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authorLudovic Courtès <ludo@gnu.org>2017-12-21 22:12:00 +0100
committerLudovic Courtès <ludo@gnu.org>2017-12-22 08:56:50 +0100
commit8785bd7759df7ba9c199dcdf398edd922866e3df (patch)
treedbecc7d2da8e93b5dfdb5bd2d92bb0f9bff2f8cd /doc/guix.texi
parenta468f897437acfc1c70987a6df252c4735e3bf2d (diff)
doc: Document fixed-output derivations.
* doc/guix.texi (Derivations): Add paragraph on fixed-output derivations.
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@@ -4210,6 +4210,14 @@ paths}. Derivations paths can be passed to the @code{build-derivations}
procedure to perform the build actions they prescribe (@pxref{The
Store}).
+@cindex fixed-output derivations
+Operations such as file downloads and version-control checkouts for
+which the expected content hash is known in advance are modeled as
+@dfn{fixed-output derivations}. Unlike regular derivations, the outputs
+of a fixed-output derivation are independent of its inputs---e.g., a
+source code download produces the same result regardless of the download
+method and tools being used.
+
The @code{(guix derivations)} module provides a representation of
derivations as Scheme objects, along with procedures to create and
otherwise manipulate derivations. The lowest-level primitive to create