tests: Install sdboot unsigned for composefs variant

Signed-off-by: Pragyan Poudyal <pragyanpoudyal41999@gmail.com>

Author: Johan-Liebert1

Dockerfile

@@ -144,13 +144,15 @@ RUN --network=none --mount=type=tmpfs,target=/run --mount=type=tmpfs,target=/tmp
 # Perform all filesystem transformations except generating the sealed UKI (if configured)
 FROM base as base-penultimate
 ARG variant
-# Switch to a signed systemd-boot, if configured
+# Switch to systemd-boot (signed or unsigned), if configured
 RUN --network=none --mount=type=tmpfs,target=/run --mount=type=tmpfs,target=/tmp \
     --mount=type=bind,from=packaging,src=/,target=/run/packaging \
     --mount=type=bind,from=sdboot-signed,src=/,target=/run/sdboot-signed <<EORUN
 set -xeuo pipefail
 if test "${variant}" = "composefs-sealeduki-sdboot"; then
   /run/packaging/switch-to-sdboot /run/sdboot-signed
+elif test "${variant}" = "composefs"; then
+  /run/packaging/install-unsigned-sdboot
 fi
 EORUN
 # Configure the rootfs

contrib/packaging/install-unsigned-sdboot

@@ -0,0 +1,13 @@
+#!/bin/bash
+# Install unsigned systemd-boot RPM (already downloaded by tools stage)
+set -xeuo pipefail
+
+# Uninstall bootupd if present (we're switching to sd-boot managed differently)
+if rpm -q bootupd &>/dev/null; then
+  rpm -e bootupd
+  rm -vrf /usr/lib/bootupd/updates
+fi
+
+# Install the unsigned systemd-boot RPM that was downloaded by the tools stage
+# The RPM is available in /run/sdboot-signed/out (copied from tools stage)
+rpm -Uvh /run/sdboot-signed/out/*.rpm

tmt/tests/booted/test-install-to-filesystem-var-mount.sh

@@ -119,7 +119,8 @@ COMPOSEFS_BACKEND=()
 is_composefs=$(bootc status --json | jq '.status.booted.composefs')
 
 if [[ $is_composefs != "null" ]]; then
-    COMPOSEFS_BACKEND=("--composefs-backend")
+    COMPOSEFS_BACKEND+=("--composefs-backend")
+    COMPOSEFS_BACKEND+=("--filesystem=ext4")
 fi
 
 echo "${COMPOSEFS_BACKEND[@]}"