linux-ext4 - Re: [PATCH v4] ext4: add test for all ext4/ext3/ext2 mount options

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Message-ID: <YYNUfvH52COSOnai@mit.edu>
Date:   Wed, 3 Nov 2021 23:33:18 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Lukas Czerner <lczerner@...hat.com>
Cc:     fstests@...r.kernel.org, linux-ext4@...r.kernel.org, guan@...u.me
Subject: Re: [PATCH v4] ext4: add test for all ext4/ext3/ext2 mount options

> +_has_kernel_config()
> +{
> +	option=$1
> +	config="/lib/modules/$(uname -r)/build/.config"
> +	grep -qE "^${option}=[my]" $config
> +}

In my test infrastructure, /lib/modules/$Kver/build/.config doesn't
exist.  That's because I build the kernel without any modules, and
then launch kvm using its --kernel command-line option.  This really
helps with development velocity, since the developer doesn't need to
waste time installing the kernel, and/or building a kernel rpm or
dpkg.  Instead, kvm can just launch the kernel directly out of the
build tree:

/usr/bin/kvm ... --kernel /build/ext4/arch/x86/boot/bzImage ..

So it would be nice if _has_kernel_config also checks to see if
/proc/config.gz exists, and if so, tries to use it.

Thanks,

			       	   	 - Ted