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21.

The debug command contains a selection of additional sub-commands.

Debug commands can be removed without notice and may not work on
non-development systems.

22.

The delete-key command deletes the local cryptographic key pair with
the given name.

23.

The disable command disables a snap. The binaries and services of the
snap will no longer be available, but all the data is still available
and the snap can easily be enabled again.

24.

The disconnect command disconnects a plug from a slot.
It may be called in the following ways:

$ snap disconnect <snap>:<plug> <snap>:<slot>

Disconnects the specific plug from the specific slot.

$ snap disconnect <snap>:<slot or plug>

Disconnects everything from the provided plug or slot.
The snap name may be omitted for the core snap.

When an automatic connection is manually disconnected, its disconnected state
is retained after a snap refresh. The --forget flag can be added to the
disconnect command to reset this behaviour, and consequently re-enable
an automatic reconnection after a snap refresh.

25.

The download command downloads the given snap and its supporting assertions
to the current directory with .snap and .assert file extensions, respectively.

26.

The enable command enables a snap that was previously disabled.

27.

The export-key command exports a public key assertion body that may be
imported by other systems.

28.

The fde-setup-request command is used inside the fde-setup hook. It will
return information about what operation for full-disk encryption is
requested and auxiliary data to complete this operation.

The fde-setup hook should do what is requested and then call
"snapctl fde-setup-result" and pass the result data to stdin.

Here is an example for how the fde-setup hook is called initially:
$ snapctl fde-setup-request
{"op":"features"}
$ echo '[]' | snapctl fde-setup-result

Alternatively the hook could reply with:
$ echo '{"error":"hardware-unsupported"}' | snapctl fde-setup-result

And then it is called again with a request to do the initial key setup:
$ snapctl fde-setup-request
{"op":"initial-setup", "key": "key-to-seal", "key-name":"key-for-ubuntu-data"}
$ echo "$sealed_key" | snapctl fde-setup-result

29.

The fde-setup-result command sets the result data for a fde-setup hook
reading it from stdin.

For example:
When the fde-setup hook is called with "op":"features:
$ echo "[]" | snapctl fde-setup-result

When the fde-setup hook is called with "op":"initial-setup":
$ echo "sealed-key" | snapctl fde-setup-result

30.

The file-access command returns information about a snap's file system access.

This command is used by the xdg-document-portal service to identify
files that do not need to be proxied to provide access within
confinement.

File paths are interpreted as host file system paths. The tool may
return false negatives (e.g. report that a file path is unreadable,
despite being readable under a different path). It also does not
check if file system permissions would render a file unreadable.