This helper wrappers utils.uncompress, forcing the use of the scratch
directory, to ensure any uncompressed files are cleaned at test
termination.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 tests/functional/qemu_test/testcase.py | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/tests/functional/qemu_test/testcase.py b/tests/functional/qemu_test/testcase.py
index 19fb1d0c07..d0bb3141d5 100644
--- a/tests/functional/qemu_test/testcase.py
+++ b/tests/functional/qemu_test/testcase.py
@@ -29,6 +29,7 @@
 from .asset import Asset
 from .cmd import run_cmd
 from .config import BUILD_DIR
+from .uncompress import uncompress
 
 
 class QemuBaseTest(unittest.TestCase):
@@ -40,6 +41,30 @@ class QemuBaseTest(unittest.TestCase):
     log = None
     logdir = None
 
+    '''
+    @params compressed: filename, Asset, or file-like object to uncompress
+    @params format: optional compression format (gzip, lzma)
+
+    Uncompresses @compressed into the scratch directory.
+
+    If @format is None, heuristics will be applied to guess the format
+    from the filename or Asset URL. @format must be non-None if @uncompressed
+    is a file-like object.
+
+    Returns the fully qualified path to the uncompressed file
+    '''
+    def uncompress(self, compressed, format=None):
+        self.log.debug(f"Uncompress {compressed} format={format}")
+        if type(compressed) == Asset:
+            compressed.fetch()
+
+        (name, ext) = os.path.splitext(str(compressed))
+        uncompressed = self.scratch_file(os.path.basename(name))
+
+        uncompress(compressed, uncompressed, format)
+
+        return uncompressed
+
     '''
     @params archive: filename, Asset, or file-like object to extract
     @params format: optional archive format (tar, zip, deb, cpio)
-- 
2.46.0