diff --git a/cmd/posadka/main.go b/cmd/posadka/main.go
new file mode 100644
index 0000000..80c4cee
--- /dev/null
+++ b/cmd/posadka/main.go
@@ -0,0 +1,12 @@
+package main
+
+import (
+	"flag"
+)
+
+func init() {
+}
+
+func main() {
+	flag.Parse()
+}
diff --git a/modify.go b/modify.go
new file mode 100644
index 0000000..a08dc08
--- /dev/null
+++ b/modify.go
@@ -0,0 +1,44 @@
+package posadka
+
+import (
+	"path/filepath"
+)
+
+func EmptyRootPassword(prefix string) error {
+	path := filepath.Join(prefix, "etc/passwd")
+
+	return ReplaceInFile(
+		path,
+		[]byte("root:x:"),
+		[]byte("root::"),
+	)
+}
+
+func EnableSystemRequest(prefix string) error {
+	//579 # Enable System Request debugging of the kernel
+	//580 if [ "$SYSRQ" != "" ]; then
+	//581     echo "= Enabling System Request debugging of the kernel."
+	//582     cat >> ${PREFIX}/etc/sysctl.d/arm-image-installer-sysrq.conf <<-EOH
+	//583         # Controls the System Request debugging functionality of the kernel
+	//584         kernel.sysrq = 1
+	//585     EOH
+	//586 fi
+	return nil
+}
+
+func ShowBoot(prefix string) error {
+	path := filepath.Join(prefix, "etc/passwd")
+
+	//# remove quiet from kargs
+	//if [ "$SHOWBOOT" != "" ]; then
+	//		 sed -i 's|rhgb quiet ||g' /tmp/boot/loader/entries/*.conf
+	//fi
+
+	return ReplaceInFile(
+		path,
+		[]byte("rhgb quiet "),
+		[]byte(""),
+	)
+
+	return nil
+}
diff --git a/primitive.go b/primitive.go
new file mode 100644
index 0000000..5797c91
--- /dev/null
+++ b/primitive.go
@@ -0,0 +1,31 @@
+package posadka
+
+import (
+	"bytes"
+	"os"
+)
+
+// Replace `a` with `b` in a given file at `path`. This function is non-atomic
+// so be careful with crashing.
+func ReplaceInFile(path string, a, b []byte) error {
+	data, err := os.ReadFile(path)
+
+	if err != nil {
+		return err
+	}
+
+	data = bytes.Replace(
+		data,
+		a,
+		b,
+		1,
+	)
+
+	err = os.WriteFile(path, data, 0644)
+
+	if err != nil {
+		return err
+	}
+
+	return nil
+}