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