Automatic releases that handle --version

.github/workflows/release.yml

@@ -0,0 +1,37 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+
+  release:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Set up Go
+      uses: actions/setup-go@v3
+
+    - run: mkdir _publish
+
+    - name: Build for linux/amd64
+      run: go build -v -ldflags "-X main.version=${{github.ref_name}}" -o _publish/pgperms-linux-amd64 ./cmd/pgperms/
+      env:
+        CGO_ENABLED: 0
+        GOARCH: amd64
+
+    - name: Build for linux/arm64
+      run: go build -v -ldflags "-X main.version=${{github.ref_name}}" -o _publish/pgperms-linux-arm64 ./cmd/pgperms/
+      env:
+        CGO_ENABLED: 0
+        GOARCH: arm64
+
+    - name: Release
+      uses: softprops/action-gh-release@v1
+      with:
+        files: _publish/*
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

cmd/pgperms/cli.go

@@ -14,10 +14,22 @@ import (
 
 var (
 	dump = pflag.Bool("dump", false, "Whether to dump the current permissions")
+	showVersion = pflag.Bool("version", false, "Dump the version and exit")
+
+	// Injected by releaser
+	version string
 )
 
 func main() {
 	pflag.Parse()
+	if *showVersion {
+		if version != "" {
+			fmt.Fprintf(os.Stderr, "pgperms version %s\n", version)
+		} else {
+			fmt.Fprintf(os.Stderr, "pgperms built without versioning information\n")
+		}
+		return
+	}
 	ctx := context.Background()
 	conn, err := pgx.Connect(ctx, os.Getenv("DSN"))
 	if err != nil {