[devbox] Add version command (#2652)

## Summary
Add `devbox version`. It prints the version that is set via ldflags (via
goreleaser). I tried to make BuildInfo work ... but couldn't. I think
for now ldflags are more reliable. That said, I restricted the ldflags
to the same subset that we'll get via BuildInfo) so it should later be
easy to switch between them.

## How was it tested?
Built locally and ran.

## Is this change backwards-compatible?
Yes.

.goreleaser.yaml

@@ -7,7 +7,9 @@ builds:
     binary: devbox
     mod_timestamp: "{{ .CommitTimestamp }}" # For reproducible builds
     ldflags:
-      - -s -w -X main.version={{.Version}} -X main.commit={{.Commit}} -X main.date={{.CommitDate}}
+      - -s -w -X go.jetpack.io/devbox/build.Version={{.Version}}
+      - -s -w -X go.jetpack.io/devbox/build.Commit={{.Commit}}
+      - -s -w -X go.jetpack.io/devbox/build.CommitDate={{.CommitDate}}
     env:
       - CGO_ENABLED=0
       - GO111MODULE=on

boxcli/build.go

@@ -26,8 +26,6 @@ func BuildCmd() *cobra.Command {
 	return command
 }
 
-type runFunc func(cmd *cobra.Command, args []string) error
-
 func buildCmdFunc(flags *docker.BuildFlags) runFunc {
 	return func(cmd *cobra.Command, args []string) error {
 		path := pathArg(args)

boxcli/root.go

@@ -33,10 +33,11 @@ func RootCmd() *cobra.Command {
 	command.AddCommand(AddCmd())
 	command.AddCommand(BuildCmd())
 	command.AddCommand(GenerateCmd())
+	command.AddCommand(InitCmd())
 	command.AddCommand(PlanCmd())
 	command.AddCommand(RemoveCmd())
-	command.AddCommand(InitCmd())
 	command.AddCommand(ShellCmd())
+	command.AddCommand(VersionCmd())
 	return command
 }
 
@@ -51,3 +52,5 @@ func Main() {
 		os.Exit(1)
 	}
 }
+
+type runFunc func(cmd *cobra.Command, args []string) error

boxcli/version.go

@@ -0,0 +1,67 @@
+// Copyright 2022 Jetpack Technologies Inc and contributors. All rights reserved.
+// Use of this source code is governed by the license in the LICENSE file.
+
+package boxcli
+
+import (
+	"fmt"
+	"runtime"
+
+	"github.com/spf13/cobra"
+	"go.jetpack.io/devbox/build"
+)
+
+func VersionCmd() *cobra.Command {
+	flags := &versionFlags{}
+	command := &cobra.Command{
+		Use:  "version",
+		Args: cobra.NoArgs,
+		RunE: versionCmdFunc(flags),
+	}
+
+	command.Flags().BoolVarP(&flags.verbose, "verbose", "v", false, // value
+		"Verbose: displays additional version information",
+	)
+	return command
+}
+
+type versionFlags struct {
+	verbose bool
+}
+
+func versionCmdFunc(flags *versionFlags) runFunc {
+	return func(cmd *cobra.Command, args []string) error {
+		v := getVersionInfo()
+		if flags.verbose {
+			fmt.Printf("Version:     %v\n", v.Version)
+			fmt.Printf("Platform:    %v\n", v.Platform)
+			fmt.Printf("Commit:      %v\n", v.Commit)
+			fmt.Printf("Commit Time: %v\n", v.CommitDate)
+			fmt.Printf("Go Version:  %v\n", v.GoVersion)
+		} else {
+			fmt.Printf("%v\n", v.Version)
+		}
+		return nil
+	}
+}
+
+type versionInfo struct {
+	Version      string
+	IsPrerelease bool
+	Platform     string
+	Commit       string
+	CommitDate   string
+	GoVersion    string
+}
+
+func getVersionInfo() *versionInfo {
+	v := &versionInfo{
+		Version:    build.Version,
+		Platform:   fmt.Sprintf("%s_%s", runtime.GOOS, runtime.GOARCH),
+		Commit:     build.Commit,
+		CommitDate: build.CommitDate,
+		GoVersion:  runtime.Version(),
+	}
+
+	return v
+}

build/build.go

@@ -0,0 +1,8 @@
+package build
+
+// Variables in this file are set via ldflags.
+var (
+	Version    = "0.0.0-dev"
+	Commit     = "none"
+	CommitDate = "unknown"
+)

cmd/devbox/main.go

@@ -3,7 +3,9 @@
 
 package main
 
-import "go.jetpack.io/devbox/boxcli"
+import (
+	"go.jetpack.io/devbox/boxcli"
+)
 
 func main() {
 	boxcli.Main()