add dist

* Support the special version "MIN"

* Support JULIA_PROJECT

* Add tests

* Add forgotten test fixtures

* Get latest prerelease/release

* No special pre-release behaviour

* Add test for NPM semver difference

* Robust test suite

* Disallow less-than-equal

* Refactor validJuliaCompatRange to return a validRange

* Rename MIN to min

* Rename getProjectFile to getProjectFilePath

* Comment on "project" input

* Additional tests for getProjectFilePath

* Add comment on `juliaCompatRange`

Co-authored-by: Dilum Aluthge <dilum@aluthge.com>

* Update dependencies

---------

Co-authored-by: Dilum Aluthge <dilum@aluthge.com>

.github/workflows/checkin.yml

@@ -16,7 +16,7 @@ jobs:
 
     - uses: actions/setup-node@v4
       with:
-        node-version: 20
+        node-version-file: '.tool-versions'
 
     - name: "npm ci"
       run: npm ci
@@ -31,6 +31,6 @@ jobs:
       # Ensure no changes, but ignore node_modules dir since dev/fresh ci deps installed.
       run: |
         git diff --exit-code --stat -- . ':!node_modules' \
-        || (echo "##[error] found changed files after build. please 'npm run build && npm run format'" \
+        || (echo "##[error] found changed files after build. please 'npm ci && npm run build'" \
                  "and check in all changes" \
             && exit 1)

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

@@ -28,7 +28,7 @@ jobs:
       - uses: actions/setup-node@v4
         if: ${{ ! startsWith(github.ref, 'refs/heads/releases') }}
         with:
-          node-version: 16
+          node-version-file: '.tool-versions'
 
       - name: "Install dependencies"
         if: ${{ ! startsWith(github.ref, 'refs/heads/releases') }}

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

@@ -34,7 +34,7 @@ jobs:
       - uses: actions/setup-node@v4
         if: ${{ ! startsWith(github.ref, 'refs/heads/releases') }}
         with:
-          node-version: 16
+          node-version-file: '.tool-versions'
 
       - name: "Install dependencies"
         if: ${{ ! startsWith(github.ref, 'refs/heads/releases') }}

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

@@ -34,7 +34,7 @@ jobs:
       - uses: actions/setup-node@v4
         if: ${{ ! startsWith(github.ref, 'refs/heads/releases') }}
         with:
-          node-version: 16
+          node-version-file: '.tool-versions'
 
       - name: "Install dependencies"
         if: ${{ ! startsWith(github.ref, 'refs/heads/releases') }}

.github/workflows/example-builds.yml

@@ -19,7 +19,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        julia-version: ['1.0.5', '1.2', '^1.5.0-beta1', '1']
+       # include '1.6' here to test info message about lts tag existing
+        julia-version: ['1.0.5', '1.2', '^1.5.0-beta1', '1', '1.6', 'lts', 'pre']
         julia-arch: [x64, x86]
         os: [ubuntu-latest, macOS-latest, windows-latest]
         # 32-bit Julia binaries are not available on macOS
@@ -33,7 +34,7 @@ jobs:
       - uses: actions/setup-node@v4
         if: ${{ ! startsWith(github.ref, 'refs/heads/releases') }}
         with:
-          node-version: 16
+          node-version-file: '.tool-versions'
 
       - name: "Install dependencies"
         if: ${{ ! startsWith(github.ref, 'refs/heads/releases') }}

.tool-versions

@@ -0,0 +1 @@
+nodejs 20.11.1

CONTRIBUTING.md

@@ -1,11 +1,3 @@
-# Dev docs / Contributing guide
+# Contributing
 
-## Building and tagging a release (requires write access)
+Please see the README in the [`devdocs/`](devdocs/) folder.
-
-1. Test your changes, merge into `master`.
-2. Checkout `master`.
-3. Bump the version number in [`package.json`](package.json).
-4. Run `./bin/build-release julia-actions/setup-julia` to create a release branch and build a release.
-5. Push the branch (**without tags**) and verify that CI is passing on it.
-6. Run `git push --tags --force` to update the tags.
-7. Create a release for the `vX.Y.Z` tag.

README.md

@@ -5,17 +5,25 @@
 This action sets up a Julia environment for use in actions by downloading a specified version of Julia and adding it to PATH.
 
 ## Table of Contents
-- [Table of Contents](#table-of-contents)
+- [setup-julia Action](#setup-julia-action)
-- [Usage](#usage)
+  - [Table of Contents](#table-of-contents)
-  - [Inputs](#inputs)
+  - [Usage](#usage)
-  - [Outputs](#outputs)
+    - [Inputs](#inputs)
-  - [Basic](#basic)
+    - [Outputs](#outputs)
-  - [Julia Versions](#julia-versions)
+    - [Basic](#basic)
-  - [Matrix Testing](#matrix-testing)
+    - [Julia Versions](#julia-versions)
-  - [versioninfo](#versioninfo)
+      - [Examples](#examples)
-- [Versioning](#versioning)
+      - [Prereleases](#prereleases)
-- [Debug logs](#debug-logs)
+      - [Recently released versions](#recently-released-versions)
-- [Third party information](#third-party-information)
+    - [Matrix Testing](#matrix-testing)
+      - [64-bit Julia only](#64-bit-julia-only)
+      - [32-bit Julia](#32-bit-julia)
+    - [versioninfo](#versioninfo)
+  - [Versioning](#versioning)
+  - [Using Dependabot version updates to keep your GitHub Actions up to date](#using-dependabot-version-updates-to-keep-your-github-actions-up-to-date)
+  - [Debug logs](#debug-logs)
+  - [Third party information](#third-party-information)
+  - [Contributing to this repo](#contributing-to-this-repo)
 
