FDS/OS 1.0

tools/make-stage0-vm

@@ -0,0 +1,42 @@
+#!/usr/bin/env python3
+"""Build an isolated EROFS boot fixture using the exported s6 graph unchanged."""
+import io
+from pathlib import Path
+import subprocess
+import sys
+import tarfile
+
+project = Path(__file__).resolve().parents[1]
+if len(sys.argv) != 2:
+    sys.exit('Usage: tools/make-stage0-vm EMPTY_WORK_DIRECTORY')
+work = Path(sys.argv[1]).resolve(strict=True)
+if not work.is_dir() or any(work.iterdir()):
+    sys.exit('ERROR: expected an existing empty work directory')
+stage2 = 'etc/s6-linux-init/current/scripts/rc.init'
+wrapper = (f'#!/bin/bash\nset -euo pipefail\n/{stage2}.fds-base "$@"\n'
+           'export FDS_TEST_ROOT_TYPE=erofs\n'
+           '/usr/libexec/fds/m4-guest\n'
+           'exec /usr/libexec/fds/m2-guest\n').encode()
+found = False
+with tarfile.open(project/'out/rootfs-cli.tar') as source, tarfile.open(work/'test-rootfs.tar', 'w', format=tarfile.PAX_FORMAT) as output:
+    for member in source:
+        if member.name == stage2:
+            member.name += '.fds-base'
+            found = True
+        output.addfile(member, source.extractfile(member) if member.isfile() else None)
+    if not found:
+        sys.exit('ERROR: native stage-2 script missing')
+    hook = tarfile.TarInfo(stage2)
+    hook.mode = 0o755
+    hook.size = len(wrapper)
+    output.addfile(hook, io.BytesIO(wrapper))
+    def root_owned(info):
+        info.uid = info.gid = 0
+        info.uname = info.gname = ''
+        return info
+    for name in ('m2-guest', 'm4-guest'):
+        output.add(project/'tests/integration'/name, arcname='usr/libexec/fds/'+name, filter=root_owned)
+(work/'system').mkdir()
+subprocess.run([str(project/'image/build-system-cartridge'), '--rootfs', str(work/'test-rootfs.tar'),
+                '--output-directory', str(work/'system')], check=True)
+print(f'PASS: stage0 VM fixture created at {work}')