mirror of
https://github.com/NixOS/nix.git
synced 2024-11-26 16:52:27 +00:00
1eddee59f2
* Builder output is written to standard error by default. * The option `-B' is gone. * The option `-Q' suppresses builder output. The result of this is that most Nix invocations shouldn't need any flags w.r.t. logging.
174 lines
5.0 KiB
XML
174 lines
5.0 KiB
XML
<varlistentry>
|
|
<term><option>--help</option></term>
|
|
<listitem>
|
|
<para>
|
|
Prints out a summary of the command syntax and exits.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term><option>--version</option></term>
|
|
<listitem>
|
|
<para>
|
|
Prints out the Nix version number on standard output and exits.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term><option>--verbose</option> / <option>-v</option></term>
|
|
<listitem>
|
|
<para>
|
|
Increases the level of verbosity of diagnostic messages printed
|
|
on standard error. For each Nix operation, the information
|
|
printed on standard output is well-defined; any diagnostic
|
|
information is printed on standard error, never on standard
|
|
output.
|
|
</para>
|
|
|
|
<para>
|
|
This option may be specified repeatedly. Currently, the
|
|
following verbosity levels exist:
|
|
</para>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>0</term>
|
|
<listitem>
|
|
<para>
|
|
<quote>Errors only</quote>: only print messages explaining
|
|
why the Nix invocation failed.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>1</term>
|
|
<listitem>
|
|
<para>
|
|
<quote>Informational</quote>: print
|
|
<emphasis>useful</emphasis> messages about what Nix is
|
|
doing. This is the default.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>2</term>
|
|
<listitem>
|
|
<para>
|
|
<quote>Talkative</quote>: print more informational messages.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>3</term>
|
|
<listitem>
|
|
<para>
|
|
<quote>Chatty</quote>: print even more informational messages.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>4</term>
|
|
<listitem>
|
|
<para>
|
|
<quote>Debug</quote>: print debug information:
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>5</term>
|
|
<listitem>
|
|
<para>
|
|
<quote>Vomit</quote>: print vast amounts of debug
|
|
information.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term><option>--no-build-output</option> / <option>-Q</option></term>
|
|
<listitem>
|
|
<para>
|
|
By default, output written by builders to standard output and
|
|
standard error is echoed to the Nix command's standard error.
|
|
This option suppresses this behaviour. Note that the builder's
|
|
standard output and error are always written to a log file in
|
|
<filename><replaceable>prefix</replaceable>/nix/var/log/nix</filename>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term><option>--max-jobs</option> / <option>-j</option></term>
|
|
<listitem>
|
|
<para>
|
|
Sets the maximum number of build jobs that Nix will perform in
|
|
parallel to the specified number. The default is 1. A higher
|
|
value is useful on SMP systems or to exploit I/O latency.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term><option>--keep-going</option> / <option>-k</option></term>
|
|
<listitem>
|
|
<para>
|
|
Keep going in case of failed builds, to the greatest extent
|
|
possible. That is, if building an input of some derivation
|
|
fails, Nix will still build the other inputs, but not the
|
|
derivation itself. Without this option, Nix stops if any build
|
|
fails (except for builds of substitutes), possibly killing
|
|
builds in progress (in case of parallel or distributed builds).
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term><option>--keep-failed</option> / <option>-K</option></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies that in case of a build failure, the temporary
|
|
directory (usually in <filename>/tmp</filename>) in which the
|
|
build takes place should not be deleted. The path of the build
|
|
directory is printed as an informational message.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term><option>--fallback</option></term>
|
|
<listitem>
|
|
<para>
|
|
Whenever Nix attempts to realise a derivation for which a
|
|
closure is already known, but this closure cannot be realised,
|
|
fall back on normalising the derivation.
|
|
</para>
|
|
|
|
<para>
|
|
The most common scenario in which this is useful is when we have
|
|
registered substitutes in order to perform binary distribution
|
|
from, say, a network repository. If the repository is down, the
|
|
realisation of the derivation will fail. When this option is
|
|
specified, Nix will build the derivation instead. Thus,
|
|
binary installation falls back on a source installation. This
|
|
option is not the default since it is generally not desirable
|
|
for a transient failure in obtaining the substitutes to lead to
|
|
a full build from source (with the related consumption of
|
|
resources).
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|