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[PATCH v5 05/18] iotests: fortify compare_images() against crashes
From: |
John Snow |
Subject: |
[PATCH v5 05/18] iotests: fortify compare_images() against crashes |
Date: |
Mon, 21 Mar 2022 16:16:05 -0400 |
Fortify compare_images() to be more discerning about the status codes it
receives. If qemu_img() returns an exit code that implies it didn't
actually perform the comparison, treat that as an exceptional
circumstance and force the caller to be aware of the peril.
If a negative test is desired (perhaps to test how qemu_img compare
behaves on malformed images, for instance), it is still possible to
catch the exception in the test and deal with that circumstance
manually.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
---
tests/qemu-iotests/iotests.py | 21 ++++++++++++++++-----
1 file changed, 16 insertions(+), 5 deletions(-)
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 4afe63df07..9351f9c6ac 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -507,11 +507,22 @@ def qemu_nbd_popen(*args):
p.kill()
p.wait()
-def compare_images(img1, img2, fmt1=imgfmt, fmt2=imgfmt):
- '''Return True if two image files are identical'''
- res = qemu_img('compare', '-f', fmt1,
- '-F', fmt2, img1, img2, check=False)
- return res.returncode == 0
+def compare_images(img1: str, img2: str,
+ fmt1: str = imgfmt, fmt2: str = imgfmt) -> bool:
+ """
+ Compare two images with QEMU_IMG; return True if they are identical.
+
+ :raise CalledProcessError:
+ when qemu-img crashes or returns a status code of anything other
+ than 0 (identical) or 1 (different).
+ """
+ try:
+ qemu_img('compare', '-f', fmt1, '-F', fmt2, img1, img2)
+ return True
+ except subprocess.CalledProcessError as exc:
+ if exc.returncode == 1:
+ return False
+ raise
def create_image(name, size):
'''Create a fully-allocated raw image with sector markers'''
--
2.34.1
- [PATCH v5 00/18] iotests: add enhanced debugging info to qemu-img failures, John Snow, 2022/03/21
- [PATCH v5 01/18] python/utils: add add_visual_margin() text decoration utility, John Snow, 2022/03/21
- [PATCH v5 05/18] iotests: fortify compare_images() against crashes,
John Snow <=
- [PATCH v5 07/18] iotests: use qemu_img_json() when applicable, John Snow, 2022/03/21
- [PATCH v5 02/18] python/utils: add VerboseProcessError, John Snow, 2022/03/21
- [PATCH v5 06/18] iotests: add qemu_img_json(), John Snow, 2022/03/21
- [PATCH v5 09/18] iotests/remove-bitmap-from-backing: use qemu_img_info(), John Snow, 2022/03/21
- [PATCH v5 04/18] iotests: make qemu_img raise on non-zero rc by default, John Snow, 2022/03/21
- [PATCH v5 03/18] iotests: Remove explicit checks for qemu_img() == 0, John Snow, 2022/03/21
- [PATCH v5 11/18] iotests: change supports_quorum to use qemu_img, John Snow, 2022/03/21
- [PATCH v5 08/18] iotests: add qemu_img_info(), John Snow, 2022/03/21
- [PATCH v5 12/18] iotests: replace unchecked calls to qemu_img_pipe(), John Snow, 2022/03/21
- [PATCH v5 13/18] iotests/149: Remove qemu_img_pipe() call, John Snow, 2022/03/21