Add production dependencies & build

EOL was almost a month ago. Woops.

I don't care about people using an old version of GitHub Enterprise, so I'm not going to annoy every single user of this action with a breaking update like GH did with their core actions. If you're a user of GHE: consider this a breaking update.

.github/CODEOWNERS

@@ -0,0 +1 @@
+*       @julia-actions/reviewers

.github/dependabot.yml

@@ -0,0 +1,7 @@
+version: 2
+updates:
+- package-ecosystem: gitsubmodule
+  directory: "/"
+  schedule:
+    interval: daily
+  open-pull-requests-limit: 10

.github/workflows/backup.yml

@@ -0,0 +1,33 @@
+name: Backup
+
+on:
+  schedule:
+    - cron: '5 4 * * 0'
+
+  workflow_dispatch:
+
+jobs:
+  backup:
+    runs-on: ubuntu-20.04
+
+    steps:
+      - name: Configure cache
+        uses: actions/cache@v2
+        with:
+          path: |
+            ${{ env.GITHUB_WORKSPACE }}
+            ~/.cache/restic
+          key: ${{ runner.os }}
+
+      - name: Install the correct Python version
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.x'
+
+      - name: Run backup action
+        uses: julia-actions/restic-action@main
+        env: # Options: https://restic.readthedocs.io/en/latest/040_backup.html#environment-variables
+          RESTIC_REPOSITORY: b2:${{ secrets.B2_BUCKET }}:${{ github.repository }}
+          RESTIC_PASSWORD: ${{ secrets.RESTIC_PASSWORD }}
+          B2_ACCOUNT_ID: ${{ secrets.B2_ACCOUNT_ID }}
+          B2_ACCOUNT_KEY: ${{ secrets.B2_ACCOUNT_KEY }}

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,67 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ master, releases/* ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ master ]
+  schedule:
+    - cron: '32 22 * * 6'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'javascript' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
+        # Learn more:
+        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1

.github/workflows/example-builds-nightly.yml

@@ -2,6 +2,7 @@ name: Example builds (nightly)
 
 on:
   push:
+    branches: ['main', 'master', 'releases/*']
   pull_request:
   schedule:
     - cron: '37 17 * * *'
@@ -12,6 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
+        julia-version: [nightly, 1.8-nightly]
         julia-arch: [x64, x86]
         os: [ubuntu-latest, macOS-latest, windows-latest]
         # 32-bit Julia binaries are not available on macOS
@@ -28,10 +30,10 @@ jobs:
           npm run build
           npm run pack
 
-      - name: "Set up Julia (nightly)"
+      - name: "Set up Julia (${{ matrix.julia-version }})"
         uses: ./
         with:
-          version: nightly
+          version: ${{ matrix.julia-version }}
           arch: ${{ matrix.julia-arch }}
-          show-versioninfo: 'true'
       - run: julia --version
+      - run: julia --compile=min -O0 -e 'import InteractiveUtils; InteractiveUtils.versioninfo()'

.github/workflows/example-builds.yml

@@ -1,6 +1,10 @@
 name: Example builds
 
-on: [push, pull_request]
+on:
+  push:
+    branches: ['main', 'master', 'releases/*']
+  pull_request:
+  workflow_dispatch:
 
 jobs:
   test:
@@ -31,5 +35,5 @@ jobs:
         with:
           version: ${{ matrix.julia-version }}
           arch: ${{ matrix.julia-arch }}
-          show-versioninfo: 'true'
       - run: julia --version
+      - run: julia --compile=min -O0 -e 'import InteractiveUtils; InteractiveUtils.versioninfo()'

.gitignore

@@ -1,3 +1,3 @@
 node_modules/
 __tests__/runner/*
-dist/
+!dist/

README.md

@@ -1,5 +1,6 @@
 # setup-julia Action
 
+[![CodeQL](https://github.com/julia-actions/setup-julia/workflows/CodeQL/badge.svg)](https://securitylab.github.com/tools/codeql)
 [![Dependabot Status](https://api.dependabot.com/badges/status?host=github&repo=julia-actions/setup-julia)](https://dependabot.com)
 
 This action sets up a Julia environment for use in actions by downloading a specified version of Julia and adding it to PATH.
@@ -7,18 +8,78 @@ This action sets up a Julia environment for use in actions by downloading a spec
 ## Table of Contents
 - [Table of Contents](#table-of-contents)
 - [Usage](#usage)
+  - [Inputs](#inputs)
+  - [Outputs](#outputs)
   - [Basic](#basic)
   - [Julia Versions](#julia-versions)
   - [Matrix Testing](#matrix-testing)
+  - [versioninfo](#versioninfo)
 - [Versioning](#versioning)
 - [Debug logs](#debug-logs)
 - [Third party information](#third-party-information)
 
 ## Usage
 
-See [action.yml](action.yml).
+### Inputs
 
-You can find a list of example workflows making use of this action here: [julia-actions/example-workflows](https://github.com/julia-actions/example-workflows).
+```yaml
+- uses: julia-actions/setup-julia@v1
+  with:
+    # The Julia version that will be installed and added as `julia` to the PATH.
+    # See "Julia Versions" below for a list of valid values.
+    #
+    # Warning: It is strongly recommended to wrap this value in quotes.
+    #          Otherwise, the YAML parser used by GitHub Actions parses certain
+    #          versions as numbers which causes the wrong version to be selected.
+    #          For example, `1.0` may be parsed as `1`.
+    #
+    # Default: '1'
+    version: ''
+
+    # The architecture of the Julia binaries.
+    #
+    # Please note that installing aarch64 binaries only makes sense on self-hosted aarch64 runners.
+    # We currently don't run test builds on that architecture, so we cannot guarantee that the input won't break randomly,
+    # although there is no reason why it would.
+    #
+    # Supported values: x64 | x86 | aarch64 (untested)
+    #
+    # Default: x64
+    arch: ''
+
+    # Set the display setting for printing InteractiveUtils.versioninfo() after installing.
+    #
+    # Starting Julia and running InteractiveUtils.versioninfo() takes a significant amount of time (1s or ~10% of the total build time in testing),
+    # so you may not want to run it in every build, in particular on paid runners, as this cost will add up quickly.
+    #
+    # See "versioninfo" below for example usage and further explanations.
+    #
+    # Supported values: true | false | never
+    #
+    # true: Always print versioninfo
+    # false: Only print versioninfo for nightly Julia
+    # never: Never print versioninfo
+    #
+    # Default: false
+    show-versioninfo: ''
+```
+
+### Outputs
+
+```yaml
+outputs:
+  # The installed Julia version.
+  # May vary from the version input if a version range was given as input.
+  #
+  # Example output: '1.5.3'
+
+  julia-version: ''
+  # Path to the directory containing the Julia executable.
+  # Equivalent to JULIA_BINDIR: https://docs.julialang.org/en/v1/manual/environment-variables/#JULIA_BINDIR
+  #
+  # Example output: '/opt/hostedtoolcache/julia/1.5.3/x64/bin'
+  julia-bindir: ''
+```
 
 ### Basic
 
@@ -35,7 +96,7 @@ steps:
 
 You can either specify specific Julia versions or version ranges. If you specify a version range, the **highest** available Julia version that matches the range will be selected.
 
-**Warning:** It is strongly recommended to wrap versions in quotes. Otherwise, the YAML parser used by GitHub Actions parses certain versions as numbers which causes the wrong version to be selected. For example, `1.0` is parsed as `1`.
+**Warning:** It is strongly recommended to wrap versions in quotes. Otherwise, the YAML parser used by GitHub Actions parses certain versions as numbers which causes the wrong version to be selected. For example, `1.0` may be parsed as `1`.
 
 #### Examples
 
@@ -46,6 +107,7 @@ You can either specify specific Julia versions or version ranges. If you specify
 - `^1.3.0-0` is a **caret** version range that includes _all_ pre-releases. It matches all versions `≥ 1.3.0-` and `< 2.0.0`.
 - `~1.3.0-0` is a **tilde** version range that includes _all_ pre-releases. It matches all versions `≥ 1.3.0-` and `< 1.4.0`.
 - `nightly` will install the latest nightly build.
+- `1.7-nightly` will install the latest nightly build for the upcoming 1.7 release. This version will only be available during certain phases of the Julia release cycle.
 
 Internally the action uses node's semver package to resolve version ranges. Its [documentation](https://github.com/npm/node-semver#advanced-range-syntax) contains more details on the version range syntax. You can test what version will be selected for a given input in this JavaScript [REPL](https://repl.it/@SaschaMann/setup-julia-version-logic).
 
