mkosi: use qemu from noble-proposed instead of ppa

This is also temporary, but demonstrates that the version of qemu
currently in noble-proposed fixes https://launchpad.net/bugs/2127974,
which will ultimately allow for the fix to be released to noble-updates.

mkosi/mkosi.tools.conf/mkosi.conf.d/ubuntu/mkosi.sandbox/etc/apt/preferences.d/qemu-noble-proposed.pref

@@ -0,0 +1,3 @@
+Package: src:qemu:any
+Pin: release a=noble-proposed
+Pin-Priority: 550

mkosi/mkosi.tools.conf/mkosi.conf.d/ubuntu/mkosi.sandbox/etc/apt/sources.list.d/noble-proposed.sources

@@ -0,0 +1,5 @@
+Types: deb deb-src
+URIs: http://archive.ubuntu.com/ubuntu/
+Suites: noble-proposed
+Components: main universe
+Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg

mkosi/mkosi.tools.conf/mkosi.sandbox/etc/apt/sources.list.d/qemu.sources

@@ -1,34 +0,0 @@
-Types: deb
-URIs: https://ppa.launchpadcontent.net/enr0n/qemu/ubuntu/
-Suites: noble
-Components: main
-Signed-By:
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test/integration-tests/integration-test-wrapper.py

@@ -75,6 +75,18 @@ class Summary:
         )
 
 
+def tools_os_release(field: str) -> str:
+    return subprocess.run(
+        [
+            'bash',
+            '-c',
+            f'set -eu; . /etc/os-release; echo ${field}',
+        ],
+        stdout=subprocess.PIPE,
+        text=True,
+    ).stdout.rstrip()
+
+
 def process_coredumps(args: argparse.Namespace, journal_file: Path) -> bool:
     # Collect executable paths of all coredumps and filter out the expected ones.
 
@@ -618,11 +630,11 @@ def main() -> None:
     # XXX: debug for https://github.com/systemd/systemd/issues/38240
     if vm:
         # Tracing is not supported in centos/fedora qemu builds
-        if summary.distribution in ('centos', 'fedora'):
+        if tools_os_release('ID') in ('centos', 'fedora'):
             cmd += ['--qemu-args=-d cpu_reset,guest_errors -D /dev/stderr']
         else:
             cmd += [
-                '--qemu-args=-d cpu_reset,guest_errors,trace:kvm_run_exit_system_event,trace:qemu_system_\*_request -D /dev/stderr'  # noqa: E501
+                '--qemu-args=-d cpu_reset,guest_errors,trace:kvm_run_exit_system_event,trace:qemu_system_*_request -D /dev/stderr'  # noqa: E501
             ]
 
     try: