https://github.com/samwhelp/tool-initramfs-extract
tool-initramfs-extract
https://github.com/samwhelp/tool-initramfs-extract
cpio initramfs initramfs-extract initrd microcode
Last synced: about 2 months ago
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tool-initramfs-extract
- Host: GitHub
- URL: https://github.com/samwhelp/tool-initramfs-extract
- Owner: samwhelp
- License: mit
- Created: 2022-05-18T11:40:08.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2022-05-20T08:53:47.000Z (over 3 years ago)
- Last Synced: 2025-05-30T00:41:28.516Z (4 months ago)
- Topics: cpio, initramfs, initramfs-extract, initrd, microcode
- Language: Shell
- Homepage: https://samwhelp.github.io/tool-initramfs-extract/
- Size: 11.7 KB
- Stars: 3
- Watchers: 2
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# tool-initramfs-extract
* [tool-initramfs-extract](https://samwhelp.github.io/tool-initramfs-extract/) ([GitHub](https://github.com/samwhelp/tool-initramfs-extract))
* [initramfs-extract](https://github.com/samwhelp/tool-initramfs-extract/blob/main/src/asset/bin/initramfs-extract)
## Subject
* [Prepare](#prepare)
* [Manual Install](#manual-install)
* [Usage](#usage)
* [Link](#link)
## Prepare
``` sh
grep 'COMPRESS:' /etc/initramfs-tools/initramfs.conf
```
show
```
# COMPRESS: [ gzip | bzip2 | lz4 | lzma | lzop | xz | zstd ]
```
install (de)compress utils
``` sh
sudo apt-get install cpio gzip bzip2 xz-utils zstd lz4 lzop
```
## Manual Install
install [curl](https://packages.ubuntu.com/jammy/curl)
``` sh
sudo apt-get install curl
```
download [initramfs-extract](https://raw.githubusercontent.com/samwhelp/tool-initramfs-extract/main/src/asset/bin/initramfs-extract) to ~/.local/bin/initramfs-extract,
``` sh
curl -fLo ~/.local/bin/initramfs-extract --create-dirs https://raw.githubusercontent.com/samwhelp/tool-initramfs-extract/main/src/asset/bin/initramfs-extract
chmod 755 ~/.local/bin/initramfs-extract
```
## Usage
### Extract /boot/initrd.img
run
``` sh
initramfs-extract /boot/initrd.img initrd-root
```
or run
``` sh
initramfs-extract "/boot/initrd.img-$(uname -r)" initrd-root
```
> `unmkinitramfs -v /boot/initrd.img initramfs`
> `unmkinitramfs -v "/boot/initrd.img-$(uname -r)" initramfs`
### Extract initrd (other compress format)
create new initrd
``` sh
mkinitramfs -c bzip2 -o initrd.img
```
then extract
``` sh
initramfs-extract initrd.img initrd-root
```
> More [case](https://github.com/samwhelp/tool-initramfs-extract/tree/main/src/asset/case)
> `unmkinitramfs -v initrd.img initramfs`
## Link
* [Why is it that my initrd only has one directory, namely, 'kernel'?](https://unix.stackexchange.com/questions/163346/why-is-it-that-my-initrd-only-has-one-directory-namely-kernel)
* [How to extract initrd which contain microcode](https://www.ubuntu-tw.org/modules/newbb/viewtopic.php?post_id=362052#forumpost362052)