@@ -129,6 +191,16 @@ jobs:
         shell: bash
 ```
 
+### versioninfo
+
+By default, only the output of `julia --version` is printed as verification that Julia has been installed for stable versions of Julia.
+`InteractiveUtils.versioninfo()` is run by default for nightly builds.
+
+Starting Julia and printing the full versioninfo takes a significant amount of time (1s or ~10% of the total build time in testing), so you may not want to run it in every build, in particular on paid runners as this cost will add up quickly.
+However, `julia --version` does not provide sufficient information to know which commit a nightly binary was built from, therefore it is useful to show the full versioninfo on nightly builds regardless.
+
+You can override this behaviour by changing the input to `never` if you never want to run `InteractiveUtils.versioninfo()` or to `true` if you always want to run `InteractiveUtils.versioninfo()`, even on stable Julia builds.
+
 ## Versioning
 
 This action follows [GitHub's advice](https://help.github.com/en/articles/about-actions#versioning-your-action) on versioning actions, with an additional `latest` tag.
@@ -141,11 +213,11 @@ You can specify commits, branches or tags in your workflows as follows:
 
 ```yaml
 steps:
-  - uses: julia-actions/setup-julia@d26d1111976eae5f00db04f0515ab744ec9cd79e # commit SHA of the tagged 1.3.1 commit
-  - uses: julia-actions/setup-julia@master  # branch
+  - uses: julia-actions/setup-julia@d3ce119a16594ea9e5d7974813970c73b6ab9e94 # commit SHA of the tagged 1.4.1 commit
   - uses: julia-actions/setup-julia@latest  # latest version tag (may break existing workflows)
   - uses: julia-actions/setup-julia@v1      # major version tag
-  - uses: julia-actions/setup-julia@v0.1.0  # specific version tag
+  - uses: julia-actions/setup-julia@v1.4    # minor version tag
+  - uses: julia-actions/setup-julia@v1.4.1  # specific version tag
 ```
 
 If your workflow requires access to secrets, you should always pin it to a commit SHA instead of a tag.

action.yml

@@ -14,10 +14,12 @@ inputs:
     required: false
     default: 'false'
 outputs:
+  julia-version:
+    description: 'The installed Julia version. May vary from the version input if a version range was given as input.'
   julia-bindir:
     description: 'Path to the directory containing the Julia executable. Equivalent to JULIA_BINDIR: https://docs.julialang.org/en/v1/manual/environment-variables/#JULIA_BINDIR'
 runs:
-  using: 'node12'
+  using: 'node16'
   main: 'dist/index.js'
 branding:
   icon: 'download'

lib/installer.js

@@ -22,6 +22,7 @@ const crypto = __importStar(require("crypto"));
 const fs = __importStar(require("fs"));
 const os = __importStar(require("os"));
 const path = __importStar(require("path"));
+const retry = require("async-retry");
 const semver = __importStar(require("semver"));
 // Translations between actions input and Julia arch names
 const osMap = {
@@ -31,7 +32,8 @@ const osMap = {
 };
 const archMap = {
     'x86': 'i686',
-    'x64': 'x86_64'
+    'x64': 'x86_64',
+    'aarch64': 'aarch64'
 };
 // Store information about the environment
 const osPlat = os.platform(); // possible values: win32 (Windows), linux (Linux), darwin (macOS)
@@ -59,7 +61,15 @@ function calculateChecksum(file) {
  */
 function getJuliaVersionInfo() {
     return __awaiter(this, void 0, void 0, function* () {
-        const versionsFile = yield tc.downloadTool('https://julialang-s3.julialang.org/bin/versions.json');
+        // Occasionally the connection is reset for unknown reasons
+        // In those cases, retry the download
+        const versionsFile = yield retry((bail) => __awaiter(this, void 0, void 0, function* () {
+            return yield tc.downloadTool('https://julialang-s3.julialang.org/bin/versions.json');
+        }), {
+            onRetry: (err) => {
+                core.debug(`Download of versions.json failed, trying again. Error: ${err}`);
+            }
+        });
         return JSON.parse(fs.readFileSync(versionsFile).toString());
     });
 }
@@ -78,14 +88,10 @@ function getJuliaVersions(versionInfo) {
 }
 exports.getJuliaVersions = getJuliaVersions;
