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build-rootfs-img.sh
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#!/bin/bash
set -eu
if [ $# -lt 2 ]; then
echo "Usage: $0 <rootfs dir> <img dir>"
echo "example:"
echo " ./tools/extract-rootfs-tar.sh rootfs-ubuntu-focal-desktop-arm64.tgz"
echo " ./build-rootfs-img.sh ubuntu-focal-desktop-arm64/rootfs ubuntu-focal-desktop-arm64"
exit 0
fi
TOP=$PWD
ROOTFS_DIR=$1
TARGET_OS=$(echo ${2,,}|sed 's/\///g')
IMG_FILE=$TARGET_OS/rootfs.img
if [ $# -eq 3 ]; then
IMG_SIZE=$3
else
IMG_SIZE=0
fi
true ${FS_TYPE:=ext4}
if [ ! -d ${ROOTFS_DIR} ]; then
echo "path '${ROOTFS_DIR}' not found."
exit 1
fi
# ----------------------------------------------------------
# Get host machine arch
HOST_ARCH=
if uname -mpi | grep aarch64 >/dev/null; then
HOST_ARCH="aarch64/"
fi
# Automatically re-run script under sudo if not root
if [ $(id -u) -ne 0 ]; then
echo "Re-running script under sudo..."
sudo --preserve-env "$0" "$@"
exit
fi
# Clean up temporary files
clean_rootfs() {
(cd $1 && {
# remove machine-id, the macaddress will be gen via it
[ -f etc/machine-id ] && > etc/machine-id
[ -f var/lib/dbus/machine-id ] && {
rm -f var/lib/dbus/machine-id
ln -s /etc/machine-id var/lib/dbus/machine-id
}
rm -f etc/pointercal
rm -f etc/fs.resized
rm -f etc/friendlyelec-release
rm -f root/running-state-file
rm -f etc/firstuse
rm -f var/cache/apt/archives/lock
rm -f var/lib/dpkg/lock
rm -f var/lib/dpkg/lock-frontend
rm -f var/cache/apt/archives/*.deb
[ -f etc/udev/rules.d/70-persistent-net.rules ] && cat /dev/null > etc/udev/rules.d/70-persistent-net.rules
rm -rf var/log/journal/*
[ -d ./tmp ] && find ./tmp -exec rm -rf {} +
mkdir -p ./tmp
chmod 1777 ./tmp
if [ -d ./var/lib/apt/lists ]; then
PERM=`grep "^_apt" ./etc/passwd | cut -d':' -f3`
if [ -e ./var/lib/apt/lists ]; then
[ -z ${PERM} ] || chown -R ${PERM}.0 ./var/lib/apt/lists
fi
if [ -e ./var/cache/apt/archives/partial ]; then
[ -z ${PERM} ] || chown -R ${PERM}.0 ./var/cache/apt/archives/partial
fi
fi
[ -d var/log ] && find var/log -type f -delete
[ -d var/tmp ] && find var/tmp -type f -delete
find -name .bash_history -type f -exec cp /dev/null {} \;
[ -e var/lib/systemd ] && touch var/lib/systemd/clock
[ -e var/lib/private/systemd/timesync ] && touch var/lib/private/systemd/timesync/clock
if [ -d var/lib/NetworkManager/ ]; then
rm -fr var/lib/NetworkManager/dhclient*
rm -fr var/lib/NetworkManager/secret_key
rm -fr var/lib/NetworkManager/timestamps
fi
[ -d dev ] && (cd dev && find . ! -type d -exec rm {} \;)
})
}
clean_rootfs ${ROOTFS_DIR}
make_ext4_img() {
local RET=0
local MKFS_PID=
local MKFS="${TOP}/tools/${HOST_ARCH}mke2fs"
local MKFS_OPTS="-E android_sparse -t ext4 -L rootfs -M /root -b 4096"
case ${TARGET_OS} in
friendlywrt* | buildroot*)
# set default uid/gid to 0
MKFS_OPTS="-0 ${MKFS_OPTS}"
;;
openmediavault-* | nixos* )
MKFS_OPTS="-E android_sparse -t ext4 -L nixos -M /root -b 4096"
;;
*)
;;
esac
if [ ${IMG_SIZE} -le 0 ]; then
# calc image size
IMG_SIZE=$(((`du -s -B64M ${ROOTFS_DIR} | cut -f1` + 3) * 1024 * 1024 * 64))
IMG_BLK=$((${IMG_SIZE} / 4096))
INODE_SIZE=$((`find ${ROOTFS_DIR} | wc -l` + 128))
# make fs
[ -f ${IMG_FILE} ] && rm -f ${IMG_FILE}
set +e
MKE2FS_CONFIG="${TOP}/tools/mke2fs.conf" ${MKFS} -N ${INODE_SIZE} ${MKFS_OPTS} -d ${ROOTFS_DIR} ${IMG_FILE} ${IMG_BLK} &
MKFS_PID=$!
