Packing and unpacking initrd: Difference between revisions
From Leo's Notes
This page was last edited on 24 February 2017, at 19:14.
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modify {{code|initird.img | modify {{code|initird.img}} or other similar images | ||
To extract {{code|initird.img | To extract {{code|initird.img}}: | ||
<syntaxhighlight lang="bash" line start="1" enclose="div"> | <syntaxhighlight lang="bash" line start="1" enclose="div"> | ||
# Go to an empty directory before extracting the image. | # Go to an empty directory before extracting the image. | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
To pack files back into {{code|initrd.img | To pack files back into {{code|initrd.img}} | ||
<syntaxhighlight lang="bash" line start="1" enclose="div"> | <syntaxhighlight lang="bash" line start="1" enclose="div"> | ||
# Go to the directory containing the contents of the image. | # Go to the directory containing the contents of the image. | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
You may want to run {{code|file /path/to/initrd.img | You may want to run {{code|file /path/to/initrd.img}} in order to determine the exact method of compression. The above commands above assumes {{code|cpio + gzip}}. | ||
[[Category:Linux]] | [[Category:Linux]] | ||
{{Navbox Linux}} | {{Navbox Linux}} | ||
Revision as of 19:14, 24 February 2017
modify initird.img or other similar images
To extract initird.img:
# Go to an empty directory before extracting the image.
mkdir -p /mnt/initrd_extract && cd /mnt/initrd_extract
gzip -dc < /path/to/initrd.img | cpio -i
To pack files back into initrd.img
# Go to the directory containing the contents of the image.
cd /mnt/initrd_extract
find . | cpio -o -c | gzip -9 > /path/to/initrd.img
You may want to run file /path/to/initrd.img in order to determine the exact method of compression. The above commands above assumes cpio + gzip.