Update runit paper
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@ -122,6 +122,18 @@ You might want to play with that and understand what the initrd is,
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before you are put into a position where you *have* to use it and can't start a web browser.
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WARNING
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-------
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This document is now pretty old.
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It's unlikely it will work at all on a modern Arch installation.
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[My AUR](https://aur.archlinux.org/packages/runit-init/)
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is usually only a few days behind the latest change in Arch's packages.
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I've left this here because it might help people trying similar things
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with different distributions.
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But if you're using Arch, I strongly recommend you start with the AUR.
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Let's go
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--------
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@ -159,10 +171,10 @@ Be sure to move the old `init` to soming like `init.sysv`,
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then create a new `init` similar to this
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(don't forget to `chmod +x`):
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#! /bin/sh
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PATH=/usr/local/sbin:/usr/sbin:/sbin:/usr/local/bin:/usr/bin:/bin
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export PATH
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PATH=/usr/bin; export PATH
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if [ $$ -ne 1 ]; then
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case $1 in
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@ -178,49 +190,104 @@ then create a new `init` similar to this
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exit 1
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fi
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# Run arch's sysinit
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if ! /etc/rc.sysinit; then
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# Kludge it if there's no rc.sysinit
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echo
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echo 'Arch Linux'
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echo 'http://www.archlinux.org/'
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echo '-----------------------------'
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echo
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mount -t proc proc /proc -o nosuid,noexec,nodev
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mount -t sysfs sys /sys -o nosuid,noexec,nodev
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mount -t tmpfs run /run -o mode=0755,nosuid,nodev
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mount -t devtmpfs dev /dev -o mode=0755,nosuid
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mkdir -p /dev/{pts,shm}
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mount -t devpts devpts /dev/pts -o mode=0620,gid=5,nosuid,noexec
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mount -t tmpfs shm /dev/shm -o mode=1777,nosuid,nodev
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echo ":: Mounting initial filesystems"
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mountpoint -q /proc || mount -t proc proc /proc -o nosuid,noexec,nodev
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mountpoint -q /sys || mount -t sysfs sys /sys -o nosuid,noexec,nodev
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mountpoint -q /run || mount -t tmpfs run /run -o mode=0755,nosuid,nodev
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mountpoint -q /dev || mount -t devtmpfs dev /dev -o mode=0755,nosuid
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# This doesn't ever run fsck :<
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mount -o remount,rw /
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mkdir -p -m0755 /run/runit /run/lock /run/lock/lvm /run/lvm /run/user /dev/pts /dev/shm
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mountpoint -q /dev/pts || mount -n -t devpts devpts /dev/pts -o mode=0620,gid=5,nosuid,noexec
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mountpoint -q /dev/shm || mount -n -t tmpfs shm /dev/shm -o mode=1777,nosuid,nodev
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: < /etc/hostname > /proc/sys/kernel/hostname
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mount -o remount,ro /
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hwclock --systz
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echo ":: Setting up Unicode"
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for i in /dev/tty[0-9]*;do
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unicode_start <$i
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done &
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# Start/trigger udev, load MODULES, and settle udev
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udevd_modprobe sysinit
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echo ":: Setting system clock"
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hwclock --utc --hctosys
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echo ":: Enabling devices"
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touch /dev/mdev.seq
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/usr/bin/mdev -s &
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echo ":: Loading drivers"
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for i in $(seq 2); do
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find /sys -name modalias -type f -exec cat {} + | sort -u | xargs modprobe -b -a
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done 2>/dev/null
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echo ":: Bringing up network"
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ip link set up dev lo
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cat /etc/hostname >/proc/sys/kernel/hostname
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echo ":: Setting up cryptographic devices"
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grep "^[^#]" /etc/crypttab | while read name device password options; do
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case $options in
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*swap*)
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cryptsetup --key-file /dev/urandom open --type plain $device $name
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mkswap /dev/mapper/$name
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;;
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*)
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cryptsetup luksOpen $device $name < /dev/console
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;;
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esac
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done
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echo ":: Checking filesystems"
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[ -f /forcefsck ] || grep -q forcefsck /proc/cmdline && FORCEFSCK=-f
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if ! [ -f /fastboot ] && ! grep -q fastboot /proc/cmdline; then
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fsck -A -T -C -a -t noopts=_netdev $FORCEFSCK
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if [ $? -gt 1 ]; then
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sulogin
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fi
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fi
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echo ":: Mounting filesystems"
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mount -o remount,rw /
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mount -a -t "nosysfs,nonfs,nonfs4,nosmbfs,nocifs" -O no_netdev
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echo ":: Enabling swap"
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swapon -a
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echo ":: Tidying up"
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install -m0664 -o root -g utmp /dev/null /run/utmp &
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rm -f /etc/nologin /forcefsck /forcequotacheck /fastboot &
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if grep -q 'break=init' /proc/cmdline; then
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echo 'Breaking before init, type "exit" to continue booting'
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/bin/sh
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fi
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if [ -x /etc/rc.local ]; then
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echo ":: Sourcing /etc/rc.local"
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. /etc/rc.local
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fi
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# XXX: Who creates this?
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rm /run/nologin
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# Hand off to runit
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echo ":: Passing control to runit"
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echo
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exec runsvdir -P -s runit-signal /service
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This will still run `udev` and `bootlogd` from `/etc/rc.sysinit`.
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I tried to set up `mdev` from busybox as a `udev` replacement,
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but Xorg wants `udev`,
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and I was having other problems getting drivers loaded,
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so I'm just trusting the the Arch devs here.
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If you can figure out another way,
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please email me about it, I'd love to know.
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This does a couple things:
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1. Mounts /proc, /sys, /dev, and some other directories.
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2. Turns on Unicode for 9 TTYs
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3. Sets the system clock from the hardware clock
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4. Runs an initial mdev to populate /dev
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5. Loads modules for things in /sys
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6. Bring up the loopback interface
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7. Initialize your cryptfs, if you have any in /etc/crypttab
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8. fsck then mount everything in /etc/fstab
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9. Run whatever's in /etc/rc.local
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10. Start runsvdir
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You may also want to install the `dash` package,
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and link `/bin/sh` to that,
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@ -292,17 +359,17 @@ Here's my `/usr/local/sbin/runit-signal`
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15) # SIGTERM: reboot
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cleanup
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echo "Rebooting..."
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reboot -f
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busybox reboot -f
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;;
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10) # SIGUSR1: halt
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cleanup
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echo "Halting..."
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halt -f
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busybox halt -f
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;;
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12) # SIGUSR2: power
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cleanup
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echo "Shutting down..."
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poweroff -f
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busybox poweroff -f
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;;
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*) # Everything else
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;;
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@ -363,8 +430,12 @@ You're an Arch Linux sysadmin,
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you should know what you need,
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and I can't help you past here.
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Removing `udev`
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---------------
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Hotplug events won't work, though.
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For that, you need to either run udev or some other hotplug listener.
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Setting up `mdev` as a hotplug listener
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---------------------------------------
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The `mdev` utility of busybox can replace most of what `udev` does.
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You just need to have the kernel run `mdev` as the hotplug userspace thingy.
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