Blancco: playbook now produces working Ubuntu-kernel initramfs out of the box
Companion to the previous commit (4550d43). Three files that should have
been in the same commit but got left out of `git add`:
- .gitignore: negate rule for boot-tools/blancco/grub-blancco.cfg so the
tracked cfg (source of truth for grubx64.efi rebuilds) survives
the blanket boot-tools/ ignore.
- playbook/blancco-init.sh: rewritten for modprobe-with-deps, full NIC
driver coverage, set -x trace to /dev/console, dmesg + PCI-device +
/proc/modules dump + interactive shell on "no NIC after 60s".
Replaces the narrow insmod-loop version that silently hung on
unsupported NICs.
- playbook/pxe_server_setup.yml "Build Blancco PXE initramfs" task now
sweeps the full drivers/net/ tree (ethernet + phy + mdio + usb + fddi
+ wan) plus overlay / squashfs / loop / ptp / libphy / mii deps, runs
depmod to regenerate modules.dep inside the initramfs (required for
modprobe dependency resolution), and symlinks the full applet list
blancco-init.sh needs (modprobe, insmod, dmesg, find, env, etc).
Result: ~20 MB initramfs vs the old 2 MB narrow build.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
cproudlock
@@ -2,167 +2,125 @@
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# Blancco PXE Loader - init script for custom initramfs
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# Boot chain: iPXE -> GRUB EFI -> Ubuntu kernel + this initramfs -> switch_root to Blancco
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#
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# Blancco's own kernel freezes on Dell Precision towers during PXE boot.
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# Workaround: boot Ubuntu kernel, download Blancco rootfs (squashfs), mount
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# overlay filesystem, and switch_root into Blancco's userspace.
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# Blancco's own kernel freezes / lacks NIC drivers for some Dell Precision
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# hardware during PXE boot. Workaround: boot Ubuntu kernel (which has a wider
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# NIC driver set), download Blancco rootfs (squashfs), overlay-mount, and
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# switch_root into Blancco's userspace.
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#
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# Verbose trace + shell-on-NIC-failure because silent hangs during Blancco
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# PXE boot are painful to debug. set -x goes to /dev/console so the screen
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# shows every step; if no NIC appears after the modprobe sweep, we dump
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# dmesg / lspci / /proc/modules and drop to sh so the operator can
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# investigate without re-imaging.
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exec >/dev/console 2>&1
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set -x
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echo ""
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echo "============================================"
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echo " Blancco PXE loader (verbose)"
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echo "============================================"
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echo ""
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export PATH=/bin:/sbin
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echo ""
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echo "============================================"
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echo " Blancco PXE loader"
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echo "============================================"
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echo ""
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mount -t proc proc /proc
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mount -t sysfs sysfs /sys
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mount -t devtmpfs devtmpfs /dev 2>/dev/null
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mkdir -p /tmp /run
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mount -t devtmpfs devtmpfs /dev 2>/dev/null || mount -t tmpfs tmpfs /dev
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mkdir -p /tmp /run /run/lower /run/upper /run/work /run/newroot
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KVER=$(uname -r)
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echo "Running kernel: $KVER"
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ls /lib/modules/ 2>/dev/null
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echo "[1/4] Loading NIC drivers..."
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for mod in /lib/modules/*.ko; do
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echo " insmod $(basename $mod)"
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insmod $mod 2>/dev/null || true
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echo "[1/5] Loading NIC drivers via modprobe (resolves deps automatically)..."
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# Throw the full common-NIC driver list at the wall. modprobe resolves the
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# deps from /lib/modules/$KVER/modules.dep (built by prepare-boot-tools).
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# Anything missing is silently ignored; whatever matches PCI IDs will bind.
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for drv in \
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mii libphy ptp \
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e1000 e1000e igb igc ixgbe ixgbevf i40e ice iavf \
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tg3 bnx2 bnx2x bnxt_en b44 \
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r8169 r8152 atlantic \
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vmxnet3 virtio_net virtio_pci \
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pcnet32 8139too 8139cp \
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sfc sfc_ef100 mlx4_en mlx5_core \
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alx atl1c atl1e atl2 \
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via_rhine via_velocity forcedeth \
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pegasus dm9601 asix ax88179_178a cdc_ether cdc_ncm rndis_host; do
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modprobe -v "$drv" 2>/dev/null && echo " OK $drv" || true
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done
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sleep 5
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sleep 3
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echo " Interfaces after driver load:"
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ls /sys/class/net/ 2>/dev/null
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echo "[2/5] /sys/class/net after driver load:"
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ls /sys/class/net/ || true
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ip link || true
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echo " Waiting for network interface..."
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echo " Waiting up to 60s for non-lo interface..."
