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Use symlinks instead of copies for test result_images. #10222

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Merged
dstansby merged 1 commit into from
Jun 18, 2019
Merged

Use symlinks instead of copies for test result_images. #10222

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19 changes: 12 additions & 7 deletions lib/matplotlib/testing/decorators.py
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Original file line number Diff line number Diff line change
Expand Up @@ -192,13 +192,18 @@ def copy_baseline(self, baseline, extension):
os.path.join(self.result_dir,
os.path.basename(orig_expected_fname)),
'expected')
if os.path.exists(orig_expected_fname):
shutil.copyfile(orig_expected_fname, expected_fname)
else:
reason = ("Do not have baseline image {} because this "
"file does not exist: {}".format(expected_fname,
orig_expected_fname))
raise ImageComparisonFailure(reason)
try:
# os.symlink errors if the target already exists.
with contextlib.suppress(OSError):
os.remove(expected_fname)
try:
os.symlink(orig_expected_fname, expected_fname)
except OSError: # On Windows, symlink *may* be unavailable.
shutil.copyfile(orig_expected_fname, expected_fname)
except OSError:
raise ImageComparisonFailure(
f"Missing baseline image {expected_fname} because the "
f"following file cannot be accessed: {orig_expected_fname}")
return expected_fname

def compare(self, idx, baseline, extension):
Expand Down