You can then investigate which files your snap has access to by running commands such as ls and cat. This will create the confined environment of the Snap, execute the command-chain and then run bash inside that environment. To run a command as administrator (user "root"), use "sudo ". argument of snap run: $ snap run -shell mysnap.mycommand After the snap is installed, use the -shell. To investigate and test the confined environment of a snap, you can open a bash shell in it. When a snap is installed with developer mode, violations against a snap’s security policy are permitted to proceed but logged via journald. To install a snap in developer mode, use the -devmode argument: $ sudo snap install -devmode mysnap To help isolate runtime errors when building and testing a snap, a snap can be installed using developer mode. See Using gdb and gsbserver for more details.įor details on how AppArmor, Seccomp and device permission security policies are implemented, see Security policy and sandboxing. In addition to the above, GDB can also be used from within a snap’s environment to help isolate and identify potential issues. File permissions, along with cgroup device access, can inadvertently limit a snap’s functionality.snappy-debug, a snap developed for debugging and policy introspection.snap-seccomp and re-exec, resolving seccomp version mismatches under re-execution.Debug logs, track, monitor and check for policy violations.Developer mode, allows policy violations to proceed to help isolate runtime errors. Use snap run -shell to inpect and test the confined environment.Use snap try to install a snap from its unpacked and modifiable directory of components.When debugging or tracking potential issues with snaps running within a confined environment, the following approaches, techniques and insights can help resolve issues quickly:
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