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Initramfs » История » Редакция 5

Редакция 4 (Андрей Волков, 2013-04-28 14:02) → Редакция 5/8 (Андрей Волков, 2014-05-23 14:02)

h1. Initramfs 

 /init 
 <pre> 
 #!/bin/busybox sh 

 # Mount the /proc and /sys filesystems. 
 mount -t proc none /proc 
 mount -t sysfs none /sys 

 # Do your stuff here. 
 echo "This script mounts rootfs and boots it up, nothing more!" 

 rescue_shell() { 
     echo "Something went wrong. Dropping you to a shell." 
     busybox --install -s 
     exec /bin/sh 
 } 

 mini_udev() { 
     ln -s ../bin/busybox /sbin/mdev 
     echo /sbin/mdev > /proc/sys/kernel/hotplug 
     /sbin/mdev -s 
 } 

 # Use devtmpfs if possible 
 if grep -qs devtmpfs /proc/filesystems; then 
     mount -n -t devtmpfs -o "exec,nosuid,mode=0755,size=10M" udev /dev 
     devtmpfs=true 
 else     
     mini_udev 
     devtmpfs=false 
 fi 

 uuidlabel_root() { 
     for cmd in $(cat /proc/cmdline) ; do 
         case $cmd in 
         root=*) 

	     mkdir -p /etc/lvm 
	     echo 'devices { filter = [ "a|/dev/md[0-9]+$|", "a|/dev/[hsv]d[a-z][0-9]*$|", "r/.*/" ] }' > /etc/lvm/lvm.conf 

	     echo 'activation { udev_rules = 0 }' >> /etc/lvm/lvm.conf 

	     /sbin/lvm vgscan 
	     /sbin/lvm vgchange -ay --sysinit 

             type=$(echo $cmd | cut -d= -f2) 
             if [ $type == "LABEL" ] || [ $type == "UUID" ] ; then 
                 uuid=$(echo $cmd | cut -d= -f3) 
                 mount -o ro $(blkid |grep "$type=\"$uuid\"" | cut -d: -f1 | grep -v '/dev/dm-[0-9]*$\|-real$' | sort | head -n1 ) /mnt/root || rescue_shell 
             else 
                 mount -o ro $(echo $cmd | cut -d= -f2) /mnt/root || rescue_shell 
             fi 
             ;; 
	 rescue) 
	     rescue_shell 
	     ;; 
         esac 
     done 
 } 

 uuidlabel_root || rescue_shell 

 # Remount /dev if devtmpfs 
 $devtmpfs && mount -n --move /dev /mnt/root/dev 

 # Clean up. 
 umount /proc 
 umount /sys 

 # Boot the real thing. 
 exec switch_root /mnt/root /sbin/init 
 </pre> 

 <pre> 
 cd initramfs 
 find | cpio -o -H newc | gzip -9 > ../initramfs-2012-04-03.igz 
 </pre> 

 для сборки i686: 

 /etc/paludis/bashrc 

 <pre> 
 CC="x86_64-pc-linux-gnu-gcc -m32" 
 </pre> 

 для dropbear --enable-static-nss (glibc) 

 /etc/paludis/use.conf.d/initramfs.conf 

 <pre> 
 dev-libs/libtommath static-libs 
 net-misc/dropbear minimal -pam -shadow static -zlib 
 dev-libs/popt static-libs 
 net-misc/rsync static -drop_cache -iconv -ipv6 
 sys-fs/lvm2 static -udev 
 sys-apps/busybox -ipv6 static 
 </pre>