20893b3a70
For a lot of the work the non-interactive drivers are enough and it is probably a good idea to keep it accessible for debugging without touching the Nix expression.
50 lines
1.7 KiB
XML
50 lines
1.7 KiB
XML
<section xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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version="5.0"
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xml:id="sec-running-nixos-tests-interactively">
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<title>Running Tests interactively</title>
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<para>
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The test itself can be run interactively. This is particularly useful when
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developing or debugging a test:
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<screen>
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<prompt>$ </prompt>nix-build nixos/tests/login.nix -A driverInteractive
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<prompt>$ </prompt>./result/bin/nixos-test-driver
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starting VDE switch for network 1
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<prompt>></prompt>
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</screen>
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You can then take any Python statement, e.g.
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<screen>
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<prompt>></prompt> start_all()
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<prompt>></prompt> test_script()
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<prompt>></prompt> machine.succeed("touch /tmp/foo")
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<prompt>></prompt> print(machine.succeed("pwd")) # Show stdout of command
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</screen>
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The function <command>test_script</command> executes the entire test script
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and drops you back into the test driver command line upon its completion.
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This allows you to inspect the state of the VMs after the test (e.g. to debug
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the test script).
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</para>
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<para>
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To just start and experiment with the VMs, run:
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<screen>
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<prompt>$ </prompt>nix-build nixos/tests/login.nix -A driverInteractive
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<prompt>$ </prompt>./result/bin/nixos-run-vms
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</screen>
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The script <command>nixos-run-vms</command> starts the virtual machines
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defined by test.
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</para>
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<para>
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You can re-use the VM states coming from a previous run
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by setting the <command>--keep-vm-state</command> flag.
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<screen>
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<prompt>$ </prompt>./result/bin/nixos-run-vms --keep-vm-state
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</screen>
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The machine state is stored in the
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<filename>$TMPDIR/vm-state-</filename><varname>machinename</varname> directory.
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</para>
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</section>
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