From 0643c3638d0684231ee800e35fd171c008551745 Mon Sep 17 00:00:00 2001
From: "Kevin Veen-Birkenbach [aka. Frantz]" <kevin@veen.world>
Date: Thu, 30 Apr 2020 09:49:55 +0200
Subject: [PATCH] Implemented copying

---
 README.md   | 17 +++++++++--------
 sd_setup.sh | 12 +++++++++++-
 2 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/README.md b/README.md
index e0aef4a..95c8eb7 100644
--- a/README.md
+++ b/README.md
@@ -19,14 +19,15 @@ To install a Linux distribution manually on a SD card type in:
 To pase the configuration to the program use this syntax:
 ```bash
 (
-  echo "$USER"          # The username
-  echo "mmcblk1"        # The device
-  echo "3"              # The raspberry pi number
-  echo "arch"           # The operation system
-  echo "y"              # Transfer image
-  echo "user_password"  # The user password
-  echo "root_password"  # The root password
-  echo "y"              # Copy wifi configurations to target system
+  echo "$USER"            # | The username
+  echo "mmcblk1"          # | The device
+  echo "3"                # | The raspberry pi number
+  echo "arch"             # | The operation system
+  echo "y"                # | Transfer image
+  echo "n"                # ├── Overwrite device before copying
+  echo "user_password"    # | The user password
+  echo "root_password"    # | The root password
+  echo "y"                # | Copy wifi configurations to target system
 )| sudo bash ./sd_setup.sh
 ```
 
diff --git a/sd_setup.sh b/sd_setup.sh
index 9f0f8de..d31e676 100644
--- a/sd_setup.sh
+++ b/sd_setup.sh
@@ -175,6 +175,16 @@ mount_partitions(){
 echo "Should the image be transfered to $sd_card_path?(y/n)" && read -r transfer_image
 if [ "$transfer_image" = "y" ]
   then
+
+    echo "Should $sd_card_path be overwritten with zeros before copying?(y/n)" && read -r copy_zeros_to_device
+    if [ "$copy_zeros_to_device" = "y" ]
+      then
+        echo "Overwritting..."
+        dd if=/dev/zero of="$sd_card_path" bs=1M || error "Overwritting $sd_card_path failed."
+      else
+        echo "Skipping Overwritting..."
+    fi
+
     echo "Starting image transfer..."
     case "$os" in
       "arch")
@@ -194,7 +204,7 @@ if [ "$transfer_image" = "y" ]
         	echo ""		#and then press ENTER twice to accept the default first and last sector.
         	echo ""
         	echo "w"	#Write the partition table and exit by typing w.
-        )| fdisk "$sd_card_path" || error "Creating partitions failed. Try \"sudo dd if=/dev/zero of=$sd_card_path bs=1M\""
+        )| fdisk "$sd_card_path" || error "Creating partitions failed. Try to execute this script with the overwritting parameter."
 
         echo "Format boot partition..."
         mkfs.vfat "$boot_partition_path" || error "Format boot is not possible."