* Documented common environment variables.
This commit is contained in:
Eelco Dolstra
parent
f982df3cd7
commit
ad3121a52d
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@ -18,7 +18,7 @@ MANUAL_SRCS = manual.xml introduction.xml installation.xml \
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build-farm.xml \
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$(man1_MANS:.1=.xml) \
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troubleshooting.xml bugs.xml opt-common.xml opt-common-syn.xml \
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quick-start.xml nix-lang-ref.xml style.css images
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env-common.xml quick-start.xml nix-lang-ref.xml style.css images
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manual.is-valid: $(MANUAL_SRCS) version.txt
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$(XMLLINT) --xinclude $< | $(XMLLINT) --noout --valid -
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@ -0,0 +1,112 @@
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<sect1 id="sec-common-env"><title>Common environment variables</title>
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<para>Most Nix commands interpret the following environment variables:</para>
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<variablelist>
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<varlistentry><term><envar>NIX_ROOT</envar></term>
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<listitem><para>If <envar>NIX_ROOT</envar> is set, the Nix command
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will on startup perform a <function>chroot()</function> to the
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specified directory. This is useful in certain bootstrapping
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situations (e.g., when installing a Nix installation onto a hard
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disk from CD-ROM).</para></listitem>
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</varlistentry>
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<varlistentry><term><envar>NIX_IGNORE_SYMLINK_STORE</envar></term>
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<listitem>
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<para>Normally, the Nix store directory (typically
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<filename>/nix/store</filename>) is not allowed to contain any
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symlink components. This is to prevent “impure” builds. Builders
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sometimes “canonicalise” paths by resolving all symlink components.
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Thus, builds on different machines (with
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<filename>/nix/store</filename> resolving to different locations)
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could yield different results. This is generally not a problem,
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except when builds are deployed to machines where
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<filename>/nix/store</filename> resolves differently. If you are
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sure that you’re not going to do that, you can set
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<envar>NIX_IGNORE_SYMLINK_STORE</envar> to <envar>1</envar>.</para>
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<para>Note that if you’re symlinking the Nix store so that you can
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put it on another file system than the root file system, on Linux
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you’re better off using <literal>bind</literal> mount points, e.g.,
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<screen>
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$ mkdir /nix
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$ mount -o bind /mnt/otherdisk/nix /nix</screen>
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Consult the <citerefentry><refentrytitle>mount</refentrytitle>
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<manvolnum>8</manvolnum></citerefentry> manual page for details.</para>
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</listitem>
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</varlistentry>
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<varlistentry><term><envar>NIX_STORE_DIR</envar></term>
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<listitem><para>Overrides the location of the Nix store (default
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<filename><replaceable>prefix</replaceable>/store</filename>).</para></listitem>
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</varlistentry>
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<varlistentry><term><envar>NIX_DATA_DIR</envar></term>
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<listitem><para>Overrides the location of the Nix static data
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directory (default
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<filename><replaceable>prefix</replaceable>/share</filename>).</para></listitem>
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</varlistentry>
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<varlistentry><term><envar>NIX_LOG_DIR</envar></term>
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<listitem><para>Overrides the location of the Nix log directory
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(default <filename><replaceable>prefix</replaceable>/log/nix</filename>).</para></listitem>
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</varlistentry>
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<varlistentry><term><envar>NIX_STATE_DIR</envar></term>
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<listitem><para>Overrides the location of the Nix state directory
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(default <filename><replaceable>prefix</replaceable>/var/nix</filename>).</para></listitem>
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</varlistentry>
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<varlistentry><term><envar>NIX_DB_DIR</envar></term>
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<listitem><para>Overrides the location of the Nix database (default
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<filename><replaceable>$NIX_STATE_DIR</replaceable>/db</filename>, i.e.,
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<filename><replaceable>prefix</replaceable>/var/nix/db</filename>).</para></listitem>
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</varlistentry>
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<varlistentry><term><envar>NIX_CONF_DIR</envar></term>
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<listitem><para>Overrides the location of the Nix configuration
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directory (default
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<filename><replaceable>prefix</replaceable>/etc/nix</filename>).</para></listitem>
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</varlistentry>
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<varlistentry><term><envar>NIX_LOG_TYPE</envar></term>
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<listitem><para>Equivalent to the <link
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linkend="opt-log-type"><option>--log-type</option>
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option</link>.</para></listitem>
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</varlistentry>
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</variablelist>
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</sect1>
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@ -33,6 +33,8 @@
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<appendix>
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<title>Command Reference</title>
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="opt-common.xml" />
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="env-common.xml" />
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<sect1>
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<title>nix-env</title>
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="nix-env.xml" />
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@ -74,13 +74,12 @@
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<para>
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This section lists the options that are common to all
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operations. These options are allowed for every subcommand,
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though they may not always have an effect.
