while SSH options can be specified through `~/.ssh/config`, some users
may want to use a completely different SSH command for their backups,
without overriding their $PATH variable. it may also be easier to do
ad-hoc configuration and tests that way.
plus, the POLA tells us that users expects something like this to be
supported by commands that talk to ssh. it is supported by rsync, git
and so on.
the reasoning behind this is that we may need to test a
RemoteRepository setup outside of the main archiver routines, which
the current default location makes impossible
by moving the umask and remote_path remotes into the RemoteRepository
the (reasonable) defaults are available regardless of the (currently
obscure) initialisation routine, and make unit tests easier to develop
and support
Code shared by read() and iter_objects() was moved into _read().
Compared to read()'s previous state, this improved:
- fixed size check to avoid read with negative size
- exception handler for struct unpack
- checking for short read
- more precise exception messages
it seems the file cache does *not* have the ATTIC magic header (nor
does it have one in borg), so we don't need to edit the file - we just
copy it like a regular file.
while i'm here, simplify the cache conversion loop: it's no use
splitting the copy and the edition since the latter is so fast, just
do everything in one loop, which makes it much easier to read.
convert is too generic for the Attic conversion: we may have other
converters, from other, more foreign systems that will require
different options and different upgrade mechanisms that convert could
never cover appropriately. we are more likely to use an approach
similar to "git fast-import" instead here, and have the conversion
tools be external tool that feed standard data into borg during
conversion.
upgrade seems like a more natural fit: Attic could be considered like
a pre-historic version of Borg that requires invasive changes for borg
to be able to use the repository. we may require such changes in the
future of borg as well: if we make backwards-incompatible changes to
the repository layout or data format, it is possible that we require
such changes to be performed on the repository before it is usable
again. instead of scattering those conversions all over the code, we
should simply have assertions that check the layout is correct and
point the user to upgrade if it is not.
upgrade should eventually automatically detect the repository format
or version and perform appropriate conversions. Attic is only the
first one. we still need to implement an adequate API for
auto-detection and upgrade, only the seeds of that are present for now.
of course, changes to the upgrade command should be thoroughly
documented in the release notes and an eventual upgrade manual.
we separate the conversion and the copy in order to be able to copy
arbitrary files from attic without converting them. this allows us to
copy the config file cleanly without attempting to rewrite its magic
number
- issue #234: handle exception when config file is empty is really not a borg cache config
- there was a unused %s in the Exception string
- error msg was wrong when version check failed - this IS a borg cache, but not of expected version
