devfs: add code to mount /dev

All Linux systems need /dev to be set up,so add code to devfs to do
this. The process devfs follows is below.

1. If static_dev is yes, nothing is done.
2. if /dev is an entry in fstab it is mounted or remounted based on that
entry.
3. If /dev is not in fstab, it attempts to mount /dev as a devtmpfs or
   tmpfs depending on which is defined in the kernel; devtmpfs is
   preferred.
4. If neither devtmpfs nor tmpfs is defined, it assumes the user wants
static /dev and prints a warning.

X-Gentoo-Bug: 492694
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=492694
This commit is contained in:
William Hubbs 2013-12-01 16:31:02 -06:00
parent 3470eda3f5
commit 8352082eb6
3 changed files with 69 additions and 5 deletions

View File

@ -15,7 +15,7 @@ include ${MK}/os.mk
CONF-FreeBSD= ipfw moused powerd rarpd savecore syscons
CONF-Linux= consolefont dmesg hwclock keymaps killprocs modules
CONF-Linux= consolefont devfs dmesg hwclock keymaps killprocs modules
CONF-NetBSD= moused rarpd savecore

2
conf.d/devfs Normal file
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@ -0,0 +1,2 @@
# Set this to yes if your /dev is not a devtmpfs or tmpfs.
# static_dev="NO"

View File

@ -2,15 +2,71 @@
# Copyright (c) 2007-2008 Roy Marples <roy@marples.name>
# Released under the 2-clause BSD license.
description="Mount system critical filesystems in /dev."
description="Set up the /dev directory"
depend() {
use dev-mount
depend()
{
provide dev-mount
before dev
keyword -prefix -vserver -lxc
}
start() {
mount_dev()
{
local action=--mount devfstype msg=Mounting
# Some devices require exec, Bug #92921
local mountopts="exec,nosuid,mode=0755"
if yesno ${static_dev:-no}; then
einfo "Using static /dev"
return 0
fi
if mountinfo -q /dev; then
action=--remount
mountopts="remount,$mountopts"
msg=Remounting
fi
if fstabinfo -q /dev; then
ebegin "$msg /dev according to @SYSCONFDIR@/fstab"
fstabinfo -q $action /dev
eend $?
return 0
fi
if grep -q devtmpfs /proc/filesystems; then
devfstype=devtmpfs
mountopts="$mountopts,size=10M"
elif grep -q tmpfs /proc/filesystems; then
devfstype=tmpfs
mountopts="$mountopts,size=10M"
fi
if [ -n "$devfstype" ]; then
ebegin "$msg $devfstype on /dev"
mount -n -t $devfstype -o $mountopts dev /dev
eend $?
else
ewarn "This kernel does not have devtmpfs or tmpfs support."
ewarn "Assuming you want static /dev. If this is not the case,"
ewarn "please set the CONFIG_DEVTMPFS or CONFIG_TMPFS option"
ewarn "in your kernel."
fi
}
seed_dev()
{
# Seed /dev with some things that we know we need
# creating /dev/console, /dev/tty and /dev/tty1 to be able to write
# to $CONSOLE with/without bootsplash before udevd creates it
[ -c /dev/console ] || mknod -m 600 /dev/console c 5 1
[ -c /dev/tty1 ] || mknod -m 620 /dev/tty1 c 4 1
[ -c /dev/tty ] || mknod -m 666 /dev/tty c 5 0
# udevd will dup its stdin/stdout/stderr to /dev/null
# and we do not want a file which gets buffered in ram
[ -c /dev/null ] || mknod -m 666 /dev/null c 1 3
# so udev can add its start-message to dmesg
[ -c /dev/kmsg ] || mknod -m 660 /dev/kmsg c 1 11
# Mount required stuff as user may not have then in /etc/fstab
for x in \
"mqueue /dev/mqueue 1777 ,nodev mqueue" \
@ -34,5 +90,11 @@ start() {
eend $?
fi
done
}
start()
{
mount_dev
seed_dev
return 0
}