Maximilian Bosch authored
The new script (scripts/nix-flame) is basically a wrapper for creating a flamegraph of a Nix evaluation (the steps are shown in `<nix/contrib/stack-collapse.py>`, but are pretty verbose). The script creates a flame-graph (and displays any evaluation errors in case of failures) in the SVG-format and optionally opens it using "$BROWSER" (this was the cheapest approach to open a SVG, if there's a better approach - feel free to open an issue or file a bug!). This helper relies on `contrib/stack-collapse.py` which is incorporated from NixOS/nix (unfortunately this is a contrib-script and not part of any store path derived from Nix, so we need to bundle it manually). To avoid license incompliance, a `3rdparty/*` tree was created which contains the script from Nix including its LICENSE and the notices about our license situation (MIT for the root, LGPL for the Nix-code) were updated to avoid any incompatibility. As this doesn't publish a modified version of NixOS/nix, but basically links to it (or more specifically a subset of it), referencing the COPYING file should be fine.