linux-kernel - Re: kernel pruning script..

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Date:	Mon, 8 Feb 2016 15:22:46 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: kernel pruning script..

On Mon, Feb 08, 2016 at 12:14:23PM -0800, Linus Torvalds wrote:
> I'm replying to a really old email, because I - once again - installed
> this silly script that you wrote several years ago on a new machine.
> 
> So Bruce - how about we add this script to the kernel "tools"
> directory, because it's actually very useful for anybody who uses
> CONFIG_LOCALVERSION_AUTO like I do (and clearly you at least used to
> do too).
> 
> I think CONFIG_LOCALVERSION_AUTO is really nice for various reasons
> (not the least of which is just doing thing like
> 
>     gitk $(uname -r)..
> but also because it makes it easy to go back to previous kernels when
> you're working on bisecting stuff etc).

Yes, I'm a fan.  My test scripts check uname after boot to make sure
they're testing the kernel they built.

> I'll happily commit it as "tools/prune-kernel" or similar, but would
> like to get an ok from you as the original author.

Oh, feel free, thanks.

--b.

> And if somebody has improvements for specific distros, maybe the
> script will start getting improvements. And I won't have to copy it
> from an old machine every time, because it will just be there with the
> kernel source tree (and without a kernel source tree it's not needed).
> 
>                  Linus
> 
> On Wed, Jul 10, 2013 at 1:54 PM, J. Bruce Fields <bfields@...ldses.org> wrote:
> >
> > I run this by hand every now and then.  I'm probably doing it all wrong.
> >
> > --b.
> >
> > #!/bin/bash
> >
> > # 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:
> >
> > ssh "root@$1" '
> >
> > for f in $(ls /lib/modules); do
> >         if rpm -qf "/lib/modules/$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
> > '