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Keeping the VM state test across several run sometimes lead to subtle and hard to spot errors in practice. We delete the VM state which contains (among other things) the qcow volume. We also introduce a -K (--keep-vm-state) flag making VM state to persist after the test run. This flag makes test-driver.py to match its previous behaviour.
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 driver
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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 driver
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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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