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Merge remote-tracking branch 'origin/master' into flakes

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Eelco Dolstra 2019-10-04 17:26:32 +02:00
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10
doc/manual/expressions/builtins.xml
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@ -1605,12 +1605,18 @@ stdenv.mkDerivation (rec {
<term><function>builtins.tryEval</function>
<replaceable>e</replaceable></term>
<listitem><para>Try to evaluate <replaceable>e</replaceable>.
<listitem><para>Try to shallowly evaluate <replaceable>e</replaceable>.
Return a set containing the attributes <literal>success</literal>
(<literal>true</literal> if <replaceable>e</replaceable> evaluated
successfully, <literal>false</literal> if an error was thrown) and
<literal>value</literal>, equalling <replaceable>e</replaceable>
if successful and <literal>false</literal> otherwise.
if successful and <literal>false</literal> otherwise. Note that this
doesn't evaluate <replaceable>e</replaceable> deeply, so
<literal>let e = { x = throw ""; }; in (builtins.tryEval e).success
</literal> will be <literal>true</literal>. Using <literal>builtins.deepSeq
</literal> one can get the expected result: <literal>let e = { x = throw "";
}; in (builtins.tryEval (builtins.deepSeq e e)).success</literal> will be
<literal>false</literal>.
</para></listitem>
</varlistentry>

11
doc/manual/packages/garbage-collection.xml
View file

@ -52,12 +52,13 @@ garbage collector as follows:
<screen>
$ nix-store --gc</screen>
The behaviour of the gargage collector is affected by the <literal>keep-
derivations</literal> (default: true) and <literal>keep-outputs</literal>
The behaviour of the gargage collector is affected by the
<literal>keep-derivations</literal> (default: true) and <literal>keep-outputs</literal>
(default: false) options in the Nix configuration file. The defaults will ensure
that all derivations that are not build-time dependencies of garbage collector roots
will be collected but that all output paths that are not runtime dependencies
will be collected. (This is usually what you want, but while you are developing
that all derivations that are build-time dependencies of garbage collector roots
will be kept and that all output paths that are runtime dependencies
will be kept as well. All other derivations or paths will be collected.
(This is usually what you want, but while you are developing
it may make sense to keep outputs to ensure that rebuild times are quick.)
If you are feeling uncertain, you can also first view what files would