[PATCH v5 03/13] CI: Add driver domains tests

Setup a simple two domU system. One with network backend, running
xendriverdomain service, and one with frontend, trying to ping the
backend.

Contrary to other similar tests, use disk image instead of initrd, to
allow bigger rootfs without adding more RAM (for both dom0 and domU).
But keep using pxelinux as a bootloader as it's easier to setup than
installing grub on the disk. Theoretically, it could be started via direct
kernel boot in QEMU, but pxelinux is slightly closer to real-world
deployment.

Use fakeroot to preserve file owners/permissions. This is especially
important for suid binaries like /bin/mount - without fakeroot, they
will end up as suid into non-root user.

Signed-off-by: Marek Marczykowski-Górecki <[email protected]>
---
Changes in v5:
- add code comment about sparse files
Changes in v3:
- add fakeroot
- run ldconfig at the disk image creation time, to avoid running it at
  dom0/domU boot time (which is much slower)
Changes in v2:
- use heredoc
- limit ping loop iterations
- use full "backend" / "frontend" in disk image names
- print domU consoles directly to /dev/console, to avoid systemd-added
  messages prefix
- terminate test on failure, don't wait for timeout

Needs debian/13-x86_64 container rebuild.
---
 automation/build/debian/13-x86_64.dockerfile    |   2 +-
 automation/gitlab-ci/test.yaml                  |   8 +-
 automation/scripts/qemu-driverdomains-x86_64.sh | 135 +++++++++++++++++-
 3 files changed, 145 insertions(+)
 create mode 100755 automation/scripts/qemu-driverdomains-x86_64.sh

diff --git a/automation/build/debian/13-x86_64.dockerfile b/automation/build/debian/13-x86_64.dockerfile
index 784299d52dc3..5088f7435c1e 100644
--- a/automation/build/debian/13-x86_64.dockerfile
+++ b/automation/build/debian/13-x86_64.dockerfile
@@ -56,7 +56,9 @@ RUN <<EOF
 
         # for test phase, qemu-* jobs
         busybox-static
+        e2fsprogs
         expect
+        fakeroot
         ovmf
         qemu-system-x86
 
diff --git a/automation/gitlab-ci/test.yaml b/automation/gitlab-ci/test.yaml
index 61adc1baff30..566d1f4287d7 100644
--- a/automation/gitlab-ci/test.yaml
+++ b/automation/gitlab-ci/test.yaml
@@ -733,6 +733,14 @@ qemu-alpine-x86_64-gcc:
     - *x86_64-test-needs
     - alpine-3.24-x86_64-gcc
 
