This helper wrappers archive.archive_extract, forcing the use of the
scratch directory, to ensure any extracted files are cleaned at test
termination. If a specific member is requested, then the path to the
extracted file is also returned.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 tests/functional/qemu_test/testcase.py | 32 ++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/tests/functional/qemu_test/testcase.py b/tests/functional/qemu_test/testcase.py
index 493938240c..19fb1d0c07 100644
--- a/tests/functional/qemu_test/testcase.py
+++ b/tests/functional/qemu_test/testcase.py
@@ -25,6 +25,7 @@
 from qemu.machine import QEMUMachine
 from qemu.utils import kvm_available, tcg_available
 
+from .archive import archive_extract
 from .asset import Asset
 from .cmd import run_cmd
 from .config import BUILD_DIR
@@ -39,6 +40,37 @@ class QemuBaseTest(unittest.TestCase):
     log = None
     logdir = None
 
+    '''
+    @params archive: filename, Asset, or file-like object to extract
+    @params format: optional archive format (tar, zip, deb, cpio)
+    @params sub_dir: optional sub-directory to extract into
+    @params member: optional member file to limit extraction to
+
+    Extracts @archive into the scratch directory, or a directory beneath
+    named by @sub_dir. All files are extracted unless @member specifies
+    a limit.
+
+    If @format is None, heuristics will be applied to guess the format
+    from the filename or Asset URL. @format must be non-None if @archive
+    is a file-like object.
+
+    If @member is non-None, returns the fully qualified path to @member
+    '''
+    def archive_extract(self, archive, format=None, sub_dir=None, member=None):
+        self.log.debug(f"Extract {archive} format={format}" +
+                       f"sub_dir={sub_dir} member={member}")
+        if type(archive) == Asset:
+            archive.fetch()
+        if sub_dir is None:
+            archive_extract(archive, self.scratch_file(), format, member)
+        else:
+            archive_extract(archive, self.scratch_file(sub_dir),
+                            format, member)
+
+        if member is not None:
+            return self.scratch_file(member)
+        return None
+
     '''
     Create a temporary directory suitable for storing UNIX
     socket paths.
-- 
2.46.0