427 lines
12 KiB
XML
427 lines
12 KiB
XML
<refentry>
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<refnamediv>
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<refname>nix</refname>
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<refpurpose>manipulate or query the Nix store</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>nix</command>
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<group choice='opt'>
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<arg><option>--path</option></arg>
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<arg><option>-p</option></arg>
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</group>
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<group choice='opt' rep='repeat'>
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<arg><option>--verbose</option></arg>
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<arg><option>-v</option></arg>
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</group>
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<arg choice='plain'><replaceable>operation</replaceable></arg>
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<arg rep='repeat'><replaceable>options</replaceable></arg>
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<arg rep='repeat'><replaceable>arguments</replaceable></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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The command <command>nix</command> provides access to the Nix store. This
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is the (set of) path(s) where Nix expressions and the file system objects
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built by them are stored.
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</para>
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<para>
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<command>nix</command> has many subcommands called
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<emphasis>operations</emphasis>. These are individually documented
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below. Exactly one operation must always be provided.
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</para>
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</refsect1>
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<refsect1>
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<title>Common Options</title>
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<para>
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In this section the options that are common to all Nix operations are
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listed. These options are allowed for every subcommand (although they
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may not always have an effect).
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</para>
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<variablelist>
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<varlistentry>
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<term><option>--path</option></term>
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<listitem>
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<para>
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Indicates that any identifier arguments to the operation are paths
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in the store rather than identifiers.
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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>--verbose</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 on
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standard error. For each Nix operation, the information printed on
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standard output is well-defined and specified below in the
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respective sections. Any diagnostic information is printed on
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standard error, never on standard output.
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</para>
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<para>
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This option may be specified repeatedly. Currently, the following
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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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Print error messages only.
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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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Print 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>2</term>
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<listitem>
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<para>
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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>3</term>
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<listitem>
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<para>
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Print messages that should only be useful for debugging.
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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>Vomit mode</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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</varlistentry>
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</variablelist>
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</refsect1>
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<!--######################################################################-->
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<refsect1>
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<title>Operation <option>--install</option></title>
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<refsect2>
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<title>Synopsis</title>
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<cmdsynopsis>
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<command>nix</command>
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<group>
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<arg><option>--install</option></arg>
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<arg><option>-i</option></arg>
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</group>
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<arg choice='plain' rep='repeat'><replaceable>ids</replaceable></arg>
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</cmdsynopsis>
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</refsect2>
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<refsect2>
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<title>Description</title>
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<para>
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The operation <option>--install</option> realises the Nix expressions
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identified by <replaceable>ids</replaceable> in the file system. If
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these expressions are derivation expressions, they are first
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normalised. That is, their target paths are are built, unless a normal
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form is already known.
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</para>
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<para>
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The identifiers of the normal forms of the given Nix expressions are
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printed on standard output.
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</para>
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</refsect2>
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</refsect1>
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<!--######################################################################-->
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<refsect1>
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<title>Operation <option>--delete</option></title>
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<refsect2>
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<title>Synopsis</title>
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<cmdsynopsis>
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<command>nix</command>
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<group>
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<arg><option>--delete</option></arg>
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<arg><option>-d</option></arg>
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</group>
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<arg choice='plain' rep='repeat'><replaceable>paths</replaceable></arg>
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</cmdsynopsis>
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</refsect2>
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<refsect2>
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<title>Description</title>
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<para>
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The operation <option>--delete</option> unconditionally deletes the
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paths <replaceable>paths</replaceable> from the Nix store. It is an
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error to attempt to delete paths outside of the store.
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</para>
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<warning>
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<para>
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This operation should almost never be called directly, since no
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attempt is made to verify that no references exist to the paths to
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be deleted. Therefore, careless deletion can result in an
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inconsistent system. Deletion of paths in the store is done by the
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garbage collector (which uses <option>--delete</option> to delete
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unreferenced paths).
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</para>
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</warning>
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</refsect2>
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</refsect1>
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<!--######################################################################-->
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<refsect1>
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<title>Operation <option>--query</option></title>
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<refsect2>
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<title>Synopsis</title>
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<cmdsynopsis>
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<command>nix</command>
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<group>
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<arg><option>--query</option></arg>
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<arg><option>-q</option></arg>
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</group>
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<group>
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<group>
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<arg><option>--list</option></arg>
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<arg><option>-l</option></arg>
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</group>
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<group>
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<arg><option>--requisites</option></arg>
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<arg><option>-r</option></arg>
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</group>
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<group>
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<arg><option>--expansion</option></arg>
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<arg><option>-e</option></arg>
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</group>
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<group>
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<arg><option>--graph</option></arg>
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<arg><option>-g</option></arg>
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</group>
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</group>
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<arg choice='plain' rep='repeat'><replaceable>args</replaceable></arg>
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</cmdsynopsis>
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</refsect2>
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<refsect2>
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<title>Description</title>
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<para>
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The operation <option>--query</option> displays various bits of
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information about Nix expressions or paths in the store. The queries
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are described in <xref linkend='nixref-queries' />. At most one query
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can be specified; the default query is <option>--list</option>.