 ## Usage
 
@@ -30,7 +38,7 @@ This action sets up a Julia environment for use in actions by downloading a spec
     # 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`.
+    #          For example, `1.10` may be parsed as `1.1`.
     #
     # Default: '1'
     version: ''
@@ -63,6 +71,11 @@ This action sets up a Julia environment for use in actions by downloading a spec
     #
     # Default: false
     show-versioninfo: ''
+
+    # Set the path to the project directory or file to use when resolving some versions (e.g. `min`).
+    #
+    # Defaults to using JULIA_PROJECT if defined, otherwise '.'
+    project: ''
 ```
 
 ### Outputs
@@ -109,8 +122,11 @@ You can either specify specific Julia versions or version ranges. If you specify
 - `'~1.3.0-rc1'` is a **tilde** version range that includes pre-releases of `1.3.0` starting at `rc1`. It matches all versions `≥ 1.3.0-rc1` and `< 1.4.0`.
 - `'^1.3.0-0'` is a **caret** version range that includes _all_ pre-releases of `1.3.0`. 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 of `1.3.0`. It matches all versions `≥ 1.3.0-` and `< 1.4.0`.
+- `'lts'` will install the latest LTS build.
+- `'pre'` will install the latest prerelease build (RCs, betas, and alphas).
 - `'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.
+- `'min'` will install the earliest supported version of Julia compatible with the project. Especially useful in monorepos.
 
 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).
 
@@ -283,3 +299,7 @@ Note that when debug logs are enabled, a request will be sent to `https://httpbi
 ## Third party information
 Parts of this software have been derived from other open source software.
 See [THIRD_PARTY_NOTICE.md](THIRD_PARTY_NOTICE.md) for details.
+
+## Contributing to this repo
+
+Please see the README in the [`devdocs/`](devdocs/) folder.

__tests__/installer.test.ts

@@ -4,30 +4,30 @@
 import * as path from 'path'
 
 import * as io from '@actions/io'
-
-import nock = require('nock')
 import * as semver from 'semver'
 
+import nock = require('nock')
+
 const testVersions = [
-    '0.1.2',       '0.2.0',           '0.2.1',          '0.3.0',
+    '0.1.2',
-    '0.3.1',       '0.3.10',          '0.3.11',         '0.3.12',
+    '0.2.0', '0.2.1',
-    '0.3.2',       '0.3.3',           '0.3.4',          '0.3.5',
+    '0.3.0', '0.3.1', '0.3.10', '0.3.11', '0.3.12', '0.3.2', '0.3.3', '0.3.4', '0.3.5', '0.3.6', '0.3.7', '0.3.8', '0.3.9',
-    '0.3.6',       '0.3.7',           '0.3.8',          '0.3.9',
+    '0.4.0', '0.4.0-rc1', '0.4.0-rc2', '0.4.0-rc3', '0.4.0-rc4', '0.4.1', '0.4.2', '0.4.3', '0.4.4', '0.4.5', '0.4.6', '0.4.7',
-    '0.4.0',       '0.4.0-rc1',       '0.4.0-rc2',      '0.4.0-rc3',
+    '0.5.0', '0.5.0-rc0', '0.5.0-rc1', '0.5.0-rc2', '0.5.0-rc3', '0.5.0-rc4', '0.5.1', '0.5.2',
-    '0.4.0-rc4',   '0.4.1',           '0.4.2',          '0.4.3',
+    '0.6.0', '0.6.0-pre.alpha', '0.6.0-pre.beta', '0.6.0-rc1', '0.6.0-rc2', '0.6.0-rc3', '0.6.1', '0.6.2', '0.6.3', '0.6.4',
-    '0.4.4',       '0.4.5',           '0.4.6',          '0.4.7',
+    '0.7.0', '0.7.0-alpha', '0.7.0-beta', '0.7.0-beta2', '0.7.0-rc1', '0.7.0-rc2', '0.7.0-rc3',
-    '0.5.0',       '0.5.0-rc0',       '0.5.0-rc1',      '0.5.0-rc2',
+    '1.0.0', '1.0.0-rc1', '1.0.1', '1.0.2', '1.0.3', '1.0.4', '1.0.5',
-    '0.5.0-rc3',   '0.5.0-rc4',       '0.5.1',          '0.5.2',
+    '1.1.0', '1.1.0-rc1', '1.1.0-rc2', '1.1.1',
-    '0.6.0',       '0.6.0-pre.alpha', '0.6.0-pre.beta', '0.6.0-rc1',
+    '1.2.0', '1.2.0-rc1', '1.2.0-rc2', '1.2.0-rc3',
-    '0.6.0-rc2',   '0.6.0-rc3',       '0.6.1',          '0.6.2',
+    '1.3.0', '1.3.0-alpha', '1.3.0-rc1', '1.3.0-rc2', '1.3.0-rc3', '1.3.0-rc4', '1.3.0-rc5', '1.3.1',
-    '0.6.3',       '0.6.4',           '0.7.0',          '0.7.0-alpha',
+    '1.4.0', '1.4.0-rc1', '1.4.0-rc2', '1.4.1', '1.4.2',
-    '0.7.0-beta',  '0.7.0-beta2',     '0.7.0-rc1',      '0.7.0-rc2',
+    '1.5.0', '1.5.0-beta1', '1.5.0-rc1', '1.5.0-rc2', '1.5.1', '1.5.2', '1.5.3', '1.5.4',
-    '0.7.0-rc3',   '1.0.0',           '1.0.0-rc1',      '1.0.1',
+    '1.6.0', '1.6.0-beta1', '1.6.0-rc1', '1.6.0-rc2', '1.6.0-rc3', '1.6.1', '1.6.2', '1.6.3', '1.6.4', '1.6.5', '1.6.6', '1.6.7',
-    '1.0.2',       '1.0.3',           '1.0.4',          '1.0.5',
+    '1.7.0', '1.7.0-beta1', '1.7.0-beta2', '1.7.0-beta3', '1.7.0-beta4', '1.7.0-rc1', '1.7.0-rc2', '1.7.0-rc3', '1.7.1', '1.7.2', '1.7.3',
-    '1.1.0',       '1.1.0-rc1',       '1.1.0-rc2',      '1.1.1',
+    '1.8.0', '1.8.0-beta1', '1.8.0-beta2', '1.8.0-beta3', '1.8.0-rc1', '1.8.0-rc2', '1.8.0-rc3', '1.8.0-rc4', '1.8.1', '1.8.2', '1.8.3', '1.8.4', '1.8.5',
-    '1.2.0',       '1.2.0-rc1',       '1.2.0-rc2',      '1.2.0-rc3',
+    '1.9.0', '1.9.0-alpha1', '1.9.0-beta1', '1.9.0-beta2', '1.9.0-beta3', '1.9.0-beta4', '1.9.0-rc1', '1.9.0-rc2', '1.9.0-rc3', '1.9.1', '1.9.2', '1.9.3', '1.9.4',
-    '1.3.0-alpha', '1.3.0-rc1',       '1.3.0-rc2',      '1.3.0-rc3',
+    '1.10.0', '1.10.0-alpha1', '1.10.0-beta1', '1.10.0-beta2', '1.10.0-beta3', '1.10.0-rc1', '1.10.0-rc2', '1.10.0-rc3', '1.10.1', '1.10.2',
-    '1.3.0-rc4'
+    '1.11.0-alpha1', '1.11.0-alpha2', '1.11.0-beta1'
 ]
 
 const toolDir = path.join(__dirname, 'runner', 'tools')
@@ -38,6 +38,135 @@ process.env['RUNNER_TOOL_CACHE'] = toolDir
 process.env['RUNNER_TEMP'] = tempDir
 
 import * as installer from '../src/installer'
+import exp from 'constants'
+
+describe("getProjectFilePath tests", () => {
+    let orgJuliaProject
+    let orgWorkingDir
+
+    beforeEach(() => {
+        orgJuliaProject = process.env["JULIA_PROJECT"]
+        orgWorkingDir = process.cwd()
+        delete process.env["JULIA_PROJECT"]
+    })
+
+    afterEach(() => {
+        process.env["JULIA_PROJECT"] = orgJuliaProject
+        process.chdir(orgWorkingDir)
+    })
+
+    it("Can determine project file is missing", () => {
+        expect(() => installer.getProjectFilePath("DNE.toml")).toThrow("Unable to locate project file")
+        expect(() => installer.getProjectFilePath(fixtureDir)).toThrow("Unable to locate project file")
+        expect(() => installer.getProjectFilePath()).toThrow("Unable to locate project file")
+    })
+
+    it('Can determine project file from a directory', () => {
+        expect(installer.getProjectFilePath(path.join(fixtureDir, "PkgA"))).toEqual(path.join(fixtureDir, "PkgA", "Project.toml"))
+        expect(installer.getProjectFilePath(path.join(fixtureDir, "PkgB"))).toEqual(path.join(fixtureDir, "PkgB", "JuliaProject.toml"))
+    })
+
+    it("Prefers using JuliaProject.toml over Project.toml", () => {
+        expect(installer.getProjectFilePath(path.join(fixtureDir, "PkgC"))).toEqual(path.join(fixtureDir, "PkgC", "JuliaProject.toml"))
+    })
+
+    it("Can determine project from JULIA_PROJECT", () => {
+        process.env["JULIA_PROJECT"] = path.join(fixtureDir, "PkgA")
+        expect(installer.getProjectFilePath()).toEqual(path.join(fixtureDir, "PkgA", "Project.toml"))
+    })
+
+    it("Can determine project from the current working directory", () => {
+        process.chdir(path.join(fixtureDir, "PkgA"));
+        expect(installer.getProjectFilePath()).toEqual("Project.toml")
+    })
+
+    it("Ignores JULIA_PROJECT when argument is used", () => {
+        process.env["JULIA_PROJECT"] = path.join(fixtureDir, "PkgB")