 function getJuliaVersion(availableReleases, versionInput) {
-    if (semver.valid(versionInput) == versionInput) {
-        // versionInput is a valid version, use it directly
+    if (semver.valid(versionInput) == versionInput || versionInput.endsWith('nightly')) {
+        // versionInput is a valid version or a nightly version, use it directly
         return versionInput;
     }
-    // nightlies
-    if (versionInput == 'nightly') {
-        return 'nightly';
-    }
     // Use the highest available version that matches versionInput
     let version = semver.maxSatisfying(availableReleases, versionInput);
     if (version == null) {
@@ -119,22 +125,35 @@ function getNightlyFileName(arch) {
     return `julia-latest${versionExt}.${ext}`;
 }
 function getFileInfo(versionInfo, version, arch) {
-    if (version == 'nightly') {
+    const err = `Could not find ${archMap[arch]}/${version} binaries`;
+    if (version.endsWith('nightly')) {
         return null;
     }
+    if (!versionInfo[version]) {
+        throw err;
+    }
     for (let file of versionInfo[version].files) {
         if (file.os == osMap[osPlat] && file.arch == archMap[arch]) {
             return file;
         }
     }
-    throw `Could not find ${archMap[arch]}/${version} binaries`;
+    throw err;
 }
 exports.getFileInfo = getFileInfo;
 function getDownloadURL(fileInfo, version, arch) {
+    const baseURL = `https://julialangnightlies-s3.julialang.org/bin/${osMap[osPlat]}/${arch}`;
+    // release branch nightlies, e.g. 1.6-nightlies should return .../bin/linux/x64/1.6/julia-latest-linux64.tar.gz
+    const majorMinorMatches = /^(\d*.\d*)-nightly/.exec(version);
+    if (majorMinorMatches) {
+        return `${baseURL}/${majorMinorMatches[1]}/${getNightlyFileName(arch)}`;
+    }
     // nightlies
     if (version == 'nightly') {
-        const baseURL = 'https://julialangnightlies-s3.julialang.org/bin';
-        return `${baseURL}/${osMap[osPlat]}/${arch}/${getNightlyFileName(arch)}`;
+        return `${baseURL}/${getNightlyFileName(arch)}`;
+    }
+    // Verify that fileInfo.url points at the official Julia download servers
+    if (!fileInfo.url.startsWith('https://julialang-s3.julialang.org/')) {
+        throw new Error(`versions.json points at a download location outside of Julia's download server: ${fileInfo.url}. Aborting for security reasons.`);
     }
     return fileInfo.url;
 }
@@ -145,9 +164,17 @@ function installJulia(versionInfo, version, arch) {
         const fileInfo = getFileInfo(versionInfo, version, arch);
         const downloadURL = getDownloadURL(fileInfo, version, arch);
         core.debug(`downloading Julia from ${downloadURL}`);
-        const juliaDownloadPath = yield tc.downloadTool(downloadURL);
+        // Occasionally the connection is reset for unknown reasons
+        // In those cases, retry the download
+        const juliaDownloadPath = yield retry((bail) => __awaiter(this, void 0, void 0, function* () {
+            return yield tc.downloadTool(downloadURL);
+        }), {
+            onRetry: (err) => {
+                core.debug(`Download of ${downloadURL} failed, trying again. Error: ${err}`);
+            }
+        });
         // Verify checksum
-        if (version != 'nightly') {
+        if (!version.endsWith('nightly')) {
             const checkSum = yield calculateChecksum(juliaDownloadPath);
             if (fileInfo.sha256 != checkSum) {
                 throw new Error(`Checksum of downloaded file does not match the expected checksum from versions.json.\nExpected: ${fileInfo.sha256}\nGot: ${checkSum}`);
@@ -165,7 +192,7 @@ function installJulia(versionInfo, version, arch) {
                 yield exec.exec('tar', ['xf', juliaDownloadPath, '--strip-components=1', '-C', tempInstallDir]);
                 return tempInstallDir;
             case 'win32':
-                if (version == 'nightly' || semver.gtr(version, '1.3', { includePrerelease: true })) {
+                if (version.endsWith('nightly') || semver.gtr(version, '1.3', { includePrerelease: true })) {
                     // The installer changed in 1.4: https://github.com/JuliaLang/julia/blob/ef0c9108b12f3ae177c51037934351ffa703b0b5/NEWS.md#build-system-changes
