runit-scripts/boot-services/00-pseudofs.sh

# shellcheck shell=sh

__mnt() {
	for last in "${@}"; do :; done
	mountpoint -q "${last}" || mount "${@}"
}

(
umask 0022
cd /dev && \
	mkdir pts shm

cd /run && {
	mkdir runit
	mkdir -m0700 cryptsetup
}
)

msg 'mounting pseudo file systems'
__mnt -o nosuid,noexec,nodev               -t proc     none   /proc
__mnt -o nosuid,noexec,nodev               -t sysfs    none   /sys
__mnt -o mode=0755,nosuid                  -t devtmpfs none   /dev
__mnt -o mode=0755,nosuid,nodev,size=512M  -t tmpfs    none   /run
__mnt -o mode=0620,gid=5,nosuid,noexec  -n -t devpts   devpts /dev/pts
__mnt -o mode=1777,nosuid,nodev,size=1G -n -t tmpfs    shm    /dev/shm
__mnt -o mode=0755,size=1M                 -t tmpfs    cgroup /sys/fs/cgroup

msg 'mounting cgroups'
while read -r name _ _ e; do
	[ "${e}" = 1 ] && {
		mkdir -p "/sys/fs/cgroup/${name}" || continue
		__mnt -o "${name}" -t cgroup cgroup "/sys/fs/cgroup/${name}"
	}
done < /proc/cgroups

mkdir -p /sys/fs/cgroup/unified
__mnt -o nsdelegate -t cgroup2 cgroup2 /sys/fs/cgroup/unified

msg "remounting root '/'"
mount -o remount /

unset __mnt