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Julien Muchembled authored
An optimization is to avoid temporary file when possible: a rename (or hard link) is not always possible (different mount points). Another one is to not check md5sum twice when using cache file. Fall-back mode is ignored if an MD5 checksum is given. In case of checksum mismatch for a cached path, remove it and download again, mainly to cover the following cases: - the url content changes and the user updates the checksum - buildout killed while downloading directly to cache (see above optimization) - shutil.copyfile is interrupted
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