Compressing And Re-Compressing initrd.img File System

[Punker]

I am new to the Linux operating system and wanted to perfom Linux Kernel Programing. And also wanted to try to compile my first kernel. And also I have found a lots of content regrading Compilation. But I still had one question that is regarded to "initrd.img" file that is present in the boot partition. Also tell me how can I compress and re-compress the files initrd.img file system. I wanted the full details of the file system and also the above deatils. Help would be appreciated.

[Zhankana_n]

The only solution for this is that you got to take the working example of the IS Bash. This are the type of commands that you got to run for the type of compressing and re-compressing of the files. Also check out for the various types of periods that are being used because the initrd.img is a temporary file format. And this is used to make the preparations before the real root file will be mounted to follow the procedure of the compression.

[teena_pansare]

But their are cases when the bash do not explain the file types, file paths and options nor the it does explain the command usage and the period. Bash may also be the answer for you,but this is not working for the file system that I have been currently using, and not without a working example would do for me. And their does not stand any chances to run this commands properly. And typically, you can try out by pasting the file path options and also the file names into commands and they will work. If their is a scenario that the bash is all I needed, I would have simply copied the file paths and options into the commands and everything would be fine.

[Ekpah]

The other option is that you got to run the below file called:

 "zcat ../initrd.gz | cpio -i -d."

and this is the working example for you. Execute the above file and it is done for you. If it does not execute properly then atleast it can extract the contents of the initrd.gz and then it can set up a directory tree for the contents. From a shell, type the following:
man zcat
info cpio
man bash
And you will find that all of this stuff IS explained.

[windows_user]

Then you can also run the following post that is given below and run the below post as the code that will help you to know the details of the bash files:

gzip initrd.img
cp initrd.img.gz TO/The/original/location/for/initrd.img

Then you have to make a backup of the original, and the Rename that back up to initrd.img.backup.
This will help you to see and compile the bash file that can be used for the initrd.img.

[Dolsy_bendal]

If your using the Debian system then the below given commands can be used for the
System type that you are using.

initrd is named initrd.img that is run in the root file itself.

Then move the initrd into the initrd.gz
And make the directory as the mkdir tree
cd tree
zcat ../initrd.gz | cpio -i -d
edit whatever in tree and to recompress

find . | cpio -o -H newc | gzip -9 > ../initrd.gz
cd ..
mv initrd.gz initrd.img

This is only for the Debain system only.

[Elijah]

And the directions are got to be assuming you have the initrd1.img in your home directory
And let us assume that your going to have the initrd1.img on your Desktop, user_name yanfaun
Open a terminal, become root, then...

cd /home/abc/Desktop
mv initrd1.img initrd.gz
mkdir tree
cd tree
zcat ../initrd.gz | cpio -i -d

Then it should be written as the initrd1.img is now extracted into the folder tree, (/home/yanfaun/Desktop/tree)
with the terminal you just used still open, after editing contents of tree, re-compress contents of tree into new initrd.gz, then rename it initrd1.img

find . | cpio -o -H newc | gzip -9 > ../initrd.gz
cd ..
mv initrd.gz initrd1.img