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fix: wrap formatwarning() to use relative paths #4441

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fix: wrap formatwarning() to use relative paths #4441

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21 changes: 21 additions & 0 deletions python/private/stage2_bootstrap_template.py
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@
import runpy
import types
import uuid
import warnings
from functools import cache

# ===== Template substitutions start =====
Expand Down Expand Up @@ -585,4 +586,24 @@ def main():
sys.exit(0)


# To help eliminate nondeterministic output, particularly when remotely
# executing, we here wrap Python's formatwarning() to cause it to
# produce paths relative to the current directory as of the launch of
# the executable.

original_formatwarning = warnings.formatwarning
original_cwd = os.getcwd()


def relpath_formatwarning(message, category, filename, lineno, line=None):
relative_filename = (
os.path.relpath(filename, original_cwd) if os.path.isabs(filename) else filename
)
return original_formatwarning(
message, category, relative_filename, lineno, line=line
)


warnings.formatwarning = relpath_formatwarning

main()
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