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doc: Document references. 

Suggested by "pelzflorian (Florian Pelz)" <pelzflorian@pelzflorian.de>.
Fixes <https://bugs.gnu.org/34574>.

* doc/guix.texi (Derivations): Document references.
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Ludovic Courtès 2019-03-08 11:47:00 +01:00
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@ -6238,8 +6238,11 @@ The outputs of the derivation---derivations produce at least one file or
directory in the store, but may produce more.
@item
The inputs of the derivations, which may be other derivations or plain
files in the store (patches, build scripts, etc.)
@cindex build-time dependencies
@cindex dependencies, build-time
The inputs of the derivations---i.e., its build-time dependencies---which may
be other derivations or plain files in the store (patches, build scripts,
etc.)
@item
The system type targeted by the derivation---e.g., @code{x86_64-linux}.
@ -6270,6 +6273,16 @@ 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.
@cindex references
@cindex run-time dependencies
@cindex dependencies, run-time
The outputs of derivations---i.e., the build results---have a set of
@dfn{references}, as reported by the @code{references} RPC or the
@command{guix gc --references} command (@pxref{Invoking guix gc}). References
are the set of run-time dependencies of the build results. References are a
subset of the inputs of the derivation; this subset is automatically computed
by the build daemon by scanning all the files in the outputs.
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