3 files changed, 32 insertions, 2 deletions
diff --git a/tests/functional/qemu_test/asset.py b/tests/functional/qemu_test/asset.py
index e47bfac035..f126cd5863 100644
--- a/tests/functional/qemu_test/asset.py
+++ b/tests/functional/qemu_test/asset.py
@@ -8,6 +8,7 @@
 import hashlib
 import logging
 import os
+import stat
 import subprocess
 import sys
 import unittest
@@ -143,6 +144,8 @@ class Asset:
             raise Exception("Hash of %s does not match %s" %
                             (self.url, self.hash))
         tmp_cache_file.replace(self.cache_file)
+        # Remove write perms to stop tests accidentally modifying them
+        os.chmod(self.cache_file, stat.S_IRUSR | stat.S_IRGRP)
 
         self.log.info("Cached %s at %s" % (self.url, self.cache_file))
         return str(self.cache_file)
diff --git a/tests/functional/qemu_test/tuxruntest.py b/tests/functional/qemu_test/tuxruntest.py
index 904da6f609..f05aa96ad7 100644
--- a/tests/functional/qemu_test/tuxruntest.py
+++ b/tests/functional/qemu_test/tuxruntest.py
@@ -10,6 +10,7 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 import os
+import stat
 import time
 
 from qemu_test import QemuSystemTest
@@ -77,12 +78,17 @@ class TuxRunBaselineTest(QemuSystemTest):
         kernel_image =  kernel_asset.fetch()
         disk_image_zst = rootfs_asset.fetch()
 
+        disk_image = self.workdir + "/rootfs.ext4"
+
         run_cmd([self.zstd, "-f", "-d", disk_image_zst,
-                 "-o", self.workdir + "/rootfs.ext4"])
+                 "-o", disk_image])
+        # zstd copies source archive permissions for the output
+        # file, so must make this writable for QEMU
+        os.chmod(disk_image, stat.S_IRUSR | stat.S_IWUSR)
 
         dtb = dtb_asset.fetch() if dtb_asset is not None else None
 
-        return (kernel_image, self.workdir + "/rootfs.ext4", dtb)
+        return (kernel_image, disk_image, dtb)
 
     def prepare_run(self, kernel, disk, drive, dtb=None, console_index=0):
         """
diff --git a/tests/functional/qemu_test/utils.py b/tests/functional/qemu_test/utils.py
index 2a1cb60d38..1bf1c410d5 100644
--- a/tests/functional/qemu_test/utils.py
+++ b/tests/functional/qemu_test/utils.py
@@ -15,6 +15,27 @@ import shutil
 import subprocess
 import tarfile
 
+"""
+Round up to next power of 2
+"""
+def pow2ceil(x):
+    return 1 if x == 0 else 2**(x - 1).bit_length()
+
+def file_truncate(path, size):
+    if size != os.path.getsize(path):
+        with open(path, 'ab+') as fd:
+            fd.truncate(size)
+
+"""
+Expand file size to next power of 2
+"""
+def image_pow2ceil_expand(path):
+        size = os.path.getsize(path)
+        size_aligned = pow2ceil(size)
+        if size != size_aligned:
+            with open(path, 'ab+') as fd:
+                fd.truncate(size_aligned)
+
 def archive_extract(archive, dest_dir, member=None):
     with tarfile.open(archive) as tf:
         if hasattr(tarfile, 'data_filter'):