38 lines
917 B
Bash
Executable File
38 lines
917 B
Bash
Executable File
#!/bin/bash
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# Extracts the rootfs from OpenWRT Raspberry Pi image available from
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# https://downloads.openwrt.org/releases/19.07.2/targets/brcm2708/bcm2708/
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# and builds a Docker container out of it
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#
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# Refer to https://openwrt.org/toh/raspberry_pi_foundation/raspberry_pi
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# to choose the right image
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#
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# If building on x86, you must have qemu-arm and binfmt-support installed
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set -e
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source openwrt.conf
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IMG=${1:-openwrt-19.07.2-brcm2708-bcm2708-rpi-ext4-factory.img}
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mount_rootfs() {
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offset=$(sfdisk -d ${IMG} | grep "${IMG}2" | sed -E 's/.*start=\s+([0-9]+).*/\1/g')
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tmpdir=$(mktemp -u -p .)
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mkdir -p "${tmpdir}"
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sudo mount -o loop,offset=$((512 * $offset)) -t ext4 ${IMG} ${tmpdir}
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}
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docker_build() {
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sudo docker build \
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--build-arg ROOT_PW=${ROOT_PW} \
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-t ${BUILD_TAG} -f Dockerfile.rpi ${tmpdir}
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}
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cleanup() {
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sudo umount ${tmpdir}
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rm -rf ${tmpdir}
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}
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trap cleanup EXIT
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mount_rootfs
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docker_build |