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Skip per-boot update-initramfs when nouveau blacklist is baked into the VHD #161

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Skip per-boot update-initramfs when nouveau blacklist is baked into the VHD #161

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18 changes: 15 additions & 3 deletions install.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -29,9 +29,21 @@ done

use_package_manager_with_retries wait_for_dpkg_lock install_cached_nvidia_packages 10 3

# blacklist nouveau driver, nvidia driver dependency
cp /opt/gpu/blacklist-nouveau.conf /etc/modprobe.d/blacklist-nouveau.conf
update-initramfs -u
# blacklist nouveau driver, nvidia driver dependency.
# Rebuilding the initramfs costs ~10-30s at every node boot. When the VHD already baked the
# nouveau blacklist into its initramfs for THIS exact kernel (AgentBaker writes the marker
# below), skip the rebuild. Fall back to the full path on any mismatch -- older VHD without the
# marker, kernel drift between VHD build and node boot, or altered on-disk content -- so the
# outcome is always correct regardless of VHD/image version skew.
NOUVEAU_BLACKLIST_MARKER="/opt/azure/aks-gpu/nouveau-blacklist-marker"
if [ -f "${NOUVEAU_BLACKLIST_MARKER}" ] && \
grep -qx "kernel=$(uname -r)" "${NOUVEAU_BLACKLIST_MARKER}" && \
cmp -s /opt/gpu/blacklist-nouveau.conf /etc/modprobe.d/blacklist-nouveau.conf; then
echo "nouveau blacklist already baked into VHD initramfs for kernel $(uname -r); skipping update-initramfs"
else
cp /opt/gpu/blacklist-nouveau.conf /etc/modprobe.d/blacklist-nouveau.conf
update-initramfs -u
fi

# clean up lingering files from previous install
set +e
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