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Send SIGUSR1 to the agent binary.

Support both single-object and lists when reading handlers and sources
from YAML files in a directory.

When running commands, drop locale- and restic-related environment
variables.

Prevents interactions from the local environment where the test is running.

If disabled, we won't run "restic prune" on the remote
repository. Allows support of append-only repositories.

Fixes issue #1.

Restic 0.9.3 fails when --stdin-filename contains slashes:

repository 954a4e61 opened successfully, password is correct
error: file does not exist
Fatal: unable to save snapshot: snapshot is empty

Covers the whole SourceSpec -> Dataset generation pipeline.

Prevents a panic when nesting WithStatus calls (for whatever reason).

Get rid of the Check(), do it all in Parse().