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

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Message-ID: <20240415-kvm-selftests-no-sudo-v1-1-95153ad5f470@google.com>
Date: Mon, 15 Apr 2024 14:43:54 +0000
From: Brendan Jackman <jackmanb@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Shuah Khan <shuah@...nel.org>
Cc: kvm@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Brendan Jackman <jackmanb@...gle.com>
Subject: [PATCH] KVM: selftests: Avoid assuming "sudo" exists

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 [ $(whoami) == "root" ]; then
+	function maybe_sudo () {
+		"$@"
+	}
+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>