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Document nixpkgs upgrades (#977)

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Upgrading.md
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@ -31,4 +31,18 @@ This will take a while.
## Nixpkgs
TODO
To update the nixpkgs revision, go to the `nix/nixpkgs` directory in
this repository and run `nix-update-src-json ./nixos-*` to update to
the latest release in the current NixOS channel. To upgrade to a new
channel move `nixos-18.09` to `nixos-19.03` (adapt to the channels you
want to move from and to), change the `branch` field in
`default.src.json` and modify `nix/nixpkgs.nix` to point to the new
channel.
After upgrading the revision, the easiest solution is usually to open
a PR and see what fails on CI (running the builds locally can take
quite some time). The most common reason for failures is usually that
we have overriden a specific package with certain patches that no
longer work. In that case, a good first step is to check if these
patches are still necessary and if not try to switch to the unpatched
package from nixpkgs.