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chroot helper
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| #!/bin/bash | |
| if [ "$1" != "start" ] && [ "$1" != "stop" ]; then | |
| echo "usage: ./chroot.sh <start|stop> <rootfs>" | |
| exit 1; | |
| fi | |
| ACTION=$1 | |
| if [ ! -d "$2" ]; then | |
| echo "error: invalid directory: $2" | |
| exit 1; | |
| fi | |
| FAKEROOT=$2 | |
| set -euo pipefail | |
| MOUNTPOINTS=("/tmp" "/dev/null" "/dev/pts" "/dev/random" "/dev/shm" "/dev/urandom" "/proc") | |
| function stop_chroot() { | |
| for MOUNTPOINT in "${MOUNTPOINTS[@]}"; do | |
| echo "unmounting ${FAKEROOT}${MOUNTPOINT}" | |
| umount "${FAKEROOT}${MOUNTPOINT}" 2> /dev/null || true | |
| done | |
| } | |
| function start_chroot() { | |
| for MOUNTPOINT in "${MOUNTPOINTS[@]}"; do | |
| echo "mounting ${MOUNTPOINT} > ${FAKEROOT}${MOUNTPOINT}" | |
| mount -o bind "${MOUNTPOINT}" "${FAKEROOT}${MOUNTPOINT}" | |
| done | |
| chroot "${FAKEROOT}" /bin/bash --login | |
| } | |
| function main() { | |
| if [ "${ACTION}" == "start" ]; then | |
| start_chroot | |
| elif [ "${ACTION}" == "stop" ]; then | |
| stop_chroot | |
| fi | |
| } | |
| main |
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