In tar, the entry header contains the file size. If we don't provide it those many bytes, the tar will become corrupt
Linux provides no guarantee of how many bytes can be read from a file. This is the case with sqlite and log files
which are accessed by other processes when tar is in action. This class handles overflow and underflow
we will switch over our tgz module to node-tar. Main advantage is that
it is used by npm. Currently, we have our own fork to ignore stat errors
in the other module.
unfortunately, I cannot get this to work with the create logic. It doesn't
support path modification - https://github.com/isaacs/node-tar/issues/271
so, will revert this immediately and keep this for future
notes:
* backup root cannot come from backend. for dynamic mounts backend cannot know where it is mounted
* backupConfig is 3 parts - format / mount / password . there is also this rootPath (which should not be in db)
* password should be stored separately in settings at some point
* format has to be passed along everywhere because we allow restore from same backupConfig but different format. we do this by saving the format in the backups table
fixes#819
