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-rw-r--r--pkg/config/version/genver/gen.go3
-rw-r--r--pkg/config/version/genver/main.go95
2 files changed, 98 insertions, 0 deletions
diff --git a/pkg/config/version/genver/gen.go b/pkg/config/version/genver/gen.go
new file mode 100644
index 0000000..e453824
--- /dev/null
+++ b/pkg/config/version/genver/gen.go
@@ -0,0 +1,3 @@
+package main
+
+//go:generate go run . -output ../version.go
diff --git a/pkg/config/version/genver/main.go b/pkg/config/version/genver/main.go
new file mode 100644
index 0000000..e0d80b0
--- /dev/null
+++ b/pkg/config/version/genver/main.go
@@ -0,0 +1,95 @@
+package main
+
+import (
+ "flag"
+ "io"
+ "log"
+ "os"
+ "os/exec"
+ "path/filepath"
+ "strings"
+ "text/template"
+ "time"
+)
+
+var (
+ flPackageName = flag.String("package", "version", "name for the generated golang package")
+ flVariableName = flag.String("variable", "VERSION", "variable name in the generated golang package")
+ flOutputFile = flag.String("output", "", "output filename (default stdout)")
+)
+
+func main() {
+ flag.Parse()
+ dir := "."
+ if flag.NArg() > 0 {
+ dir = flag.Args()[0]
+ }
+ dir, err := filepath.Abs(dir)
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ var output io.Writer
+ if len(*flOutputFile) > 0 {
+ fh, err := os.Create(*flOutputFile)
+ if err != nil {
+ log.Fatal(err)
+ }
+ defer fh.Close()
+ output = fh
+ } else {
+ output = os.Stdout
+ }
+
+ vers, err := GitDescribe(dir)
+ if err != nil {
+ log.Fatal(err)
+ }
+ vp := VersionPackage{
+ Name: *flPackageName,
+ Path: dir,
+ Date: time.Now(),
+ Variable: *flVariableName,
+ Version: vers,
+ }
+
+ packageTemplate.Execute(output, vp)
+}
+
+// VersionPackage is the needed information to template a version package
+type VersionPackage struct {
+ Name string
+ Path string
+ Date time.Time
+ Variable string
+ Version string
+}
+
+var packageTemplate = template.Must(template.New("default").Parse(packageLayout))
+var packageLayout = `package {{.Name}}
+// AUTO-GENERATED. DO NOT EDIT
+// {{.Date}}
+
+// {{.Variable}} is generated by git-describe from gen.go
+var {{.Variable}} = "{{.Version}}"
+ `
+
+// GitDescribe calls `git describe` in the provided path
+func GitDescribe(path string) (string, error) {
+ cwd, err := os.Getwd()
+ if err != nil {
+ return "", err
+ }
+ // TODO check if this is a directory
+ if err := os.Chdir(path); err != nil {
+ return "", err
+ }
+ defer os.Chdir(cwd)
+
+ buf, err := exec.Command("git", "describe").CombinedOutput()
+ if err != nil {
+ return "", err
+ }
+
+ return strings.TrimSpace(string(buf)), nil
+}