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564 lines
18 KiB
XML
564 lines
18 KiB
XML
<refentry>
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<refnamediv>
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<refname>nix-store</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-store</command>
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&opt-common-syn;
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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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<refsection>
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<title>Description</title>
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<para>
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The command <command>nix-store</command> performs primitive
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operations on the Nix store. You generally do not need to run
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this command manually.
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</para>
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<para>
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<command>nix-store</command> takes exactly one
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<emphasis>operation</emphasis> flag which indicates the
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subcommand to be performed. These are documented below.
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</para>
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</refsection>
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<!--######################################################################-->
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<refsection>
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<title>Common options</title>
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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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</para>
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<variablelist>
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&opt-common;
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</variablelist>
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</refsection>
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<!--######################################################################-->
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<refsection>
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<title>Environment variables</title>
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<para>
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The following environment variables affect the behaviour of
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<command>nix-store</command>.
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</para>
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<variablelist>
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<varlistentry>
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<term><envar>TMPDIR</envar>=<replaceable>path</replaceable></term>
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<listitem>
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<para>
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Use the directory <replaceable>path</replaceable> to store
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temporary files. In particular, this includes temporary
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build directories; these can take up substantial amounts
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of disk space. The default is <filename>/tmp</filename>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsection>
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<!--######################################################################-->
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<refsection>
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<title>Operation <option>--realise</option></title>
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<refsection>
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<title>Synopsis</title>
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<cmdsynopsis>
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<command>nix-store</command>
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<group choice='req'>
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<arg choice='plain'><option>--realise</option></arg>
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<arg choice='plain'><option>-r</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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</refsection>
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<refsection>
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<title>Description</title>
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<para>
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The operation <option>--install</option> realises in the file
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system the store expressions stored in
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<replaceable>paths</replaceable>. If these expressions are
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derivation expressions, they are first
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<emphasis>normalised</emphasis> into a closure expression.
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This may happen in two ways. First, the corresponding closure
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expression (the <emphasis>successor</emphasis>) may already
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known (either because the build has already been performed, or
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because a successor was explicitly registered through the
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<option>--successor</option> operation). Otherwise, the build
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action described by the derivation is performed, and a closure
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expression is computed by scanning the result of the build for
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references to other paths in the store.
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</para>
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<para>
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The paths of the closure expression corresponding to each
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expression in <replaceable>paths</replaceable> is printed on
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standard output.
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</para>
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</refsection>
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</refsection>
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<!--######################################################################-->
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<refsection>
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<title>Operation <option>--gc</option></title>
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<refsection>
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<title>Synopsis</title>
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<cmdsynopsis>
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<command>nix-store</command>
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<arg choice='plain'><option>--gc</option></arg>
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<group choice='req'>
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<arg choice='plain'><option>--print-live</option></arg>
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<arg choice='plain'><option>--print-dead</option></arg>
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<arg choice='plain'><option>--delete</option></arg>
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</group>
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<arg><option>--min-age</option> <replaceable>age</replaceable></arg>
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</cmdsynopsis>
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</refsection>
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<refsection>
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<title>Description</title>
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<para>
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The operation <option>--gc</option> performs a garbage
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collection on the Nix store. What it does specifically is
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determined by the sub-operation, which is one of the
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following:
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</para>
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<variablelist>
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<varlistentry>
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<term><option>--print-live</option></term>
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<listitem>
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<para>
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This operation prints on standard output the set of
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<quote>live</quote> store paths, which are all the store
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paths reachable from a set of <quote>root</quote> store
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expressions read from standard input. Live paths should
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never be deleted, since that would break consistency —
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it would become possible that applications are installed
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that reference things that are no longer present in the
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store.
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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>--print-dead</option></term>
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<listitem>
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<para>
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This operation prints out on standard output the set of
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<quote>dead</quote> store paths, which is just the
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opposite of the set of live paths: any path in the store
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that is not live (with respect to the roots) is dead.
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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>--delete</option></term>
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<listitem>
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<para>
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This operation performs an actual garbage collection.
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All dead paths are removed from the store.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>
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The set of root store expressions is read from standard input.
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Each line should contain exactly one store path.
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</para>
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<para>
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The option <option>--min-age</option> specifies a minimum time
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in hours that an unreachable store path must not have been
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used before it is considered dead. The default is 0 (consider
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all unreachable store paths dead). Whether a store path has
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been used is determined by looking at its access time
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(<literal>atime</literal>), so this does not work if the store
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is located on a file system that has the
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<literal>noatime</literal> option set.
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</para>
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<warning>
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<para>
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You generally will want to use the command
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<command>nix-collect-garbage</command>, which figures out
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the roots and then calls this command automatically.
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</para>
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</warning>
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</refsection>
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</refsection>
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<!--######################################################################-->
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<refsection>
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<title>Operation <option>--query</option></title>
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<refsection>
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<title>Synopsis</title>
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<cmdsynopsis>
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<command>nix-store</command>
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<group choice='req'>
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<arg choice='plain'><option>--query</option></arg>
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<arg choice='plain'><option>-q</option></arg>
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</group>
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<group choice='req'>
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<arg choice='plain'><option>--list</option></arg>
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<arg choice='plain'><option>-l</option></arg>
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<arg choice='plain'><option>--requisites</option></arg>
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<arg choice='plain'><option>-R</option></arg>
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<arg choice='plain'><option>--predecessors</option></arg>
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<arg choice='plain'><option>--graph</option></arg>
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</group>
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<arg><option>--normalise</option></arg>
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<arg><option>-n</option></arg>
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<arg><option>--force-realise</option></arg>
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<arg><option>-f</option></arg>
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<arg choice='plain' rep='repeat'><replaceable>args</replaceable></arg>
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</cmdsynopsis>
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</refsection>
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<refsection>
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<title>Description</title>
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<para>
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The operation <option>--query</option> displays various bits
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of information about store expressions or store paths. The
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queries are described below. At most one query can be
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specified. The default query is <option>--list</option>.
