This adds a common way to catch stop exceptions and handles them so error resilient logic does not continue when a stop exception is thrown.
Previously, the logic would only check for `ThreadAbortException` which was used to signal a stop prior to .NET8.
This PR adds a unified way of supplying timeouts to each of the backends.
It also adds an opt-in way of adding commonly used options, so parsing and usage can be standardized across multiple backends.
This adds a retry count and a retry delay for posting backup reports via HTTP requests. This will make the report delivery more reliable if the network is unstable or server is briefly unreachable.
Initially the idea was to allow scanning not only the certificate but scan the whole certificate chain for a explicitly supplied hash to be accepted unconditionally.
A review of the validation revealed it was always missing a fallback to the certificate.verify()
Also decided that even when a hash is supplied and matched, the validity date supersedes other criteria except the acceptAll.
It should be noted that I was unable to completely remove IPv4 on Windows 11 to a state where it would not provide the 127.0.0.1 loopback, even when disabling Ipv4 in various ways, including with registry flags.
On ubuntu/linux, after completely disabling ipv4 the ipv6 loopback was returned.
This removes the use of the `CallContext` substitute, which was a compatibility class from .NET4 times, and replaces it with `AsyncLocal` which retains the call state.
This enables a fail-early approach, where the remote source loads the initial results.
By storing the `IAsyncEnumerable` it is possible to not perform any additional remote calls, even with the initial probing call.
This makes it possible to detect the absence of sources, so the backup can be aborted if sources are missing.
This fixes the restore issues as all sources will now appear as if they were originally part of the source file system.
The backend implementation has now been simplified so the backends only return names of entries with no path information. Most backends already do this, but the S3 backends did not, so this was fixed as well.
This also clears up the interfaces, so the backend does not know about the `ISourceProviderEntry`. All mapping is done by the `BackendSourceProvider`, making it simpler to support other backends as sources.
Made the SMBShareConnection slightly more robust.
Introduced v2 List API to S3 backend, currently it retains v1 as the default.
Changed S3 backends to not recurse, potentially making smaller listings. This option can be disabled if it breaks things.
Added support for relative paths in the SSH backend.
Carl Johnsen