Add support for rc and beta versions in go.mod file

The regex in `parseGoVersionFile()` didn't consider rc and beta
versions. The regex has been extended.

In `findMatch()` the match is checked using `semver.satisfies()`. But
`semver.satisfies()` doesn't no about Go's non-semver rc and beta
version formats (1.16c1 instead of 1.16.0-rc.1).

We cannot use `makeSemver()` on `versionSpec` and compare the result
using `semver.satisfies()` because `versionSpec` could be, well, a
spec. Instead we first check if there is a strict match between the
candidate version and the versionSpec.

Fixes #525.

__tests__/data/golang-dl.json

@@ -1,4 +1,181 @@
 [
+    {
+     "version": "go1.18beta2",
+     "stable": false,
+     "files": [
+      {
+       "filename": "go1.18beta2.src.tar.gz",
+        "os": "",
+        "arch": "",
+        "version": "go1.18beta2",
+        "sha256": "3cb14e2c82da366f7393c988f1f3fc2c16b71a5492bd3d49d35886cdf27a9d13",
+         "size": 22816245,
+        "kind": "source"
+      },
+      {
+       "filename": "go1.18beta2.darwin-amd64.tar.gz",
+       "os": "darwin",
+       "arch": "amd64",
+       "version": "go1.18beta2",
+       "sha256": "83fa94b3101d1a00dc5685645e4b49809a5dad18ce19ab449392806a85c05125",
+       "size": 143466224,
+       "kind": "archive"
+      },
+      {
+       "filename": "go1.18beta2.darwin-amd64.pkg",
+       "os": "darwin",
+       "arch": "amd64",
+       "version": "go1.18beta2",
+       "sha256": "fcab5fbe2b9a78bd677c008914df4ee1079178e1c96592b85fa0bd04e2e8e099",
+       "size": 143951639,
+       "kind": "installer"
+      },
+      {
+       "filename": "go1.18beta2.darwin-arm64.tar.gz",
+       "os": "darwin",
+       "arch": "arm64",
+       "version": "go1.18beta2",
+       "sha256": "b442585cbd50759bd11d7a9971e02ec3b2e8cfc1ff1094fa23afadc9e3889689",
+       "size": 137682754,
+       "kind": "archive"
+      },
+      {
+       "filename": "go1.18beta2.darwin-arm64.pkg",
+       "os": "darwin",
+       "arch": "arm64",
+       "version": "go1.18beta2",
+       "sha256": "61425e05dfffce91066bf3625d945baa377c13c659b4ca6fded39bcb391ef2c7",
+       "size": 138172943,
+       "kind": "installer"
+      },
+      {
+       "filename": "go1.18beta2.freebsd-386.tar.gz",
+       "os": "freebsd",
+       "arch": "386",
+       "version": "go1.18beta2",
+       "sha256": "f45899dcc440c9943b3af11a2856959e1ffd9fb11d0dbdbe6398615a96715751",
+       "size": 112424968,
+       "kind": "archive"
+      },
+      {
+       "filename": "go1.18beta2.freebsd-amd64.tar.gz",
+       "os": "freebsd",
+       "arch": "amd64",
+       "version": "go1.18beta2",
+       "sha256": "f5688d21a0e02991445b7992f01fc5fda459c84a1812b3b08c2ada4a98e74b5e",
+       "size": 141351456,
+       "kind": "archive"
+      },
+      {
+       "filename": "go1.18beta2.linux-386.tar.gz",
+       "os": "linux",
+       "arch": "386",
+       "version": "go1.18beta2",
+       "sha256": "74ac524d7d17df606cc74059bf30efce35bb6930f950110dd79cc58ba057f186",
+       "size": 112609338,
+       "kind": "archive"
+      },
+      {
+       "filename": "go1.18beta2.linux-amd64.tar.gz",
+       "os": "linux",
+       "arch": "amd64",
