feat(commands): go build info (#5775)

Include go build info in the authelia build-info command.

Signed-off-by: James Elliott <james-d-elliott@users.noreply.github.com>

docs/content/en/reference/guides/metrics.md

@@ -20,7 +20,7 @@ to be used by administrators of their individual *Authelia* installs.
 ### Prometheus
 
 *Authelia* supports exporting [Prometheus] metrics. These metrics are served on a separate port at the `/metrics` path
-when configured. If metrics are enabled the metrics listener listens on `0.0.0.0:9959` as per the officially
+when configured. If metrics are enabled the metrics listener listens on `:9959` as per the officially
 [registered port] unless configured otherwise.
 
 #### Recorded Metrics

internal/commands/build-info.go

@@ -3,6 +3,8 @@ package commands
 import (
 	"fmt"
 	"runtime"
+	"runtime/debug"
+	"strings"
 
 	"github.com/spf13/cobra"
 
@@ -26,8 +28,37 @@ func newBuildInfoCmd(ctx *CmdCtx) (cmd *cobra.Command) {
 
 // BuildInfoRunE is the RunE for the authelia build-info command.
 func (ctx *CmdCtx) BuildInfoRunE(_ *cobra.Command, _ []string) (err error) {
+	var (
+		info *debug.BuildInfo
+		ok   bool
+	)
+
+	if info, ok = debug.ReadBuildInfo(); !ok {
+		return fmt.Errorf("failed to read build info")
+	}
+
+	b := &strings.Builder{}
+
+	b.WriteString(fmt.Sprintf(fmtAutheliaBuildGo, info.GoVersion, info.Main.Path, info.Path))
+
+	if len(info.Settings) != 0 {
+		b.WriteString("    Settings:\n")
+
+		for _, setting := range info.Settings {
+			b.WriteString(fmt.Sprintf("        %s: %s\n", setting.Key, setting.Value))
+		}
+	}
+
+	if len(info.Deps) != 0 {
+		b.WriteString("    Dependencies:\n")
+
+		for _, dep := range info.Deps {
+			b.WriteString(fmt.Sprintf("        %s@%s (%s)\n", dep.Path, dep.Version, dep.Sum))
+		}
+	}
+
 	_, err = fmt.Printf(fmtAutheliaBuild, utils.BuildTag, utils.BuildState, utils.BuildBranch, utils.BuildCommit,
-		utils.BuildNumber, runtime.GOOS, runtime.GOARCH, utils.BuildDate, utils.BuildExtra)
+		utils.BuildNumber, runtime.GOOS, runtime.GOARCH, utils.BuildDate, utils.BuildExtra, b.String())
 
 	return err
 }

internal/commands/const.go

@@ -29,6 +29,13 @@ Build OS: %s
 Build Arch: %s
 Build Date: %s
 Extra: %s
+
+Go: %s
+`
+	fmtAutheliaBuildGo = `
+    Version: %s
+    Module Path: %s
+    Executable Path: %s
 `
 
 	cmdAutheliaBuildInfoShort = "Show the build information of Authelia"