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though they may not always have an effect. See also <xref
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linkend="sec-common-options" />.
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</para>
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<variablelist>
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="opt-common.xml#xpointer(/nop/*)" />
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<varlistentry>
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<term><option>--file</option> / <option>-f</option></term>
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<listitem>
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@ -31,7 +31,8 @@
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<para>
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This command is generally used for testing Nix expression before
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they are used with <command>nix-env</command>.
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they are used with <command>nix-env</command>. See also <xref
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linkend="sec-common-options" />.
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</para>
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</refsection>
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@ -41,8 +42,6 @@
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<variablelist>
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="opt-common.xml#xpointer(/nop/*)" />
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<varlistentry>
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<term><option>--parse-only</option></term>
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<listitem>
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@ -41,15 +41,10 @@
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<para>
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This section lists the options that are common to all
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operations. These options are allowed for every subcommand,
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though they may not always have an effect.
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though they may not always have an effect. See also <xref
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linkend="sec-common-options" />.
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</para>
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<variablelist>
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="opt-common.xml#xpointer(/nop/*)" />
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</variablelist>
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</refsection>
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@ -1,188 +1,209 @@
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<nop>
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<sect1 id="sec-common-options"><title>Common options</title>
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<para>Most Nix commands accept the following command-line options:</para>
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<variablelist>
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<varlistentry><term><option>--help</option></term>
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<listitem><para>Prints out a summary of the command syntax and
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exits.</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--version</option></term>
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<listitem><para>Prints out the Nix version number on standard output
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and exits.</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--verbose</option> / <option>-v</option></term>
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<varlistentry>
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<term><option>--help</option></term>
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<listitem>
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<para>
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Prints out a summary of the command syntax and exits.
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<para>Increases the level of verbosity of diagnostic messages
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printed on standard error. For each Nix operation, the information
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printed on standard output is well-defined; any diagnostic
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information is printed on standard error, never on standard
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output.</para>
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<para>This option may be specified repeatedly. Currently, the
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following verbosity levels exist:</para>
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<variablelist>
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<varlistentry><term>0</term>
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<listitem><para><quote>Errors only</quote>: only print messages
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explaining why the Nix invocation failed.</para></listitem>
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</varlistentry>
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<varlistentry><term>1</term>
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<listitem><para><quote>Informational</quote>: print
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<emphasis>useful</emphasis> messages about what Nix is doing.
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This is the default.</para></listitem>
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</varlistentry>
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<varlistentry><term>2</term>
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<listitem><para><quote>Talkative</quote>: print more informational
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messages.</para></listitem>
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</varlistentry>
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<varlistentry><term>3</term>
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<listitem><para><quote>Chatty</quote>: print even more
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informational messages.</para></listitem>
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</varlistentry>
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<varlistentry><term>4</term>
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<listitem><para><quote>Debug</quote>: print debug
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information.</para></listitem>
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</varlistentry>
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<varlistentry><term>5</term>
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<listitem><para><quote>Vomit</quote>: print vast amounts of debug
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information.</para></listitem>
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</varlistentry>
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</variablelist>
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</listitem>
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</varlistentry>
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<varlistentry><term><option>--no-build-output</option> / <option>-Q</option></term>
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<listitem><para>By default, output written by builders to standard
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output and standard error is echoed to the Nix command's standard
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error. This option suppresses this behaviour. Note that the
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builder's standard output and error are always written to a log file
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in
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<filename><replaceable>prefix</replaceable>/nix/var/log/nix</filename>.</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--max-jobs</option> / <option>-j</option></term>
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<listitem><para>Sets the maximum number of build jobs that Nix will
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perform in parallel to the specified number. The default is 1. A
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higher value is useful on SMP systems or to exploit I/O latency.</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--keep-going</option> / <option>-k</option></term>
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<listitem><para>Keep going in case of failed builds, to the
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greatest extent possible. That is, if building an input of some
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derivation fails, Nix will still build the other inputs, but not the
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derivation itself. Without this option, Nix stops if any build
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fails (except for builds of substitutes), possibly killing builds in
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progress (in case of parallel or distributed builds).</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--keep-failed</option> / <option>-K</option></term>
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<listitem><para>Specifies that in case of a build failure, the
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temporary directory (usually in <filename>/tmp</filename>) in which
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the build takes place should not be deleted. The path of the build
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directory is printed as an informational message.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--version</option></term>
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<varlistentry><term><option>--fallback</option></term>
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<listitem>
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<para>
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Prints out the Nix version number on standard output and exits.
