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Make Hierarchy.write_metadata() an atomic operation

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This commit is contained in:
Eric Torres 2019-04-01 10:41:01 -07:00
parent 4361ad703a
commit e58c6b7c27
1 changed files with 9 additions and 2 deletions
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11
rbackup/hierarchy/hierarchy.py
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@ -100,11 +100,18 @@ class Hierarchy:
return pickle.load(mfile)
def write_metadata(self):
"""Write this repository's metadata to its file."""
"""Write this repository's metadata to its file.
Note that this write operation is atomic to the caller.
"""
syslog.debug(f"Writing metadata to {self.metadata_path}")
with self.metadata_path.open(mode=METADATA_WRITE) as mfile:
tmpfile = self.metadata_path.with_suffix('.tmp')
with tmpfile.open(mode=METADATA_WRITE) as mfile:
pickle.dump(self._data, mfile)
tmpfile.rename(self.metadata_path)
# ========== Functions ==========
if __name__ == "__main__":