+qemu-alpine-driverdomains-x86_64-gcc:
+  extends: .qemu-x86_64
+  script:
+    - ./automation/scripts/qemu-driverdomains-x86_64.sh 2>&1 | tee ${LOGFILE}
+  needs:
+    - *x86_64-test-needs
+    - alpine-3.24-x86_64-gcc
+
 qemu-smoke-x86_64-gcc:
   extends: .qemu-smoke-x86_64
   script:
diff --git a/automation/scripts/qemu-driverdomains-x86_64.sh b/automation/scripts/qemu-driverdomains-x86_64.sh
new file mode 100755
index 000000000000..bada6599842e
--- /dev/null
+++ b/automation/scripts/qemu-driverdomains-x86_64.sh
@@ -0,0 +1,135 @@
+#!/bin/bash
+
+set -ex -o pipefail
+
+cd binaries
+
+# DomU rootfs
+
+mkdir -p rootfs
+cd rootfs
+mkdir -p etc/local.d
+passed="ping test passed"
+failed="TEST FAILED"
+cat > etc/local.d/xen.start << EOF
+#!/bin/bash
+
+set -x
+
+if grep -q test=backend /proc/cmdline; then
+    brctl addbr xenbr0
+    ip link set xenbr0 up
+    ip addr add 192.168.0.1/24 dev xenbr0
+    bash /etc/init.d/xendriverdomain start
+    # log backend-related logs to the console
+    tail -F /var/log/xen/xldevd.log /var/log/xen/xen-hotplug.log >>/dev/console 2>/dev/null &
+else
+    ip link set eth0 up
+    ip addr add 192.168.0.2/24 dev eth0
+    timeout=6 # 6*10s
+    until ping -c 10 192.168.0.1; do
+        sleep 1
+        if [ \$timeout -le 0 ]; then
+            echo "${failed}"
+            exit 1
+        fi
+        ((timeout--))
+    done
+    echo "${passed}"
+fi
+EOF
+chmod +x etc/local.d/xen.start
+fakeroot sh -c "
+    zcat ../rootfs.cpio.gz | cpio -imd
+    zcat ../xen-tools.cpio.gz | cpio -imd
+    ldconfig -r .
+    touch etc/.updated
+    # this is a sparse file, not really using full 1GiB
+    mkfs.ext4 -d . ../domU-rootfs.img 1024M
+"
+cd ..
+rm -rf rootfs
+
+# Dom0 rootfs
+mkdir -p rootfs
+cd rootfs
+fakeroot -s ../fakeroot-save sh -c "
+    zcat ../rootfs.cpio.gz | cpio -imd
+    zcat ../xen-tools.cpio.gz | cpio -imd
+    ldconfig -r .
+    touch etc/.updated
+"
+mkdir -p root etc/local.d
+cat > root/backend.cfg << EOF
+name="backend"
+memory=512
+vcpus=1
+kernel="/root/bzImage"
+extra="console=hvc0 root=/dev/xvda net.ifnames=0 test=backend"
+disk=[ '/root/domU-rootfs-backend.img,raw,xvda,rw' ]
+EOF
+cat > root/frontend.cfg << EOF
+name="frontend"
+memory=512
+vcpus=1
+kernel="/root/bzImage"
+extra="console=hvc0 root=/dev/xvda net.ifnames=0 test=frontend"
+disk=[ '/root/domU-rootfs-frontend.img,raw,xvda,rw' ]
+vif=[ 'bridge=xenbr0,backend=backend' ]
+EOF
+
+cat > etc/local.d/xen.start << EOF
+#!/bin/bash
+
+set -x
+
+bash /etc/init.d/xencommons start
+
+xl list
+
+tail -F /var/log/xen/console/guest-backend.log 2>/dev/null | sed -e "s/^/(backend) /" >>/dev/console &
+tail -F /var/log/xen/console/guest-frontend.log 2>/dev/null | sed -e "s/^/(frontend) /" >>/dev/console &
+xl -vvv create /root/backend.cfg
+xl -vvv create /root/frontend.cfg
+EOF
+chmod +x etc/local.d/xen.start
+
+cp ../domU-rootfs.img ./root/domU-rootfs-backend.img
+cp ../domU-rootfs.img ./root/domU-rootfs-frontend.img
+cp ../bzImage ./root/
+mkdir -p etc/default
+echo 'XENCONSOLED_TRACE=all' >> etc/default/xencommons
+mkdir -p var/log/xen/console
+# this is a sparse file, not really using full 2GiB
+fakeroot -i ../fakeroot-save mkfs.ext4 -d . ../dom0-rootfs.img 2048M
+cd ..
+rm -rf rootfs
+
+cd ..
+
+cat >> binaries/pxelinux.0 << EOF
+#!ipxe
+
+kernel xen console=com1 console_timestamps=boot
+module bzImage console=hvc0 root=/dev/sda net.ifnames=0
+boot
+EOF
+
+# Run the test
+rm -f smoke.serial
+export TEST_CMD="qemu-system-x86_64 \
+    -cpu qemu64,+svm \
+    -m 2G -smp 2 \
+    -monitor none -serial stdio \
+    -nographic \
+    -device virtio-net-pci,netdev=n0 \
+    -netdev user,id=n0,tftp=binaries,bootfile=/pxelinux.0 \
+    -drive file=binaries/dom0-rootfs.img,format=raw"
+
+export TEST_LOG="smoke.serial"
+export BOOT_MSG="Latest ChangeSet: "
+# exit early on test failure too, check if it was success below
+export LOG_MSG="$passed|$failed"
+export PASSED="$passed"
+
+./automation/scripts/console.exp | sed 's/\r\+$//'
-- 
git-series 0.9.1