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nixos/testing: disallow special chars in machine names in network expressions

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These names are referenced by Perl variables inside the testing
frameworks which don't allow chars like `-` as character inside. An exemplary
expression may look like this:

```
{
  x11-vm = {
    services.xserver.enable = true;
  };
}
```

This expression evaluates, e.g. when running `nixos-build-vms`, but when
trying to run `./result/bin/nixos-run-vms`, an error like this occurs:

```
starting VDE switch for network 1
running the VM test script
error: Can't modify subtraction (-) in scalar assignment at (eval 17) line 1, at EOF
Bareword "test" not allowed while "strict subs" in use at (eval 17) line 1.
Can't modify subtraction (-) in scalar assignment at (eval 17) line 1, at EOF
Bareword "test" not allowed while "strict subs" in use at (eval 17) line 1.
vde_switch: EOF on stdin, cleaning up and exiting
cleaning up
```

This can be very confusing for beginners, this change breaks evaluation
if such names are used for machines.
This commit is contained in:
Maximilian Bosch 2018-09-17 23:08:43 +02:00
parent bc1911e96e
commit 113a6b9325
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GPG key ID: 091DBF4D1FC46B8E
1 changed files with 17 additions and 3 deletions
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20
nixos/lib/testing.nix
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@ -149,9 +149,23 @@ in rec {
test = passMeta (runTests driver);
report = passMeta (releaseTools.gcovReport { coverageRuns = [ test ]; });
in (if makeCoverageReport then report else test) // {
inherit nodes driver test;
};
nodeNames = builtins.attrNames nodes;
invalidNodeNames = lib.filter
(node: builtins.match "^[A-z_][A-z0-9_]+$" node == null) nodeNames;
in
if lib.length invalidNodeNames > 0 then
throw ''
Cannot create machines out of (${lib.concatStringsSep ", " invalidNodeNames})!
All machines are references as perl variables in the testing framework which will break the
script when special characters are allowed.
Please stick to alphanumeric chars and underscores as separation.
''
else
(if makeCoverageReport then report else test) // {
inherit nodes driver test;
};
runInMachine =
{ drv