docs: describe $IN_NIX_SHELL values #2796
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See commit 1bffd83
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| <varlistentry><term><envar>IN_NIX_SHELL</envar></term> | |||
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| <listitem><para>Indicator that tells if the current environment was set up by | |||
| <command>nix-shell</command>.</para></listitem> | |||
| <command>nix-shell</command>. Since Nix 2.0 the values are | |||
| <literal>"pure"</literal> and <literal>"impure"</literal></para></listitem> | |||
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(nit) I think the quotes belong outside of the <literal> tags, as the value does not contain the ".
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I originally had it without the quotes, but man pages render these as regular words... and that didn't seem sufficient to me.
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There is an issue with IN_NIX_SHELL that should be documented. Basically if you are in a nix-shell and call nix-build, it will still think you are in the nix-shell: This effects haskell a lot. |
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That function is a misuse of |
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Regardless of being a misuse (or not), is there any argument against fixing that behavior? (i.e. make nix remove this variable from its env, at least for spawned builders) Some fix of this should be trivial IMO. |
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Hmm, indeed. I thought that wouldn't be possible without changing the semantics, but it looks like that would work. EDIT #2797 |
I plan to merge this in a few days if noone reacts (assuming I'll still have the permissions :). Perhaps backport to
2.*-maintenancebranches, too.