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</para>
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</refsection>
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<refsection>
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<title>Common query options</title>
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<variablelist>
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<varlistentry>
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<term><option>--normalise</option> / <option>-n</option></term>
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<listitem>
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<para>
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For those queries that take a Nix store expression, this
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option causes those expressions to be normalised first.
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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>--force-realise</option> / <option>-f</option></term>
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<listitem>
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<para>
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For those queries that take a Nix store expression, this
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option causes those expressions to be realised first.
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This is just a short-cut for the common idiom
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</para>
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<screen>
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nix-store --realise /nix/store/bla.store
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x=`nix-store --query --normalise /nix/store/bla.store`
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<emphasis>(do something with the path $x</emphasis></screen>
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<para>
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which using this flag can be written as
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</para>
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<screen>
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x=`nix-store --query --normalise --force-realise /nix/store/bla.store`
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<emphasis>(do something with the path $x</emphasis></screen>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsection>
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<refsection 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> / <option>-l</option></term>
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<listitem>
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<para>
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Prints out the <emphasis>output paths</emphasis> of the
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store expressions indicated by the identifiers
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<replaceable>args</replaceable>. In the case of a
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derivation expression, these are the paths that will be
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produced when the derivation is realised. In the case
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of a closure expression, these are the paths that were
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produced the derivation expression of which the closure
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expression is a successor.
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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>--requisites</option> / <option>-R</option></term>
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<listitem>
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<para>
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Prints out the requisite paths of the store expressions
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indicated by the identifiers
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<replaceable>args</replaceable>. The requisite paths of
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a Nix expression are the paths that need to be present
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in the system to be able to realise the expression.
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That is, they form the <emphasis>closure</emphasis> of
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the expression in the file system (i.e., no path in the
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set of requisite paths points to anything outside the
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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
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wants to distribute store expressions. Since they form a
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closure, they are the only paths one needs to distribute
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to another system to be able to realise the expression
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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
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of deployment. A <emphasis>source deployment</emphasis>
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is obtained by distributing the requisite paths of a
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derivation expression. A <emphasis>binary
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deployment</emphasis> is obtained by distributing the
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requisite paths of a closure expression. A
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<emphasis>cache deployment</emphasis> is obtained by
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distributing the requisite paths of a derivation
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expression and specifying the option
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<option>--include-successors</option>. This will
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include not just the paths of a source and binary
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deployment, but also all expressions and paths of
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subterms of the source. This is useful if one wants to
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realise on the target system a Nix expression that is
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similar but not quite the same as the one being
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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>--exclude-exprs</option></term>
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<listitem>
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<para>
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Excludes the paths of store expressions. This
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causes the closure property to be lost, that is,
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the resulting set of paths is not enough to ensure
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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>--predecessors</option></term>
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<listitem>
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<para>
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For each store expression stored at paths
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<replaceable>args</replaceable>, prints its
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<emphasis>predecessors</emphasis>. A derivation
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expression <varname>p</varname> is a predecessor of a
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store expression <varname>q</varname> iff
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<varname>q</varname> is a successor of
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<varname>p</varname>.
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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 store expressions
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identified by <replaceable>args</replaceable> in the
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format of the <command>dot</command> tool of AT&T's
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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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</refsection>
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</refsection>
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<!--######################################################################-->
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<refsection>
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<title>Operation <option>--successor</option></title>
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<refsection>
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<title>Synopsis</title>
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<cmdsynopsis>
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<command>nix-store</command>
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<arg choice='req'><option>--successor</option></arg>
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<arg choice='plain'
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rep='repeat'><replaceable>srcpath</replaceable> <replaceable>sucpath</replaceable></arg>
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</cmdsynopsis>
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</refsection>
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<refsection>
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<title>Description</title>
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<para>
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The operation <option>--successor</option> registers that the
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closure expression in <replaceable>sucpath</replaceable> is a
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successor of the derivation expression in
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<replaceable>srcpath</replaceable>. This is used to implement
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binary deployment.
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</para>
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</refsection>
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</refsection>
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<!--######################################################################-->
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<refsection>
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<title>Operation <option>--substitute</option></title>
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<refsection>
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<title>Synopsis</title>
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<cmdsynopsis>
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<command>nix-store</command>
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<arg choice='req'><option>--substitute</option></arg>
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<arg choice='plain'
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rep='repeat'><replaceable>srcpath</replaceable> <replaceable>subpath</replaceable></arg>
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</cmdsynopsis>
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</refsection>
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<refsection>
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<title>Description</title>
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<para>
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The operation <option>--substitute</option> registers that the
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store path <replaceable>srcpath</replaceable> can be built by
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realising the derivation expression in
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<replaceable>subpath</replaceable>. This is used to implement
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binary deployment.
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</para>
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</refsection>
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</refsection>
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<!--######################################################################-->
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<refsection>
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<title>Operation <option>--verify</option></title>
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<refsection>
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<title>Synopsis</title>
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<cmdsynopsis>
|
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<command>nix-store</command>
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<arg choice='req'><option>--verify</option></arg>
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</cmdsynopsis>
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</refsection>
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<refsection>
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<title>Description</title>
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<para>
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The operation <option>--verify</option> verifies the internal
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consistency of the Nix database, and the consistency between
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the Nix database and the Nix store. Any inconsistencies
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encountered are automatically repaired. Inconsistencies are
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generally the result of the Nix store or database being
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modified by non-Nix tools, or of bugs in Nix itself.
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</para>
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</refsection>
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</refsection>
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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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