Play with initrd
Resources
1. http://www.cpqlinux.com/dig-initrd.html
2. http://www.faqs.org/docs/evms/x3834.html

Unpacking an initrd

#prepare work directory
cd ~/temp

#Grap initrd
cp /media/cdrecorder/initrd.gz .

#unzip the file
gunzip initrd.gz

#you will get a new file named initrd

#create a directory as mount point
mkdir initrd.dir

#before mount it, change to super user
su

#mount it
mount initrd initrd.dir -o loop

#access it
cd initrd.dir

Packing an initrd (~/src/initrd/*)

#prepare work directory
cd ~/temp

#Create a file with 14M (14000*1k)
dd if=/dev/zero of=initrd bs=1k count=14000

#create a loop device from this file
losetup /dev/loop1 initrd

#create ext2 file system on this device
mkfs -t ext2 -m 0 /dev/loop1

#mount this file system under /mnt
mount /dev/loop1 /mnt

#copy file content from source to /mnt
cd ~/src/initrd/
#use tar to copy in order to keep symbolic links, file group, and permission)
tar cf - . | (cd /mnt; tar xf - )

#clean up
umount /mnt
losetup -d /dev/loop1

#the initrd is ready, zip it
cd ~/temp
gzip -f initrd



--
Pop (Pu Liu)

- posted by Pop @ 1:42 PM