练习:写一个脚本,(使用函数)
1、提示用户输入一个磁盘设备的设备文件,如果设备文件不存在,就提示用户重新输入,直到用户输入正确为止;
当用户给出正确的块设备后:
1、显示用户输入块设备,并提示用户,后续的操作会损坏设备上的所有文件,让用户选择是否继续
2、如果用户输入y,则继续后面的操作;
1、如果用户选择了y, 则抹除指定块设备上的所有分区;
1、在上面的磁盘创建两个主分区:
(1) 50M
(2) 512M
2、均格式化为ext4文件系统;
3、分别挂载至/mnt/boot和/mnt/sysroot
1、在此设备上安装grub;
2、在/mnt/sysroot目录下创建根文件系统所需要各目录;
1、移植多个应用程序,至少包含bash、ifconfig等;
3、如果用户输入n,则显示用户选择了中止,并退出脚本;
4、输入任何其它字符,则让用户重新选择;
2、用户可以输入quit退出;
#!/bin/bash
#########################################################################
# File Name: 007.sh
# Author: LookBack
# Email: taoxiaoyuzy@vip.qq.com
# Licence: GNU General Public Licence
# Created Time: Wed 23 Jul 2014 04:11:57 AM CST
#########################################################################
mntboot="/mnt/boot"
mntsysroot="/mnt/sysroot"
Program="bash ifconfig ls df ping"
checkInput() {
clear
until [ -n "$(fdisk -l $DiskName)" -a -z "$(echo ${DiskName} | grep -o '[0-9]')" ]; do
read -p "Plz Enter A Device File Name : " DiskName
done
}
printDisk() {
clear
fdisk -l $DiskName
cat << EOF
=============================================================================================
==== ====
==== Subsequent actions will damage all the files on the device, ask whether to continue ====
==== If you continue, please enter: y|Y|Yes|YES|yes|yES|yEs|YeS|yeS ====
==== If you do not want to enter the: n|N|No|NO|no|nO ====
==== ====
=============================================================================================
EOF
read -p "Plz input : " XDisk
clear
}
umountDisk() {
[ -n "$(mount | grep -oE "$1")" ] && umount $1 &> /dev/null
}
makePartition() {
for i in 1 2; do umountDisk ${DiskName}$i;done
dd if=/dev/zero of=$DiskName bs=512 count=1 &> /dev/null
fdisk $DiskName &> /dev/null << EOF
n
p
1
+50M
n
p
2
+512M
w
EOF
}
mke2fsPartition() {
mke2fs -t $1 $2 &> /dev/null
}
mountPartition() {
[ ! -d "$mntboot" ] && mkdir -p $mntboot
[ ! -d "$mntsysroot" ] && mkdir -p $mntsysroot
mount $1 $2
}
installGrub() {
grub-install --root-directory=/mnt $DiskName &> /dev/null
cp /boot/vmlinuz-$(uname -r) $mntboot/
#cp /boot/initramfs-$(uname -r).img $mntboot/
dracut $mntboot/initramfs-$(uname -r).img $(uname -r)
cat > $mntboot/grub/grub.conf << EOF
default=0
timeout=5
splashp_w_picpath=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
#password --md5 \$1\$6Gi8p1\$U1hyuGTVQnsvz5gG9w9pf/
title CentOS $(uname -r) -This is a TEST OS-
root (hd0,0)
kernel /vmlinuz-$(uname -r) ro root=/dev/sda2 selinux=0 init=/bin/bash
initrd /initramfs-$(uname -r).img
EOF
chmod 600 $mntboot/grub/grub.conf
}
makeFHSdir() {
mkdir -p $mntsysroot/{bin,dev,etc,home,lib/modules,lib64,opt,proc,root,sbin,selinux,sys,usr/{bin,sbin,lib,lib64},mnt,media,tmp,var/lib}
}
transplantProgram() {
for i in $Program; do
[ ! -d ${mntsysroot}$(dirname $(which --skip-alias $i)) ] && mkdir -p ${mntsysroot}$(dirname $(which --skip-alias $i))
[ ! -f ${mntsysroot}$(which --skip-alias $i) ] && cp $(which --skip-alias $i) ${mntsysroot}$(dirname $(which --skip-alias $i))/
for j in $(ldd $(which --skip-alias $i) | grep -oE '/[^[:space:]]+'); do
[ ! -d ${mntsysroot}$(dirname $j) ] && mkdir -p ${mntsysroot}$(dirname $j)
[ ! -f ${mntsysroot}$j ] && cp $II ${mntsysroot}$j
done
done
}
nextScript() {
printDisk
case $XDisk in
y|Y|[yY][eE][sS])
makePartition
for i in 1 2;do mke2fsPartition ext4 ${DiskName}$i;done
mountPartition ${DiskName}1 $mntboot
mountPartition ${DiskName}2 $mntsysroot
installGrub
makeFHSdir
transplantProgram
seq 3 | xargs -i sync
clear
;;
n|N|[nN][oO])
clear
exit 0
;;
*)
nextScript
esac
}
main() {
clear
read -p "Plz Enter A Device File Name : " DiskName
case $DiskName in
q|Q|[qQ][uU][iI][tT])
clear
exit 0
;;
*)
checkInput
nextScript
esac
}
main