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IFACE=""
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COUNT=0
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while [ $COUNT -lt 60 ]; do
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for i in /sys/class/net/*; do
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ifname="${i##*/}"
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if [ "$ifname" != "lo" ] && [ -d "$i" ]; then
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IFACE=$ifname
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break 2
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fi
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for i in $(seq 1 60); do
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for n in /sys/class/net/*; do
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name="${n##*/}"
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[ "$name" = "lo" ] && continue
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[ -d "$n" ] && IFACE="$name" && break 2
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done
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COUNT=$((COUNT + 1))
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sleep 1
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echo -n "."
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done
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echo ""
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if [ -z "$IFACE" ]; then
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echo "ERROR: No network interface found!"
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echo "Available interfaces:"
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ls /sys/class/net/ 2>/dev/null
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exec sh
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echo "ERROR: No network interface after 60s"
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echo "=== dmesg tail ==="; dmesg | tail -40
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echo "=== PCI devices (sysfs) ==="; ls /sys/bus/pci/devices/ 2>/dev/null
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echo "=== loaded modules ==="; cat /proc/modules
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echo "Dropping to shell - type 'exit' to reboot."
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exec /bin/sh
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fi
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echo " Interface: $IFACE"
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ip link set $IFACE up
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echo " IFACE=$IFACE, bringing up..."
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ip link set "$IFACE" up || ifconfig "$IFACE" up
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sleep 2
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SERVER=10.9.100.1
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ifconfig $IFACE 10.9.100.250 netmask 255.255.255.0 up
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ifconfig "$IFACE" 10.9.100.250 netmask 255.255.255.0 up
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sleep 1
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echo " IP: 10.9.100.250"
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echo " IP: 10.9.100.250 SERVER: $SERVER"
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ip addr
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echo "[2/4] Downloading Blancco rootfs (666MB)..."
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echo "[3/5] Downloading airootfs.sfs (~756 MB)..."
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wget -O /tmp/airootfs.sfs http://$SERVER/blancco/arch/x86_64/airootfs.sfs 2>&1
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if [ ! -s /tmp/airootfs.sfs ]; then
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echo "ERROR: Failed to download rootfs!"
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exec sh
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fi
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echo " OK ($(wc -c < /tmp/airootfs.sfs) bytes)"
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echo "[3/4] Mounting rootfs..."
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mkdir -p /run/lower /run/upper /run/work /run/newroot
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[ -s /tmp/airootfs.sfs ] || { echo "ERROR: download failed"; exec /bin/sh; }
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echo "[4/5] Mounting rootfs + overlay..."
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modprobe overlay 2>/dev/null || insmod /lib/modules/$KVER/kernel/fs/overlayfs/overlay.ko 2>/dev/null
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modprobe squashfs 2>/dev/null || insmod /lib/modules/$KVER/kernel/fs/squashfs/squashfs.ko 2>/dev/null
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modprobe loop 2>/dev/null
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losetup /dev/loop0 /tmp/airootfs.sfs
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mount -t squashfs -o ro /dev/loop0 /run/lower
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if [ $? -ne 0 ]; then
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echo "ERROR: squashfs mount failed!"
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exec sh
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fi
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insmod /lib/modules/overlay.ko 2>/dev/null
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mount -t tmpfs -o size=50% tmpfs /run/upper
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mkdir -p /run/upper/upper /run/upper/work
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mount -t overlay overlay -o lowerdir=/run/lower,upperdir=/run/upper/upper,workdir=/run/upper/work /run/newroot
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if [ $? -ne 0 ]; then
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echo "ERROR: overlay mount failed!"
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exec sh
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fi
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echo "[4/5] Installing kernel modules (132MB)..."
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echo "[5/5] Fetching kmod tarball + config..."
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wget -O /tmp/kmod.tar.gz http://$SERVER/blancco/kmod.tar.gz 2>&1
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if [ -s /tmp/kmod.tar.gz ]; then
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cd /run/newroot
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gunzip -c /tmp/kmod.tar.gz | tar xf -
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rm -f /tmp/kmod.tar.gz
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cd /
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echo " OK"
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else
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echo " WARNING: Failed to download kernel modules"
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fi
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[ -s /tmp/kmod.tar.gz ] && (cd /run/newroot && gunzip -c /tmp/kmod.tar.gz | tar xf - && rm -f /tmp/kmod.tar.gz)
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echo "[5/6] Switching root to Blancco..."
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mkdir -p /run/newroot/run /run/newroot/proc /run/newroot/sys /run/newroot/dev /run/newroot/tmp
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mkdir -p /run/newroot/albus
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wget -O /run/newroot/albus/config.xml http://$SERVER/blancco/config-clean.xml 2>&1 || true
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wget -O /run/newroot/albus/preferences.xml http://$SERVER/blancco/preferences.xml 2>&1 || true
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cp -f /run/newroot/albus/preferences.xml /run/newroot/albus/preferences.save 2>/dev/null || true
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echo "[6/6] Downloading Blancco config..."
