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Merge pull request #5365 from arafangion/master

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Clarify that not all nix packages will use the default build phases
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Domen Kožar 2021-10-17 20:54:00 -05:00 committed by GitHub
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12
doc/manual/src/command-ref/nix-shell.md
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@ -110,13 +110,19 @@ shell in which to build it:
```console ```console
$ nix-shell '<nixpkgs>' -A pan $ nix-shell '<nixpkgs>' -A pan
[nix-shell]$ unpackPhase [nix-shell]$ eval ${unpackPhase:-unpackPhase}
[nix-shell]$ cd pan-* [nix-shell]$ cd pan-*
[nix-shell]$ configurePhase [nix-shell]$ eval ${configurePhase:-configurePhase}
[nix-shell]$ buildPhase [nix-shell]$ eval ${buildPhase:-buildPhase}
[nix-shell]$ ./pan/gui/pan [nix-shell]$ ./pan/gui/pan
``` ```
The reason we use form `eval ${configurePhase:-configurePhase}` here is because
those packages that override these phases do so by exporting the overridden
values in the environment variable of the same name.
Here bash is being told to either evaluate the contents of 'configurePhase',
if it exists as a variable, otherwise evaluate the configurePhase function.
To clear the environment first, and do some additional automatic To clear the environment first, and do some additional automatic
initialisation of the interactive shell: initialisation of the interactive shell: