build: add enhanced information (#2067)

This commit adjusts the build flags to include version information in the LDFLAGS using the -X options. Additionally this makes the information recorded at build time more comprehensive. All build information can now be obtained via the `authelia build` command, and the `authelia version` command is now `authelia --version`. Lastly this adjusts the Dockerfile to utilize docker cache more effectively.

3 files changed, 36 insertions, 12 deletions

diff --git a/cmd/authelia/const.go b/cmd/authelia/const.go
new file mode 100644
index 000000000..296025de8
--- /dev/null
+++ b/cmd/authelia/const.go
@@ -0,0 +1,21 @@
+package main
+
+const fmtAutheliaLong = `authelia %s
+
+An open-source authentication and authorization server providing 
+two-factor authentication and single sign-on (SSO) for your 
+applications via a web portal.
+
+Documentation is available at: https://www.authelia.com/docs
+`
+
+const fmtAutheliaBuild = `Last Tag: %s
+State: %s
+Branch: %s
+Commit: %s
+Build Number: %s
+Build OS: %s
+Build Arch: %s
+Build Date: %s
+Extra: %s
+`
diff --git a/cmd/authelia/constants.go b/cmd/authelia/constants.go
deleted file mode 100644
index 14f2cf13a..000000000
--- a/cmd/authelia/constants.go
+++ /dev/null
@@ -1,7 +0,0 @@
-package main
-
-// BuildTag tag used to bootstrap Authelia binary.
-var BuildTag = "__BUILD_TAG__"
-
-// BuildCommit commit used to bootstrap Authelia binary.
-var BuildCommit = "__BUILD_COMMIT__"
diff --git a/cmd/authelia/main.go b/cmd/authelia/main.go
index d51b5e990..05af593e9 100644
--- a/cmd/authelia/main.go
+++ b/cmd/authelia/main.go
@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"os"
+	"runtime"
 
 	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
@@ -56,6 +57,8 @@ func startServer() {
 		logger.Fatalf("Cannot initialize logger: %v", err)
 	}
 
+	logger.Infof("Authelia %s is starting", utils.Version())
+
 	switch config.Logging.Level {
 	case "error":
 		logger.Info("Logging severity set to error")
@@ -145,24 +148,31 @@ func startServer() {
 
 func main() {
 	logger := logging.Logger()
+
+	version := utils.Version()
+
 	rootCmd := &cobra.Command{
 		Use: "authelia",
 		Run: func(cmd *cobra.Command, args []string) {
 			startServer()
 		},
+		Version: version,
+		Short:   fmt.Sprintf("authelia %s", version),
+		Long:    fmt.Sprintf(fmtAutheliaLong, version),
 	}
 
 	rootCmd.Flags().StringVar(&configPathFlag, "config", "", "Configuration file")
 
-	versionCmd := &cobra.Command{
-		Use:   "version",
-		Short: "Show the version of Authelia",
+	buildCmd := &cobra.Command{
+		Use:   "build",
+		Short: "Show the build of Authelia",
 		Run: func(cmd *cobra.Command, args []string) {
-			fmt.Printf("Authelia version %s, build %s\n", BuildTag, BuildCommit)
+			fmt.Printf(fmtAutheliaBuild, utils.BuildTag, utils.BuildState, utils.BuildBranch, utils.BuildCommit,
+				utils.BuildNumber, runtime.GOOS, runtime.GOARCH, utils.BuildDate, utils.BuildExtra)
 		},
 	}
 
-	rootCmd.AddCommand(versionCmd, commands.HashPasswordCmd,
+	rootCmd.AddCommand(buildCmd, commands.HashPasswordCmd,
 		commands.ValidateConfigCmd, commands.CertificatesCmd,
 		commands.RSACmd)