+       "version": "go1.18beta2",
+       "sha256": "b5dacafa59737cfb0d657902b70c2ad1b6bb4ed15e85ea2806f72ce3d4824688",
+       "size": 141429704,
+       "kind": "archive"
+      },
+      {
+       "filename": "go1.18beta2.linux-arm64.tar.gz",
+       "os": "linux",
+       "arch": "arm64",
+       "version": "go1.18beta2",
+       "sha256": "21e4248594401568c2e8704b9d26c6185a61f46b4f17e1a628bf1b5d9a010503",
+       "size": 108461508,
+       "kind": "archive"
+      },
+      {
+       "filename": "go1.18beta2.linux-armv6l.tar.gz",
+       "os": "linux",
+       "arch": "armv6l",
+       "version": "go1.18beta2",
+       "sha256": "bc958a63b51c44762ec026ab587b0261e94cf6337613bfbbcfbd0414fb95f7b6",
+       "size": 109806288,
+       "kind": "archive"
+      },
+      {
+       "filename": "go1.18beta2.linux-ppc64le.tar.gz",
+       "os": "linux",
+       "arch": "ppc64le",
+       "version": "go1.18beta2",
+       "sha256": "573916974201745360883102c80482e1d6730683d1a4a6bb4b469978d4f99d30",
+       "size": 108654946,
+       "kind": "archive"
+      },
+      {
+       "filename": "go1.18beta2.linux-s390x.tar.gz",
+       "os": "linux",
+       "arch": "s390x",
+       "version": "go1.18beta2",
+       "sha256": "860ee3e5cd68fd36d3d49654adc37b9450584d07f0745f7f461080d9cc7749e1",
+       "size": 111316368,
+       "kind": "archive"
+      },
+      {
+       "filename": "go1.18beta2.windows-386.zip",
+       "os": "windows",
+       "arch": "386",
+       "version": "go1.18beta2",
+       "sha256": "666b808f6835f928aa9d8ffa065304af61540b579b4d0eb5c55b7f2a7ec9fff2",
+       "size": 128931729,
+       "kind": "archive"
+      },
+      {
+       "filename": "go1.18beta2.windows-386.msi",
+       "os": "windows",
+       "arch": "386",
+       "version": "go1.18beta2",
+       "sha256": "b3ea5bb064c87e47871488cd15bc99ebd0919529acc97a684e44ef683e459acb",
+       "size": 113459200,
+       "kind": "installer"
+      },
+      {
+       "filename": "go1.18beta2.windows-amd64.zip",
+       "os": "windows",
+       "arch": "amd64",
+       "version": "go1.18beta2",
+       "sha256": "e2a3e0ee984205be36d59f333a7e327ab14517b7c3a11d9b8651e02895ced69a",
+       "size": 157785083,
+       "kind": "archive"
+      },
+      {
+       "filename": "go1.18beta2.windows-amd64.msi",
+       "os": "windows",
+       "arch": "amd64",
+       "version": "go1.18beta2",
+       "sha256": "36df8cad76eff69033b748cf71343c8d3f73b72067d57be52ec4996eb05539e4",
+       "size": 138551296,
+       "kind": "installer"
+      },
+      {
+       "filename": "go1.18beta2.windows-arm64.zip",
+       "os": "windows",
+       "arch": "arm64",
+       "version": "go1.18beta2",
+       "sha256": "9ed027803361cab0b8c338e698e16586d83d973f01815e17d2ab2990e29b8c66",
+       "size": 123458965,
+       "kind": "archive"
+      },
+      {
+       "filename": "go1.18beta2.windows-arm64.msi",
+       "os": "windows",
+       "arch": "arm64",
+       "version": "go1.18beta2",
+       "sha256": "cfbe500daed74dd26e556619a9f0e0b3d20f8a4cf31b48618c4285f47dca1f0c",
+       "size": 108797952,
+       "kind": "installer"
+      }
+     ]
+    },
     {
      "version": "go1.13.7",
      "stable": true,