+        expect(installer.getProjectFilePath(path.join(fixtureDir, "PkgA"))).toEqual(path.join(fixtureDir, "PkgA", "Project.toml"))
+    })
+})
+
+describe("validJuliaCompatRange tests", () => {
+    it('Handles default caret specifier', () => {
+        expect(installer.validJuliaCompatRange("1")).toEqual(semver.validRange("^1"))
+        expect(installer.validJuliaCompatRange("1.2")).toEqual(semver.validRange("^1.2"))
+        expect(installer.validJuliaCompatRange("1.2.3")).toEqual(semver.validRange("^1.2.3"))
+
+        // TODO: Pkg.jl currently does not support pre-release entries in compat so ideally this would fail
+        expect(installer.validJuliaCompatRange("1.2.3-rc1")).toEqual(semver.validRange("^1.2.3-rc1"))
+    })
+
+    it('Handle surrounding whitespace', () => {
+        expect(installer.validJuliaCompatRange(" 1")).toEqual(semver.validRange("^1"))
+        expect(installer.validJuliaCompatRange("1 ")).toEqual(semver.validRange("^1"))
+        expect(installer.validJuliaCompatRange(" 1 ")).toEqual(semver.validRange("^1"))
+    })
+
+    it('Handles version ranges with specifiers', () => {
+        expect(installer.validJuliaCompatRange("^1.2.3")).toEqual(semver.validRange("^1.2.3"))
+        expect(installer.validJuliaCompatRange("~1.2.3")).toEqual(semver.validRange("~1.2.3"))
+        expect(installer.validJuliaCompatRange("=1.2.3")).toEqual(semver.validRange("=1.2.3"))
+        expect(installer.validJuliaCompatRange(">=1.2.3")).toEqual(">=1.2.3")
+        expect(installer.validJuliaCompatRange("≥1.2.3")).toEqual(">=1.2.3")
+        expect(installer.validJuliaCompatRange("<1.2.3")).toEqual("<1.2.3")
+    })
+
+    it('Handles whitespace after specifiers', () => {
+        expect(installer.validJuliaCompatRange("^ 1.2.3")).toBeNull()
+        expect(installer.validJuliaCompatRange("~ 1.2.3")).toBeNull()
+        expect(installer.validJuliaCompatRange("= 1.2.3")).toBeNull()
+        expect(installer.validJuliaCompatRange(">= 1.2.3")).toEqual(">=1.2.3")
+        expect(installer.validJuliaCompatRange("≥ 1.2.3")).toEqual(">=1.2.3")
+        expect(installer.validJuliaCompatRange("< 1.2.3")).toEqual("<1.2.3")
+    })
+
+    it('Handles hypen ranges', () => {
+        expect(installer.validJuliaCompatRange("1.2.3 - 4.5.6")).toEqual(semver.validRange("1.2.3 - 4.5.6"))
+        expect(installer.validJuliaCompatRange("1.2.3-rc1 - 4.5.6")).toEqual(semver.validRange("1.2.3-rc1 - 4.5.6"))
+        expect(installer.validJuliaCompatRange("1.2.3-rc1-4.5.6")).toEqual(semver.validRange("^1.2.3-rc1-4.5.6"))  // A version number and not a hypen range
+        expect(installer.validJuliaCompatRange("1.2.3-rc1 -4.5.6")).toBeNull()
+        expect(installer.validJuliaCompatRange("1.2.3-rc1- 4.5.6")).toBeNull()  // Whitespace separate version ranges
+    })
+
+    it("Returns null AND operator on version ranges", () => {
+        expect(installer.validJuliaCompatRange("")).toBeNull()
+        expect(installer.validJuliaCompatRange("1 2 3")).toBeNull()
+        expect(installer.validJuliaCompatRange("1- 2")).toBeNull()
+        expect(installer.validJuliaCompatRange("<1 <1")).toBeNull()
+        expect(installer.validJuliaCompatRange("< 1 < 1")).toBeNull()
+        expect(installer.validJuliaCompatRange("<  1 <  1")).toBeNull()
+    })
+
+    it('Returns null with invalid specifiers', () => {
+        expect(installer.validJuliaCompatRange("<=1.2.3")).toBeNull()
+        expect(installer.validJuliaCompatRange("≤1.2.3")).toBeNull()
+        expect(installer.validJuliaCompatRange("*")).toBeNull()
+    })
+
+    it("Handles OR operator on version ranges", () => {
+        expect(installer.validJuliaCompatRange("1, 2, 3")).toEqual(semver.validRange("^1 || ^2 || ^3"))
+        expect(installer.validJuliaCompatRange("1, 2 - 3, ≥ 4")).toEqual(semver.validRange("^1 || >=2 <=3 || >=4"))
+        expect(installer.validJuliaCompatRange(",")).toBeNull()
+    })
+})
+
+describe("readJuliaCompatRange tests", () => {
+    it('Can determine Julia compat entries', () => {
+        const toml = '[compat]\njulia = "1, ^1.1, ~1.2, >=1.3, 1.4 - 1.5"'
+        expect(installer.readJuliaCompatRange(toml)).toEqual(semver.validRange("^1 || ^1.1 || ~1.2 || >=1.3 || 1.4 - 1.5"))
+    })
+
+    it('Throws with invalid version ranges', () => {
+        expect(() => installer.readJuliaCompatRange('[compat]\njulia = ""')).toThrow("Invalid version range")
+        expect(() => installer.readJuliaCompatRange('[compat]\njulia = "1 2 3"')).toThrow("Invalid version range")
+    })
+
+    it('Handle missing compat entries', () => {
+        expect(installer.readJuliaCompatRange("")).toEqual("*")
+        expect(installer.readJuliaCompatRange("[compat]")).toEqual("*")
+
+    })
+})
 
 describe('version matching tests', () => {
     describe('specific versions', () => {
@@ -55,22 +184,33 @@ describe('version matching tests', () => {
             expect(installer.getJuliaVersion([], 'nightly')).toEqual('nightly')
             expect(installer.getJuliaVersion(testVersions, 'nightly')).toEqual('nightly')
         })
+
+        it('LTS', () => {
+            // Update test when LTS is updated
+            expect(installer.getJuliaVersion(testVersions, 'lts')).toEqual(installer.getJuliaVersion(testVersions, '1.6'))
+            expect(installer.getJuliaVersion(testVersions, 'lts')).toEqual('1.6.7')
+        })
+
+        it('pre', () => {
+            expect(installer.getJuliaVersion(testVersions, 'pre')).toEqual('1.11.0-beta1')
+        })
     })
 
     describe('version ranges', () => {
         it('Chooses the highest available version that matches the input', () => {
-            expect(installer.getJuliaVersion(testVersions, '1')).toEqual('1.2.0')
+            expect(installer.getJuliaVersion(testVersions, '1')).toEqual('1.10.2')
             expect(installer.getJuliaVersion(testVersions, '1.0')).toEqual('1.0.5')
-            expect(installer.getJuliaVersion(testVersions, '^1.3.0-rc1')).toEqual('1.3.0-rc4')
+            expect(installer.getJuliaVersion(testVersions, '^1.3.0-rc1')).toEqual('1.10.2')
-            expect(installer.getJuliaVersion(testVersions, '^1.2.0-rc1')).toEqual('1.2.0')
+            expect(installer.getJuliaVersion(testVersions, '^1.2.0-rc1')).toEqual('1.10.2')
+            expect(installer.getJuliaVersion(testVersions, '^1.10.0-rc1')).toEqual('1.10.2')
         })
     })
 
     describe('include-prereleases', () => {
         it('Chooses the highest available version that matches the input including prereleases', () => {
-            expect(installer.getJuliaVersion(testVersions, '^1.2.0-0', true)).toEqual('1.3.0-rc4')
+            expect(installer.getJuliaVersion(testVersions, '^1.2.0-0', true)).toEqual('1.11.0-beta1')
-            expect(installer.getJuliaVersion(testVersions, '1', true)).toEqual('1.3.0-rc4')
+            expect(installer.getJuliaVersion(testVersions, '1', true)).toEqual('1.11.0-beta1')
-            expect(installer.getJuliaVersion(testVersions, '^1.2.0-0', false)).toEqual('1.2.0')
+            expect(installer.getJuliaVersion(testVersions, '^1.2.0-0', false)).toEqual('1.10.2')
         })
     })
 
@@ -84,6 +224,34 @@ describe('version matching tests', () => {
             })
         })
     })
+
+    describe('julia compat versions', () => {
