Build date in config file

Signed-off-by: Mark Anderson <manderson@hashicorp.com>

agent/config/builder.go

@@ -804,6 +804,8 @@ func (b *builder) build() (rt RuntimeConfig, err error) {
 		Version:                    stringVal(c.Version),
 		VersionPrerelease:          stringVal(c.VersionPrerelease),
 		VersionMetadata:            stringVal(c.VersionMetadata),
+		// What is a sensible default for BuildDate?
+		BuildDate: timeValWithDefault(c.BuildDate, time.Now()),
 
 		// consul configuration
 		ConsulCoordinateUpdateBatchSize:  intVal(c.Consul.Coordinate.UpdateBatchSize),
@@ -1946,6 +1948,13 @@ func stringVal(v *string) string {
 	return *v
 }
 
+func timeValWithDefault(v *time.Time, defaultVal time.Time) time.Time {
+	if v == nil {
+		return defaultVal
+	}
+	return *v
+}
+
 func float64ValWithDefault(v *float64, defaultVal float64) float64 {
 	if v == nil {
 		return defaultVal

agent/config/config.go

@@ -3,6 +3,7 @@ package config
 import (
 	"encoding/json"
 	"fmt"
+	"time"
 
 	"github.com/hashicorp/consul/agent/consul"
 
@@ -273,6 +274,7 @@ type Config struct {
 	Version                    *string    `mapstructure:"version"`
 	VersionPrerelease          *string    `mapstructure:"version_prerelease"`
 	VersionMetadata            *string    `mapstructure:"version_metadata"`
+	BuildDate                  *time.Time `mapstructure:"build_date"`
 
 	// Enterprise Only
 	Audit Audit `mapstructure:"audit"`

agent/config/default.go

@@ -2,6 +2,7 @@ package config
 
 import (
 	"strconv"
+	"time"
 
 	"github.com/hashicorp/raft"
 
@@ -210,7 +211,7 @@ func NonUserSource() Source {
 // versionSource creates a config source for the version parameters.
 // This should be merged in the tail since these values are not
 // user configurable.
-func versionSource(rev, ver, verPre, meta string) Source {
+func versionSource(rev, ver, verPre, meta string, buildDate time.Time) Source {
 	return LiteralSource{
 		Name: "version",
 		Config: Config{
@@ -218,6 +219,7 @@ func versionSource(rev, ver, verPre, meta string) Source {
 			Version:           &ver,
 			VersionPrerelease: &verPre,
 			VersionMetadata:   &meta,
+			BuildDate:         &buildDate,
 		},
 	}
 }
@@ -225,7 +227,8 @@ func versionSource(rev, ver, verPre, meta string) Source {
 // defaultVersionSource returns the version config source for the embedded
 // version numbers.
 func defaultVersionSource() Source {
-	return versionSource(version.GitCommit, version.Version, version.VersionPrerelease, version.VersionMetadata)
+	buildDate, _ := time.Parse(time.RFC3339, version.BuildDate) // This has been checked elsewhere
+	return versionSource(version.GitCommit, version.Version, version.VersionPrerelease, version.VersionMetadata, buildDate)
 }
 
 // DefaultConsulSource returns the default configuration for the consul agent.

agent/config/runtime.go

@@ -62,6 +62,7 @@ type RuntimeConfig struct {
 	Version                    string
 	VersionPrerelease          string
 	VersionMetadata            string
+	BuildDate                  time.Time
 
 	// consul config
 	ConsulCoordinateUpdateMaxBatches int