linux-kernel - Re: [PATCH] scripts:prune-kernel:remove old kernels and modules dir from system

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Message-ID: <50680c37-9e85-0050-c1e1-700260a0471c@infradead.org>
Date:   Mon, 4 Nov 2019 18:03:13 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Bhaskar Chowdhury <unixbhaskar@...il.com>
Cc:     bfields@...ldses.org, yamada.masahiro@...ionext.com,
        michal.lkml@...kovi.net, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scripts:prune-kernel:remove old kernels and modules dir
 from system

On 11/1/19 11:30 PM, Bhaskar Chowdhury wrote:
> This patch allow you to remove old kernels and associated modules
> directory from the system.You can do it at once with the -r flag
> and interactively with the -i flag.
> 
> Signed-off-by: Bhaskar Chowdhury <unixbhaskar@...il.com>
> ---
>  scripts/prune-kernel | 82 +++++++++++++++++++++++++++++++++++---------
>  1 file changed, 65 insertions(+), 17 deletions(-)

Hi,
I believe that this script now does what the patch author intends it to do.
It does have a few whitespace issues, but no big deals.  (see below)

Tested-by: Randy Dunlap <rdunlap@...radead.org>


> diff --git a/scripts/prune-kernel b/scripts/prune-kernel
> index e8aa940bc0a9..01d0778db71f 100755
> --- a/scripts/prune-kernel
> +++ b/scripts/prune-kernel
> @@ -1,21 +1,69 @@
>  #!/bin/bash
>  # SPDX-License-Identifier: GPL-2.0
> +#This script will remove old kernels and modules directory related to it.
> +#"-r" or "--remove" show how to silently remove old kernel and modules dir.
> +# "-h" or "--help" show how to use this script or show without parameter.
> +#"-i" or "--interactive" show how to remove interactively.
> +
> +flag=$1
> +kernel_version=$2
> +modules_version=$3
> +boot_dir=/boot
> +modules_dir=/lib/modules
> +
> +remove_old_kernel() {
> +	cd $boot_dir
> +	rm -If vmlinuz-$kernel_version System.map-$kernel_version config-$kernel_version
> +	return 0
> +}
> +
> +remove_old_modules_dir() {
> +	cd $modules_dir
> +	rm -rf $modules_version
> +	return 0
> +}
> +
> +usage() {
> +	printf "Usage: $(basename $0) [-ri]\n"
> +	printf "\n -r or --remove  kernel_version modules_version\n"
> +	printf "\n -i or --interactive do as interactive way\n"
> +	return 0
> +}
> +
> +case "$flag" in
> +	-i | --interactive)
> +		printf "\nEnter kernel version to remove or blank/empty to exit:"
> +		read kernel_version
> +		if [[ $kernel_version != "" ]]; then
> +			remove_old_kernel
> +			printf "\nRemoved kernel version:$kernel_version from the system.\n\n"

space after ':'

drop one \n above.

> +			printf "Please give the full modules directory name to remove:"
> +			read modules_version
> +			if [[ $modules_version != "" ]]; then
> +				remove_old_modules_dir
> +				printf "\n\nRemoved modules directory:$modules_version from the system.\n\n"

space after ':'

drop one \n above.

> +			else
> +				exit 1
> +			fi
> +		fi
> +		;;
> +	-h | --help)
> +		usage
> +		exit 0
> +		;;
> +	-r | --remove)
> +		if [[ $# -ne 3 ]]; then
> +			 printf "You need to provide kernel version and modules directory name.\n"
> +			 exit 1
> +		 else
> +			 remove_old_kernel
> +			 remove_old_modules_dir
> +		fi
> +		;;
> +	*)
> +		usage
> +		exit 1
> +		;;
> +esac
> 
> -# 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:
> 

OK, the former script's loop is removed.. good.
But the 2 preceding blank lines are not removed, so the script
now ends with 2 unnecessary blank lines.

> -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
> --


-- 
~Randy