Added scripts for getting and writing images

Makefile

@@ -1,8 +1,24 @@
 # This Makefile exists because it's my favorite way to simplify running groups of commands directly from the command line
 #
 # Variables
-NOTHING = yet
+IMAGE := raspios_lite_arm64.zip
+DOWNLOAD_LINK := https://downloads.raspberrypi.org/raspios_lite_arm64/images/raspios_lite_arm64-2021-11-08/2021-10-30-raspios-bullseye-arm64-lite.zip
 
 it-pretty:
-	@chmod +x init.sh
+	@chmod +x scripts/init.sh
-	@./init.sh
+	@scripts/init.sh
+
+it-autonomous:
+	@echo "soon!"
+
+acquisition:
+	@chmod +x scripts/get-image.sh
+	@scripts/get-image.sh
+
+imbuement:
+	@chmod +x scripts/write-image.sh
+	@scripts/write-image.sh
+
+preparations:
+	@echo "soon!"
+		

README.md

@@ -4,3 +4,7 @@ A collection of scripts for working with bare metal.
 ## Commands
 `make it-pretty` is meant to be run on a freshly installed operating system.
 It installs some utilities that I rely on for maximum developmental efficiency and generally makes the terminal nicer to look at.
+
+`make acquisition` runs a script that downloads an image and confirms it with a sha256 sum.
+
+`make imbuement` Looks for available USBs attached to the device and writes an image to it.

scripts/get-image.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+
+# Script for automatically downloading and checking the sha256sum of a RPi image
+
+# Variables
+DOWNLOAD_LINK=https://downloads.raspberrypi.org/raspios_lite_arm64/images/raspios_lite_arm64-2021-11-08/2021-10-30-raspios-bullseye-arm64-lite.zip
+IMAGE=2021-10-30-raspios-bullseye-arm64-lite.zip
+
+mkdir -p images
+
+if [[ -e images/$IMAGE ]]; then
+    echo "Image has already been downloaded."
+else
+    echo "Downloading Raspberry Pi OS for arm64 architecture"
+    curl -o images/$IMAGE $DOWNLOAD_LINK
+fi
+
+echo "Getting sha256sum and comparing..."
+cd images
+curl -so image.sha256 $DOWNLOAD_LINK.sha256
+sha256sum $IMAGE > computed.sha256
+diff image.sha256 computed.sha256
+
+if [[ $? -eq 0 ]]; then
+    echo "Image is healthy!"
+else
+    echo "Bad sha256sum :( deleting image"
+    rm ../images/$IMAGE
+fi
+
+rm *.sha256
+cd ..
+
+#ifeq ($(WRITABLE_BLOCK),) 
+## NOTE: This is not fully functional yet, not sure why
+#@read -p "Remove your flash drive, and press enter to continue"
+#@lsblk -pdo NAME,TRAN > current-blocks
+#@read -p "Insert your writeable drive, and press enter to continue"
+#@lsblk -pdo NAME,TRAN | diff current-blocks - | grep usb | awk '{print $$2}' > block.txt
+#@export BLOCK=`cat block.txt`
+#$(error No USB detected, wait a moment after plugging in and try again)
+#else
+#    @read -p "the memory block to be modified is $(WRITABLE_BLOCK), ensure this is the drive you wish to write to and press enter to continue"
+#    @unzip -p $(IMAGE) | sudo dd of=$(WRITABLE_BLOCK) bs=4M conv=fsync status=progress
+#    @rm block.txt current-blocks
+#    endif
+

scripts/write-image.sh

@@ -0,0 +1,90 @@
+#!/bin/bash
+
+# Script for writing a supplied image file to a data storage device (just usb drives for now)
+# Zen, 2022
+
+# Font decoration for better a e s t h e t i c
+RED="\e[0;91m"
+GREEN="\e[0;92m"
+BLUE="\e[0;94m"
+BOLD="\e[1m"
+ULINE="\e[4m"
+NC="\e[0m"
+
+# ------------------- Step 1 - Select USB -------------------
+
+echo "Looking for USB devices..."
+echo ""
+echo -e "${ULINE}Found these!${NC}"
+lsblk -pdo NAME,MODEL,TRAN | grep usb > usb-list
+i=1
+while read -u 11 line; do
+    echo -e "${BOLD}$i.${NC} $line"
+    i=$((i+1))
+done 11<usb-list
+echo ""
+
+read -p "Which USB would you like to write to? type a number, or 'c' to cancel: " -n1 dev
+echo ""
+echo ""
+case $dev in
+    c)
+        exit
+        ;;
+    [1-9])
+        target=$(sed "${dev}q;d" usb-list | awk '{print $1}')
+        echo -e "Writing image to: ${GREEN}$target${NC}"
+        ;;
+    *)
+        echo "lol what the heck does $dev mean"
+        exit
+        ;;
+esac
+
+# ------------------- Step 2 - Select Image -------------------
+
+ls images > img-list
+i=1
+echo ""
+echo -e "${ULINE}Images${NC}"
+while read -u 11 line; do
+    echo -e "${BOLD}$i.${NC} $line"
+    i=$((i+1))
+done 11<img-list
+echo ""
+read -p "Which image do you want to use? type a number, or 'c' to cancel: " -n1 img
+echo ""
+echo ""
+case $img in
+    c)
+        exit
+        ;;
+    [1-9])
+        image=$(sed "${img}q;d" img-list | awk '{print $1}')
+        echo -e "Okay, we're using ${BLUE}$image${NC} as the image file."
+        ;;
+    *)
+        echo "lol what the heck does $img mean"
+        exit
+        ;;
+esac
+
+# ------------------- Step 3 - Write Image to USB -------------------
+
+echo ""
+echo -e "Getting ready to write ${GREEN}$image${NC} to ${BLUE}$target${NC}"
+echo ""
+read -p "Press Enter to continue (ctrl+C to cancel):" 
+unzip -p "images/$image" | sudo dd of=$target bs=4M conv=fsync status=progress
+
+# Leaving this line in if I want to debug and not necessarily run dd all the time
+# echo "unzip -p \"images/$image\" | sudo dd of=$target bs=4M conv=fsync status=progress"
+
+
+# ------------------- Step 4 - Cleaning Up -------------------
+
+rm usb-list
+rm img-list
+echo ""
+echo -e "${BOLD}Congratulations!${NC} Write operation complete."
+echo "You probably want to prepare the USB with 'make preparations' before you use it."