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'owner' and 'group' can be used to define an owner and a group for the
archive that is being built. If not provided, the current owner and group
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extension; 'format' is the archive format: one of "zip", "tar", "gztar",
"bztar", "xztar", or "ztar".
'root_dir' is a directory that will be the root directory of the
archive; ie. we typically chdir into 'root_dir' before creating the
archive. 'base_dir' is the directory where we start archiving from;
ie. 'base_dir' will be the common prefix of all files and
directories in the archive. 'root_dir' and 'base_dir' both default
to the current directory. Returns the name of the archive file.
'owner' and 'group' are used when creating a tar archive. By default,
uses the current owner and group.
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