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* Document --arg.

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This commit is contained in:
Eelco Dolstra 2006-10-05 09:08:52 +00:00
parent 6f2bfd92b6
commit 5d769de8a3
6 changed files with 53 additions and 15 deletions
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8
doc/manual/nix-build.xml
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@ -9,6 +9,8 @@
<refsynopsisdiv>
<cmdsynopsis>
<command>nix-build</command>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="opt-common-syn.xml#xpointer(/nop/*)" />
<arg><option>--arg</option> <replaceable>name</replaceable> <replaceable>value</replaceable></arg>
<arg><option>--add-drv-link</option></arg>
<arg><option>--drv-link </option><replaceable>drvlink</replaceable></arg>
<arg><option>--no-out-link</option></arg>
@ -56,6 +58,12 @@ or renamed. So don’t rename the symlink.</para></warning>
<refsection><title>Options</title>
<para>See also <xref linkend="sec-common-options" />. All options not
listed here are passed to <command>nix-store --realise</command>,
except for <option>--arg</option> and <option>--attr</option> /
<option>-A</option> which are passed to
<command>nix-instantiate</command>.</para>
<variablelist>
<varlistentry><term><option>--add-drv-link</option></term>

15
doc/manual/nix-env.xml
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@ -10,6 +10,7 @@
<cmdsynopsis>
<command>nix-env</command>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="opt-common-syn.xml#xpointer(/nop/*)" />
<arg><option>--arg</option> <replaceable>name</replaceable> <replaceable>value</replaceable></arg>
<arg>
<group choice='req'>
<arg choice='plain'><option>--file</option></arg>
@ -24,7 +25,6 @@
</group>
<replaceable>path</replaceable>
</arg>
<arg><option>--preserve-installed</option></arg>
<arg>
<arg choice='plain'><option>--system-filter</option></arg>
<replaceable>system</replaceable>
@ -106,19 +106,6 @@ linkend="sec-common-options" />.</para>
</varlistentry>
<varlistentry><term><option>--preserve-installed</option></term>
<listitem><para>By default, when you install a derivation with the
<option>--install</option> operation, it will replace previously
installed versions with the same derivation name (regardless of
the version number). This option causes those previously
installed versions to be kept in the new generation of the
profile. Note that this will generally cause conflicts in the
creation of the user environment (since multiple versions of a
package typically contain the same programs).</para></listitem>
</varlistentry>
<varlistentry><term><option>--system-filter</option> <replaceable>system</replaceable></term>
<listitem><para>By default, operations such as <option>--query

1
doc/manual/nix-instantiate.xml
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@ -10,6 +10,7 @@
<cmdsynopsis>
<command>nix-instantiate</command>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="opt-common-syn.xml#xpointer(/nop/*)" />
<arg><option>--arg</option> <replaceable>name</replaceable> <replaceable>value</replaceable></arg>
<arg><option>--add-root</option> <replaceable>path</replaceable></arg>
<arg><option>--indirect</option></arg>
<group choice='opt'>

1
doc/manual/opt-common-syn.xml
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@ -20,5 +20,6 @@
<arg><option>--fallback</option></arg>
<arg><option>--readonly-mode</option></arg>
<arg><option>--log-type</option> <replaceable>type</replaceable></arg>
<sbr />
</nop>

40
doc/manual/opt-common.xml
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@ -217,6 +217,46 @@
</varlistentry>
<varlistentry><term><option>--arg</option> <replaceable>name</replaceable> <replaceable>value</replaceable></term>
<listitem><para>This option is accepted by
<command>nix-env</command>, <command>nix-instantiate</command> and
<command>nix-build</command>. When evaluating Nix expressions, the
expression evaluator will automatically try to call functions that
it encounters. It can automatically call functions for which every
argument has a default value (e.g.,
<literal>{<replaceable>argName</replaceable> ?
<replaceable>defaultValue</replaceable>}:
<replaceable>...</replaceable></literal>). With
<option>--arg</option>, you can also call functions that have
arguments without a default value (or override a default value).
That is, if the evaluator encounters a function with an argument
named <replaceable>name</replaceable>, it will call it with value
<replaceable>value</replaceable>.</para>
<para>For instance, the file
<literal>pkgs/top-level/all-packages.nix</literal> in Nixpkgs is
actually a function:
<programlisting>
{ # The system (e.g., `i686-linux') for which to build the packages.
system ? __currentSystem
<replaceable>...</replaceable>
}: <replaceable>...</replaceable></programlisting>
So if you call this Nix expression (e.g., when you do
<literal>nix-env -i <replaceable>pkgname</replaceable></literal>),
the function will be called automatically using the value <link
linkend='builtin-currentSystem'><literal>__currentSystem</literal></link>
for the <literal>system</literal> argument. You can override this
using <option>--arg</option>, e.g., <literal>nix-env -i
<replaceable>pkgname</replaceable> --arg system
\"i686-freebsd\"</literal>. (Note that since the argument is a Nix
string literal, you have to escape the quotes.)</para></listitem>
</varlistentry>
</variablelist>

3
doc/manual/writing-nix-expressions.xml
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@ -1387,7 +1387,8 @@ if builtins ? getEnv then __getEnv "PATH" else ""</programlisting>
</varlistentry>
<varlistentry><term><varname>currentSystem</varname></term>
<varlistentry
xml:id='builtin-currentSystem'><term><varname>builtins.currentSystem</varname></term>
<listitem><para>The built-in value <varname>currentSystem</varname>
evaluates to the Nix platform identifier for the Nix installation