set release version (#81)

.gitignore

@@ -1 +1,3 @@
 /bin/*
+
+dist/

.goreleaser.yaml

@@ -0,0 +1,34 @@
+# This is an example .goreleaser.yml file with some sensible defaults.
+# Make sure to check the documentation at https://goreleaser.com
+before:
+  hooks:
+    - go mod download
+builds:
+  - env:
+      - CGO_ENABLED=0
+    goos:
+      - linux
+      - windows
+      - darwin
+    ldflags:
+      - -s -w -X github.com/cloudspannerecosystem/wrench/cmd.version={{.Version}}
+    ignore:
+      - goos: darwin
+        goarch: 386
+
+archives:
+  - format: tar.gz
+    name_template: '{{ .ProjectName }}-{{ .Version }}-{{ .Os }}-{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}'
+    format_overrides:
+    - goos: windows
+      format: zip
+checksum:
+  name_template: 'checksums.txt'
+snapshot:
+  name_template: "{{ incpatch .Version }}-next"
+changelog:
+  sort: asc
+  filters:
+    exclude:
+      - '^docs:'
+      - '^test:'

cmd/errors.go

@@ -31,7 +31,7 @@ type Error struct {
 }
 
 func (e *Error) Error() string {
-	return fmt.Sprintf("Error command: %s, version: %s", e.cmd.Name(), Version)
+	return fmt.Sprintf("Error command: %s, version: %s", e.cmd.Name(), versionInfo())
 }
 
 func (e *Error) Unwrap() error {

cmd/root.go

@@ -22,13 +22,14 @@ package cmd
 import (
 	"context"
 	"os"
+	"runtime/debug"
 	"time"
 
 	"github.com/spf13/cobra"
 )
 
 var (
-	Version         = "unknown"
+	version         = ""
 	versionTemplate = `{{.Version}}
 `
 )
@@ -74,7 +75,7 @@ func init() {
 	rootCmd.PersistentFlags().StringVar(&credentialsFile, flagCredentialsFile, "", "Specify Credentials File")
 	rootCmd.PersistentFlags().DurationVar(&timeout, flagTimeout, time.Hour, "Context timeout")
 
-	rootCmd.Version = Version
+	rootCmd.Version = versionInfo()
 	rootCmd.SetVersionTemplate(versionTemplate)
 }
 
@@ -93,3 +94,16 @@ func spannerInstanceID() string {
 func spannerDatabaseID() string {
 	return os.Getenv("SPANNER_DATABASE_ID")
 }
+
+func versionInfo() string {
+	if version != "" {
+		return version
+	}
+
+	// For those who "go install" yo
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return "unknown"
+	}
+	return info.Main.Version
+}