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

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Message-ID: <20191105023243.GA16635@fieldses.org>
Date:   Mon, 4 Nov 2019 21:32:43 -0500
From:   "J. Bruce Fields" <bfields@...ldses.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Bhaskar Chowdhury <unixbhaskar@...il.com>,
        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 Mon, Nov 04, 2019 at 06:03:13PM -0800, Randy Dunlap wrote:
> 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)

My original comment stands: looks like it prompts for full module path
and kernel versions which means it's no more convenient than just doing
an "ls" and then removing the ones you want to.  (In fact, with "rm"
you'd also get the benefit of tab completion....)

It's quite different from the original script and I don't really see the
advantage.

--b.

> 
> 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