Rebecca Turner
727b43478c
Adds a `repl-overlays` option, which specifies files that can overlay
and modify the top-level bindings in `nix repl`. For example, with the
following contents in `~/.config/nix/repl.nix`:
info: final: prev: let
optionalAttrs = predicate: attrs:
if predicate
then attrs
else {};
in
optionalAttrs (prev ? legacyPackages && prev.legacyPackages ? ${info.currentSystem})
{
pkgs = prev.legacyPackages.${info.currentSystem};
}
We can run `nix repl` and use `pkgs` to refer to `legacyPackages.${currentSystem}`:
$ nix repl --repl-overlays ~/.config/nix/repl.nix nixpkgs
Lix 2.90.0
Type :? for help.
Loading installable 'flake:nixpkgs#'...
Added 5 variables.
Loading 'repl-overlays'...
Added 6 variables.
nix-repl> pkgs.bash
«derivation /nix/store/g08b5vkwwh0j8ic9rkmd8mpj878rk62z-bash-5.2p26.drv»
Change-Id: Ic12e0f2f210b2f46e920c33088dfe1083f42391a
23 lines
889 B
Plaintext
23 lines
889 B
Plaintext
`repl-overlays` that fail to evaluate should error.
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@args --repl-overlays
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@args ${PWD}/extra_data/repl-overlay-fail.nix
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@should-start false
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error:
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… while calling the 'foldl'' builtin
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at «string»:5:13:
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4| functions:
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5| let final = builtins.foldl'
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| ^
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6| (prev: function: prev // (function info final prev))
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… in the right operand of the update (//) operator
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at «string»:6:37:
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5| let final = builtins.foldl'
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6| (prev: function: prev // (function info final prev))
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| ^
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7| initial
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(stack trace truncated; use '--show-trace' to show the full trace)
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error: evaluation aborted with the following error message: 'uh oh!'
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