMirror: 'https://builds.hex.pm',
@@ -112,7 +114,7 @@ describe('Elixir install', () => {
 
   it('fails for version 1.0.0 on OTP 17 (without OTP)', async () => {
     const exVersion = 'v1.0.0-otp-17'
-    assert.rejects(
+    await assert.rejects(
       async () => {
         await setupBeam.install('elixir', {
           hexMirror: 'https://builds.hex.pm',
@@ -131,7 +133,7 @@ describe('Elixir install', () => {
 describe('Gleam install', () => {
   it('fails for unknown OTP', async () => {
     const gleamVersion = '0.1.3'
-    assert.rejects(
+    await assert.rejects(
       async () => {
         await setupBeam.install('gleam', { gleamVersion })
       },
@@ -147,7 +149,7 @@ describe('Gleam install', () => {
 describe('rebar3 install', () => {
   it('fails for unknown OTP', async () => {
     const r3Version = '0.14.4'
-    assert.rejects(
+    await assert.rejects(
       async () => {
         await setupBeam.install('rebar3', { r3Version })
       },
@@ -177,14 +179,6 @@ describe('.getOTPVersion(_) - Erlang', () => {
     process.env.RUNNER_ARCH = 'X64'
 
     it('is Ok for known linux version', async () => {
-      before = simulateInput('version-type', 'strict')
-      spec = '26'
-      osVersion = 'ubuntu-24.04'
-      expected = 'maint-26'
-      got = await setupBeam.getOTPVersion(spec, osVersion)
-      assert.deepStrictEqual(got, expected)
-      simulateInput('version-type', before)
-
       before = simulateInput('version-type', 'strict')
       spec = '27.0'
       osVersion = 'ubuntu-24.04'
@@ -309,19 +303,46 @@ describe('.getOTPVersion(_) - Erlang', () => {
   }
 
   if (process.platform === 'linux') {
-    it('is Ok for known linux ARM64 version', async () => {
+    it('is main-... only if strict/maint-... is used as input', async () => {
       const arm64Options = setupBeam.githubARMRunnerArchs()
       process.env.RUNNER_ARCH =
         arm64Options[Math.floor(Math.random() * arm64Options.length)]
 
       before = simulateInput('version-type', 'strict')
-      spec = '26'
-      osVersion = 'ubuntu-24.04'
-      expected = 'maint-26'
-      got = await setupBeam.getOTPVersion(spec, osVersion)
-      assert.deepStrictEqual(got, expected)
+      await assert.rejects(
+        async () => {
+          await setupBeam.getOTPVersion('27', 'ubuntu-24.04')
+        },
+        (err) => {
+          assert.ok(err instanceof Error)
+          return true
+        },
+        `Fetching strict OTP version maint-<v> with input <v> is supposed to fail`,
+      )
       simulateInput('version-type', before)
 
+      before = simulateInput('version-type', 'strict')
+      assert.strictEqual(
+        await setupBeam.getOTPVersion('maint-27', 'ubuntu-24.04'),
+        'maint-27',
+      )
+      simulateInput('version-type', before)
+
+      before = simulateInput('version-type', 'loose')
+      assert.strictEqual(
+        await setupBeam.getOTPVersion('maint-27', 'ubuntu-24.04'),
+        'maint-27',
+      )
+      simulateInput('version-type', before)
+
+      process.env.RUNNER_ARCH = previousRunnerArch
+    })
+
+    it('is Ok for known linux ARM64 version', async () => {
+      const arm64Options = setupBeam.githubARMRunnerArchs()
+      process.env.RUNNER_ARCH =
+        arm64Options[Math.floor(Math.random() * arm64Options.length)]
+
       before = simulateInput('version-type', 'strict')
       spec = '27.0'
       osVersion = 'ubuntu-24.04'
@@ -386,14 +407,6 @@ describe('.getOTPVersion(_) - Erlang', () => {
       process.env.RUNNER_ARCH =
         amd64Options[Math.floor(Math.random() * amd64Options.length)]
 
-      before = simulateInput('version-type', 'strict')
-      spec = '26'
-      osVersion = 'ubuntu-24.04'
-      expected = 'maint-26'
-      got = await setupBeam.getOTPVersion(spec, osVersion)
-      assert.deepStrictEqual(got, expected)
-      simulateInput('version-type', before)
-
       before = simulateInput('version-type', 'strict')
       spec = '27.0'
       osVersion = 'ubuntu-24.04'
@@ -473,6 +486,35 @@ describe('.getOTPVersion(_) - Erlang', () => {
   }
 
   if (process.platform === 'darwin') {
+    it('is main-... only if strict/maint-... is used as input', async () => {
+      const arm64Options = setupBeam.githubARMRunnerArchs()
+      process.env.RUNNER_ARCH =
+        arm64Options[Math.floor(Math.random() * arm64Options.length)]
+
+      before = simulateInput('version-type', 'strict')
+      await assert.rejects(
+        async () => {
+          await setupBeam.getOTPVersion('27')
+        },
+        (err) => {
+          assert.ok(err instanceof Error)
+          return true
+        },
+        `Fetching strict OTP version maint-<v> with input <v> is supposed to fail`,
+      )
+      simulateInput('version-type', before)
+
+      before = simulateInput('version-type', 'strict')
+      assert.strictEqual(await setupBeam.getOTPVersion('maint-27'), 'maint-27')
+      simulateInput('version-type', before)
+
+      before = simulateInput('version-type', 'loose')
+      assert.strictEqual(await setupBeam.getOTPVersion('maint-27'), 'maint-27')
+      simulateInput('version-type', before)
+
+      process.env.RUNNER_ARCH = previousRunnerArch
+    })
+
     it('is Ok for known macos ARM64 version', async () => {
       const arm64Options = setupBeam.githubARMRunnerArchs()
       process.env.RUNNER_ARCH =
@@ -515,7 +557,7 @@ describe('OTP arch-specific install', () => {
       const spec = '26'
       const osVersion = 'ubuntu-24.04'
 
-      assert.rejects(
+      await assert.rejects(
         async () => {
           await setupBeam.getOTPVersion(spec, osVersion)
         },
@@ -536,77 +578,70 @@ describe('.getOTPVersion(_) - Elixir', () => {
   let spec
   let otpVersion
   let before
-  const hexMirrors = simulateInput('hexpm-mirrors', 'https://repo.hex.pm', {
-    multiline: true,
-  })
+  const previousRunnerArch = process.env.RUNNER_ARCH
 
-  it('returns the expected value', async () => {
-    spec = '1.1.x'
-    otpVersion = 'OTP-17'
-    expected = 'v1.1.1-otp-17'
-    got = await setupBeam.getElixirVersion(spec, otpVersion)
-    assert.deepStrictEqual(got, expected)
+  if (process.platform === 'linux') {
+    process.env.RUNNER_ARCH = 'X64'
 
-    spec = '1.10.4'
-    otpVersion = 'OTP-23'
-    expected = 'v1.10.4-otp-23'
-    got = await setupBeam.getElixirVersion(spec, otpVersion)
-    assert.deepStrictEqual(got, expected)
+    it('returns the expected value', async () => {
+      spec = '1.18.x'
+      otpVersion = 'OTP-27'
+      expected = 'v1.18.4-otp-27'
+      await setupBeam.installOTP(otpVersion)
+      got = await setupBeam.getElixirVersion(spec, otpVersion)
+      assert.deepStrictEqual(got, expected)
 
-    spec = '1.16.2-otp-26'
-    otpVersion = 'OTP-27'
-    expected = 'v1.16.2-otp-26'
-    got = await setupBeam.getElixirVersion(spec, otpVersion)
-    assert.deepStrictEqual(got, expected)
+      spec = '1.18.2'
+      otpVersion = 'OTP-27'
+      expected = 'v1.18.2-otp-27'
+      await setupBeam.installOTP(otpVersion)
+      got = await setupBeam.getElixirVersion(spec, otpVersion)
+      assert.deepStrictEqual(got, expected)
 
-    spec = '1.12.1'
-    otpVersion = 'OTP-24.0.2'
-    expected = 'v1.12.1-otp-24'
-    got = await setupBeam.getElixirVersion(spec, otpVersion)
-    assert.deepStrictEqual(got, expected)
+      spec = '1.16.2-otp-26'
+      otpVersion = 'OTP-27'
+      expected = 'v1.16.2-otp-26'
+      await setupBeam.installOTP(otpVersion)
+      got = await setupBeam.getElixirVersion(spec, otpVersion)
+      assert.deepStrictEqual(got, expected)
 
-    before = simulateInput('version-type', 'strict')
-    spec = '1.14.0'
-    otpVersion = 'main'
-    expected = 'v1.14.0'
-    got = await setupBeam.getElixirVersion(spec, otpVersion)
-    assert.deepStrictEqual(got, expected)
-    simulateInput('version-type', before)
+      spec = '1.12.1'
+      otpVersion = 'OTP-24.3.4'
+      expected = 'v1.12.1-otp-24'
+      await setupBeam.installOTP(otpVersion)
+      got = await setupBeam.getElixirVersion(spec, otpVersion)
+      assert.deepStrictEqual(got, expected)
 
-    before = simulateInput('version-type', 'strict')
-    spec = 'v1.11.0-rc.0'
-    otpVersion = 'OTP-23'
-    expected = 'v1.11.0-rc.0-otp-23'
-    got = await setupBeam.getElixirVersion(spec, otpVersion)
-    assert.deepStrictEqual(got, expected)
-    simulateInput('version-type', before)
+      before = simulateInput('version-type', 'strict')
+      spec = '1.17'
+      otpVersion = 'master'
+      expected = 'v1.17-otp-27'
+      await setupBeam.installOTP(otpVersion)
+      got = await setupBeam.getElixirVersion(spec, otpVersion)
+      assert.deepStrictEqual(got, expected)
+      simulateInput('version-type', before)
 
-    before = simulateInput('version-type', 'strict')
-    spec = 'v1.11.0-rc.0-otp-23'
-    otpVersion = 'OTP-23'
-    expected = 'v1.11.0-rc.0-otp-23'
-    got = await setupBeam.getElixirVersion(spec, otpVersion)
-    assert.deepStrictEqual(got, expected)
-    simulateInput('version-type', before)
+      before = simulateInput('version-type', 'strict')
+      spec = 'v1.15.0-rc.2'
+      otpVersion = 'OTP-26.0'
+      expected = 'v1.15.0-rc.2-otp-26'
+      await setupBeam.installOTP(otpVersion)
+      got = await setupBeam.getElixirVersion(spec, otpVersion)
+      assert.deepStrictEqual(got, expected)
+      simulateInput('version-type', before)
 
-    before = simulateInput('version-type', 'strict')
-    spec = 'v1.11.0'
-    otpVersion = '22.3.4.2'
-    expected = 'v1.11.0-otp-22'
-    got = await setupBeam.getElixirVersion(spec, otpVersion)
-    assert.deepStrictEqual(got, expected)
-    simulateInput('version-type', before)
+      before = simulateInput('version-type', 'strict')
+      spec = 'main'
+      otpVersion = '25.2'
+      expected = 'main-otp-25'
+      await setupBeam.installOTP(otpVersion)
+      got = await setupBeam.getElixirVersion(spec, otpVersion)
+      assert.deepStrictEqual(got, expected)
+      simulateInput('version-type', before)
+    })
+  }
 
-    before = simulateInput('version-type', 'strict')
-    spec = 'main'
-    otpVersion = '23.1'
-    expected = 'main-otp-23'
-    got = await setupBeam.getElixirVersion(spec, otpVersion)
-    assert.deepStrictEqual(got, expected)
-    simulateInput('version-type', before)
-  })
-
-  simulateInput('hexpm-mirrors', hexMirrors, { multiline: true })
+  process.env.RUNNER_ARCH = previousRunnerArch
 })
 
 describe('.getOTPVersion(_) - Gleam', () => {
@@ -622,6 +657,12 @@ describe('.getOTPVersion(_) - Gleam', () => {
     got = await setupBeam.getGleamVersion(spec, otpVersion)
     assert.deepStrictEqual(got, expected)
 
+    spec = 'nightly'
+    otpVersion = '28'
+    expected = 'nightly'
+    got = await setupBeam.getGleamVersion(spec, otpVersion)
+    assert.deepStrictEqual(got, expected)
+
     spec = '0.13.2'
     otpVersion = 'OTP-24'
     expected = 'v0.13.2'
@@ -875,11 +916,21 @@ describe('.getVersionFromSpec(_)', () => {
     got = setupBeam.getVersionFromSpec(spec, matrix.otp['ubuntu-20.04'])
     assert.deepStrictEqual(got, expected)
 
+    spec = '> 0'
+    expected = 'OTP-26.2.5'
+    got = setupBeam.getVersionFromSpec(spec, matrix.otp['ubuntu-22.04'])
+    assert.deepStrictEqual(got, expected)
+
     spec = 'latest'
     expected = 'OTP-27.0-rc3'
     got = setupBeam.getVersionFromSpec(spec, matrix.otp['ubuntu-22.04'])
     assert.deepStrictEqual(got, expected)
 
+    spec = '> 0'
+    expected = 'OTP-27.0'
+    got = setupBeam.getVersionFromSpec(spec, matrix.otp['ubuntu-24.04'])
+    assert.deepStrictEqual(got, expected)
+
     spec = 'latest'
     expected = 'OTP-27.0'
     got = setupBeam.getVersionFromSpec(spec, matrix.otp['ubuntu-24.04'])
@@ -921,19 +972,21 @@ describe('version file', () => {
   const otpVersion = unsimulateInput('otp-version')
   const elixirVersion = unsimulateInput('elixir-version')
   const gleamVersion = unsimulateInput('gleam-version')
-  const rebar3Version = unsimulateInput('rebar3-version')
 
   it('is parsed correctly', async () => {
-    const erlang = '27'
-    const elixir = '1.17.0'
-    const gleam = '0.23.0'
-    const rebar3 = '3.24.0'
-    const toolVersions = `# a comment
-erlang   ref:v${erlang}# comment, no space, and ref:v
+    const erlang = '27.3.4.1'
+    const elixir = '1.18.4'
+    const gleam = '1.9.1'
+    let toolVersions = `# a comment
+erlang   ref:v${erlang}
 elixir ref:${elixir}  # comment, with space and ref:
  not-gleam 0.23 # not picked up
-gleam ${gleam} \nrebar ${rebar3}`
+gleam ${gleam} \n`
     const filename = 'test/.tool-versions'
+    if (process.platform === 'win32') {
+      // Force \r\n to test in Windows
+      toolVersions = toolVersions.replace(/\n/g, '\r\n')
+    }
     fs.writeFileSync(filename, toolVersions)
     process.env.GITHUB_WORKSPACE = ''
     const appVersions = setupBeam.parseVersionFile(filename)
@@ -957,15 +1010,11 @@ gleam ${gleam} \nrebar ${rebar3}`
     assert.ok(async () => {
       await setupBeam.install('gleam', { toolVersion: gleam })
     })
-    assert.ok(async () => {
-      await setupBeam.install('rebar3', { toolVersion: rebar3 })
-    })
   })
 
   simulateInput('otp-version', otpVersion)
   simulateInput('elixir-version', elixirVersion)
   simulateInput('gleam-version', gleamVersion)
-  simulateInput('rebar3-version', rebar3Version)
 })
 
 describe('.get(_)', () => {