gentoo chroot

#chroot into gentoo
cryptsetup luksOpen /dev/sda2 root
mount -o nodev,relatime,subvol=__active/rootvol /dev/mapper/root /mnt/gentoo
mount -o defaults,nosuid,nodev,relatime,subvol=__active/home /dev/mapper/root /mnt/gentoo/home
mount -o defaults,nosuid,nodev,relatime,subvol=__active/opt /dev/mapper/root /mnt/gentoo/opt
mount -o defaults,nosuid,nodev,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro /dev/sda1 /mnt/gentoo/boot

mount -t proc proc /mnt/gentoo/proc
mount --rbind /sys /mnt/gentoo/sys
mount --make-rslave /mnt/gentoo/sys
mount --rbind /dev /mnt/gentoo/dev
mount --make-rslave /mnt/gentoo/dev

chroot /mnt/gentoo /bin/bash