[pkg] modify version gen to read static version file

this can be used from any build script to distinguish the version string
that will be displayed (ie: 0.21.2-debian-1)

- Resolves: #468

1 files changed, 12 insertions, 2 deletions

diff --git a/pkg/config/version/genver/main.go b/pkg/config/version/genver/main.go
index e0d80b0..d4b72d8 100644
--- a/pkg/config/version/genver/main.go
+++ b/pkg/config/version/genver/main.go
@@ -3,6 +3,7 @@ package main
 import (
 	"flag"
 	"io"
+	"io/ioutil"
 	"log"
 	"os"
 	"os/exec"
@@ -43,7 +44,7 @@ func main() {
 
 	vers, err := GitDescribe(dir)
 	if err != nil {
-		log.Fatal(err)
+		vers = ReadVersionFile(dir)
 	}
 	vp := VersionPackage{
 		Name:     *flPackageName,
@@ -70,7 +71,7 @@ var packageLayout = `package {{.Name}}
 // AUTO-GENERATED. DO NOT EDIT
 // {{.Date}}
 
-// {{.Variable}} is generated by git-describe from gen.go
+// {{.Variable}} is generated by git-describe or static version file from gen.go
 var {{.Variable}} = "{{.Version}}"
  `
 
@@ -93,3 +94,12 @@ func GitDescribe(path string) (string, error) {
 
 	return strings.TrimSpace(string(buf)), nil
 }
+
+func ReadVersionFile(path string) string {
+	versionFile := filepath.Join(path, "../../../version")
+	content, err := ioutil.ReadFile(versionFile)
+	if err != nil {
+		return "unknown"
+	}
+	return strings.Trim(string(content), "\n")
+}