linux-kernel - Re: [PATCH] KVM: selftests: Avoid assuming "sudo" exists

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Date: Thu, 25 Apr 2024 16:10:27 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Brendan Jackman <jackmanb@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>, Shuah Khan <shuah@...nel.org>, kvm@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: selftests: Avoid assuming "sudo" exists

On Mon, Apr 15, 2024, Brendan Jackman wrote:
> I ran into a failure running this test on a minimal rootfs.
> 
> Can be fixed by just skipping the "sudo" in case we are already root.
> 
> Signed-off-by: Brendan Jackman <jackmanb@...gle.com>
> ---
>  tools/testing/selftests/kvm/x86_64/nx_huge_pages_test.sh | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/kvm/x86_64/nx_huge_pages_test.sh b/tools/testing/selftests/kvm/x86_64/nx_huge_pages_test.sh
> index 7cbb409801eea..0e56822e8e0bf 100755
> --- a/tools/testing/selftests/kvm/x86_64/nx_huge_pages_test.sh
> +++ b/tools/testing/selftests/kvm/x86_64/nx_huge_pages_test.sh
> @@ -13,10 +13,21 @@ NX_HUGE_PAGES_RECOVERY_RATIO=$(cat /sys/module/kvm/parameters/nx_huge_pages_reco
>  NX_HUGE_PAGES_RECOVERY_PERIOD=$(cat /sys/module/kvm/parameters/nx_huge_pages_recovery_period_ms)
>  HUGE_PAGES=$(cat /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages)
>  
> +# If we're already root, the host might not have sudo.
> +if [ $(whoami) == "root" ]; then
> +	function maybe_sudo () {

Any objection to do_sudo instead of maybe_sudo?  I can fixup when applying if
that works for you.

> +		"$@"
> +	}
> +else
> +	function maybe_sudo () {
> +		sudo "$@"
> +	}
> +fi
> +
>  set +e
>  
>  function sudo_echo () {
> -	echo "$1" | sudo tee -a "$2" > /dev/null
> +	echo "$1" | maybe_sudo tee -a "$2" > /dev/null
>  }
>  
>  NXECUTABLE="$(dirname $0)/nx_huge_pages_test"
> 
> ---
> base-commit: 2c71fdf02a95b3dd425b42f28fd47fb2b1d22702
> change-id: 20240415-kvm-selftests-no-sudo-1a55f831f882
> 
> Best regards,
> -- 
> Brendan Jackman <jackmanb@...gle.com>
>