Message-ID: <20191106042922.GD20442@Gentoo>
Date:   Wed, 6 Nov 2019 09:59:25 +0530
From:   Bhaskar Chowdhury <unixbhaskar@...il.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     "J. Bruce Fields" <bfields@...ldses.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scripts:prune-kernel:remove old kernels and modules dir
 from system

On 13:03 Wed 06 Nov 2019, Masahiro Yamada wrote:
>On Wed, Nov 6, 2019 at 12:10 PM Bhaskar Chowdhury <unixbhaskar@...il.com> wrote:
>>
>> On 11:53 Wed 06 Nov 2019, Masahiro Yamada wrote:
>> >On Tue, Nov 5, 2019 at 11:32 AM J. Bruce Fields <bfields@...ldses.org> wrote:
>> >>
>> >> 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.
>> >
>> >I am with Bruce.
>> >
>> >This patch is trying to replace everything
>> >with worse code.
>> Well,Masahiro,
>> I won't mind dropping the idea, which you already concluded.But, would
>> you care to let me know how worse the code seems to be????
>
>
>As far as I understood this script,
>it is useful to delete stale versions with a single command.
>
>scripts/prune-kernel  5.2-rc1  5.2-rc2  5.2-rc3
>
>
>This patch is dropping the 'for f in "$@"' loop,
>so you would end up with running this script multiple times.
>
>scripts/prune-kernel -r  5.2-rc1  5.2-rc1
>scripts/prune-kernel -r  5.2-rc2  5.2-rc2
>scripts/prune-kernel -r  5.2-rc3  5.2-rc3
>
Yes, true. You don't want all the stale kernels to be discarded at once,
do you???
>
>What is funny is, it takes the kernel_version and modules_version
>separately.
Lack of farsight of mine ...will take your suggestion. Should have
realized it before, but was writing for different purpose.

>And now it requires -r option for the default behavior.
Because other flags are involved and they do different things.

>I see nothing cool overall.
>
Meh... I am interpreting you "cool" literal way...which you certainly
didn't mean it...do you??
>
>
>J. Bruce Fields suggested:
>"But if somebody does actually use it as-is, it'd be nicer to keep the
>current behavior and add an option ("-i" or something) for the
>interactive behavior."
>
Yes, that's true ...and now I understood. On the contrary ,if I
recollect properly, Bruce ,once told that he won't if do something which
will be useful to the wider users..not sure that stands anymore.
>
>I want to see a patch if and only if
>you can add -i without intrusively changing the current code.
>
Hopefully , you wish get fulfilled sooner than later.
>
>Masahiro
>
>
>
Bhaskar
>
>> >
>> >BTW.
>> >Bruce,
>> >Does the current script expect RHEL or something?
>> >I do not see 'new-kernel-pkg' on my Ubuntu machine.
>> >
>> >It would still work with 'new-kernel-pkg: command not found'
>> >warning.
>> >
>> >We could bypass it if we like.
>> >
>> >command -v new-kernel-pkg && new-kernel-pkg --remove $f
>> >
>> >
>> >
>> >Masahiro Yamada
>> >
>> >
>> >
>> >> >
>> >> > 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
>> >
>> >
>> >
>> >--
>> >Best Regards
>> >
>> >Masahiro Yamada
>
>
>
>-- 
>Best Regards
>Masahiro Yamada

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