This puts all content blocks with non-empty prefix into starting with
`q` instead of `p`. This neatly separates all data (p) from metadata
(q) at the storage level and allows different storage policies, since
most data is not going to be ever accessed ever, but metadata is going
to be read a lot..
We can more aggressively cache contents from `q`.
Tests are failing because pkg/sftp won't overwrite an existing file
(Rename function) and the test is actually doing that with
blobtesting.VerifyStorage.
The solution is to use pkg/sftp's PosixRename function:
"PosixRename renames a file using the posix-rename@openssh.com
extension which will replace newname if it already exists."
Additionally, the provider now creates the path on the server, if it
doesn't exist.
Repository.Token() generates a base64-encoded token that can
be stored in password manager that fully describes repository connection
information (blob.ConnectionInfo) and optionally a password.
Use `kopia repo status -t` to print the token.
Use `kopia repo status -t -s` to print the token that also includes
repository password.
Use `kopia repo connect from-config --token T` to reconnect using the
token.
Uses go/ssh and pkg/sftp as building blocks and implements the common
sharded.Storage interface, shared between the filesystem and webdav
providers.
A couple of notes:
- The provider assumes the user has a working public/private key
connection to the ssh server.
No other authentication method is supported
- The repository path must exist on the server
- (testing related) The pkg/sftp server doesn't offer a way to set a
server filesystem root, so, during testing, it runs from the local
directory which is repo/blob/sftp. So the tests leave some debris
behind. Additionally, that's the reason why id_rsa and known_hosts
are there at all.
- Encrypted keyfiles are currently not supported (but it could be done)
This cleans up the code a lot and removes many ugly hacks.
The performance is pretty reasonable and with separate metadata cache it's likely to stay that way.
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
This updates the terminology everywhere - blocks become blobs and
`storage.Storage` becomes `blob.Storage`.
Also introduced blob.ID which is a specialized string type, that's
different from CABS block ID.
Also renamed CLI subcommands from `kopia storage` to `kopia blob`.
While at it introduced `block.ErrBlockNotFound` and
`object.ErrObjectNotFound` that do not leak from lower layers.
This allows authenticated encryption, custom IVs and checksums.
Implemented SALSA20-HMAC and XSALSA20-HMAC which append HMAC-SHA256
checksum to the ciphertext.
