Looks like package versions are managed by nix-channel, and there seems no way to pin it for reproducibility on other machines.
I’m still new to nix/home-manager and don’t know how home.nix configuration works. Is there a way to pin package versions with niv, or does something else work?
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Yes, it is possible.
The idea is that you use niv to pin your inputs and then wrap running home-manager in a small script that loads a nix-shell first, that sets the NIX_PATH variable to the pinned versions.
An example of this can be seen in this repository by @ryantm:
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