guix/corepkgs/buildenv.nix

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with import <nix/config.nix>;
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{ derivations, manifest }:
derivation {
name = "user-environment";
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system = builtins.currentSystem;
builder = perl;
args = [ "-w" ./buildenv.pl ];
manifest = manifest;
# !!! grmbl, need structured data for passing this in a clean way.
paths = derivations;
active = map (x: if x ? meta && x.meta ? active then x.meta.active else "true") derivations;
priority = map (x: if x ? meta && x.meta ? priority then x.meta.priority else "5") derivations;
# Building user environments remotely just causes huge amounts of
# network traffic, so don't do that.
preferLocalBuild = true;
# Don't build in a chroot because Nix's dependencies may not be there.
__noChroot = true;
}