initramfs的init示例 - digwtx's Blog

initramfs的init示例

digwtx posted @ 2009年7月22日 04:07 in 未分类 , 2251 阅读

#!/bin/sh

echo "Loading, please wait..."

export PATH="/bin:/sbin"

[ -d /dev ] || mkdir -m 0755 /dev
[ -d /root ] || mkdir --mode=0700 /root
[ -d /sys ] || mkdir /sys
[ -d /proc ] || mkdir /proc
[ -d /tmp ] || mkdir /tmp

# Mount /proc and /sys:
mount -n proc /proc -t proc
mount -n sysfs /sys -t sysfs

/sbin/udevd --daemon
/sbin/udevadm trigger
/sbin/udevadm settle

#下面的这串解析内核命令行参数的代码是从Ubuntu的initrd抄过来的
for x in $(cat /proc/cmdline); do
case $x in
init=*)
init=${x#init=}
;;
root=*)
ROOT=${x#root=}
case $ROOT in
LABEL=*)
ROOT="/dev/disk/by-label/${ROOT#LABEL=}"
;;
UUID=*)
ROOT="/dev/disk/by-uuid/${ROOT#UUID=}"
;;
/dev/nfs)
BOOT=nfs
;;
esac
;;
rootflags=*)
ROOTFLAGS="-o ${x#rootflags=}"
;;
rootfstype=*)
ROOTFSTYPE="${x#rootfstype=}"
;;
rootdelay=*)
ROOTDELAY="${x#rootdelay=}"
;;
resumedelay=*)
RESUMEDELAY="${x#resumedelay=}"
;;
loop=*)
LOOP="${x#loop=}"
;;
loopflags=*)
LOOPFLAGS="-o ${x#loopflags=}"
;;
loopfstype=*)
LOOPFSTYPE="${x#loopfstype=}"
;;
cryptopts=*)
cryptopts="${x#cryptopts=}"
;;
nfsroot=*)
NFSROOT="${x#nfsroot=}"
;;
netboot=*)
NETBOOT="${x#netboot=}"
;;
ip=*)
IPOPTS="${x#ip=}"
;;
boot=*)
BOOT=${x#boot=}
;;
resume=*)
RESUME="${x#resume=}"
;;
noresume)
NORESUME=y
;;
panic=*)
panic="${x#panic=}"
;;
quiet)
quiet=y
;;
ro)
readonly=y
;;
rw)
readonly=n
;;
debug)
debug=y
exec >/tmp/initramfs.debug 2>&1
set -x
;;
debug=*)
debug=y
set -x
;;
break=*)
break=${x#break=}
;;
break)
break=premount
;;
0|1|2|3|4|5|6)
RUNLEVEL=$x
;;
esac
done

for ((t=0;t<32;i++)) ;
do
echo "Mounting the ROOT DEVICE..."
mount -o ro $ROOT /mnt
mountpoint -q /mnt && break
sleep 4
done

killall udevd
umount /proc
umount /sys
exec switch_root /mnt /sbin/init $RUNLEVEL

/bin/sh

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This is often seen with live distributions of Linux that run entirely on memory. A live distribution of Linux unmounts the disc and then loads it into memory, so trying out a new OS or repairing another doesn't hurt the installed system.

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