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</para>
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</refsect2>
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<refsect2 id='nixref-queries'>
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<title>Queries</title>
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<variablelist>
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<varlistentry>
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<term><option>--list</option></term>
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<listitem>
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<para>
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Prints out the target paths of the Nix expressions indicated by
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the identifiers <replaceable>args</replaceable>. In the case of
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a derivation expression, these are the paths that will be
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produced by the builder of the expression. In the case of a
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slice expression, these are the root paths (which are generally
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the paths that were produced by the builder of the derivation
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expression of which the slice is a normal form).
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</para>
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<para>
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This query has one option:
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</para>
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<variablelist>
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<varlistentry>
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<term><option>--normalise</option></term>
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<listitem>
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<para>
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Causes the target paths of the <emphasis>normal
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forms</emphasis> of the expressions to be printed, rather
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than the target paths of the expressions themselves.
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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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</varlistentry>
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<varlistentry>
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<term><option>--requisites</option></term>
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<listitem>
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<para>
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Prints out the requisite paths of the Nix expressions indicated
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by the identifiers <replaceable>args</replaceable>. The
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requisite paths of a Nix expression are the paths that need to be
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present in the system to be able to realise the expression. That
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is, they form the <emphasis>closure</emphasis> of the expression
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in the file system (i.e., no path in the set of requisite paths
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points to anything outside the set of requisite paths).
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</para>
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<para>
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The notion of requisite paths is very useful when one wants to
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distribute Nix expressions. Since they form a closure, they are
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the only paths one needs to distribute to another system to be
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able to realise the expression on the other system.
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</para>
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<para>
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This query is generally used to implement various kinds of
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distribution. A <emphasis>source distribution</emphasis> is
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obtained by distributing the requisite paths of a derivation
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expression. A <emphasis>binary distribution</emphasis> is
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obtained by distributing the requisite paths of a slice
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expression (i.e., the normal form of a derivation expression; you
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can directly specify the identifier of the slice expression, or
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use <option>--normalise</option> and specify the identifier of a
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derivation expression). A <emphasis>cache
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distribution</emphasis> is obtained by distributing the
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requisite paths of a derivation expression and specifying the
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option <option>--include-successors</option>. This will include
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not just the paths of a source and binary distribution, but also
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all expressions and paths of subterms of the source. This is
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useful if one wants to realise on the target system a Nix
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expression that is similar but not quite the same as the one
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being distributed, since any common subterms will be reused.
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</para>
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<para>
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This query has a number of options:
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</para>
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<variablelist>
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<varlistentry>
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<term><option>--normalise</option></term>
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<listitem>
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<para>
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Causes the requisite paths of the <emphasis>normal
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forms</emphasis> of the expressions to be printed, rather
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than the requisite paths of the expressions themselves.
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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>--exclude-exprs</option></term>
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<listitem>
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<para>
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Excludes the paths of Nix expressions. This causes the
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closure property to be lost, that is, the resulting set of
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paths is not enough to ensure realisibility.
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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>--include-successors</option></term>
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<listitem>
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<para>
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Also include the requisites of successors (normal forms).
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Only the requisites of <emphasis>known</emphasis>
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successors are included, i.e., the normal forms of
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derivation expressions that have never been normalised will
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not be included.
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</para>
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<para>
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Note that not just the successor of a derivation expression
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will be included, but also the successors of all input
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expressions of that derivation expression. I.e., all
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normal forms of subterms involved in the normalisation of
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the top-level term are included.
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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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</varlistentry>
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<varlistentry>
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<term><option>--expansion</option></term>
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<listitem>
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<para>
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For each identifier in <replaceable>args</replaceable>, prints
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all expansions of that identifier, that is, all paths whose
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current content matches the identifier.
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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>--graph</option></term>
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<listitem>
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<para>
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Prints a graph of the closure of the expressions identified by
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<replaceable>args</replaceable> in the format of the
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<command>dot</command> tool of AT&T's GraphViz package.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect2>
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</refsect1>
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</refentry>
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<!--
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local variables:
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sgml-parent-document: ("book.xml" "refentry")
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end:
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-->
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