Add GoReleaser configuration and version command

cmd/version.go

@@ -0,0 +1,216 @@
+package cmd
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"regexp"
+	"runtime"
+	"strings"
+	"time"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	// Version is set during build
+	Version = "dev"
+
+	// BuildDate is set during build
+	BuildDate = ""
+
+	// For go install builds, this will be the go.mod version
+	versionFromMod = "$GOFLAGS: -ldflags=-X git.mvl.sh/vleeuwenmenno/sshtunnel/cmd.Version=${VERSION}"
+
+	checkForUpdates bool
+)
+
+var versionCmd = &cobra.Command{
+	Use:   "version",
+	Short: "Show sshtunnel version information",
+	Long:  `Display the current version of sshtunnel and check for updates.`,
+	Run: func(cmd *cobra.Command, args []string) {
+		// Display current version
+		showVersion()
+
+		// Check for updates if requested
+		if checkForUpdates {
+			checkUpdate()
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(versionCmd)
+	versionCmd.Flags().BoolVarP(&checkForUpdates, "check-updates", "c", false, "Check for updates")
+
+	// If version is still "dev", try to read from other sources
+	if Version == "dev" {
+		// Check if version was injected via go install's version info
+		if strings.Contains(versionFromMod, "${VERSION}") {
+			// Not replaced, try to read from the installed version file
+			Version = readInstalledVersion()
+		} else {
+			// Extract version from the injected string
+			re := regexp.MustCompile(`Version=(.+)$`)
+			matches := re.FindStringSubmatch(versionFromMod)
+			if len(matches) > 1 {
+				Version = matches[1]
+			} else {
+				// Fall back to reading from installed file
+				Version = readInstalledVersion()
+			}
+		}
+	}
+}
+
+func showVersion() {
+	fmt.Printf("sshtunnel %s\n", Version)
+	if BuildDate != "" {
+		fmt.Printf("Build date: %s\n", BuildDate)
+	}
+	fmt.Printf("Go version: %s\n", runtime.Version())
+	fmt.Printf("OS/Arch: %s/%s\n", runtime.GOOS, runtime.GOARCH)
+}
+
+func readInstalledVersion() string {
+	// Check system-installed version file first
+	versionFile := "/usr/local/share/sshtunnel/sshtunnel.version"
+	if _, err := os.Stat(versionFile); err == nil {
+		content, err := os.ReadFile(versionFile)
+		if err == nil {
+			return strings.TrimSpace(string(content))
+		}
+	}
+
+	// Try user's home directory for go install version
+	homeDir, err := os.UserHomeDir()
+	if err == nil {
+		goPath := filepath.Join(homeDir, "go", "pkg", "mod", "git.mvl.sh", "vleeuwenmenno", "sshtunnel@*")
+		matches, err := filepath.Glob(goPath)
+		if err == nil && len(matches) > 0 {
+			// Sort matches to get the latest version
+			// Example: .../sshtunnel@v1.0.0 -> extract v1.0.0
+			latestMatch := matches[len(matches)-1]
+			parts := strings.Split(filepath.Base(latestMatch), "@")
+			if len(parts) > 1 {
+				return parts[1]
+			}
+		}
+	}
+
+	// Check if executable name has version info
+	execPath, err := os.Executable()
+	if err == nil {
+		execName := filepath.Base(execPath)
+		if strings.Contains(execName, "sshtunnel-v") {
+			parts := strings.Split(execName, "-v")
+			if len(parts) > 1 {
+				return "v" + parts[1]
+			}
+		}
+		
+		// Check if it's in GOBIN with a version suffix
+		re := regexp.MustCompile(`sshtunnel@(v[0-9]+\.[0-9]+\.[0-9]+)$`)
+		matches := re.FindStringSubmatch(execName)
+		if len(matches) > 1 {
+			return matches[1]
+		}
+	}
+
+	// Default version if we couldn't find any version information
+	return "dev"
+}
+
+func checkUpdate() {
+	fmt.Println("\nChecking for updates...")
+	client := http.Client{
+		Timeout: 5 * time.Second,
+	}
+
+	resp, err := client.Get("https://git.mvl.sh/api/v1/repos/vleeuwenmenno/sshtunnel/tags")
+	if err != nil {
+		fmt.Printf("Error checking for updates: %s\n", err)
+		return
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		fmt.Printf("Error reading response: %s\n", err)
+		return
+	}
+
+	var tags []struct {
+		Name string `json:"name"`
+	}
+	if err := json.Unmarshal(body, &tags); err != nil {
+		fmt.Printf("Error parsing response: %s\n", err)
+		return
+	}
+
+	// Find the latest version tag
+	var latestTag string
+	for _, tag := range tags {
+		if strings.HasPrefix(tag.Name, "v") && (latestTag == "" || compareVersions(tag.Name, latestTag) > 0) {
+			latestTag = tag.Name
+		}
+	}
+
+	if latestTag == "" {
+		fmt.Println("No version tags found in the repository")
+		return
+	}
+
+	// Compare with current version
+	if compareVersions(latestTag, Version) > 0 {
+		fmt.Printf("A newer version is available: %s (you have %s)\n", latestTag, Version)
+		fmt.Println("To update, run: go install git.mvl.sh/vleeuwenmenno/sshtunnel@latest")
+	} else {
+		fmt.Println("You are running the latest version")
+	}
+}
+
+// compareVersions compares two semantic version strings (v1.2.3)
+// returns:  1 if v1 > v2
+//          -1 if v1 < v2
+//           0 if v1 == v2
+func compareVersions(v1, v2 string) int {
+	// Remove 'v' prefix if any
+	v1 = strings.TrimPrefix(v1, "v")
+	v2 = strings.TrimPrefix(v2, "v")
+
+	// Split into parts
+	parts1 := strings.Split(v1, ".")
+	parts2 := strings.Split(v2, ".")
+
+	// Compare each part
+	for i := 0; i < len(parts1) && i < len(parts2); i++ {
+		// Skip non-numeric parts (like pre-release suffixes)
+		num1 := 0
+		fmt.Sscanf(parts1[i], "%d", &num1)
+		
+		num2 := 0
+		fmt.Sscanf(parts2[i], "%d", &num2)
+
+		if num1 > num2 {
+			return 1
+		}
+		if num1 < num2 {
+			return -1
+		}
+	}
+
+	// If we get here, the common parts are equal
+	if len(parts1) > len(parts2) {
+		return 1
+	}
+	if len(parts1) < len(parts2) {
+		return -1
+	}
+
+	return 0
+}