+        it('Understands "min"', () => {
+            let versions = ["1.6.7", "1.7.1-rc1", "1.7.1-rc2", "1.7.1", "1.7.2", "1.8.0"]
+            expect(installer.getJuliaVersion(versions, "min", false, "^1.7")).toEqual("1.7.1")
+            expect(installer.getJuliaVersion(versions, "min", true, "^1.7")).toEqual("1.7.1-rc1")
+
+            versions = ["1.6.7", "1.7.3-rc1", "1.7.3-rc2", "1.8.0"]
+            expect(installer.getJuliaVersion(versions, "min", false, "^1.7")).toEqual("1.8.0")
+            expect(installer.getJuliaVersion(versions, "min", true, "^1.7")).toEqual("1.7.3-rc1")
+
+            expect(installer.getJuliaVersion(versions, "min", false, "~1.7 || ~1.8 || ~1.9")).toEqual("1.8.0")
+            expect(installer.getJuliaVersion(versions, "min", true, "~1.7 || ~1.8 || ~1.9")).toEqual("1.7.3-rc1")
+            expect(installer.getJuliaVersion(versions, "min", false, "~1.8 || ~1.7 || ~1.9")).toEqual("1.8.0")
+            expect(installer.getJuliaVersion(versions, "min", true, "~1.8 || ~1.7 || ~1.9")).toEqual("1.7.3-rc1")
+
+            expect(installer.getJuliaVersion(versions, "min", false, "1.7 - 1.9")).toEqual("1.8.0")
+            expect(installer.getJuliaVersion(versions, "min", true, "1.7 - 1.9")).toEqual("1.7.3-rc1")
+
+            expect(installer.getJuliaVersion(versions, "min", true, "< 1.9.0")).toEqual("1.6.7")
+            expect(installer.getJuliaVersion(versions, "min", true, ">= 1.6.0")).toEqual("1.6.7")
+
+            // NPM's semver package treats "1.7" as "~1.7" instead of "^1.7" like Julia
+            expect(() => installer.getJuliaVersion(versions, "min", false, "1.7")).toThrow("Could not find a Julia version that matches")
+
+            expect(() => installer.getJuliaVersion(versions, "min", true, "")).toThrow("Julia project file does not specify a compat for Julia")
+        })
+    })
 })
 
 describe('installer tests', () => {

action.yml

@@ -3,7 +3,7 @@ description: 'Setup a Julia environment and add it to the PATH'
 author: 'Sascha Mann'
 inputs:
   version:
-    description: 'The Julia version to download (if necessary) and use. Example: 1.0.4'
+    description: 'The Julia version to download (if necessary) and use. Use a string input to avoid unwanted decimal conversion e.g. 1.10 without quotes will be interpreted as 1.1. Examples: "1", "1.10", "lts", "pre"'
     default: '1'
   include-all-prereleases:
     description: 'Include prereleases when matching the Julia version to available versions.'
@@ -12,11 +12,15 @@ inputs:
   arch:
     description: 'Architecture of the Julia binaries. Defaults to the architecture of the runner executing the job.'
     required: false
-    default: '${{ runner.arch }}'
+    default: 'default'
   show-versioninfo:
     description: 'Display InteractiveUtils.versioninfo() after installing'
     required: false
     default: 'false'
+  project:
+    description: 'The path to the project directory or file to use when resolving some versions (e.g. min)'
+    required: false
+    default: ''  # Special value which fallsback to using JULIA_PROJECT if defined, otherwise "."
 outputs:
   julia-version:
     description: 'The installed Julia version. May vary from the version input if a version range was given as input.'

devdocs/README.md

@@ -0,0 +1,7 @@
+# Devdocs for the `setup-julia` repo
+
+If you want to make a pull request to this repo, please read the following:
+1. [Local development](local_setup.md)
+
+If you have commit access to this repo, you may be interested in the following:
+1. [Making a new release of this action](making_a_new_release.md)

devdocs/local_setup.md

@@ -0,0 +1,47 @@
+# Local development
+
+## 1. Clone the repo
+
+```bash
+git clone git@github.com:julia-actions/setup-julia.git
+cd setup-julia
+```
+
+## 2. Install NodeJS
+
+### Unix, using `asdf` (recommended, but not required)
+
+First, make sure that you have installed [`asdf`](https://asdf-vm.com/) on your local machine.
+
+Then, `cd` to your clone of the repo and run the following commands:
+
+```bash
+asdf plugin add nodejs
+asdf install
+```
+
+This will use `asdf` to install the correct version of NodeJS.
+
+### Unix, but not using `asdf`
+
+Instead of using `asdf`, you can instead choose to install NodeJS manually.
+
+First, check the `.tool-versions` file in this repo, and see what version of NodeJS you need. Then, install that same version of NodejS on your local machine.
+
+### Windows
+
+`asdf` does not (currently) support Windows. So on Windows, you have to install NodeJS manually.
+
+First, check the `.tool-versions` file in this repo, and see what version of NodeJS you need. Then, install that same version of NodejS on your local machine.
+
+## 3. Working locally
+
+First, `cd` to your clone of the repo. Now you can run the following commands:
+
+```bash
+npm ci
+
+npm run build
+```
+
+When you are ready, you can commit your changes and push them to your PR.

devdocs/making_a_new_release.md

@@ -0,0 +1,128 @@
+# Making a new release of this action (requires commit access)
+
+If you have commit access to this repo, you can make a new release.
+
+Here are the instructions.
+
+## Step 1: Clone a fresh copy of the repo
+
+We intentionally work in a brand-new copy of the repo.
+
+```bash
+git clone git@github.com:julia-actions/setup-julia.git
+cd setup-julia
+git checkout master
+git submodule init
+git submodule update
+```
+
+## Step 2: Make sure you have the right version of NodeJS
+
+If you use [`asdf`](https://asdf-vm.com/), this is as simple as:
+
+```bash
+asdf plugin add nodejs
+asdf install
+```
+
+If you don't use `asdf`, then you need to:
+1. Open the `./tool-versions` file in the root of the repo.
+2. Make note of the NodeJS version listed in the `.tool-versions` file.
+3. Install that same version of NodeJS on your machine.
+4. Make sure that you are currently using that version of NodeJS (i.e. it is at the front of your PATH).
+
+## Step 3: Edit the `version` field in `package.json`
+
+```bash
+vim package.json
+
+# Edit the `version` number (should be line 2)
+# Save your changes in Vim. Then exit Vim.
+
+# For the remaining of this guide, let MAJOR.MINOR.PATCH refer
+# to the new version number that you set.
+
+git add package.json
+
+# No need to commit yet.
+# The release script will run `git commit`.
+```
+
+## Step 4: Remove the `dist/` line from the `.gitignore` file
+
+```bash
+vim .gitignore
+# Delete the line that says `dist/` (it should be line 3)
+# Save your changes in Vim. Then exit Vim.
+
+git add .gitignore
+
+# No need to commit yet.
+# The release script will run `git commit`.
+```
+
+## Step 5: Make sure you have the necessary dependencies
+
+The `build-release.sh` script requires the following dependencies:
+
+1. Bash
+2. `curl`
+3. `git`
+4. `jq`
+5. `sed`
+
+## Step 6: Run the `build-release.sh` script
+
+```bash
+ls -l bin/build-release.sh
+chmod +x bin/build-release.sh
+ls -l bin/build-release.sh
+
+./bin/build-release.sh julia-actions/setup-julia
+```
+
+Wait a minute or two. The script will build everything and will create a new release branch named `releases/vMAJOR.MINOR.PATCH`.
+
+## Step 7: Push ONLY the `releases/vMAJOR.MINOR.PATCH` branch
+
+Only push the `releases/` branch. Do NOT push any tags yet.
+
+```bash
+git push origin releases/vMAJOR.MINOR.PATCH