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</para>
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<para>Whenever Nix attempts to realise a derivation for which a
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closure is already known, but this closure cannot be realised, fall
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back on normalising the derivation.</para>
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<para>The most common scenario in which this is useful is when we
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have registered substitutes in order to perform binary distribution
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from, say, a network repository. If the repository is down, the
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realisation of the derivation will fail. When this option is
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specified, Nix will build the derivation instead. Thus, binary
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installation falls back on a source installation. This option is
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not the default since it is generally not desirable for a transient
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failure in obtaining the substitutes to lead to a full build from
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source (with the related consumption of resources).</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--verbose</option> / <option>-v</option></term>
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<listitem>
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<para>
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Increases the level of verbosity of diagnostic messages printed
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on standard error. For each Nix operation, the information
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printed on standard output is well-defined; any diagnostic
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information is printed on standard error, never on standard
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output.
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</para>
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<varlistentry><term><option>--readonly-mode</option></term>
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<para>
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This option may be specified repeatedly. Currently, the
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following verbosity levels exist:
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</para>
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<variablelist>
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<varlistentry>
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<term>0</term>
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<listitem>
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<para>
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<quote>Errors only</quote>: only print messages explaining
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why the Nix invocation failed.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>1</term>
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<listitem>
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<para>
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<quote>Informational</quote>: print
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<emphasis>useful</emphasis> messages about what Nix is
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doing. This is the default.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>2</term>
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<listitem>
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<para>
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<quote>Talkative</quote>: print more informational messages.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>3</term>
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<listitem>
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<para>
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<quote>Chatty</quote>: print even more informational messages.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>4</term>
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<listitem>
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<para>
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<quote>Debug</quote>: print debug information:
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>5</term>
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<listitem>
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<para>
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<quote>Vomit</quote>: print vast amounts of debug
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information.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</listitem>
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<listitem><para>When this option is used, no attempt is made to open
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the Nix database. Most Nix operations do need database access, so
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those operations will fail.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--no-build-output</option> / <option>-Q</option></term>
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<varlistentry id="opt-log-type"><term><option>--log-type</option>
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<replaceable>type</replaceable></term>
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<listitem>
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<para>
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By default, output written by builders to standard output and
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standard error is echoed to the Nix command's standard error.
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This option suppresses this behaviour. Note that the builder's
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standard output and error are always written to a log file in
|
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<filename><replaceable>prefix</replaceable>/nix/var/log/nix</filename>.
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</para>
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<para>This option determines how the output written to standard
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error is formatted. Nix’s diagnostic messages are typically
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<emphasis>nested</emphasis>. For instance, when tracing Nix
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expression evaluation (<command>nix-env -vvvvv</command>, messages
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from subexpressions are nested inside their parent expressions. Nix
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builder output is also often nested. For instance, the Nix Packages
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generic builder nests the various build tasks (unpack, configure,
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compile, etc.), and the GNU Make in <literal>stdenv-linux</literal>
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has been patched to provide nesting for recursive Make
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invocations.</para>
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<para><replaceable>type</replaceable> can be one of the
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following:
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<variablelist>
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<varlistentry><term><literal>pretty</literal></term>
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<listitem><para>Pretty-print the output, indicating different
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nesting levels using spaces. This is the
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default.</para></listitem>
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</varlistentry>
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<varlistentry><term><literal>escapes</literal></term>
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<listitem><para>Indicate nesting using escape codes that can be
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interpreted by the <command>log2xml</command> tool in the Nix
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source distribution. The resulting XML file can be fed into the
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<command>log2html.xsl</command> stylesheet to create an HTML
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file that can be browsed interactively, using Javascript to
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expand and collapse parts of the output.</para></listitem>
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</varlistentry>
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<varlistentry><term><literal>flat</literal></term>
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<listitem><para>Remove all nesting.</para></listitem>
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</varlistentry>
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</variablelist>
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--max-jobs</option> / <option>-j</option></term>
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<listitem>
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<para>
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||||
Sets the maximum number of build jobs that Nix will perform in
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parallel to the specified number. The default is 1. A higher
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||||
value is useful on SMP systems or to exploit I/O latency.
|
||||
</para>
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||||
</listitem>
|
||||
</varlistentry>
|
||||
</variablelist>
|
||||
|
||||
|
||||
<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>
|
||||
|
||||
|
||||
<varlistentry>
|
||||
<term><option>--readonly-mode</option></term>
|
||||
<listitem>
|
||||
<para>
|
||||
When this option is used, no attempt is made to open the Nix
|
||||
database. Most Nix operations do need database access, so those
|
||||
operations will fail.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
</nop>
|
||||
</sect1>
|
||||
|
|
@ -229,4 +229,9 @@ div.epigraph
|
|||
table.productionset table.productionset
|
||||
{
|
||||
font-family: monospace;
|
||||
}
|
||||
}
|
||||
|
||||
a[href] {
|
||||
text-decoration: none;
|
||||
border-bottom: 1px dotted #005aa0;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue