3d05166086
allow switching between them (NIX-80).
Example: two versions of Pan:
$ nix-env -q pan
pan-0.128
pan-0.14.2.91
$ readlink $(which pan)
/nix/store/l38jrbilw269drpjkx7kinhrxj6fjh59-pan-0.14.2.91/bin/pan
At most one of them can be active any given time. Assuming than
0.14.2.91 is active, you can active 0.128 as follows:
$ nix-env --set-flag active false pan-0.14.2.91
$ nix-env --set-flag active true pan-0.128
$ readlink $(which pan)
/nix/store/nziqwnlzy7xl385kglxhg75pfl5i936n-pan-0.128/bin/pan
More flags to follow.
12 lines
341 B
Nix
12 lines
341 B
Nix
{system, derivations, manifest}:
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derivation {
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name = "user-environment";
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system = system;
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builder = ./builder.pl;
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derivations = derivations;
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manifest = manifest;
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# !!! grmbl, need structured data for passing this in a clean way.
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active = map (x: if x ? meta && x.meta ? active then x.meta.active else "true") derivations;
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}
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