wait $MKFS_PID
RET=$?
set -e
else
IMG_BLK=$((${IMG_SIZE} / 4096))
INODE_SIZE=$((`find ${ROOTFS_DIR} | wc -l` + 128))
[ -f ${IMG_FILE} ] && rm -f ${IMG_FILE}
set +e
MKE2FS_CONFIG="${TOP}/tools/mke2fs.conf" ${MKFS} -N ${INODE_SIZE} ${MKFS_OPTS} -d ${ROOTFS_DIR} ${IMG_FILE} ${IMG_BLK} &
MKFS_PID=$!
wait $MKFS_PID
RET=$?
set -e
fi
if [ $RET -ne 0 ]; then
oom_log=$(dmesg | tail -n 50 | grep -i 'killed process')
if echo "$oom_log" | grep -q "Killed process ${MKFS_PID}"; then
echo "Error: failed to generate rootfs.img, mke2fs was killed by oom-killer, please ensure that there is sufficient system memory to execute this program."
else
echo "Error: failed to generate rootfs.img, mke2fs failed with exit code ${RET}"
fi
exit $RET
fi
}
make_btrfs_img() {
local RET=0
local MKFS_PID=
if [ ${IMG_SIZE} -le 0 ]; then
IMG_SIZE=$(((`du -s -B64M ${ROOTFS_DIR} | cut -f1` + 3) * 1024 * 1024 * 64))
[ -f ${IMG_FILE} ] && rm -f ${IMG_FILE}
fi
truncate -s ${IMG_SIZE} ${IMG_FILE}
set +e
mkfs.btrfs -L rootfs ${IMG_FILE}
RET=$?
set -e
if [ $RET -ne 0 ]; then
echo "Error: failed to generate rootfs.img, mkfs.btrfs failed with exit code ${RET}"
exit $RET
fi
TMPDIR=$(mktemp -d)
mount -o loop ${IMG_FILE} ${TMPDIR}
(cd ${ROOTFS_DIR} && {
case ${TARGET_OS} in
friendlywrt* | buildroot*)
# set default uid/gid to 0
tar --numeric-owner -cvpf - * 2>/dev/null | tar --owner=0 --group=0 --numeric-owner --numeric-owner -xpf - -C ${TMPDIR}
RET=$?
;;
*)
tar --same-owner --numeric-owner -cvpf - * 2>/dev/null | tar --same-owner --numeric-owner -xpf - -C ${TMPDIR}
RET=$?
;;
esac
})
umount ${TMPDIR}
if [ $RET -ne 0 ]; then
echo "Error: failed to copy files to rootfs.img"
exit $RET
fi
}
if [ "${FS_TYPE}" = "ext4" ]; then
make_ext4_img
if [ ${TARGET_OS} != "eflasher" ]; then
case ${TARGET_OS} in
openmediavault-* | nixos* )
# disable overlayfs for openmediavault
cp ${TOP}/prebuilt/parameter-plain.txt ${TOP}/${TARGET_OS}/parameter.txt
;;
*)
${TOP}/tools/generate-partmap-txt.sh ${IMG_SIZE} ${TARGET_OS}
;;
esac
fi
elif [ "${FS_TYPE}" = "btrfs" ]; then
if ! command -v mkfs.btrfs &>/dev/null; then
apt-get install btrfs-progs
fi
make_btrfs_img
if [ ${TARGET_OS} != "eflasher" ]; then
# disable overlayfs for btrfs
cp ${TOP}/prebuilt/parameter-plain.txt ${TOP}/${TARGET_OS}/parameter.txt
# The difference between dtbo-plain.img and dtbo.img is that
# dtbo-plain.img does not use overlayfs
# and does not specify the data= parameter in the boot arguments.
# Additionally, the file system type is set to auto-detect instead of being fixed to ext4.
cp ${TOP}/prebuilt/dtbo-plain.img ${TOP}/${TARGET_OS}/dtbo.img
fi
else
echo "unknow FS_TYPE: ${FS_TYPE}."
exit 1
fi
echo "generating ${IMG_FILE} done."
echo 0