                     yield exec.exec('powershell', ['-Command', `Start-Process -FilePath ${juliaDownloadPath} -ArgumentList "/SILENT /dir=${path.join(process.cwd(), tempInstallDir)}" -NoNewWindow -Wait`]);
                 }
@@ -183,3 +210,40 @@ function installJulia(versionInfo, version, arch) {
     });
 }
 exports.installJulia = installJulia;
+/**
+ * Test if Julia has been installed and print the version.
+ *
+ * true => always show versioninfo
+ * false => only show on nightlies
+ * never => never show it anywhere
+ *
+ * @param showVersionInfoInput
+ */
+function showVersionInfo(showVersionInfoInput, version) {
+    return __awaiter(this, void 0, void 0, function* () {
+        // --compile=min -O0 reduces the time from ~1.8-1.9s to ~0.8-0.9s
+        let exitCode;
+        switch (showVersionInfoInput) {
+            case 'true':
+                exitCode = yield exec.exec('julia', ['--compile=min', '-O0', '-e', 'using InteractiveUtils; versioninfo()']);
+                break;
+            case 'false':
+                if (version.endsWith('nightly')) {
+                    exitCode = yield exec.exec('julia', ['--compile=min', '-O0', '-e', 'using InteractiveUtils; versioninfo()']);
+                }
+                else {
+                    exitCode = yield exec.exec('julia', ['--version']);
+                }
+                break;
+            case 'never':
+                exitCode = yield exec.exec('julia', ['--version']);
+                break;
+            default:
+                throw new Error(`${showVersionInfoInput} is not a valid value for show-versioninfo. Supported values: true | false | never`);
+        }
+        if (exitCode !== 0) {
+            throw new Error(`Julia could not be installed properly. Exit code: ${exitCode}`);
+        }
+    });
+}
+exports.showVersionInfo = showVersionInfo;

lib/setup-julia.js

@@ -16,7 +16,6 @@ var __importStar = (this && this.__importStar) || function (mod) {
 };
 Object.defineProperty(exports, "__esModule", { value: true });
 const core = __importStar(require("@actions/core"));
-const exec = __importStar(require("@actions/exec"));
 const tc = __importStar(require("@actions/tool-cache"));
 const fs = __importStar(require("fs"));
 const https = __importStar(require("https"));
@@ -58,6 +57,7 @@ function run() {
             const availableReleases = yield installer.getJuliaVersions(versionInfo);
             const version = installer.getJuliaVersion(availableReleases, versionInput);
             core.debug(`selected Julia version: ${arch}/${version}`);
+            core.setOutput('julia-version', version);
             // Search in cache
             let juliaPath;
             juliaPath = tc.find('julia', version, arch);
@@ -77,12 +77,9 @@ function run() {
             core.addPath(path.join(juliaPath, 'bin'));
             // Set output
             core.setOutput('julia-bindir', path.join(juliaPath, 'bin'));
-            // Test if Julia has been installed
-            exec.exec('julia', ['--version']);
-            // If enabled, also show the full version info
-            if (core.getInput('show-versioninfo') == 'true') {
-                exec.exec('julia', ['-e', 'using InteractiveUtils; versioninfo()']);
-            }
+            // Test if Julia has been installed and print the version
+            const showVersionInfoInput = core.getInput('show-versioninfo');
+            yield installer.showVersionInfo(showVersionInfoInput, version);
         }
         catch (error) {
             core.setFailed(error.message);

package.json

@@ -1,6 +1,6 @@
 {
   "name": "setup-julia",
-  "version": "1.4.1",
+  "version": "1.7.1",
   "private": true,
   "description": "setup Julia action",
   "main": "lib/setup-julia.js",
@@ -25,9 +25,11 @@
     "@actions/exec": "^1.0.0",
     "@actions/io": "^1.0.0",
     "@actions/tool-cache": "^1.0.0",
+    "async-retry": "^1.3.1",
     "semver": "^6.3.0"
   },
   "devDependencies": {
+    "@types/async-retry": "^1.4.2",
     "@types/jest": "^24.0.13",
     "@types/node": "^12.12.7",
     "@types/semver": "^6.0.0",

src/installer.ts

@@ -6,6 +6,7 @@ import * as crypto from 'crypto'