+```
+
+Now you need to go to https://github.com/julia-actions/setup-julia/tree/releases/vMAJOR.MINOR.PATCH and wait for CI to finish running.
+
+Do NOT proceed to the next step until CI is all green on the `releases/vMAJOR.MINOR.PATCH` branch.
+
+## Step 8: Push the tags (only after CI is all green)
+
+Once CI is all green on the `releases/vMAJOR.MINOR.PATCH` branch, you can push the tags.
+
+You need to force-push.
+
+```bash
+git push --tags --force
+```
+
+## Step 9: Use the GitHub web UI to create a new GitHub Release
+
+Go to https://github.com/julia-actions/setup-julia/releases  and create a new release for the now-existant `vMAJOR.MINOR.PATCH` tag using the GitHub web interface.
+
+## Step 10: Clean up your local repo
+
+```bash
+git submodule deinit --force .
+git submodule update --init
+git fetch --all --prune
+git checkout master
+git reset --hard origin/master
+```
+
+## Step 11: Delete your local repo
+
+```bash
+cd ..
+ls setup-julia
+rm -rf setup-julia
+```

devdocs/misc/misc_notes_for_committers.md

@@ -1,4 +1,4 @@
-# Contributors
+# Misc notes for contributors
 
 ### Checkin
 

lib/installer.js

@@ -32,7 +32,16 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
     });
 };
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.showVersionInfo = exports.installJulia = exports.getDownloadURL = exports.getFileInfo = exports.getJuliaVersion = exports.getJuliaVersions = exports.getJuliaVersionInfo = void 0;
+exports.getJuliaVersionInfo = getJuliaVersionInfo;
+exports.getJuliaVersions = getJuliaVersions;
+exports.getProjectFilePath = getProjectFilePath;
+exports.validJuliaCompatRange = validJuliaCompatRange;
+exports.readJuliaCompatRange = readJuliaCompatRange;
+exports.getJuliaVersion = getJuliaVersion;
+exports.getFileInfo = getFileInfo;
+exports.getDownloadURL = getDownloadURL;
+exports.installJulia = installJulia;
+exports.showVersionInfo = showVersionInfo;
 const core = __importStar(require("@actions/core"));
 const exec = __importStar(require("@actions/exec"));
 const tc = __importStar(require("@actions/tool-cache"));
@@ -42,6 +51,9 @@ const os = __importStar(require("os"));
 const path = __importStar(require("path"));
 const retry = require("async-retry");
 const semver = __importStar(require("semver"));
+const toml = __importStar(require("toml"));
+const LTS_VERSION = '1.6';
+const MAJOR_VERSION = '1'; // Could be deduced from versions.json
 // Translations between actions input and Julia arch names
 const osMap = {
     'win32': 'winnt',
@@ -92,7 +104,6 @@ function getJuliaVersionInfo() {
         return JSON.parse(fs.readFileSync(versionsFile).toString());
     });
 }
-exports.getJuliaVersionInfo = getJuliaVersionInfo;
 /**
  * @returns An array of all Julia versions available for download
  */
@@ -105,22 +116,112 @@ function getJuliaVersions(versionInfo) {
         return versions;
     });
 }
-exports.getJuliaVersions = getJuliaVersions;
+/**
-function getJuliaVersion(availableReleases, versionInput, includePrerelease = false) {
+ * @returns The path to the Julia project file
+ */
+function getProjectFilePath(projectInput = "") {
+    let projectFilePath = "";
+    // Default value for projectInput
+    if (!projectInput) {
+        projectInput = process.env.JULIA_PROJECT || ".";
+    }
+    if (fs.existsSync(projectInput) && fs.lstatSync(projectInput).isFile()) {
+        projectFilePath = projectInput;
+    }
+    else {
+        for (let projectFilename of ["JuliaProject.toml", "Project.toml"]) {
+            let p = path.join(projectInput, projectFilename);
+            if (fs.existsSync(p) && fs.lstatSync(p).isFile()) {
+                projectFilePath = p;
+                break;
+            }
+        }
+    }
+    if (!projectFilePath) {
+        throw new Error(`Unable to locate project file with project input: ${projectInput}`);
+    }
+    return projectFilePath;
+}
+/**
+ * @returns A valid NPM semver range from a Julia compat range or null if it's not valid
+ */
+function validJuliaCompatRange(compatRange) {
+    let ranges = [];
+    for (let range of compatRange.split(",")) {
+        range = range.trim();
+        // An empty range isn't supported by Julia
+        if (!range) {
+            return null;
+        }
+        // NPM's semver doesn't understand unicode characters such as `≥` so we'll convert to alternatives
+        range = range.replace("≥", ">=").replace("≤", "<=");
+        // Cleanup whitespace. Julia only allows whitespace between the specifier and version with certain specifiers
+        range = range.replace(/\s+/g, " ").replace(/(?<=(>|>=|≥|<)) (?=\d)/g, "");
+        if (!semver.validRange(range) || range.split(/(?<! -) (?!- )/).length > 1 || range.startsWith("<=") || range === "*") {
+            return null;
+        }
+        else if (range.search(/^\d/) === 0 && !range.includes(" ")) {
+            // Compat version is just a basic version number (e.g. 1.2.3). Since Julia's Pkg.jl's uses caret
+            // as the default specifier (e.g. `1.2.3 == ^1.2.3`) and NPM's semver uses tilde as the default
+            // specifier (e.g. `1.2.3 == 1.2.x == ~1.2.3`) we will introduce the caret specifier to ensure the
+            // orignal intent is respected.
+            // https://pkgdocs.julialang.org/v1/compatibility/#Version-specifier-format
+            // https://github.com/npm/node-semver#x-ranges-12x-1x-12-
+            range = "^" + range;
+        }
+        ranges.push(range);
+    }
+    return semver.validRange(ranges.join(" || "));
+}
+/**
+ * @returns An array of version ranges compatible with the Julia project
+ */
+function readJuliaCompatRange(projectFileContent) {
+    var _a;
+    let compatRange;
+    let meta = toml.parse(projectFileContent);
+    if (((_a = meta.compat) === null || _a === void 0 ? void 0 : _a.julia) !== undefined) {
+        compatRange = validJuliaCompatRange(meta.compat.julia);
+    }
+    else {
+        compatRange = "*";
+    }
+    if (!compatRange) {
+        throw new Error(`Invalid version range found in Julia compat: ${compatRange}`);
+    }
+    return compatRange;
+}
+function getJuliaVersion(availableReleases, versionInput, includePrerelease = false, juliaCompatRange = "") {
+    // Note: `juliaCompatRange` is ignored unless `versionInput` is `min`
+    let version;
     if (semver.valid(versionInput) == versionInput || versionInput.endsWith('nightly')) {
         // versionInput is a valid version or a nightly version, use it directly
-        return versionInput;
+        version = versionInput;
     }
-    // Use the highest available version that matches versionInput
+    else if (versionInput == "min") {
-    let version = semver.maxSatisfying(availableReleases, versionInput, { includePrerelease });
+        // Resolve "min" to the minimum supported Julia version compatible with the project file
-    if (version == null) {
+        if (!juliaCompatRange) {
+            throw new Error('Unable to use version "min" when the Julia project file does not specify a compat for Julia');
+        }
+        version = semver.minSatisfying(availableReleases, juliaCompatRange, { includePrerelease });
+    }
+    else if (versionInput == "lts") {
+        version = semver.maxSatisfying(availableReleases, LTS_VERSION, { includePrerelease: false });
