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[PATCH v4 06/18] iotests: add qemu_img_json()
From: |
John Snow |
Subject: |
[PATCH v4 06/18] iotests: add qemu_img_json() |
Date: |
Thu, 17 Mar 2022 19:49:25 -0400 |
qemu_img_json() is a new helper built on top of qemu_img() that tries to
pull a valid JSON document out of the stdout stream.
In the event that the return code is negative (the program crashed), or
the code is greater than zero and did not produce valid JSON output, the
VerboseProcessError raised by qemu_img() is re-raised.
In the event that the return code is zero but we can't parse valid JSON,
allow the JSON deserialization error to be raised.
Signed-off-by: John Snow <jsnow@redhat.com>
---
tests/qemu-iotests/iotests.py | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 7057db0686..9d23066701 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -276,6 +276,38 @@ def ordered_qmp(qmsg, conv_keys=True):
def qemu_img_create(*args: str) -> subprocess.CompletedProcess[str]:
return qemu_img('create', *args)
+def qemu_img_json(*args: str) -> Any:
+ """
+ Run qemu-img and return its output as deserialized JSON.
+
+ :raise CalledProcessError:
+ When qemu-img crashes, or returns a non-zero exit code without
+ producing a valid JSON document to stdout.
+ :raise JSONDecoderError:
+ When qemu-img returns 0, but failed to produce a valid JSON document.
+
+ :return: A deserialized JSON object; probably a dict[str, Any].
+ """
+ try:
+ res = qemu_img(*args, combine_stdio=False)
+ except subprocess.CalledProcessError as exc:
+ # Terminated due to signal. Don't bother.
+ if exc.returncode < 0:
+ raise
+
+ # Commands like 'check' can return failure (exit codes 2 and 3)
+ # to indicate command completion, but with errors found. For
+ # multi-command flexibility, ignore the exact error codes and
+ # *try* to load JSON.
+ try:
+ return json.loads(exc.stdout)
+ except json.JSONDecodeError:
+ # Nope. This thing is toast. Raise the /process/ error.
+ pass
+ raise
+
+ return json.loads(res.stdout)
+
def qemu_img_measure(*args):
return json.loads(qemu_img_pipe("measure", "--output", "json", *args))
--
2.34.1
- [PATCH v4 00/18] iotests: add enhanced debugging info to qemu-img failures, John Snow, 2022/03/17
- [PATCH v4 03/18] iotests: Remove explicit checks for qemu_img() == 0, John Snow, 2022/03/17
- [PATCH v4 02/18] python/utils: add VerboseProcessError, John Snow, 2022/03/17
- [PATCH v4 05/18] iotests: fortify compare_images() against crashes, John Snow, 2022/03/17
- [PATCH v4 06/18] iotests: add qemu_img_json(),
John Snow <=
- [PATCH v4 08/18] iotests: add qemu_img_info(), John Snow, 2022/03/17
- [PATCH v4 07/18] iotests: use qemu_img_json() when applicable, John Snow, 2022/03/17
- [PATCH v4 10/18] iotests: add qemu_img_map() function, John Snow, 2022/03/17
- [PATCH v4 15/18] iotests: use qemu_img() in has_working_luks(), John Snow, 2022/03/17
- [PATCH v4 01/18] python/utils: add add_visual_margin() text decoration utility, John Snow, 2022/03/17
- [PATCH v4 09/18] iotests/remove-bitmap-from-backing: use qemu_img_info(), John Snow, 2022/03/17
- [PATCH v4 12/18] iotests: replace unchecked calls to qemu_img_pipe(), John Snow, 2022/03/17