 import * as fs from 'fs'
 import * as os from 'os'
 import * as path from 'path'
+import retry = require('async-retry')
 
 import * as semver from 'semver'
 
@@ -17,7 +18,8 @@ const osMap = {
 }
 const archMap = {
     'x86': 'i686',
-    'x64': 'x86_64'
+    'x64': 'x86_64',
+    'aarch64': 'aarch64'
 }
 
 // Store information about the environment
@@ -47,7 +49,15 @@ async function calculateChecksum(file: string): Promise<string> {
  * @returns The content of the downloaded versions.json file as object.
  */
 export async function getJuliaVersionInfo(): Promise<object> {
-    const versionsFile = await tc.downloadTool('https://julialang-s3.julialang.org/bin/versions.json')
+    // Occasionally the connection is reset for unknown reasons
+    // In those cases, retry the download
+    const versionsFile = await retry(async (bail: Function) => {
+        return await tc.downloadTool('https://julialang-s3.julialang.org/bin/versions.json')
+    }, {
+        onRetry: (err: Error) => {
+            core.debug(`Download of versions.json failed, trying again. Error: ${err}`)
+        }
+    })
 
     return JSON.parse(fs.readFileSync(versionsFile).toString())
 }
@@ -66,16 +76,11 @@ export async function getJuliaVersions(versionInfo): Promise<string[]> {
 }
 
 export function getJuliaVersion(availableReleases: string[], versionInput: string): string {
-    if (semver.valid(versionInput) == versionInput) {
-        // versionInput is a valid version, use it directly
+    if (semver.valid(versionInput) == versionInput || versionInput.endsWith('nightly')) {
+        // versionInput is a valid version or a nightly version, use it directly
         return versionInput
     }
 
-    // nightlies
-    if (versionInput == 'nightly') {
-        return 'nightly'
-    }
-
     // Use the highest available version that matches versionInput
     let version = semver.maxSatisfying(availableReleases, versionInput)
     if (version == null) {
@@ -111,26 +116,43 @@ function getNightlyFileName(arch: string): string {
 }
 
 export function getFileInfo(versionInfo, version: string, arch: string) {
-    if (version == 'nightly') {
+    const err = `Could not find ${archMap[arch]}/${version} binaries`
+
+    if (version.endsWith('nightly')) {
         return null
     }
 
+    if (!versionInfo[version]) {
+       throw err
+    }
+
     for (let file of versionInfo[version].files) {
         if (file.os == osMap[osPlat] && file.arch == archMap[arch]) {
             return file
         }
     }
 
-    throw `Could not find ${archMap[arch]}/${version} binaries`
+    throw err
 }
 
 export function getDownloadURL(fileInfo, version: string, arch: string): string {
-    // nightlies
-    if (version == 'nightly') {
-        const baseURL = 'https://julialangnightlies-s3.julialang.org/bin'
-        return `${baseURL}/${osMap[osPlat]}/${arch}/${getNightlyFileName(arch)}`
+    const baseURL = `https://julialangnightlies-s3.julialang.org/bin/${osMap[osPlat]}/${arch}`
+
+    // release branch nightlies, e.g. 1.6-nightlies should return .../bin/linux/x64/1.6/julia-latest-linux64.tar.gz
+    const majorMinorMatches = /^(\d*.\d*)-nightly/.exec(version)
+    if (majorMinorMatches) {
+        return `${baseURL}/${majorMinorMatches[1]}/${getNightlyFileName(arch)}`
     }
 
+    // nightlies
+    if (version == 'nightly') {
+        return `${baseURL}/${getNightlyFileName(arch)}`
+    }
+
+    // Verify that fileInfo.url points at the official Julia download servers
+    if (!fileInfo.url.startsWith('https://julialang-s3.julialang.org/')) {
+        throw new Error(`versions.json points at a download location outside of Julia's download server: ${fileInfo.url}. Aborting for security reasons.`)
+    }
     return fileInfo.url
 }
 
@@ -139,10 +161,20 @@ export async function installJulia(versionInfo, version: string, arch: string):
     const fileInfo = getFileInfo(versionInfo, version, arch)
     const downloadURL = getDownloadURL(fileInfo, version, arch)
     core.debug(`downloading Julia from ${downloadURL}`)
-    const juliaDownloadPath = await tc.downloadTool(downloadURL)
+
+    // Occasionally the connection is reset for unknown reasons
