linux-kernel - Re: [PATCH] scripts : prune-kernel : prune kernels generalized way

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Date:   Fri, 18 Oct 2019 04:30:03 +0530
From:   Bhaskar Chowdhury <unixbhaskar@...il.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     yamada.masahiro@...ionext.com, michal.lkml@...kovi.net,
        bfields@...ldses.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scripts : prune-kernel : prune kernels generalized way

On 13:16 Thu 17 Oct 2019, Randy Dunlap wrote:
>On 10/16/19 11:31 PM, Bhaskar Chowdhury wrote:
>> This patch will remove old kernel from the system in a selective way.
>> 
>> Signed-off-by: Bhaskar Chowdhury <unixbhaskar@...il.com>
>> ---
>> For Randy :
>> ✔ ~/git-linux/linux-kbuild [master|AM/REBASE ↑·8|✔]
>> 11:42 $ ./scripts/checkpatch.pl -f
>> scripts/0001-Fix-all-the-concern-raised-by-Randy.patch
>> total: 0 errors, 0 warnings, 93 lines checked
>> 
>> scripts/0001-Fix-all-the-concern-raised-by-Randy.patch has no obvious
>> style problems and is ready for submission.
>> 
>> scripts/prune-kernel | 75 ++++++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 75 insertions(+)
>> 
>> diff --git a/scripts/prune-kernel b/scripts/prune-kernel
>> index e69de29bb2d1..9461ae2bc122 100755
>> --- a/scripts/prune-kernel
>> +++ b/scripts/prune-kernel
>> @@ -0,0 +1,75 @@
>> +#!/bin/bash
>> +# SPDX-License-Identifier: GPL-2.0
>> +
>> +# because I use CONFIG_LOCALVERSION_AUTO, not the same version again and
>> +# again, /boot and /lib/modules/ eventually fill up.
>> +# Dumb script to purge that stuff:
>> +
>> +#for f in "$@"
>> +#do
>> +#        if rpm -qf "/lib/modules/$f" >/dev/null; then
>> +#                echo "keeping $f (installed from rpm)"
>> +#        elif [ $(uname -r) = "$f" ]; then
>> +#                echo "keeping $f (running kernel) "
>> +#        else
>> +#                echo "removing $f"
>> +#                rm -f "/boot/initramfs-$f.img" "/boot/System.map-$f"
>> +#                rm -f "/boot/vmlinuz-$f"   "/boot/config-$f"
>> +#                rm -rf "/lib/modules/$f"
>> +#                new-kernel-pkg --remove $f
>> +#        fi
>> +#done
>> +boot_dir=/boot
>> +modules_dir=/lib/modules
>> +function remove_old_kernel(){
>> +	cd $boot_dir
>> +	rm -If vmlinuz-$kernel_version System.map-$kernel_version config-$kernel_verison
>
>typo/spello: not tested:                                                  ^^^^^^^^^^^^^^
>
/face palm
>> +}
>> +function remove_old_kernel_modules_dir(){
>> +	cd $modules_dir
>> +	rm -rf $modules_version
>> +}
>> +printf "\n\n Enlist the installed kernels \n\n"
>> +
>> +find $boot_dir -name "vmlinuz-*" -type f  -exec ls -1 {} \;
>> +
>> +printf "\n\n\n Please give the kernel version to remove: %s"
>> +read kernel_version
>> +if [[ $kernel_version -eq "" ]];then
>> +	printf "You have forgotten the version to give for removal"
>
>No message needed IMO -- just exit.
>
I though busy user mind should be reminded what they miss, so the msg. 
>> +	exit 1
>> +else
>> +        remove_old_kernel
>> +fi
>> +
>> +printf "\n\n Enlist the installed modules directory \n\n"
>> +
>> +find $modules_dir  -maxdepth 0 -type d -exec ls -1 {} \;
>> +
>> +printf "\n\n Please give the full modules directory name to remove: %s"
>> +read modules_version
>> +if [[ $modules_version -eq "" ]];then
>> +	printf "You have forgotten to give the modules dir to remove"
>
>ditto.
>
Same login like above if it reaches here, which should not.
>> +else
>> +        remove_old_kernel_modules_dir
>> +fi
>> +
>> +printf "\n\n Removed kernel version: $kernel_version and associated modules: $modules_version ...Done \n"
>> +while :
>> +  do
>> +     printf "\n\n Do you want to remove another?[YN] : %s"
>> +     read response
>> +
>> +       if [[ $response == "Y" ]];then
>
>Odd indentation here.  Some lines use tab, some lines use spaces.
>
Don't know how fix this bloody thing.
>> +	printf "Please give another version to remove : %s"
>> +	read kernel_version
>> +	remove_old_kernel
>> +	printf "\n\n Please give the full modules directory name to remove: %s"
>> +	read modules_version
>> +	remove_old_kernel_modules_dir
>> +        printf "\n\n Removed kernel version: $kernel_version and associated modules: $modules_version ...Done \n"
>> +
>> +      elif [[ $response == "N" ]];then
>> +	   exit 1
>> +      fi
>> +  done
>> --
>> 2.21.0
>
>
>And lastly, 'patch' will apply this patch cleanly, but it ends up with
>almost all of this patch inserted into the new prune-kernel source file
>before the current contents of the prune-kernel source file,
>so I think that the emailed patch file has a problem.
>
Duh! that shit ...should have realized it before ...
>-- 
>~Randy
>
Thanks Randy for the heads up.

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