Initial commit

lang/go/utils/dirhash/go.mod

@@ -0,0 +1,3 @@
+module puck.moe/zilch/go/dirhash
+
+go 1.22.5

lang/go/utils/dirhash/main.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"archive/zip"
+	"crypto/sha256"
+	"fmt"
+	"io"
+	"os"
+	"sort"
+)
+
+func main() {
+	out, err := os.OpenFile(os.Getenv("out"), os.O_CREATE|os.O_RDWR, 0666)
+	if err != nil {
+		panic(err)
+	}
+
+	var files []string
+
+	f, err := zip.OpenReader(os.Getenv("src"))
+	if err != nil {
+		panic(err)
+	}
+
+	for _, file := range f.File {
+		if file.Mode().IsDir() {
+			continue
+		}
+
+		files = append(files, file.Name)
+	}
+
+	sort.Strings(files)
+	for _, rel := range files {
+		f, err := f.Open(rel)
+		if err != nil {
+			panic(err)
+		}
+		defer f.Close()
+
+		hash := sha256.New()
+		_, err = io.Copy(hash, f)
+		if err != nil {
+			panic(err)
+		}
+
+		fmt.Fprintf(out, "%x  %s\n", hash.Sum(nil), rel)
+	}
+
+	out.Close()
+	f.Close()
+}