+    // In those cases, retry the download
+    const juliaDownloadPath = await retry(async (bail: Function) => {
+        return await tc.downloadTool(downloadURL)
+    }, {
+        onRetry: (err: Error) => {
+            core.debug(`Download of ${downloadURL} failed, trying again. Error: ${err}`)
+        }
+    })
+
 
     // Verify checksum
-    if (version != 'nightly') {
+    if (!version.endsWith('nightly')) {
         const checkSum = await calculateChecksum(juliaDownloadPath)
         if (fileInfo.sha256 != checkSum) {
             throw new Error(`Checksum of downloaded file does not match the expected checksum from versions.json.\nExpected: ${fileInfo.sha256}\nGot: ${checkSum}`)
@@ -161,7 +193,7 @@ export async function installJulia(versionInfo, version: string, arch: string):
             await exec.exec('tar', ['xf', juliaDownloadPath, '--strip-components=1', '-C', tempInstallDir])
             return tempInstallDir
         case 'win32':
-            if (version == 'nightly' || semver.gtr(version, '1.3', {includePrerelease: true})) {
+            if (version.endsWith('nightly') || semver.gtr(version, '1.3', {includePrerelease: true})) {
                 // The installer changed in 1.4: https://github.com/JuliaLang/julia/blob/ef0c9108b12f3ae177c51037934351ffa703b0b5/NEWS.md#build-system-changes
                 await exec.exec('powershell', ['-Command', `Start-Process -FilePath ${juliaDownloadPath} -ArgumentList "/SILENT /dir=${path.join(process.cwd(), tempInstallDir)}" -NoNewWindow -Wait`])
             } else {
@@ -176,3 +208,42 @@ export async function installJulia(versionInfo, version: string, arch: string):
             throw new Error(`Platform ${osPlat} is not supported`)
     }
 }
+
+/**
+ * Test if Julia has been installed and print the version.
+ *
+ * true => always show versioninfo
+ * false => only show on nightlies
+ * never => never show it anywhere
+ *
+ * @param showVersionInfoInput
+ */
+export async function showVersionInfo(showVersionInfoInput: string, version: string): Promise<void> {
+    // --compile=min -O0 reduces the time from ~1.8-1.9s to ~0.8-0.9s
+    let exitCode: number
+
+    switch (showVersionInfoInput) {
+        case 'true':
+            exitCode = await exec.exec('julia', ['--compile=min', '-O0', '-e', 'using InteractiveUtils; versioninfo()'])
+            break
+
+        case 'false':
+            if (version.endsWith('nightly')) {
+                exitCode = await exec.exec('julia', ['--compile=min', '-O0', '-e', 'using InteractiveUtils; versioninfo()'])
+            } else {
+                exitCode = await exec.exec('julia', ['--version'])
+            }
+            break
+
+        case 'never':
+            exitCode = await exec.exec('julia', ['--version'])
+            break
+
+        default:
+            throw new Error(`${showVersionInfoInput} is not a valid value for show-versioninfo. Supported values: true | false | never`)
+    }
+
+    if (exitCode !== 0) {
+        throw new Error(`Julia could not be installed properly. Exit code: ${exitCode}`)
+    }
+}

src/setup-julia.ts

@@ -48,6 +48,7 @@ async function run() {
         const availableReleases = await installer.getJuliaVersions(versionInfo)
         const version = installer.getJuliaVersion(availableReleases, versionInput)
         core.debug(`selected Julia version: ${arch}/${version}`)
+        core.setOutput('julia-version', version)
 
         // Search in cache
         let juliaPath: string;
@@ -72,14 +73,10 @@ async function run() {
 
         // Set output
         core.setOutput('julia-bindir', path.join(juliaPath, 'bin'))
-        
-        // Test if Julia has been installed
-        exec.exec('julia', ['--version'])
 
-        // If enabled, also show the full version info
-        if (core.getInput('show-versioninfo') == 'true') {
-            exec.exec('julia', ['-e', 'using InteractiveUtils; versioninfo()'])
-        }
+        // Test if Julia has been installed and print the version
+        const showVersionInfoInput = core.getInput('show-versioninfo')
+        await installer.showVersionInfo(showVersionInfoInput, version)
     } catch (error) {
         core.setFailed(error.message)
     }