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wget -O /run/newroot/albus/config.xml http://$SERVER/blancco/config-clean.xml 2>&1
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wget -O /run/newroot/albus/preferences.xml http://$SERVER/blancco/preferences.xml 2>&1
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if [ -s /run/newroot/albus/config.xml ]; then
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echo " config.xml: $(wc -c < /run/newroot/albus/config.xml) bytes"
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else
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echo " WARNING: Failed to download config.xml"
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fi
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if [ -s /run/newroot/albus/preferences.xml ]; then
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cp -f /run/newroot/albus/preferences.xml /run/newroot/albus/preferences.save
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echo " preferences.xml: $(wc -c < /run/newroot/albus/preferences.xml) bytes"
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else
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echo " WARNING: Failed to download preferences.xml"
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fi
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# Pre-configure X.org to use modesetting driver (generic KMS, works with all GPUs)
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mkdir -p /run/newroot/etc/X11/xorg.conf.d
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echo " X.org: forcing modesetting driver"
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cat > /run/newroot/etc/X11/xorg.conf.d/20-failsafeDriver.conf << 'XEOF'
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cat > /run/newroot/etc/X11/xorg.conf.d/20-failsafeDriver.conf << XEOF
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Section "Device"
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Identifier "Failsafe Video Device"
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Driver "modesetting"
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EndSection
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XEOF
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# Enable SSH for remote debugging
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echo " Enabling SSH (root:blancco)..."
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if [ -f /run/newroot/etc/ssh/sshd_config ]; then
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sed 's/^#*PermitRootLogin.*/PermitRootLogin yes/' /run/newroot/etc/ssh/sshd_config > /run/newroot/etc/ssh/sshd_config.new || true
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mv /run/newroot/etc/ssh/sshd_config.new /run/newroot/etc/ssh/sshd_config || true
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fi
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cat > /run/newroot/etc/rc.local << 'RCEOF'
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#!/bin/bash
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echo 'root:blancco' | chpasswd
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ssh-keygen -A 2>/dev/null
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/usr/bin/sshd 2>/dev/null
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RCEOF
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chmod +x /run/newroot/etc/rc.local
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cat > /run/newroot/etc/systemd/system/pxe-debug.service << 'SVCEOF'
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[Unit]
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Description=PXE Debug SSH
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After=network.target
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[Service]
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Type=oneshot
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RemainAfterExit=yes
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ExecStart=/etc/rc.local
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[Install]
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WantedBy=multi-user.target
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SVCEOF
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ln -sf /etc/systemd/system/pxe-debug.service /run/newroot/etc/systemd/system/multi-user.target.wants/pxe-debug.service 2>/dev/null
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mkdir -p /run/newroot/proc /run/newroot/sys /run/newroot/dev /run/newroot/run /run/newroot/tmp
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mount --move /proc /run/newroot/proc
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mount --move /sys /run/newroot/sys
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mount --move /dev /run/newroot/dev
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echo " Starting Blancco..."
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echo "Switching root..."
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exec switch_root /run/newroot /sbin/init
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@@ -700,42 +700,66 @@
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# Boot Ubuntu kernel, download Blancco rootfs, overlay mount, switch_root.
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- name: "Build Blancco PXE initramfs"
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# The narrow hand-picked NIC driver list used before 2026-04-22 produced
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# a 2 MB initramfs that hung on "waiting for network interface" for any
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# hardware outside e1000e/igb/tg3/bnx2/bnxt_en/b44. This rewrite sweeps
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# the full drivers/net/ tree (ethernet + phy + mdio + usb + fddi + wan)
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# plus overlay / squashfs / loop / ptp / libphy / mii deps, runs depmod
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# so blancco-init.sh can use modprobe with proper dependency resolution,
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# and produces a ~20 MB initramfs. Size isn't a concern - HTTP loads it
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# in under two seconds at gigabit, versus the many minutes of hangtime
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# the narrow build cost us when a NIC was unsupported.
