Maximilian Bosch 3743c42f23 flake.nix: allow inclusion of nixpkgs as path:/.../ ...

When adding `nixpkgs` as flake-input using the `path`-fetcher, you
currently get the following error since neither `lastModifiedDate` nor
`lastModified` are stored in `flake.lock` for paths:

```
error: --- EvalError --------------------------------------------------------------------------- nix-build
at: (48:71) in file: /nix/store/147clg8svaxyj7pl80ra9kmmm72mdg94-source/flake.nix

    47|                   system.nixos.versionSuffix =
    48|                     ".${final.substring 0 8 (self.lastModifiedDate or self.lastModified)}.${self.shortRev or "dirty"}";
      |                                                                       ^
    49|                   system.nixos.revision = final.mkIf (self ? rev) self.rev;

attribute 'lastModified' missing
```

This patch adds the fallback-value `19700101` to `versionSuffix` if none
of `lastModified{,Date}` are set in the lockfile.

2020-10-13 12:05:19 +02:00

2.2 KiB

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