mirror of
https://github.com/ItsDrike/dotfiles.git
synced 2024-12-27 21:54:34 +00:00
82 lines
2.1 KiB
Bash
Executable file
82 lines
2.1 KiB
Bash
Executable file
#!/bin/sh
|
|
|
|
yes_no() {
|
|
while true; do
|
|
printf "$1 (y/n): "
|
|
read -r yn
|
|
case $yn in
|
|
[Yy]* ) return 0;;
|
|
[Nn]* ) return 1;;
|
|
* ) echo "Please answer yes or no";;
|
|
esac
|
|
done
|
|
}
|
|
|
|
# Ensure we run as root
|
|
if [ "$EUID" -ne 0 ]; then
|
|
echo "Must be ran as root"
|
|
exit 1
|
|
fi
|
|
|
|
# Take NEWROOT as 1st argument
|
|
if [ $# -ge 1 ]; then
|
|
NEWROOT="$1"
|
|
else
|
|
echo "Provide newroot directory"
|
|
exit 1
|
|
fi
|
|
|
|
# Take chroot user as 2nd argument, default to root
|
|
if [ $# -ge 2 ]; then
|
|
USERNAME="$2"
|
|
else
|
|
USERNAME="root"
|
|
fi
|
|
|
|
# Check if given NEWROOT is already mounted, if it is
|
|
# set REMOUNT to the mount source, so that we can remount
|
|
# it once we're done.
|
|
df_out=$(df --output=source,target | grep -w "$NEWROOT")
|
|
if [ -n "$df_out" ]; then
|
|
REMOUNT="$(echo $df_out | awk '{print $1}')"
|
|
else
|
|
# If the target isn't mounted already, check
|
|
# if user gave $3 (mount location)
|
|
if [ $# -ge 3 ]; then
|
|
mount "$3" "$NEWROOT"
|
|
else
|
|
# If user didn't give mount location, try to
|
|
# mount according to fstab
|
|
if [ -n "$(grep -w "$NEWROOT" /etc/fstab)" ]; then
|
|
mount "$NEWROOT"
|
|
else
|
|
# Ask for user confirmation to ensure that filesystem
|
|
# is ready for chroot in given NEWROOT, exit if not
|
|
yes_no "$NEWROOT wasn't mounted, is your filesystem in place?" || exit 1
|
|
fi
|
|
fi
|
|
fi
|
|
|
|
# Mount necessary directories for chroot to be possible
|
|
mount --types proc /proc "$NEWROOT/proc"
|
|
mount --rbind /sys "$NEWROOT/sys"
|
|
mount --make-rslave "$NEWROOT/sys"
|
|
mount --rbind /dev "$NEWROOT/dev"
|
|
mount --make-rslave "$NEWROOT/dev"
|
|
|
|
# Use /bin/su for chrooting with --login to also run
|
|
# /etc/profile and ~/.profile or ~/.zprofile
|
|
chroot "$NEWROOT" "/bin/su" "$USERNAME" --login
|
|
|
|
# Unmount recursively mounted directories
|
|
umount -l "$NEWROOT/dev"
|
|
umount -l "$NEWROOT/sys"
|
|
umount -l "$NEWROOT/proc"
|
|
umount -R "$NEWROOT"
|
|
|
|
# Remount partition according to fstab if REMOUT is set
|
|
# in order to leave the filesystem in the state it was
|
|
if [ -n "$REMOUNT" ]; then
|
|
mount "$REMOUNT" "$NEWROOT"
|
|
fi
|