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args:
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executable: /bin/bash
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creates: "{{ web_root }}/blancco/kexec-initrd.img"
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shell: |
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set -e
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WORK=$(mktemp -d)
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mkdir -p "$WORK"/{bin,lib/modules,lib64,sbin,usr/share/udhcpc}
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KVER=$(uname -r)
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mkdir -p "$WORK"/{bin,lib/modules/$KVER/kernel,lib64,sbin,usr/share/udhcpc,etc,run,proc,sys,dev}
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# Busybox (static) - bundled on USB at playbook/busybox-static
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if [ -f /bin/busybox ]; then
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cp /bin/busybox "$WORK/bin/"
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cp /bin/busybox "$WORK/bin/busybox"
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elif [ -f "{{ usb_root }}/playbook/busybox-static" ]; then
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cp "{{ usb_root }}/playbook/busybox-static" "$WORK/bin/busybox"
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chmod +x "$WORK/bin/busybox"
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else
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echo "ERROR: No busybox available (not at /bin/busybox or on USB)"
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exit 1
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fi
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for cmd in sh awk cat chmod echo grep gunzip ifconfig ip ln losetup ls mkdir mknod mount reboot route sed sleep switch_root tar udhcpc umount wget cpio; do
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chmod +x "$WORK/bin/busybox"
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# All applets blancco-init.sh uses: modprobe, insmod, dmesg, find, env
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# and export added vs the old narrow list.
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for cmd in sh ash awk cat chmod cp dd echo grep gunzip ifconfig ip insmod ln losetup ls mkdir mknod modprobe mount mv reboot rm rmdir route sed sleep switch_root tar udhcpc umount wget cpio dmesg env export find; do
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ln -sf busybox "$WORK/bin/$cmd"
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done
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# NIC drivers (common server NICs)
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KVER=$(uname -r)
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KMOD="/lib/modules/$KVER/kernel/drivers/net/ethernet"
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for drv in intel/e1000e/e1000e.ko.zst intel/igb/igb.ko.zst broadcom/tg3.ko.zst broadcom/bnx2.ko.zst broadcom/bnxt/bnxt_en.ko.zst broadcom/b44.ko.zst; do
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if [ -f "$KMOD/$drv" ]; then
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zstd -d "$KMOD/$drv" -o "$WORK/lib/modules/$(basename ${drv%.zst})" 2>/dev/null
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# Full drivers/net/ tree - ethernet + phy + mdio + usb + fddi + wan.
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# Preserve path under /lib/modules/$KVER so depmod can resolve deps.
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NETDIR=/lib/modules/$KVER/kernel/drivers/net
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for sub in ethernet mdio phy usb fddi wan; do
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if [ -d "$NETDIR/$sub" ]; then
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mkdir -p "$WORK/lib/modules/$KVER/kernel/drivers/net/$sub"
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cp -r "$NETDIR/$sub/"* "$WORK/lib/modules/$KVER/kernel/drivers/net/$sub/" 2>/dev/null || true
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fi
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done
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# Overlay + squashfs + loop + usb + hid + ptp + mii + net/core deps
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for modpath in fs/overlayfs fs/squashfs drivers/block drivers/usb/core drivers/usb/host drivers/hid drivers/ptp drivers/net/mii.ko net/core; do
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if [ -e "/lib/modules/$KVER/kernel/$modpath" ]; then
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mkdir -p "$WORK/lib/modules/$KVER/kernel/$(dirname $modpath)"
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cp -r "/lib/modules/$KVER/kernel/$modpath" "$WORK/lib/modules/$KVER/kernel/$modpath" 2>/dev/null || true
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fi
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done
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# Overlay module
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OVMOD="/lib/modules/$KVER/kernel/fs/overlayfs/overlay.ko.zst"
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if [ -f "$OVMOD" ]; then
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zstd -d "$OVMOD" -o "$WORK/lib/modules/overlay.ko" 2>/dev/null
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fi
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# Decompress zstd modules in-place (busybox insmod can't handle .zst)
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find "$WORK/lib/modules" -name '*.ko.zst' -print0 | \
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xargs -0 -I {} sh -c 'zstd -d --rm -o "${1%.zst}" "$1" 2>/dev/null' _ {} || true
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# Preserve modules.builtin / modules.order, regenerate modules.dep so
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# modprobe can resolve dependencies inside the initramfs.
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cp /lib/modules/$KVER/modules.builtin "$WORK/lib/modules/$KVER/" 2>/dev/null || true
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cp /lib/modules/$KVER/modules.order "$WORK/lib/modules/$KVER/" 2>/dev/null || true
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(cd "$WORK" && depmod -b . $KVER) 2>/dev/null || echo "depmod warning (non-fatal)"
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# Init script
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cp "{{ usb_root }}/playbook/blancco-init.sh" "$WORK/init"
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@@ -743,7 +767,8 @@
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# Build CPIO
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cd "$WORK"
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find . | cpio -o -H newc 2>/dev/null | gzip > "{{ web_root }}/blancco/kexec-initrd.img"
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find . | cpio -o -H newc --quiet | gzip -1 > "{{ web_root }}/blancco/kexec-initrd.img"
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cd /
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rm -rf "$WORK"
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echo "Built kexec-initrd.img: $(stat -c %s '{{ web_root }}/blancco/kexec-initrd.img') bytes"
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ignore_errors: yes
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Reference in New Issue
Block a user