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doc: Clarify some of guix-daemon's GC options.

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Reported by Pierre Neidhardt <ambrevar@gmail.com>.

* doc/guix.texi (Invoking guix-daemon): Fix an incorrect statement
regarding --gc-keep-outputs.  Add a little to the description of this
option and --gc-keep-derivations.
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Chris Marusich 2018-07-28 02:50:06 -07:00
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doc/guix.texi
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@ -1375,8 +1375,8 @@ derivations.
@cindex garbage collector roots
When set to ``yes'', the GC will keep the outputs of any live derivation
available in the store---the @code{.drv} files. The default is ``no'',
meaning that derivation outputs are kept only if they are GC roots.
@xref{Invoking guix gc}, for more on GC roots.
meaning that derivation outputs are kept only if they are reachable from a GC
root. @xref{Invoking guix gc}, for more on GC roots.
@item --gc-keep-derivations[=yes|no]
Tell whether the garbage collector (GC) must keep derivations
@ -1387,12 +1387,13 @@ derivations---i.e., @code{.drv} files---as long as at least one of their
outputs is live. This allows users to keep track of the origins of
items in their store. Setting it to ``no'' saves a bit of disk space.
Note that when both @code{--gc-keep-derivations} and
@code{--gc-keep-outputs} are used, the effect is to keep all the build
prerequisites (the sources, compiler, libraries, and other build-time
tools) of live objects in the store, regardless of whether these
prerequisites are live. This is convenient for developers since it
saves rebuilds or downloads.
In this way, setting @code{--gc-keep-derivations} to ``yes'' causes liveness
to flow from outputs to derivations, and setting @code{--gc-keep-outputs} to
``yes'' causes liveness to flow from derivations to outputs. When both are
set to ``yes'', the effect is to keep all the build prerequisites (the
sources, compiler, libraries, and other build-time tools) of live objects in
the store, regardless of whether these prerequisites are reachable from a GC
root. This is convenient for developers since it saves rebuilds or downloads.
@item --impersonate-linux-2.6
On Linux-based systems, impersonate Linux 2.6. This means that the