kernel_remove: init script to remove a specified kernel

[thefossguy-ciq]

This script basically cleans up all the possible paths that might be populated from a make modules_install and make install. Given that the kernel is removed, the grub entry is also removed with the help of grubby.

This is an ad-hoc script created to quickly remove a kernel without much fuss about it.

---

The script only accepts the kernel version and is used like following:

$ ./kernel_remove.sh $KERNEL_VERSION

$ ./kernel_remove.sh 4.18.0-ciqlts8_8-6a8fa3030700+

And that's all. It will remove all installed files and even remove the grub entry.

[PlaidCat]

Could you add a check for making sure you're not deleting the running kernel?

Additionally could you add an Entry to the ReadMe explaining this and the expected use case and limitations?

Otherwise thanks this will be helpful for full systems or those that don't treat their VM's as disposable (i know this is important to some)

[thefossguy-ciq]

Some extra documentation that I am not sure goes in the README.

Trying to remove a kernel installed as an RPM

$ uname -r
4.18.0-ciqlts8_6-83208b00c+

$ ls -alh /lib/modules/
total 16K
drwxr-xr-x.  6 root root  161 Jul 14 21:56 .
dr-xr-xr-x. 40 root root 4.0K Jul 14 17:59 ..
drwxr-xr-x.  6 root root 4.0K Jul 14 21:57 4.18.0-372.32.1.el8_6.86ciq_lts.12.1.x86_64
drwxr-xr-x.  6 root root 4.0K Jul 14 21:57 4.18.0-372.32.1.el8_6.x86_64
drwxr-xr-x.  3 root root   19 Jul 14 17:42 4.18.0-372.9.1.el8.x86_64
drwxr-xr-x.  3 root root 4.0K Jul 14 20:56 4.18.0-ciqlts8_6-83208b00c+

$ ./kernel_remove.sh 4.18.0-372.32.1.el8_6.86ciq_lts.12.1.x86_64
+ requested_kernel_to_remove=4.18.0-372.32.1.el8_6.86ciq_lts.12.1.x86_64
++ dnf repoquery --latest-limit=1 --queryformat '%{version}-%{release}' kernel-core
+ latest_rpm_kernel=4.18.0-372.32.1.el8_6.86ciq_lts.12.1
++ uname -r
+ current_kernel=4.18.0-ciqlts8_6-83208b00c+
+ '[' -z 4.18.0-372.32.1.el8_6.86ciq_lts.12.1.x86_64 ']'
+ '[' 4.18.0-372.32.1.el8_6.86ciq_lts.12.1.x86_64 == 4.18.0-372.32.1.el8_6.86ciq_lts.12.1 ']'
++ uname -m
+ '[' 4.18.0-372.32.1.el8_6.86ciq_lts.12.1.x86_64 == 4.18.0-372.32.1.el8_6.86ciq_lts.12.1.x86_64 ']'
+ echo 'ERROR: Will not remove the *latest kernel* installed as an RPM package'
ERROR: Will not remove the *latest kernel* installed as an RPM package
+ exit 1

Trying to remove the current kernel

$ uname -r
4.18.0-ciqlts8_6-83208b00c+

$ ./kernel_remove.sh 4.18.0-ciqlts8_6-83208b00c+
+ requested_kernel_to_remove=4.18.0-ciqlts8_6-83208b00c+
++ dnf repoquery --latest-limit=1 --queryformat '%{version}-%{release}' kernel-core
+ latest_rpm_kernel=4.18.0-372.32.1.el8_6.86ciq_lts.12.1
++ uname -r
+ current_kernel=4.18.0-ciqlts8_6-83208b00c+
+ '[' -z 4.18.0-ciqlts8_6-83208b00c+ ']'
+ '[' 4.18.0-ciqlts8_6-83208b00c+ == 4.18.0-372.32.1.el8_6.86ciq_lts.12.1 ']'
++ uname -m
+ '[' 4.18.0-ciqlts8_6-83208b00c+ == 4.18.0-372.32.1.el8_6.86ciq_lts.12.1.x86_64 ']'
+ '[' 4.18.0-ciqlts8_6-83208b00c+ == 4.18.0-ciqlts8_6-83208b00c+ ']'
+ echo 'ERROR: Will not remove the current kernel'
ERROR: Will not remove the current kernel
+ exit 1

[Copilot]

Pull Request Overview

A new Bash script to remove a specified kernel version by cleaning up its modules, boot files, and grub entry, along with documentation of its usage.

• Added kernel_remove.sh to automate removal of development and older RPM kernels
• Updated README.md with a usage section and example trace output

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
kernel_remove.sh	New script to delete /lib/modules, /boot artifacts for a given kernel and update grub
README.md	Documentation for kernel_remove.sh, including description of development kernels and example usage

Comments suppressed due to low confidence (1)

README.md:84

• Add a note that this script requires sudo privileges to remove files and update grub entries, since it runs sudo rm and sudo grubby commands.

### kernel_remove.sh