torch-pi-cloud-init/img-config.sh

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#!/bin/bash
[ $# -eq 0 ] && { echo "Usage: $0 IMG_FILE"; exit 1; }
SECTOR_BYTES=512
SECTOR_START=2048
OFFSET=$(($SECTOR_BYTES*$SECTOR_START))
./build.sh
mkdir -p boot-part
sudo mount -o rw,loop,offset=$OFFSET $1 ./boot-part
tar -xzvf build/rpi-cloud-init.tgz -C boot-part
sudo umount ./boot-part
rmdir ./boot-part
rm -rf ./build