__tests__/setup-go.test.ts

@@ -252,11 +252,11 @@ describe('setup-go', () => {
     expect(fileName).toBe('go1.13.7.windows-386.zip');
   });
 
-  it('finds unstable pre-release version', async () => {
+  it('finds unstable release candidate', async () => {
     os.platform = 'linux';
     os.arch = 'x64';
 
-    // spec: 1.14, stable=false => go1.14rc1
+    // spec: 1.14.0-rc.1, stable=false => go1.14rc1
     const match: im.IGoVersion | undefined = await im.findMatch('1.14.0-rc.1');
     expect(match).toBeDefined();
     const version: string = match ? match.version : '';
@@ -265,6 +265,47 @@ describe('setup-go', () => {
     expect(fileName).toBe('go1.14rc1.linux-amd64.tar.gz');
   });
 
+  it('finds unstable beta version', async () => {
+    os.platform = 'linux';
+    os.arch = 'x64';
+
+    // spec: 1.18.0-beta.2, stable=false => go1.18beta2
+    const match: im.IGoVersion | undefined = await im.findMatch(
+      '1.18.0-beta.2'
+    );
+    expect(match).toBeDefined();
+    const version: string = match ? match.version : '';
+    expect(version).toBe('go1.18beta2');
+    const fileName = match ? match.files[0].filename : '';
+    expect(fileName).toBe('go1.18beta2.linux-amd64.tar.gz');
+  });
+
+  it('finds unstable release candidate (go version format)', async () => {
+    os.platform = 'linux';
+    os.arch = 'x64';
+
+    // spec: 1.14rc1, stable=false => go1.14rc1
+    const match: im.IGoVersion | undefined = await im.findMatch('1.14rc1');
+    expect(match).toBeDefined();
+    const version: string = match ? match.version : '';
+    expect(version).toBe('go1.14rc1');
+    const fileName = match ? match.files[0].filename : '';
+    expect(fileName).toBe('go1.14rc1.linux-amd64.tar.gz');
+  });
+
+  it('finds unstable beta version (go version format)', async () => {
+    os.platform = 'linux';
+    os.arch = 'x64';
+
+    // spec: 1.18beta2, stable=false => go1.18beta2
+    const match: im.IGoVersion | undefined = await im.findMatch('1.18beta2');
+    expect(match).toBeDefined();
+    const version: string = match ? match.version : '';
+    expect(version).toBe('go1.18beta2');
+    const fileName = match ? match.files[0].filename : '';
+    expect(fileName).toBe('go1.18beta2.linux-amd64.tar.gz');
+  });
+
   it('evaluates to stable with input as true', async () => {
     inputs['go-version'] = '1.13.0';
     inputs.stable = 'true';

dist/setup/index.js

@@ -94763,7 +94763,8 @@ function findMatch(versionSpec_1) {
             const candidate = candidates[i];
             const version = makeSemver(candidate.version);
             core.debug(`check ${version} satisfies ${versionSpec}`);
-            if (semver.satisfies(version, versionSpec)) {
+            if (candidate.version.replace(/^go/, '') === versionSpec ||
+                semver.satisfies(version, versionSpec)) {
                 goFile = candidate.files.find(file => {
                     core.debug(`${file.arch}===${archFilter} && ${file.os}===${platFilter}`);
                     return file.arch === archFilter && file.os === platFilter;
@@ -94831,7 +94832,7 @@ function parseGoVersionFile(versionFilePath) {
             }
         }
         // go directive: https://go.dev/ref/mod#go-mod-file-go
-        const matchGo = contents.match(/^go (\d+(\.\d+)*)/m);
+        const matchGo = contents.match(/^go (\d+(\.\d+)*(?:\.\d+|(beta|rc)\d+)?)/m);
         return matchGo ? matchGo[1] : '';
     }
     else if (path.basename(versionFilePath) === '.tool-versions') {

src/installer.ts

@@ -423,7 +423,10 @@ export async function findMatch(
     const version = makeSemver(candidate.version);
 
     core.debug(`check ${version} satisfies ${versionSpec}`);
-    if (semver.satisfies(version, versionSpec)) {
+    if (
+      candidate.version.replace(/^go/, '') === versionSpec ||
+      semver.satisfies(version, versionSpec)
+    ) {
       goFile = candidate.files.find(file => {
         core.debug(
           `${file.arch}===${archFilter} && ${file.os}===${platFilter}`
@@ -511,7 +514,7 @@ export function parseGoVersionFile(versionFilePath: string): string {
     }
 
     // go directive: https://go.dev/ref/mod#go-mod-file-go
-    const matchGo = contents.match(/^go (\d+(\.\d+)*)/m);
+    const matchGo = contents.match(/^go (\d+(\.\d+)*(?:\.\d+|(beta|rc)\d+)?)/m);
     return matchGo ? matchGo[1] : '';
   } else if (path.basename(versionFilePath) === '.tool-versions') {
     const match = contents.match(/^golang\s+([^\n#]+)/m);