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diff --git a/doc/builders/packages/xorg.section.md b/doc/builders/packages/xorg.section.md new file mode 100644 index 000000000000..be220a25404a --- /dev/null +++ b/doc/builders/packages/xorg.section.md @@ -0,0 +1,34 @@ +# X.org {#sec-xorg} + +The Nix expressions for the X.org packages reside in `pkgs/servers/x11/xorg/default.nix`. This file is automatically generated from lists of tarballs in an X.org release. As such it should not be modified directly; rather, you should modify the lists, the generator script or the file `pkgs/servers/x11/xorg/overrides.nix`, in which you can override or add to the derivations produced by the generator. + +## Katamari Tarballs + +X.org upstream releases used to include [katamari](https://en.wiktionary.org/wiki/%E3%81%8B%E3%81%9F%E3%81%BE%E3%82%8A) releases, which included a holistic recommended version for each tarball, up until 7.7. To create a list of tarballs in a katamari release: + +```ShellSession +export release="X11R7.7" +export url="mirror://xorg/$release/src/everything/" +cat $(PRINT_PATH=1 nix-prefetch-url $url | tail -n 1) \ + | perl -e 'while (<>) { if (/(href|HREF)="([^"]*.bz2)"/) { print "$ENV{'url'}$2\n"; }; }' \ + | sort > "tarballs-$release.list" +``` + +## Individual Tarballs + +The upstream release process for [X11R7.8](https://x.org/wiki/Releases/7.8/) does not include a planned katamari. Instead, each component of X.org is released as its own tarball. We maintain `pkgs/servers/x11/xorg/tarballs.list` as a list of tarballs for each individual package. This list includes X.org core libraries and protocol descriptions, extra newer X11 interface libraries, like `xorg.libxcb`, and classic utilities which are largely unused but still available if needed, like `xorg.imake`. + +## Generating Nix Expressions + +The generator is invoked as follows: + +```ShellSession +cd pkgs/servers/x11/xorg +<tarballs.list perl ./generate-expr-from-tarballs.pl +``` + +For each of the tarballs in the `.list` files, the script downloads it, unpacks it, and searches its `configure.ac` and `*.pc.in` files for dependencies. This information is used to generate `default.nix`. The generator caches downloaded tarballs between runs. Pay close attention to the `NOT FOUND: $NAME` messages at the end of the run, since they may indicate missing dependencies. (Some might be optional dependencies, however.) + +## Overriding the Generator + +If the expression for a package requires derivation attributes that the generator cannot figure out automatically (say, `patches` or a `postInstall` hook), you should modify `pkgs/servers/x11/xorg/overrides.nix`. |