Add absolute_import from __future__ so that pylint
does not fail and to achieve python3 behavior in
python2.
Reviewed-By: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
FileStore.backup_file() docstring claimed not to store a
copy of the same file but the behavior of the method did not
match this description.
This commit makes the backed-up file filename derivation
deterministic by hashing its content by SHA-256, thus it
should not back up two files with the same filename and content.
Reviewed-By: Aleksei Slaikovskii <aslaikov@redhat.com>
Christian Heimes
Stanislav Laznicka
Jan Cholasta
Martin Basti