+    }
+    else if (versionInput == "pre") {
+        version = semver.maxSatisfying(availableReleases, MAJOR_VERSION, { includePrerelease: true });
+    }
+    else {
+        // Use the highest available version that matches versionInput
+        version = semver.maxSatisfying(availableReleases, versionInput, { includePrerelease });
+    }
+    if (!version) {
         throw new Error(`Could not find a Julia version that matches ${versionInput}`);
     }
     // GitHub tags start with v, remove it
     version = version.replace(/^v/, '');
     return version;
 }
-exports.getJuliaVersion = getJuliaVersion;
 function getDesiredFileExts() {
     let fileExt1;
     let hasFileExt2;
@@ -206,6 +307,7 @@ function getFileInfo(versionInfo, version, arch) {
         return null;
     }
     if (!versionInfo[version]) {
+        core.error(`Encountered error: ${err}`);
         throw err;
     }
     for (let file of versionInfo[version].files) {
@@ -224,10 +326,35 @@ function getFileInfo(versionInfo, version, arch) {
                 }
             }
         }
+        // The following block is just to provide improved log messages in the CI logs.
+        // We specifically want to improve the case where someone is trying to install
+        // Julia 1.6 or 1.7 on Apple Silicon (aarch64) macOS.
+        {
+            const one_fileext_is_targz = (fileExt1 == "tar.gz") || (fileExt2 == "tar.gz");
+            const one_fileext_is_dmg = (fileExt1 == "dmg") || (fileExt2 == "dmg");
+            const one_fileext_is_targz_and_other_is_dmg = one_fileext_is_targz && one_fileext_is_dmg;
+            // We say that "this Julia version does NOT have native binaries for Apple Silicon"
+            // if and only if "this Julia version is < 1.8.0"
+            const this_julia_version_does_NOT_have_native_binaries_for_apple_silicon = semver.lt(version, '1.8.0');
+            const this_is_macos = osPlat == 'darwin';
+            if (this_is_macos && one_fileext_is_targz_and_other_is_dmg && this_julia_version_does_NOT_have_native_binaries_for_apple_silicon) {
+                const msg = `It looks like you are trying to install Julia 1.6 or 1.7 on ` +
+                    `the "macos-latest" runners.\n` +
+                    `"macos-latest" now resolves to "macos-14", which run on Apple ` +
+                    `Silicon (aarch64) macOS machines.\n` +
+                    `Unfortunately, Julia 1.6 and 1.7 do not have native binaries ` +
+                    `available for Apple Silicon macOS.\n` +
+                    `Therefore, it is not possible to install Julia with the current ` +
+                    `constraints.\n` +
+                    `For instructions on how to fix this error, please see the following Discourse post: ` +
+                    `https://discourse.julialang.org/t/how-to-fix-github-actions-ci-failures-with-julia-1-6-or-1-7-on-macos-latest-and-macos-14/117019`;
+                core.error(msg);
+            }
+        }
     }
+    core.error(`Encountered error: ${err}`);
     throw err;
 }
-exports.getFileInfo = getFileInfo;
 function getDownloadURL(fileInfo, version, arch) {
     const baseURL = `https://julialangnightlies-s3.julialang.org/bin/${osMap[osPlat]}/${arch}`;
     // release branch nightlies, e.g. 1.6-nightlies should return .../bin/linux/x64/1.6/julia-latest-linux64.tar.gz
@@ -245,7 +372,6 @@ function getDownloadURL(fileInfo, version, arch) {
     }
     return fileInfo.url;
 }
-exports.getDownloadURL = getDownloadURL;
 function installJulia(dest, versionInfo, version, arch) {
     return __awaiter(this, void 0, void 0, function* () {
         // Download Julia
@@ -313,7 +439,6 @@ function installJulia(dest, versionInfo, version, arch) {
         }
     });
 }
-exports.installJulia = installJulia;
 /**
  * Test if Julia has been installed and print the version.
  *
@@ -350,4 +475,3 @@ function showVersionInfo(showVersionInfoInput, version) {
         }
     });
 }
-exports.showVersionInfo = showVersionInfo;

lib/setup-julia.js

@@ -36,15 +36,17 @@ const core = __importStar(require("@actions/core"));
 const tc = __importStar(require("@actions/tool-cache"));
 const fs = __importStar(require("fs"));
 const https = __importStar(require("https"));
+const os = __importStar(require("os"));
 const path = __importStar(require("path"));
 const installer = __importStar(require("./installer"));
+// Note: before we index into this dict, we always first do `.toLowerCase()` on
+// the key.
+//
+// Therefore, this dict does not need to account for differences in case.
 const archSynonyms = {
     'x86': 'x86',
-    'X86': 'x86',
     'x64': 'x64',
-    'X64': 'x64',
     'aarch64': 'aarch64',
-    'ARM64': 'aarch64',
     'arm64': 'aarch64'
 };
 function run() {
@@ -65,25 +67,49 @@ function run() {
                     core.debug(`ERROR: Could not retrieve runner IP: ${err}`);
                 });
             }
-            // Inputs
+            // Inputs.
-            const versionInput = core.getInput('version');
+            // Note that we intentionally strip leading and lagging whitespace by using `.trim()`
-            const includePrereleases = core.getInput('include-all-prereleases') == 'true';
+            const versionInput = core.getInput('version').trim();
-            const originalArchInput = core.getInput('arch');
+            const includePrereleases = core.getInput('include-all-prereleases').trim() == 'true';
+            const originalArchInput = core.getInput('arch').trim();
+            const projectInput = core.getInput('project').trim(); // Julia project file
             // It can easily happen that, for example, a workflow file contains an input `version: ${{ matrix.julia-version }}`
             // while the strategy matrix only contains a key `${{ matrix.version }}`.
             // In that case, we want the action to fail, rather than trying to download julia from an URL that's missing parts and 404ing.
             // We _could_ fall back to the default but that means that builds silently do things differently than they're meant to, which
             // is worse than failing the build.
-            if (!versionInput) {
+            if (!versionInput) { // if `versionInput` is an empty string
                 throw new Error('Version input must not be null');
             }
-            if (!originalArchInput) {
+            if (versionInput == '1.6') {
+                core.notice('[setup-julia] If you are testing 1.6 as a Long Term Support (lts) version, consider using the new "lts" version specifier instead of "1.6" explicitly, which will automatically resolve the current lts.');
+            }
+            if (!originalArchInput) { // if `originalArchInput` is an empty string
                 throw new Error(`Arch input must not be null`);
             }
-            const arch = archSynonyms[originalArchInput];
+            let processedArchInput;
+            if (originalArchInput == "default") {
+                // If the user sets the `arch` input to `default`, then we use the
+                // architecture of the machine that we are running on.
+                processedArchInput = os.arch();
+                core.debug(`The "arch" input is "default", so we will use the machine arch: ${processedArchInput}`);
