* feat(backends/s3): add warmup support before repacks and restores
This commit introduces basic support for transitioning pack files stored
in cold storage to hot storage on S3 and S3-compatible providers.
To prevent unexpected behavior for existing users, the feature is gated
behind new flags:
- `s3.enable-restore`: opt-in flag (defaults to false)
- `s3.restore-days`: number of days for the restored objects to remain
in hot storage (defaults to `7`)
- `s3.restore-timeout`: maximum time to wait for a single restoration
(default to `1 day`)
- `s3.restore-tier`: retrieval tier at which the restore will be
processed. (default to `Standard`)
As restoration times can be lengthy, this implementation preemptively
restores selected packs to prevent incessant restore-delays during
downloads. This is slightly sub-optimal as we could process packs
out-of-order (as soon as they're transitioned), but this would really
add too much complexity for a marginal gain in speed.
To maintain simplicity and prevent resources exhautions with lots of
packs, no new concurrency mechanisms or goroutines were added. This just
hooks gracefully into the existing routines.
**Limitations:**
- Tests against the backend were not written due to the lack of cold
storage class support in MinIO. Testing was done manually on
Scaleway's S3-compatible object storage. If necessary, we could
explore testing with LocalStack or mocks, though this requires further
discussion.
- Currently, this feature only warms up before restores and repacks
(prune/copy), as those are the two main use-cases I came across.
Support for other commands may be added in future iterations, as long
as affected packs can be calculated in advance.
- The feature is gated behind a new alpha `s3-restore` feature flag to
make it explicit that the feature is still wet behind the ears.
- There is no explicit user notification for ongoing pack restorations.
While I think it is not necessary because of the opt-in flag, showing
some notice may improve usability (but would probably require major
refactoring in the progress bar which I didn't want to start). Another
possibility would be to add a flag to send restores requests and fail
early.
See https://github.com/restic/restic/issues/3202
* ui: warn user when files are warming up from cold storage
* refactor: remove the PacksWarmer struct
It's easier to handle multiple handles in the backend directly, and it
may open the door to reducing the number of requests made to the backend
in the future.
The old sorting behaviour was to sort snapshots from oldest to newest.
The new sorting order is from newest to oldest. If one wants to revert to the
old behaviour, use the option --reverse.
---------
Co-authored-by: Michael Eischer <michael.eischer@fau.de>
* tag: output the original ID and new snapshotID
tag: print changed snapshot information immediately
* print changed snapshot immediately after it has been saved
* add message type to the changedSnapshot
* add a summary type which will share the JSON output of the numer of changed snapshots
* updated verbosity of the changed snapshot in text mode to only work when verbosity > 2
* also use the terminal status printer for a standard handling for stdout messages
Those methods now only allow modifying snapshots. Internal data types
used by the repository are now read-only. The repository-internal code
can bypass the restrictions by wrapping the repository in an
`internalRepository` type.
The restriction itself is implemented by using a new datatype
WriteableFileType in the SaveUnpacked and RemoveUnpacked methods. This
statically ensures that code cannot bypass the access restrictions.
The test changes are somewhat noisy as some of them modify repository
internals and therefore require some way to bypass the access
restrictions. This works by capturing an `internalRepository` or
`Backend` when creating the Repository using a test helper function.
This fixes an issue where restic cannot find the tree when trying to find the
tree id of a snapshot.
---------
Co-authored-by: Albin Vass <albinvass@gmail.com>
Co-authored-by: Michael Eischer <michael.eischer@fau.de>
* On Linux restore only user.* xattrs by default
* restore all for other OSs
* Update docs and changelog about the new restore
flags --exclude-xattr and --include-xattr
Signed-off-by: Tesshu Flower <tflower@redhat.com>
By now missing files are not endlessly retried by the retry backend such
that it can be enabled right from the start.
In addition, this change also enables the retry backend for the `init`
command.
