Maintenance: support for automatic GC
Moved maintenance algorithms from 'cli' to 'repo/maintenance' package
Added support for CLI commands:
kopia gc - performs quick maintenance
kopia gc --full- perform full maintenance
Full maintenance performs snapshot gc, but it's not safe to do this automatically possibly in parallel to snapshots being taken. This will be addressed ~0.7 timeframe.
They now uniformly support 3 flags:
--prefix=P selects contents with the specified prefix
--prefixed selects contents with ANY prefix
--non-prefixed selects non-prefixed contents
Also changed content manager iteration API to support ranges.
cli: add --prefix to 'blob gc' and 'blob stats'
* This is 99% mechanical:
Extracted repo.Repository interface that only exposes high-level object and manifest management methods, but not blob nor content management.
Renamed old *repo.Repository to *repo.DirectRepository
Reviewed codebase to only depend on repo.Repository as much as possible, but added way for low-level CLI commands to use DirectRepository.
* PR fixes
This is mostly mechanical and changes how loggers are instantiated.
Logger is now associated with a context, passed around all methods,
(most methods had ctx, but had to add it in a few missing places).
By default Kopia does not produce any logs, but it can be overridden,
either locally for a nested context, by calling
ctx = logging.WithLogger(ctx, newLoggerFunc)
To override logs globally, call logging.SetDefaultLogger(newLoggerFunc)
This refactoring allowed removing dependency from Kopia repo
and go-logging library (the CLI still uses it, though).
It is now also possible to have all test methods emit logs using
t.Logf() so that they show up in failure reports, which should make
debugging of test failures suck less.
Also introduced strongly typed content.ID and manifest.ID (instead of string)
This aligns identifiers across all layers of repository:
blob.ID
content.ID
object.ID
manifest.ID