+            }
+            else {
+                processedArchInput = originalArchInput;
+            }
+            // Note: we convert the key `processedArchInput` to lower case
+            // before we index into the `archSynonyms` dict.
+            const arch = archSynonyms[processedArchInput.toLowerCase()];
+            core.debug(`Mapped the "arch" from ${processedArchInput} to ${arch}`);
+            // Determine the Julia compat ranges as specified by the Project.toml only for special versions that require them.
+            let juliaCompatRange = "";
+            if (versionInput === "min") {
+                const projectFilePath = installer.getProjectFilePath(projectInput);
+                juliaCompatRange = installer.readJuliaCompatRange(fs.readFileSync(projectFilePath).toString());
+            }
             const versionInfo = yield installer.getJuliaVersionInfo();
             const availableReleases = yield installer.getJuliaVersions(versionInfo);
-            const version = installer.getJuliaVersion(availableReleases, versionInput, includePrereleases);
+            const version = installer.getJuliaVersion(availableReleases, versionInput, includePrereleases, juliaCompatRange);
             core.debug(`selected Julia version: ${arch}/${version}`);
             core.setOutput('julia-version', version);
             // Search in cache

package.json

@@ -1,6 +1,6 @@
 {
   "name": "setup-julia",
-  "version": "2.1.0",
+  "version": "2.4.0",
   "private": true,
   "description": "setup Julia action",
   "main": "lib/setup-julia.js",
@@ -26,20 +26,21 @@
     "@actions/io": "^1.1.3",
     "@actions/tool-cache": "^2.0.1",
     "async-retry": "^1.3.3",
-    "semver": "^7.6.0"
+    "semver": "^7.6.3",
+    "toml": "^3.0.0"
   },
   "devDependencies": {
     "@types/async-retry": "^1.4.8",
     "@types/jest": "^29.5.12",
-    "@types/node": "^20.12.8",
+    "@types/node": "^22.5.1",
     "@types/retry": "^0.12.5",
     "@types/semver": "^7.5.8",
     "@vercel/ncc": "^0.38.1",
     "jest": "^29.7.0",
     "jest-circus": "^29.7.0",
     "nock": "^13.5.4",
-    "prettier": "^3.2.5",
+    "prettier": "^3.3.3",
-    "ts-jest": "^29.1.2",
+    "ts-jest": "^29.2.5",
-    "typescript": "^5.4.5"
+    "typescript": "^5.5.4"
   }
 }

src/installer.ts

@@ -9,6 +9,10 @@ import * as path from 'path'
 import retry = require('async-retry')
 
 import * as semver from 'semver'
+import * as toml from 'toml'
+
+const LTS_VERSION = '1.6'
+const MAJOR_VERSION = '1' // Could be deduced from versions.json
 
 // Translations between actions input and Julia arch names
 const osMap = {
@@ -76,15 +80,116 @@ export async function getJuliaVersions(versionInfo): Promise<string[]> {
     return versions
 }
 
-export function getJuliaVersion(availableReleases: string[], versionInput: string, includePrerelease: boolean = false): string {
+/**
-    if (semver.valid(versionInput) == versionInput || versionInput.endsWith('nightly')) {
+ * @returns The path to the Julia project file
-        // versionInput is a valid version or a nightly version, use it directly
+ */
-        return versionInput
+export function getProjectFilePath(projectInput: string = ""): string {
+    let projectFilePath: string = ""
+
+    // Default value for projectInput
+    if (!projectInput) {
+        projectInput = process.env.JULIA_PROJECT || "."
     }
 
-    // Use the highest available version that matches versionInput
+    if (fs.existsSync(projectInput) && fs.lstatSync(projectInput).isFile()) {
-    let version = semver.maxSatisfying(availableReleases, versionInput, {includePrerelease})
+        projectFilePath = projectInput
-    if (version == null) {
+    } else {
+        for (let projectFilename of ["JuliaProject.toml", "Project.toml"]) {
+            let p = path.join(projectInput, projectFilename)
+            if (fs.existsSync(p) && fs.lstatSync(p).isFile()) {
+                projectFilePath = p
+                break
+            }
+        }
+    }
+
+    if (!projectFilePath) {
+        throw new Error(`Unable to locate project file with project input: ${projectInput}`)
+    }
+
+    return projectFilePath
+}
+
+/**
+ * @returns A valid NPM semver range from a Julia compat range or null if it's not valid
+ */
+export function validJuliaCompatRange(compatRange: string): string | null {
+    let ranges: Array<string> = []
+    for(let range of compatRange.split(",")) {
+        range = range.trim()
+
+        // An empty range isn't supported by Julia
+        if (!range) {
+            return null
+        }
+
+        // NPM's semver doesn't understand unicode characters such as `≥` so we'll convert to alternatives
+        range = range.replace("≥", ">=").replace("≤", "<=")
+
+        // Cleanup whitespace. Julia only allows whitespace between the specifier and version with certain specifiers
+        range = range.replace(/\s+/g, " ").replace(/(?<=(>|>=|≥|<)) (?=\d)/g, "")
+
+        if (!semver.validRange(range) || range.split(/(?<! -) (?!- )/).length > 1 || range.startsWith("<=") || range === "*") {
+            return null
+        } else if (range.search(/^\d/) === 0 && !range.includes(" ")) {
+            // Compat version is just a basic version number (e.g. 1.2.3). Since Julia's Pkg.jl's uses caret
+            // as the default specifier (e.g. `1.2.3 == ^1.2.3`) and NPM's semver uses tilde as the default
+            // specifier (e.g. `1.2.3 == 1.2.x == ~1.2.3`) we will introduce the caret specifier to ensure the
+            // orignal intent is respected.
+            // https://pkgdocs.julialang.org/v1/compatibility/#Version-specifier-format
+            // https://github.com/npm/node-semver#x-ranges-12x-1x-12-
+            range = "^" + range
+        }
+
+        ranges.push(range)
+    }
+
+    return semver.validRange(ranges.join(" || "))
+}
+
+/**
+ * @returns An array of version ranges compatible with the Julia project
+ */
+export function readJuliaCompatRange(projectFileContent: string): string {
+    let compatRange: string | null
+    let meta = toml.parse(projectFileContent)
+
+    if (meta.compat?.julia !== undefined) {
+        compatRange = validJuliaCompatRange(meta.compat.julia)
+    } else {
+        compatRange = "*"
+    }
+
+    if (!compatRange) {
+        throw new Error(`Invalid version range found in Julia compat: ${compatRange}`)
+    }
+
+    return compatRange
+}
+
+export function getJuliaVersion(availableReleases: string[], versionInput: string, includePrerelease: boolean = false, juliaCompatRange: string = ""): string {
+    // Note: `juliaCompatRange` is ignored unless `versionInput` is `min`
+    let version: string | null
+
+    if (semver.valid(versionInput) == versionInput || versionInput.endsWith('nightly')) {
+        // versionInput is a valid version or a nightly version, use it directly
+        version = versionInput
+    } else if (versionInput == "min") {
+        // Resolve "min" to the minimum supported Julia version compatible with the project file
+        if (!juliaCompatRange) {
+            throw new Error('Unable to use version "min" when the Julia project file does not specify a compat for Julia')
+        }
+        version = semver.minSatisfying(availableReleases, juliaCompatRange, {includePrerelease})
