chore(goreleaser): Enable reproducible builds

.goreleaser.yaml

@@ -1,7 +1,7 @@
 project_name: castsponsorskip
 before:
   hooks:
-    - go run ./internal/generate/completions
+    - go run ./internal/generate/completions --date={{ .CommitDate }}
     - go run ./internal/generate/manpages --version={{ .Version }} --date={{ .CommitDate }}
 builds:
   - env:
@@ -13,7 +13,7 @@ builds:
       - -w
       - -X main.version=v{{.Version}}
       - -X main.commit={{.ShortCommit}}
-      - -X main.date={{.Date}}
+      - -X main.date={{.CommitDate}}
       - -X main.builtBy=goreleaser
     goarch:
       - amd64
@@ -22,6 +22,7 @@ builds:
     goarm:
       - "6"
       - "7"
+    mod_timestamp: "{{.CommitTimestamp}}"
 archives:
   - format: tar.gz
     # use zip for windows archives

internal/generate/completions/main.go

@@ -5,13 +5,29 @@ import (
 	"io"
 	"os"
 	"path/filepath"
+	"time"
 
 	"github.com/gabe565/castsponsorskip/cmd"
+	flag "github.com/spf13/pflag"
 )
 
 var Shells = []string{"bash", "zsh", "fish"}
 
 func main() {
+	flags := flag.NewFlagSet("", flag.ContinueOnError)
+
+	var dateParam string
+	flags.StringVar(&dateParam, "date", time.Now().Format(time.RFC3339), "Build date")
+
+	if err := flags.Parse(os.Args); err != nil {
+		panic(err)
+	}
+
+	date, err := time.Parse(time.RFC3339, dateParam)
+	if err != nil {
+		panic(err)
+	}
+
 	if err := os.RemoveAll("completions"); err != nil {
 		panic(err)
 	}
@@ -43,5 +59,9 @@ func main() {
 		if err := f.Close(); err != nil {
 			panic(err)
 		}
+
+		if err := os.Chtimes(f.Name(), date, date); err != nil {
+			panic(err)
+		}
 	}
 }

internal/generate/manpages/main.go

@@ -65,4 +65,8 @@ func main() {
 	if err := f.Close(); err != nil {
 		panic(err)
 	}
+
+	if err := os.Chtimes(f.Name(), date, date); err != nil {
+		panic(err)
+	}
 }