nixos/build-vms: propagate file location
When trying to build a VM using `nixos-build-vms` with a configuration that doesn't evaluate, an error "at `<unknown-file>`" is usually shown. This happens since the `build-vms.nix` creates a VM-network of NixOS-configurations that are attr-sets or functions and don't contain any file information. This patch manually adds the `_file`-attribute to tell the module-system which file contained broken configuration: ``` $ cat vm.nix { vm.invalid-option = 1; } $ nixos-build-vms vm.nix error: The option `invalid-option' defined in `/home/ma27/Projects/nixpkgs/vm.nix@node-vm' does not exist. (use '--show-trace' to show detailed location information) ```
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@ -3,7 +3,12 @@
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, networkExpr
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}:
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let nodes = import networkExpr; in
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let
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nodes = builtins.mapAttrs (vm: module: {
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_file = "${networkExpr}@node-${vm}";
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imports = [ module ];
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}) (import networkExpr);
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in
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with import ../../../../lib/testing-python.nix {
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inherit system;
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