+    } else if (versionInput == "lts") {
+        version = semver.maxSatisfying(availableReleases, LTS_VERSION, { includePrerelease: false });
+    } else if (versionInput == "pre") {
+        version = semver.maxSatisfying(availableReleases, MAJOR_VERSION, { includePrerelease: true });
+    } else {
+        // Use the highest available version that matches versionInput
+        version = semver.maxSatisfying(availableReleases, versionInput, {includePrerelease})
+    }
+
+    if (!version) {
         throw new Error(`Could not find a Julia version that matches ${versionInput}`)
     }
 
@@ -173,6 +278,7 @@ export function getFileInfo(versionInfo, version: string, arch: string) {
     }
 
     if (!versionInfo[version]) {
+       core.error(`Encountered error: ${err}`)
        throw err
     }
 
@@ -193,8 +299,39 @@ export function getFileInfo(versionInfo, version: string, arch: string) {
                 }
             }
         }
+
+        // The following block is just to provide improved log messages in the CI logs.
+        // We specifically want to improve the case where someone is trying to install
+        // Julia 1.6 or 1.7 on Apple Silicon (aarch64) macOS.
+        {
+            const one_fileext_is_targz = (fileExt1 == "tar.gz") || (fileExt2 == "tar.gz");
+            const one_fileext_is_dmg = (fileExt1 == "dmg") || (fileExt2 == "dmg");
+            const one_fileext_is_targz_and_other_is_dmg = one_fileext_is_targz && one_fileext_is_dmg;
+
+            // We say that "this Julia version does NOT have native binaries for Apple Silicon"
+            // if and only if "this Julia version is < 1.8.0"
+            const this_julia_version_does_NOT_have_native_binaries_for_apple_silicon = semver.lt(
+                version,
+                '1.8.0',
+            );
+            const this_is_macos = osPlat == 'darwin';
+            if (this_is_macos && one_fileext_is_targz_and_other_is_dmg && this_julia_version_does_NOT_have_native_binaries_for_apple_silicon) {
+                const msg = `It looks like you are trying to install Julia 1.6 or 1.7 on ` +
+                            `the "macos-latest" runners.\n` +
+                            `"macos-latest" now resolves to "macos-14", which run on Apple ` +
+                            `Silicon (aarch64) macOS machines.\n` +
+                            `Unfortunately, Julia 1.6 and 1.7 do not have native binaries ` +
+                            `available for Apple Silicon macOS.\n` +
+                            `Therefore, it is not possible to install Julia with the current ` +
+                            `constraints.\n` +
+                            `For instructions on how to fix this error, please see the following Discourse post: ` +
+                            `https://discourse.julialang.org/t/how-to-fix-github-actions-ci-failures-with-julia-1-6-or-1-7-on-macos-latest-and-macos-14/117019`
+                core.error(msg);
+            }
+        }
     }
 
+    core.error(`Encountered error: ${err}`)
     throw err
 }
 

src/setup-julia.ts

@@ -1,20 +1,21 @@
 import * as core from '@actions/core'
-import * as exec from '@actions/exec'
 import * as tc from '@actions/tool-cache'
 
 import * as fs from 'fs'
 import * as https from 'https'
+import * as os from 'os'
 import * as path from 'path'
 
 import * as installer from './installer'
 
+// Note: before we index into this dict, we always first do `.toLowerCase()` on
+// the key.
+//
+// Therefore, this dict does not need to account for differences in case.
 const archSynonyms = {
     'x86': 'x86',
-    'X86': 'x86',
     'x64': 'x64',
-    'X64': 'x64',
     'aarch64': 'aarch64',
-    'ARM64': 'aarch64',
     'arm64': 'aarch64'
 }
 
@@ -38,28 +39,52 @@ async function run() {
             })
         }
 
-        // Inputs
+        // Inputs.
-        const versionInput = core.getInput('version')
+        // Note that we intentionally strip leading and lagging whitespace by using `.trim()`
-        const includePrereleases = core.getInput('include-all-prereleases') == 'true'
+        const versionInput = core.getInput('version').trim()
-        const originalArchInput = core.getInput('arch')
+        const includePrereleases = core.getInput('include-all-prereleases').trim() == 'true'
+        const originalArchInput = core.getInput('arch').trim()
+        const projectInput = core.getInput('project').trim()  // Julia project file
 
         // It can easily happen that, for example, a workflow file contains an input `version: ${{ matrix.julia-version }}`
         // while the strategy matrix only contains a key `${{ matrix.version }}`.
         // In that case, we want the action to fail, rather than trying to download julia from an URL that's missing parts and 404ing.
         // We _could_ fall back to the default but that means that builds silently do things differently than they're meant to, which
         // is worse than failing the build.
-        if (!versionInput) {
+        if (!versionInput) { // if `versionInput` is an empty string
             throw new Error('Version input must not be null')
         }
-        if (!originalArchInput) {
+        if (versionInput == '1.6') {
+            core.notice('[setup-julia] If you are testing 1.6 as a Long Term Support (lts) version, consider using the new "lts" version specifier instead of "1.6" explicitly, which will automatically resolve the current lts.')
+        }
+        if (!originalArchInput) { // if `originalArchInput` is an empty string
             throw new Error(`Arch input must not be null`)
         }
 
-        const arch = archSynonyms[originalArchInput]
+        let processedArchInput: string;
+        if (originalArchInput == "default") {
+            // If the user sets the `arch` input to `default`, then we use the
+            // architecture of the machine that we are running on.
+            processedArchInput = os.arch();
+            core.debug(`The "arch" input is "default", so we will use the machine arch: ${processedArchInput}`)
+        } else {
+            processedArchInput = originalArchInput;
+        }
+        // Note: we convert the key `processedArchInput` to lower case
+        // before we index into the `archSynonyms` dict.
+        const arch = archSynonyms[processedArchInput.toLowerCase()]
+        core.debug(`Mapped the "arch" from ${processedArchInput} to ${arch}`)
+
+        // Determine the Julia compat ranges as specified by the Project.toml only for special versions that require them.
+        let juliaCompatRange: string = "";
+        if (versionInput === "min") {
+            const projectFilePath = installer.getProjectFilePath(projectInput)
+            juliaCompatRange = installer.readJuliaCompatRange(fs.readFileSync(projectFilePath).toString())
+        }
 
         const versionInfo = await installer.getJuliaVersionInfo()
         const availableReleases = await installer.getJuliaVersions(versionInfo)
-        const version = installer.getJuliaVersion(availableReleases, versionInput, includePrereleases)
+        const version = installer.getJuliaVersion(availableReleases, versionInput, includePrereleases, juliaCompatRange)
         core.debug(`selected Julia version: ${arch}/${version}`)
         core.setOutput('julia-version', version)