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nixpkgs/doc/glibc: better glibc link

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also replace unicode symbol in case some environment cannot reproduce the
encoding or font symbol.
This commit is contained in:
Jörg Thalheim 2021-09-22 20:28:58 +02:00
parent 2505488672
commit e6c02cc4b4
1 changed files with 3 additions and 2 deletions
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5
doc/builders/packages/etc-files.section.md
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@ -6,12 +6,13 @@ On non-NixOS distributions these files are typically provided by packages (i.e.
If [iana-etc](https://hydra.nixos.org/job/nixos/trunk-combined/nixpkgs.iana-etc.x86_64-linux) is part of your _buildInputs_ then it will set the environment varaibles `NIX_ETC_PROTOCOLS` and `NIX_ETC_SERVICES` to the corresponding files in the package through a _setup-hook_.
```bash
❯ nix-shell -p iana-etc
> nix-shell -p iana-etc
[nix-shell:~]$ env | grep NIX_ETC
NIX_ETC_SERVICES=/nix/store/aj866hr8fad8flnggwdhrldm0g799ccz-iana-etc-20210225/etc/services
NIX_ETC_PROTOCOLS=/nix/store/aj866hr8fad8flnggwdhrldm0g799ccz-iana-etc-20210225/etc/protocols
```
Nixpkg's version of [glibc](https://hydra.nixos.org/job/nixos/trunk-combined/nixpkgs.glibc.x86_64-linux) has been patched to check for the existence of these environment variables. If the environment variable are *not set*, then it will attempt to find the files at the default location within _/etc_.
Nixpkg's version of [glibc](https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/libraries/glibc/default.nix) has been patched to check for the existence of these environment variables. If the environment variable are *not set*, then it will attempt to find the files at the default location within _/etc_.