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https://github.com/NixOS/nix.git
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1526 lines
47 KiB
XML
1526 lines
47 KiB
XML
<refentry xmlns="http://docbook.org/ns/docbook"
|
||
xmlns:xlink="http://www.w3.org/1999/xlink"
|
||
xmlns:xi="http://www.w3.org/2001/XInclude"
|
||
version="5.0"
|
||
xml:id="sec-nix-store">
|
||
|
||
<refmeta>
|
||
<refentrytitle>nix-store</refentrytitle>
|
||
<manvolnum>1</manvolnum>
|
||
<refmiscinfo class="source">Nix</refmiscinfo>
|
||
<refmiscinfo class="version"><xi:include href="../version.txt" parse="text"/></refmiscinfo>
|
||
</refmeta>
|
||
|
||
<refnamediv>
|
||
<refname>nix-store</refname>
|
||
<refpurpose>manipulate or query the Nix store</refpurpose>
|
||
</refnamediv>
|
||
|
||
<refsynopsisdiv>
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="opt-common-syn.xml#xmlns(db=http://docbook.org/ns/docbook)xpointer(/db:nop/*)" />
|
||
<arg><option>--add-root</option> <replaceable>path</replaceable></arg>
|
||
<arg><option>--indirect</option></arg>
|
||
<arg choice='plain'><replaceable>operation</replaceable></arg>
|
||
<arg rep='repeat'><replaceable>options</replaceable></arg>
|
||
<arg rep='repeat'><replaceable>arguments</replaceable></arg>
|
||
</cmdsynopsis>
|
||
</refsynopsisdiv>
|
||
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The command <command>nix-store</command> performs primitive
|
||
operations on the Nix store. You generally do not need to run this
|
||
command manually.</para>
|
||
|
||
<para><command>nix-store</command> takes exactly one
|
||
<emphasis>operation</emphasis> flag which indicates the subcommand to
|
||
be performed. These are documented below.</para>
|
||
|
||
</refsection>
|
||
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection><title>Common options</title>
|
||
|
||
<para>This section lists the options that are common to all
|
||
operations. These options are allowed for every subcommand, though
|
||
they may not always have an effect. <phrase condition="manual">See
|
||
also <xref linkend="sec-common-options" /> for a list of common
|
||
options.</phrase></para>
|
||
|
||
<variablelist>
|
||
|
||
<varlistentry xml:id="opt-add-root"><term><option>--add-root</option> <replaceable>path</replaceable></term>
|
||
|
||
<listitem><para>Causes the result of a realisation
|
||
(<option>--realise</option> and <option>--force-realise</option>)
|
||
to be registered as a root of the garbage collector<phrase
|
||
condition="manual"> (see <xref linkend="ssec-gc-roots"
|
||
/>)</phrase>. The root is stored in
|
||
<replaceable>path</replaceable>, which must be inside a directory
|
||
that is scanned for roots by the garbage collector (i.e.,
|
||
typically in a subdirectory of
|
||
<filename>/nix/var/nix/gcroots/</filename>)
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||
<emphasis>unless</emphasis> the <option>--indirect</option> flag
|
||
is used.</para>
|
||
|
||
<para>If there are multiple results, then multiple symlinks will
|
||
be created by sequentially numbering symlinks beyond the first one
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||
(e.g., <filename>foo</filename>, <filename>foo-2</filename>,
|
||
<filename>foo-3</filename>, and so on).</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><option>--indirect</option></term>
|
||
|
||
<listitem>
|
||
|
||
<para>In conjunction with <option>--add-root</option>, this option
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||
allows roots to be stored <emphasis>outside</emphasis> of the GC
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||
roots directory. This is useful for commands such as
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||
<command>nix-build</command> that place a symlink to the build
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||
result in the current directory; such a build result should not be
|
||
garbage-collected unless the symlink is removed.</para>
|
||
|
||
<para>The <option>--indirect</option> flag causes a uniquely named
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||
symlink to <replaceable>path</replaceable> to be stored in
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||
<filename>/nix/var/nix/gcroots/auto/</filename>. For instance,
|
||
|
||
<screen>
|
||
$ nix-store --add-root /home/eelco/bla/result --indirect -r <replaceable>...</replaceable>
|
||
|
||
$ ls -l /nix/var/nix/gcroots/auto
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||
lrwxrwxrwx 1 ... 2005-03-13 21:10 dn54lcypm8f8... -> /home/eelco/bla/result
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||
|
||
$ ls -l /home/eelco/bla/result
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||
lrwxrwxrwx 1 ... 2005-03-13 21:10 /home/eelco/bla/result -> /nix/store/1r11343n6qd4...-f-spot-0.0.10</screen>
|
||
|
||
Thus, when <filename>/home/eelco/bla/result</filename> is removed,
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||
the GC root in the <filename>auto</filename> directory becomes a
|
||
dangling symlink and will be ignored by the collector.</para>
|
||
|
||
<warning><para>Note that it is not possible to move or rename
|
||
indirect GC roots, since the symlink in the
|
||
<filename>auto</filename> directory will still point to the old
|
||
location.</para></warning>
|
||
|
||
</listitem>
|
||
|
||
</varlistentry>
|
||
|
||
</variablelist>
|
||
|
||
<variablelist condition="manpage">
|
||
<xi:include href="opt-common.xml#xmlns(db=http://docbook.org/ns/docbook)xpointer(//db:variablelist[@xml:id='opt-common']/*)" />
|
||
</variablelist>
|
||
|
||
</refsection>
|
||
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection xml:id='rsec-nix-store-realise'><title>Operation <option>--realise</option></title>
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||
|
||
<refsection><title>Synopsis</title>
|
||
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<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>
|
||
<arg><option>--dry-run</option></arg>
|
||
</cmdsynopsis>
|
||
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The operation <option>--realise</option> essentially “builds”
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||
the specified store paths. Realisation is a somewhat overloaded term:
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||
|
||
<itemizedlist>
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||
|
||
<listitem><para>If the store path is a
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||
<emphasis>derivation</emphasis>, realisation ensures that the output
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||
paths of the derivation are <link
|
||
linkend="gloss-validity">valid</link> (i.e., the output path and its
|
||
closure exist in the file system). This can be done in several
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||
ways. First, it is possible that the outputs are already valid, in
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||
which case we are done immediately. Otherwise, there may be <link
|
||
linkend="gloss-substitute">substitutes</link> that produce the
|
||
outputs (e.g., by downloading them). Finally, the outputs can be
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||
produced by performing the build action described by the
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||
derivation.</para></listitem>
|
||
|
||
<listitem><para>If the store path is not a derivation, realisation
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||
ensures that the specified path is valid (i.e., it and its closure
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||
exist in the file system). If the path is already valid, we are
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||
done immediately. Otherwise, the path and any missing paths in its
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||
closure may be produced through substitutes. If there are no
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||
(successful) subsitutes, realisation fails.</para></listitem>
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||
|
||
</itemizedlist>
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||
|
||
</para>
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||
|
||
<para>The output path of each derivation is printed on standard
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||
output. (For non-derivations argument, the argument itself is
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||
printed.)</para>
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||
|
||
<para>The following flags are available:</para>
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||
|
||
<variablelist>
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||
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||
<varlistentry><term><option>--dry-run</option></term>
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||
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||
<listitem><para>Print on standard error a description of what
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||
packages would be built or downloaded, without actually performing
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||
the operation.</para></listitem>
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||
|
||
</varlistentry>
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||
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||
<varlistentry><term><option>--ignore-unknown</option></term>
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||
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||
<listitem><para>If a non-derivation path does not have a
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||
substitute, then silently ignore it.</para></listitem>
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||
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||
</varlistentry>
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||
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||
<varlistentry><term><option>--check</option></term>
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||
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||
<listitem><para>This option allows you to check whether a
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||
derivation is deterministic. It rebuilds the specified derivation
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||
and checks whether the result is bitwise-identical with the
|
||
existing outputs, printing an error if that’s not the case. The
|
||
outputs of the specified derivation must already exist. When used
|
||
with <option>-K</option>, if an output path is not identical to
|
||
the corresponding output from the previous build, the new output
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||
path is left in
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||
<filename>/nix/store/<replaceable>name</replaceable>.check.</filename></para>
|
||
|
||
<para>See also the <option>build-repeat</option> configuration
|
||
option, which repeats a derivation a number of times and prevents
|
||
its outputs from being registered as “valid” in the Nix store
|
||
unless they are identical.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
</variablelist>
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||
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||
<para>Special exit codes:</para>
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||
|
||
<variablelist>
|
||
|
||
<varlistentry><term><literal>100</literal></term>
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||
<listitem><para>Generic build failure, the builder process
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||
returned with a non-zero exit code.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><literal>101</literal></term>
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||
<listitem><para>Build timeout, the build was aborted because it
|
||
did not complete within the specified <link
|
||
linkend='conf-timeout'><literal>timeout</literal></link>.
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||
</para></listitem>
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||
</varlistentry>
|
||
|
||
<varlistentry><term><literal>102</literal></term>
|
||
<listitem><para>Hash mismatch, the build output was rejected
|
||
because it does not match the specified <link
|
||
linkend="fixed-output-drvs"><varname>outputHash</varname></link>.
|
||
</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><literal>104</literal></term>
|
||
<listitem><para>Not deterministic, the build succeeded in check
|
||
mode but the resulting output is not binary reproducable.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
</variablelist>
|
||
|
||
<para>With the <option>--keep-going</option> flag it's possible for
|
||
multiple failures to occur, in this case the 1xx status codes are or combined
|
||
using binary or. <screen>
|
||
1100100
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||
^^^^
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||
|||`- timeout
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||
||`-- output hash mismatch
|
||
|`--- build failure
|
||
`---- not deterministic
|
||
</screen></para>
|
||
|
||
</refsection>
|
||
|
||
|
||
<refsection><title>Examples</title>
|
||
|
||
<para>This operation is typically used to build store derivations
|
||
produced by <link
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||
linkend="sec-nix-instantiate"><command>nix-instantiate</command></link>:
|
||
|
||
<screen>
|
||
$ nix-store -r $(nix-instantiate ./test.nix)
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||
/nix/store/31axcgrlbfsxzmfff1gyj1bf62hvkby2-aterm-2.3.1</screen>
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||
|
||
This is essentially what <link
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||
linkend="sec-nix-build"><command>nix-build</command></link> does.</para>
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||
|
||
<para>To test whether a previously-built derivation is deterministic:
|
||
|
||
<screen>
|
||
$ nix-build '<nixpkgs>' -A hello --check -K
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||
</screen>
|
||
|
||
</para>
|
||
|
||
</refsection>
|
||
|
||
|
||
</refsection>
|
||
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection xml:id='rsec-nix-store-serve'><title>Operation <option>--serve</option></title>
|
||
|
||
<refsection><title>Synopsis</title>
|
||
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<arg choice='plain'><option>--serve</option></arg>
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||
<arg><option>--write</option></arg>
|
||
</cmdsynopsis>
|
||
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The operation <option>--serve</option> provides access to
|
||
the Nix store over stdin and stdout, and is intended to be used
|
||
as a means of providing Nix store access to a restricted ssh user.
|
||
</para>
|
||
|
||
<para>The following flags are available:</para>
|
||
|
||
<variablelist>
|
||
|
||
<varlistentry><term><option>--write</option></term>
|
||
|
||
<listitem><para>Allow the connected client to request the realization
|
||
of derivations. In effect, this can be used to make the host act
|
||
as a remote builder.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
</variablelist>
|
||
|
||
</refsection>
|
||
|
||
|
||
<refsection><title>Examples</title>
|
||
|
||
<para>To turn a host into a build server, the
|
||
<filename>authorized_keys</filename> file can be used to provide build
|
||
access to a given SSH public key:
|
||
|
||
<screen>
|
||
$ cat <<EOF >>/root/.ssh/authorized_keys
|
||
command="nice -n20 nix-store --serve --write" ssh-rsa AAAAB3NzaC1yc2EAAAA...
|
||
EOF
|
||
</screen>
|
||
|
||
</para>
|
||
|
||
</refsection>
|
||
|
||
|
||
</refsection>
|
||
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection xml:id='rsec-nix-store-gc'><title>Operation <option>--gc</option></title>
|
||
|
||
<refsection><title>Synopsis</title>
|
||
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<arg choice='plain'><option>--gc</option></arg>
|
||
<group>
|
||
<arg choice='plain'><option>--print-roots</option></arg>
|
||
<arg choice='plain'><option>--print-live</option></arg>
|
||
<arg choice='plain'><option>--print-dead</option></arg>
|
||
<arg choice='plain'><option>--delete</option></arg>
|
||
</group>
|
||
<arg><option>--max-freed</option> <replaceable>bytes</replaceable></arg>
|
||
</cmdsynopsis>
|
||
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>Without additional flags, the operation <option>--gc</option>
|
||
performs a garbage collection on the Nix store. That is, all paths in
|
||
the Nix store not reachable via file system references from a set of
|
||
“roots”, are deleted.</para>
|
||
|
||
<para>The following suboperations may be specified:</para>
|
||
|
||
<variablelist>
|
||
|
||
<varlistentry><term><option>--print-roots</option></term>
|
||
|
||
<listitem><para>This operation prints on standard output the set
|
||
of roots used by the garbage collector. What constitutes a root
|
||
is described in <xref linkend="ssec-gc-roots"
|
||
/>.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><option>--print-live</option></term>
|
||
|
||
<listitem><para>This operation prints on standard output the set
|
||
of “live” store paths, which are all the store paths reachable
|
||
from the roots. Live paths should never be deleted, since that
|
||
would break consistency — it would become possible that
|
||
applications are installed that reference things that are no
|
||
longer present in the store.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><option>--print-dead</option></term>
|
||
|
||
<listitem><para>This operation prints out on standard output the
|
||
set of “dead” store paths, which is just the opposite of the set
|
||
of live paths: any path in the store that is not live (with
|
||
respect to the roots) is dead.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><option>--delete</option></term>
|
||
|
||
<listitem><para>This operation performs an actual garbage
|
||
collection. All dead paths are removed from the
|
||
store. This is the default.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
</variablelist>
|
||
|
||
<para>By default, all unreachable paths are deleted. The following
|
||
options control what gets deleted and in what order:
|
||
|
||
<variablelist>
|
||
|
||
<varlistentry><term><option>--max-freed</option> <replaceable>bytes</replaceable></term>
|
||
|
||
<listitem><para>Keep deleting paths until at least
|
||
<replaceable>bytes</replaceable> bytes have been deleted, then
|
||
stop. The argument <replaceable>bytes</replaceable> can be
|
||
followed by the multiplicative suffix <literal>K</literal>,
|
||
<literal>M</literal>, <literal>G</literal> or
|
||
<literal>T</literal>, denoting KiB, MiB, GiB or TiB
|
||
units.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
</variablelist>
|
||
|
||
</para>
|
||
|
||
<para>The behaviour of the collector is also influenced by the <link
|
||
linkend="conf-keep-outputs"><literal>keep-outputs</literal></link>
|
||
and <link
|
||
linkend="conf-keep-derivations"><literal>keep-derivations</literal></link>
|
||
variables in the Nix configuration file.</para>
|
||
|
||
<para>With <option>--delete</option>, the collector prints the total
|
||
number of freed bytes when it finishes (or when it is interrupted).
|
||
With <option>--print-dead</option>, it prints the number of bytes that
|
||
would be freed.</para>
|
||
|
||
</refsection>
|
||
|
||
|
||
<refsection><title>Examples</title>
|
||
|
||
<para>To delete all unreachable paths, just do:
|
||
|
||
<screen>
|
||
$ nix-store --gc
|
||
deleting `/nix/store/kq82idx6g0nyzsp2s14gfsc38npai7lf-cairo-1.0.4.tar.gz.drv'
|
||
<replaceable>...</replaceable>
|
||
8825586 bytes freed (8.42 MiB)</screen>
|
||
|
||
</para>
|
||
|
||
<para>To delete at least 100 MiBs of unreachable paths:
|
||
|
||
<screen>
|
||
$ nix-store --gc --max-freed $((100 * 1024 * 1024))</screen>
|
||
|
||
</para>
|
||
|
||
</refsection>
|
||
|
||
|
||
</refsection>
|
||
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection><title>Operation <option>--delete</option></title>
|
||
|
||
<refsection><title>Synopsis</title>
|
||
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<arg choice='plain'><option>--delete</option></arg>
|
||
<arg><option>--ignore-liveness</option></arg>
|
||
<arg choice='plain' rep='repeat'><replaceable>paths</replaceable></arg>
|
||
</cmdsynopsis>
|
||
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The operation <option>--delete</option> deletes the store paths
|
||
<replaceable>paths</replaceable> from the Nix store, but only if it is
|
||
safe to do so; that is, when the path is not reachable from a root of
|
||
the garbage collector. This means that you can only delete paths that
|
||
would also be deleted by <literal>nix-store --gc</literal>. Thus,
|
||
<literal>--delete</literal> is a more targeted version of
|
||
<literal>--gc</literal>.</para>
|
||
|
||
<para>With the option <option>--ignore-liveness</option>, reachability
|
||
from the roots is ignored. However, the path still won’t be deleted
|
||
if there are other paths in the store that refer to it (i.e., depend
|
||
on it).</para>
|
||
|
||
</refsection>
|
||
|
||
<refsection><title>Example</title>
|
||
|
||
<screen>
|
||
$ nix-store --delete /nix/store/zq0h41l75vlb4z45kzgjjmsjxvcv1qk7-mesa-6.4
|
||
0 bytes freed (0.00 MiB)
|
||
error: cannot delete path `/nix/store/zq0h41l75vlb4z45kzgjjmsjxvcv1qk7-mesa-6.4' since it is still alive</screen>
|
||
|
||
</refsection>
|
||
|
||
</refsection>
|
||
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection xml:id='refsec-nix-store-query'><title>Operation <option>--query</option></title>
|
||
|
||
<refsection><title>Synopsis</title>
|
||
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<group choice='req'>
|
||
<arg choice='plain'><option>--query</option></arg>
|
||
<arg choice='plain'><option>-q</option></arg>
|
||
</group>
|
||
<group choice='req'>
|
||
<arg choice='plain'><option>--outputs</option></arg>
|
||
<arg choice='plain'><option>--requisites</option></arg>
|
||
<arg choice='plain'><option>-R</option></arg>
|
||
<arg choice='plain'><option>--references</option></arg>
|
||
<arg choice='plain'><option>--referrers</option></arg>
|
||
<arg choice='plain'><option>--referrers-closure</option></arg>
|
||
<arg choice='plain'><option>--deriver</option></arg>
|
||
<arg choice='plain'><option>-d</option></arg>
|
||
<arg choice='plain'><option>--graph</option></arg>
|
||
<arg choice='plain'><option>--tree</option></arg>
|
||
<arg choice='plain'><option>--binding</option> <replaceable>name</replaceable></arg>
|
||
<arg choice='plain'><option>-b</option> <replaceable>name</replaceable></arg>
|
||
<arg choice='plain'><option>--hash</option></arg>
|
||
<arg choice='plain'><option>--size</option></arg>
|
||
<arg choice='plain'><option>--roots</option></arg>
|
||
</group>
|
||
<arg><option>--use-output</option></arg>
|
||
<arg><option>-u</option></arg>
|
||
<arg><option>--force-realise</option></arg>
|
||
<arg><option>-f</option></arg>
|
||
<arg choice='plain' rep='repeat'><replaceable>paths</replaceable></arg>
|
||
</cmdsynopsis>
|
||
|
||
</refsection>
|
||
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The operation <option>--query</option> displays various bits of
|
||
information about the store paths . The queries are described below. At
|
||
most one query can be specified. The default query is
|
||
<option>--outputs</option>.</para>
|
||
|
||
<para>The paths <replaceable>paths</replaceable> may also be symlinks
|
||
from outside of the Nix store, to the Nix store. In that case, the
|
||
query is applied to the target of the symlink.</para>
|
||
|
||
|
||
</refsection>
|
||
|
||
|
||
<refsection><title>Common query options</title>
|
||
|
||
<variablelist>
|
||
|
||
<varlistentry><term><option>--use-output</option></term>
|
||
<term><option>-u</option></term>
|
||
|
||
<listitem><para>For each argument to the query that is a store
|
||
derivation, apply the query to the output path of the derivation
|
||
instead.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><option>--force-realise</option></term>
|
||
<term><option>-f</option></term>
|
||
|
||
<listitem><para>Realise each argument to the query first (see
|
||
<link linkend="rsec-nix-store-realise"><command>nix-store
|
||
--realise</command></link>).</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
</variablelist>
|
||
|
||
</refsection>
|
||
|
||
|
||
<refsection xml:id='nixref-queries'><title>Queries</title>
|
||
|
||
<variablelist>
|
||
|
||
<varlistentry><term><option>--outputs</option></term>
|
||
|
||
<listitem><para>Prints out the <link
|
||
linkend="gloss-output-path">output paths</link> of the store
|
||
derivations <replaceable>paths</replaceable>. These are the paths
|
||
that will be produced when the derivation is
|
||
built.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><option>--requisites</option></term>
|
||
<term><option>-R</option></term>
|
||
|
||
<listitem><para>Prints out the <link
|
||
linkend="gloss-closure">closure</link> of the store path
|
||
<replaceable>paths</replaceable>.</para>
|
||
|
||
<para>This query has one option:</para>
|
||
|
||
<variablelist>
|
||
|
||
<varlistentry><term><option>--include-outputs</option></term>
|
||
|
||
<listitem><para>Also include the output path of store
|
||
derivations, and their closures.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
</variablelist>
|
||
|
||
<para>This query can be used to implement various kinds of
|
||
deployment. A <emphasis>source deployment</emphasis> is obtained
|
||
by distributing the closure of a store derivation. A
|
||
<emphasis>binary deployment</emphasis> is obtained by distributing
|
||
the closure of an output path. A <emphasis>cache
|
||
deployment</emphasis> (combined source/binary deployment,
|
||
including binaries of build-time-only dependencies) is obtained by
|
||
distributing the closure of a store derivation and specifying the
|
||
option <option>--include-outputs</option>.</para>
|
||
|
||
</listitem>
|
||
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><option>--references</option></term>
|
||
|
||
<listitem><para>Prints the set of <link
|
||
linkend="gloss-reference">references</link> of the store paths
|
||
<replaceable>paths</replaceable>, that is, their immediate
|
||
dependencies. (For <emphasis>all</emphasis> dependencies, use
|
||
<option>--requisites</option>.)</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><option>--referrers</option></term>
|
||
|
||
<listitem><para>Prints the set of <emphasis>referrers</emphasis> of
|
||
the store paths <replaceable>paths</replaceable>, that is, the
|
||
store paths currently existing in the Nix store that refer to one
|
||
of <replaceable>paths</replaceable>. Note that contrary to the
|
||
references, the set of referrers is not constant; it can change as
|
||
store paths are added or removed.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><option>--referrers-closure</option></term>
|
||
|
||
<listitem><para>Prints the closure of the set of store paths
|
||
<replaceable>paths</replaceable> under the referrers relation; that
|
||
is, all store paths that directly or indirectly refer to one of
|
||
<replaceable>paths</replaceable>. These are all the path currently
|
||
in the Nix store that are dependent on
|
||
<replaceable>paths</replaceable>.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><option>--deriver</option></term>
|
||
<term><option>-d</option></term>
|
||
|
||
<listitem><para>Prints the <link
|
||
linkend="gloss-deriver">deriver</link> of the store paths
|
||
<replaceable>paths</replaceable>. If the path has no deriver
|
||
(e.g., if it is a source file), or if the deriver is not known
|
||
(e.g., in the case of a binary-only deployment), the string
|
||
<literal>unknown-deriver</literal> is printed.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><option>--graph</option></term>
|
||
|
||
<listitem><para>Prints the references graph of the store paths
|
||
<replaceable>paths</replaceable> in the format of the
|
||
<command>dot</command> tool of AT&T's <link
|
||
xlink:href="http://www.graphviz.org/">Graphviz package</link>.
|
||
This can be used to visualise dependency graphs. To obtain a
|
||
build-time dependency graph, apply this to a store derivation. To
|
||
obtain a runtime dependency graph, apply it to an output
|
||
path.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><option>--tree</option></term>
|
||
|
||
<listitem><para>Prints the references graph of the store paths
|
||
<replaceable>paths</replaceable> as a nested ASCII tree.
|
||
References are ordered by descending closure size; this tends to
|
||
flatten the tree, making it more readable. The query only
|
||
recurses into a store path when it is first encountered; this
|
||
prevents a blowup of the tree representation of the
|
||
graph.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><option>--graphml</option></term>
|
||
|
||
<listitem><para>Prints the references graph of the store paths
|
||
<replaceable>paths</replaceable> in the <link
|
||
xlink:href="http://graphml.graphdrawing.org/">GraphML</link> file format.
|
||
This can be used to visualise dependency graphs. To obtain a
|
||
build-time dependency graph, apply this to a store derivation. To
|
||
obtain a runtime dependency graph, apply it to an output
|
||
path.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><option>--binding</option> <replaceable>name</replaceable></term>
|
||
<term><option>-b</option> <replaceable>name</replaceable></term>
|
||
|
||
<listitem><para>Prints the value of the attribute
|
||
<replaceable>name</replaceable> (i.e., environment variable) of
|
||
the store derivations <replaceable>paths</replaceable>. It is an
|
||
error for a derivation to not have the specified
|
||
attribute.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><option>--hash</option></term>
|
||
|
||
<listitem><para>Prints the SHA-256 hash of the contents of the
|
||
store paths <replaceable>paths</replaceable> (that is, the hash of
|
||
the output of <command>nix-store --dump</command> on the given
|
||
paths). Since the hash is stored in the Nix database, this is a
|
||
fast operation.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><option>--size</option></term>
|
||
|
||
<listitem><para>Prints the size in bytes of the contents of the
|
||
store paths <replaceable>paths</replaceable> — to be precise, the
|
||
size of the output of <command>nix-store --dump</command> on the
|
||
given paths. Note that the actual disk space required by the
|
||
store paths may be higher, especially on filesystems with large
|
||
cluster sizes.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><option>--roots</option></term>
|
||
|
||
<listitem><para>Prints the garbage collector roots that point,
|
||
directly or indirectly, at the store paths
|
||
<replaceable>paths</replaceable>.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
</variablelist>
|
||
|
||
</refsection>
|
||
|
||
|
||
<refsection><title>Examples</title>
|
||
|
||
<para>Print the closure (runtime dependencies) of the
|
||
<command>svn</command> program in the current user environment:
|
||
|
||
<screen>
|
||
$ nix-store -qR $(which svn)
|
||
/nix/store/5mbglq5ldqld8sj57273aljwkfvj22mc-subversion-1.1.4
|
||
/nix/store/9lz9yc6zgmc0vlqmn2ipcpkjlmbi51vv-glibc-2.3.4
|
||
<replaceable>...</replaceable></screen>
|
||
|
||
</para>
|
||
|
||
<para>Print the build-time dependencies of <command>svn</command>:
|
||
|
||
<screen>
|
||
$ nix-store -qR $(nix-store -qd $(which svn))
|
||
/nix/store/02iizgn86m42q905rddvg4ja975bk2i4-grep-2.5.1.tar.bz2.drv
|
||
/nix/store/07a2bzxmzwz5hp58nf03pahrv2ygwgs3-gcc-wrapper.sh
|
||
/nix/store/0ma7c9wsbaxahwwl04gbw3fcd806ski4-glibc-2.3.4.drv
|
||
<replaceable>... lots of other paths ...</replaceable></screen>
|
||
|
||
The difference with the previous example is that we ask the closure of
|
||
the derivation (<option>-qd</option>), not the closure of the output
|
||
path that contains <command>svn</command>.</para>
|
||
|
||
<para>Show the build-time dependencies as a tree:
|
||
|
||
<screen>
|
||
$ nix-store -q --tree $(nix-store -qd $(which svn))
|
||
/nix/store/7i5082kfb6yjbqdbiwdhhza0am2xvh6c-subversion-1.1.4.drv
|
||
+---/nix/store/d8afh10z72n8l1cr5w42366abiblgn54-builder.sh
|
||
+---/nix/store/fmzxmpjx2lh849ph0l36snfj9zdibw67-bash-3.0.drv
|
||
| +---/nix/store/570hmhmx3v57605cqg9yfvvyh0nnb8k8-bash
|
||
| +---/nix/store/p3srsbd8dx44v2pg6nbnszab5mcwx03v-builder.sh
|
||
<replaceable>...</replaceable></screen>
|
||
|
||
</para>
|
||
|
||
<para>Show all paths that depend on the same OpenSSL library as
|
||
<command>svn</command>:
|
||
|
||
<screen>
|
||
$ nix-store -q --referrers $(nix-store -q --binding openssl $(nix-store -qd $(which svn)))
|
||
/nix/store/23ny9l9wixx21632y2wi4p585qhva1q8-sylpheed-1.0.0
|
||
/nix/store/5mbglq5ldqld8sj57273aljwkfvj22mc-subversion-1.1.4
|
||
/nix/store/dpmvp969yhdqs7lm2r1a3gng7pyq6vy4-subversion-1.1.3
|
||
/nix/store/l51240xqsgg8a7yrbqdx1rfzyv6l26fx-lynx-2.8.5</screen>
|
||
|
||
</para>
|
||
|
||
<para>Show all paths that directly or indirectly depend on the Glibc
|
||
(C library) used by <command>svn</command>:
|
||
|
||
<screen>
|
||
$ nix-store -q --referrers-closure $(ldd $(which svn) | grep /libc.so | awk '{print $3}')
|
||
/nix/store/034a6h4vpz9kds5r6kzb9lhh81mscw43-libgnomeprintui-2.8.2
|
||
/nix/store/15l3yi0d45prm7a82pcrknxdh6nzmxza-gawk-3.1.4
|
||
<replaceable>...</replaceable></screen>
|
||
|
||
Note that <command>ldd</command> is a command that prints out the
|
||
dynamic libraries used by an ELF executable.</para>
|
||
|
||
<para>Make a picture of the runtime dependency graph of the current
|
||
user environment:
|
||
|
||
<screen>
|
||
$ nix-store -q --graph ~/.nix-profile | dot -Tps > graph.ps
|
||
$ gv graph.ps</screen>
|
||
|
||
</para>
|
||
|
||
<para>Show every garbage collector root that points to a store path
|
||
that depends on <command>svn</command>:
|
||
|
||
<screen>
|
||
$ nix-store -q --roots $(which svn)
|
||
/nix/var/nix/profiles/default-81-link
|
||
/nix/var/nix/profiles/default-82-link
|
||
/nix/var/nix/profiles/per-user/eelco/profile-97-link
|
||
</screen>
|
||
|
||
</para>
|
||
|
||
</refsection>
|
||
|
||
|
||
</refsection>
|
||
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<!--
|
||
<refsection xml:id="rsec-nix-store-reg-val"><title>Operation <option>-XXX-register-validity</option></title>
|
||
|
||
<refsection><title>Synopsis</title>
|
||
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<arg choice='plain'><option>-XXX-register-validity</option></arg>
|
||
</cmdsynopsis>
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>TODO</para>
|
||
|
||
</refsection>
|
||
|
||
</refsection>
|
||
-->
|
||
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection><title>Operation <option>--add</option></title>
|
||
|
||
<refsection><title>Synopsis</title>
|
||
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<arg choice='plain'><option>--add</option></arg>
|
||
<arg choice='plain' rep='repeat'><replaceable>paths</replaceable></arg>
|
||
</cmdsynopsis>
|
||
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The operation <option>--add</option> adds the specified paths to
|
||
the Nix store. It prints the resulting paths in the Nix store on
|
||
standard output.</para>
|
||
|
||
</refsection>
|
||
|
||
<refsection><title>Example</title>
|
||
|
||
<screen>
|
||
$ nix-store --add ./foo.c
|
||
/nix/store/m7lrha58ph6rcnv109yzx1nk1cj7k7zf-foo.c</screen>
|
||
|
||
</refsection>
|
||
|
||
</refsection>
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection><title>Operation <option>--add-fixed</option></title>
|
||
|
||
<refsection><title>Synopsis</title>
|
||
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<arg><option>--recursive</option></arg>
|
||
<arg choice='plain'><option>--add-fixed</option></arg>
|
||
<arg choice='plain'><replaceable>algorithm</replaceable></arg>
|
||
<arg choice='plain' rep='repeat'><replaceable>paths</replaceable></arg>
|
||
</cmdsynopsis>
|
||
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The operation <option>--add-fixed</option> adds the specified paths to
|
||
the Nix store. Unlike <option>--add</option> paths are registered using the
|
||
specified hashing algorithm, resulting in the same output path as a fixed output
|
||
derivation. This can be used for sources that are not available from a public
|
||
url or broke since the download expression was written.
|
||
</para>
|
||
|
||
<para>This operation has the following options:
|
||
|
||
<variablelist>
|
||
|
||
<varlistentry><term><option>--recursive</option></term>
|
||
|
||
<listitem><para>
|
||
Use recursive instead of flat hashing mode, used when adding directories
|
||
to the store.
|
||
</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
</variablelist>
|
||
|
||
</para>
|
||
|
||
</refsection>
|
||
|
||
<refsection><title>Example</title>
|
||
|
||
<screen>
|
||
$ nix-store --add-fixed sha256 ./hello-2.10.tar.gz
|
||
/nix/store/3x7dwzq014bblazs7kq20p9hyzz0qh8g-hello-2.10.tar.gz</screen>
|
||
|
||
</refsection>
|
||
|
||
</refsection>
|
||
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection xml:id='refsec-nix-store-verify'><title>Operation <option>--verify</option></title>
|
||
|
||
<refsection>
|
||
<title>Synopsis</title>
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<arg choice='plain'><option>--verify</option></arg>
|
||
<arg><option>--check-contents</option></arg>
|
||
<arg><option>--repair</option></arg>
|
||
</cmdsynopsis>
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The operation <option>--verify</option> verifies the internal
|
||
consistency of the Nix database, and the consistency between the Nix
|
||
database and the Nix store. Any inconsistencies encountered are
|
||
automatically repaired. Inconsistencies are generally the result of
|
||
the Nix store or database being modified by non-Nix tools, or of bugs
|
||
in Nix itself.</para>
|
||
|
||
<para>This operation has the following options:
|
||
|
||
<variablelist>
|
||
|
||
<varlistentry><term><option>--check-contents</option></term>
|
||
|
||
<listitem><para>Checks that the contents of every valid store path
|
||
has not been altered by computing a SHA-256 hash of the contents
|
||
and comparing it with the hash stored in the Nix database at build
|
||
time. Paths that have been modified are printed out. For large
|
||
stores, <option>--check-contents</option> is obviously quite
|
||
slow.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
<varlistentry><term><option>--repair</option></term>
|
||
|
||
<listitem><para>If any valid path is missing from the store, or
|
||
(if <option>--check-contents</option> is given) the contents of a
|
||
valid path has been modified, then try to repair the path by
|
||
redownloading it. See <command>nix-store --repair-path</command>
|
||
for details.</para></listitem>
|
||
|
||
</varlistentry>
|
||
|
||
</variablelist>
|
||
|
||
</para>
|
||
|
||
</refsection>
|
||
|
||
|
||
</refsection>
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection><title>Operation <option>--verify-path</option></title>
|
||
|
||
<refsection>
|
||
<title>Synopsis</title>
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<arg choice='plain'><option>--verify-path</option></arg>
|
||
<arg choice='plain' rep='repeat'><replaceable>paths</replaceable></arg>
|
||
</cmdsynopsis>
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The operation <option>--verify-path</option> compares the
|
||
contents of the given store paths to their cryptographic hashes stored
|
||
in Nix’s database. For every changed path, it prints a warning
|
||
message. The exit status is 0 if no path has changed, and 1
|
||
otherwise.</para>
|
||
|
||
</refsection>
|
||
|
||
<refsection><title>Example</title>
|
||
|
||
<para>To verify the integrity of the <command>svn</command> command and all its dependencies:
|
||
|
||
<screen>
|
||
$ nix-store --verify-path $(nix-store -qR $(which svn))
|
||
</screen>
|
||
|
||
</para>
|
||
|
||
</refsection>
|
||
|
||
</refsection>
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection><title>Operation <option>--repair-path</option></title>
|
||
|
||
<refsection>
|
||
<title>Synopsis</title>
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<arg choice='plain'><option>--repair-path</option></arg>
|
||
<arg choice='plain' rep='repeat'><replaceable>paths</replaceable></arg>
|
||
</cmdsynopsis>
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The operation <option>--repair-path</option> attempts to
|
||
“repair” the specified paths by redownloading them using the available
|
||
substituters. If no substitutes are available, then repair is not
|
||
possible.</para>
|
||
|
||
<warning><para>During repair, there is a very small time window during
|
||
which the old path (if it exists) is moved out of the way and replaced
|
||
with the new path. If repair is interrupted in between, then the
|
||
system may be left in a broken state (e.g., if the path contains a
|
||
critical system component like the GNU C Library).</para></warning>
|
||
|
||
</refsection>
|
||
|
||
<refsection><title>Example</title>
|
||
|
||
<screen>
|
||
$ nix-store --verify-path /nix/store/dj7a81wsm1ijwwpkks3725661h3263p5-glibc-2.13
|
||
path `/nix/store/dj7a81wsm1ijwwpkks3725661h3263p5-glibc-2.13' was modified!
|
||
expected hash `2db57715ae90b7e31ff1f2ecb8c12ec1cc43da920efcbe3b22763f36a1861588',
|
||
got `481c5aa5483ebc97c20457bb8bca24deea56550d3985cda0027f67fe54b808e4'
|
||
|
||
$ nix-store --repair-path /nix/store/dj7a81wsm1ijwwpkks3725661h3263p5-glibc-2.13
|
||
fetching path `/nix/store/d7a81wsm1ijwwpkks3725661h3263p5-glibc-2.13'...
|
||
…
|
||
</screen>
|
||
|
||
</refsection>
|
||
|
||
</refsection>
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection xml:id='refsec-nix-store-dump'><title>Operation <option>--dump</option></title>
|
||
|
||
<refsection>
|
||
<title>Synopsis</title>
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<arg choice='plain'><option>--dump</option></arg>
|
||
<arg choice='plain'><replaceable>path</replaceable></arg>
|
||
</cmdsynopsis>
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The operation <option>--dump</option> produces a NAR (Nix
|
||
ARchive) file containing the contents of the file system tree rooted
|
||
at <replaceable>path</replaceable>. The archive is written to
|
||
standard output.</para>
|
||
|
||
<para>A NAR archive is like a TAR or Zip archive, but it contains only
|
||
the information that Nix considers important. For instance,
|
||
timestamps are elided because all files in the Nix store have their
|
||
timestamp set to 0 anyway. Likewise, all permissions are left out
|
||
except for the execute bit, because all files in the Nix store have
|
||
644 or 755 permission.</para>
|
||
|
||
<para>Also, a NAR archive is <emphasis>canonical</emphasis>, meaning
|
||
that “equal” paths always produce the same NAR archive. For instance,
|
||
directory entries are always sorted so that the actual on-disk order
|
||
doesn’t influence the result. This means that the cryptographic hash
|
||
of a NAR dump of a path is usable as a fingerprint of the contents of
|
||
the path. Indeed, the hashes of store paths stored in Nix’s database
|
||
(see <link linkend="refsec-nix-store-query"><literal>nix-store -q
|
||
--hash</literal></link>) are SHA-256 hashes of the NAR dump of each
|
||
store path.</para>
|
||
|
||
<para>NAR archives support filenames of unlimited length and 64-bit
|
||
file sizes. They can contain regular files, directories, and symbolic
|
||
links, but not other types of files (such as device nodes).</para>
|
||
|
||
<para>A Nix archive can be unpacked using <literal>nix-store
|
||
--restore</literal>.</para>
|
||
|
||
</refsection>
|
||
|
||
|
||
</refsection>
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection><title>Operation <option>--restore</option></title>
|
||
|
||
<refsection>
|
||
<title>Synopsis</title>
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<arg choice='plain'><option>--restore</option></arg>
|
||
<arg choice='plain'><replaceable>path</replaceable></arg>
|
||
</cmdsynopsis>
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The operation <option>--restore</option> unpacks a NAR archive
|
||
to <replaceable>path</replaceable>, which must not already exist. The
|
||
archive is read from standard input.</para>
|
||
|
||
</refsection>
|
||
|
||
|
||
</refsection>
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection xml:id='refsec-nix-store-export'><title>Operation <option>--export</option></title>
|
||
|
||
<refsection>
|
||
<title>Synopsis</title>
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<arg choice='plain'><option>--export</option></arg>
|
||
<arg choice='plain' rep='repeat'><replaceable>paths</replaceable></arg>
|
||
</cmdsynopsis>
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The operation <option>--export</option> writes a serialisation
|
||
of the specified store paths to standard output in a format that can
|
||
be imported into another Nix store with <command
|
||
linkend="refsec-nix-store-import">nix-store --import</command>. This
|
||
is like <command linkend="refsec-nix-store-dump">nix-store
|
||
--dump</command>, except that the NAR archive produced by that command
|
||
doesn’t contain the necessary meta-information to allow it to be
|
||
imported into another Nix store (namely, the set of references of the
|
||
path).</para>
|
||
|
||
<para>This command does not produce a <emphasis>closure</emphasis> of
|
||
the specified paths, so if a store path references other store paths
|
||
that are missing in the target Nix store, the import will fail. To
|
||
copy a whole closure, do something like:
|
||
|
||
<screen>
|
||
$ nix-store --export $(nix-store -qR <replaceable>paths</replaceable>) > out</screen>
|
||
|
||
To import the whole closure again, run:
|
||
|
||
<screen>
|
||
$ nix-store --import < out</screen>
|
||
|
||
</para>
|
||
|
||
</refsection>
|
||
|
||
|
||
</refsection>
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection xml:id='refsec-nix-store-import'><title>Operation <option>--import</option></title>
|
||
|
||
<refsection>
|
||
<title>Synopsis</title>
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<arg choice='plain'><option>--import</option></arg>
|
||
</cmdsynopsis>
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The operation <option>--import</option> reads a serialisation of
|
||
a set of store paths produced by <command
|
||
linkend="refsec-nix-store-export">nix-store --export</command> from
|
||
standard input and adds those store paths to the Nix store. Paths
|
||
that already exist in the Nix store are ignored. If a path refers to
|
||
another path that doesn’t exist in the Nix store, the import
|
||
fails.</para>
|
||
|
||
</refsection>
|
||
|
||
|
||
</refsection>
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection><title>Operation <option>--optimise</option></title>
|
||
|
||
<refsection>
|
||
<title>Synopsis</title>
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<arg choice='plain'><option>--optimise</option></arg>
|
||
</cmdsynopsis>
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The operation <option>--optimise</option> reduces Nix store disk
|
||
space usage by finding identical files in the store and hard-linking
|
||
them to each other. It typically reduces the size of the store by
|
||
something like 25-35%. Only regular files and symlinks are
|
||
hard-linked in this manner. Files are considered identical when they
|
||
have the same NAR archive serialisation: that is, regular files must
|
||
have the same contents and permission (executable or non-executable),
|
||
and symlinks must have the same contents.</para>
|
||
|
||
<para>After completion, or when the command is interrupted, a report
|
||
on the achieved savings is printed on standard error.</para>
|
||
|
||
<para>Use <option>-vv</option> or <option>-vvv</option> to get some
|
||
progress indication.</para>
|
||
|
||
</refsection>
|
||
|
||
<refsection><title>Example</title>
|
||
|
||
<screen>
|
||
$ nix-store --optimise
|
||
hashing files in `/nix/store/qhqx7l2f1kmwihc9bnxs7rc159hsxnf3-gcc-4.1.1'
|
||
<replaceable>...</replaceable>
|
||
541838819 bytes (516.74 MiB) freed by hard-linking 54143 files;
|
||
there are 114486 files with equal contents out of 215894 files in total
|
||
</screen>
|
||
|
||
</refsection>
|
||
|
||
|
||
</refsection>
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection><title>Operation <option>--read-log</option></title>
|
||
|
||
<refsection>
|
||
<title>Synopsis</title>
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<group choice='req'>
|
||
<arg choice='plain'><option>--read-log</option></arg>
|
||
<arg choice='plain'><option>-l</option></arg>
|
||
</group>
|
||
<arg choice='plain' rep='repeat'><replaceable>paths</replaceable></arg>
|
||
</cmdsynopsis>
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The operation <option>--read-log</option> prints the build log
|
||
of the specified store paths on standard output. The build log is
|
||
whatever the builder of a derivation wrote to standard output and
|
||
standard error. If a store path is not a derivation, the deriver of
|
||
the store path is used.</para>
|
||
|
||
<para>Build logs are kept in
|
||
<filename>/nix/var/log/nix/drvs</filename>. However, there is no
|
||
guarantee that a build log is available for any particular store path.
|
||
For instance, if the path was downloaded as a pre-built binary through
|
||
a substitute, then the log is unavailable.</para>
|
||
|
||
</refsection>
|
||
|
||
<refsection><title>Example</title>
|
||
|
||
<screen>
|
||
$ nix-store -l $(which ktorrent)
|
||
building /nix/store/dhc73pvzpnzxhdgpimsd9sw39di66ph1-ktorrent-2.2.1
|
||
unpacking sources
|
||
unpacking source archive /nix/store/p8n1jpqs27mgkjw07pb5269717nzf5f8-ktorrent-2.2.1.tar.gz
|
||
ktorrent-2.2.1/
|
||
ktorrent-2.2.1/NEWS
|
||
<replaceable>...</replaceable>
|
||
</screen>
|
||
|
||
</refsection>
|
||
|
||
|
||
</refsection>
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection><title>Operation <option>--dump-db</option></title>
|
||
|
||
<refsection>
|
||
<title>Synopsis</title>
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<arg choice='plain'><option>--dump-db</option></arg>
|
||
<arg rep='repeat'><replaceable>paths</replaceable></arg>
|
||
</cmdsynopsis>
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The operation <option>--dump-db</option> writes a dump of the
|
||
Nix database to standard output. It can be loaded into an empty Nix
|
||
store using <option>--load-db</option>. This is useful for making
|
||
backups and when migrating to different database schemas.</para>
|
||
|
||
<para>By default, <option>--dump-db</option> will dump the entire Nix
|
||
database. When one or more store paths is passed, only the subset of
|
||
the Nix database for those store paths is dumped. As with
|
||
<option>--export</option>, the user is responsible for passing all the
|
||
store paths for a closure. See <option>--export</option> for an
|
||
example.</para>
|
||
|
||
</refsection>
|
||
|
||
</refsection>
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection><title>Operation <option>--load-db</option></title>
|
||
|
||
<refsection>
|
||
<title>Synopsis</title>
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<arg choice='plain'><option>--load-db</option></arg>
|
||
</cmdsynopsis>
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The operation <option>--load-db</option> reads a dump of the Nix
|
||
database created by <option>--dump-db</option> from standard input and
|
||
loads it into the Nix database.</para>
|
||
|
||
</refsection>
|
||
|
||
</refsection>
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection><title>Operation <option>--print-env</option></title>
|
||
|
||
<refsection>
|
||
<title>Synopsis</title>
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<arg choice='plain'><option>--print-env</option></arg>
|
||
<arg choice='plain'><replaceable>drvpath</replaceable></arg>
|
||
</cmdsynopsis>
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>The operation <option>--print-env</option> prints out the
|
||
environment of a derivation in a format that can be evaluated by a
|
||
shell. The command line arguments of the builder are placed in the
|
||
variable <envar>_args</envar>.</para>
|
||
|
||
</refsection>
|
||
|
||
<refsection><title>Example</title>
|
||
|
||
<screen>
|
||
$ nix-store --print-env $(nix-instantiate '<nixpkgs>' -A firefox)
|
||
<replaceable>…</replaceable>
|
||
export src; src='/nix/store/plpj7qrwcz94z2psh6fchsi7s8yihc7k-firefox-12.0.source.tar.bz2'
|
||
export stdenv; stdenv='/nix/store/7c8asx3yfrg5dg1gzhzyq2236zfgibnn-stdenv'
|
||
export system; system='x86_64-linux'
|
||
export _args; _args='-e /nix/store/9krlzvny65gdc8s7kpb6lkx8cd02c25c-default-builder.sh'
|
||
</screen>
|
||
|
||
</refsection>
|
||
|
||
</refsection>
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection xml:id='rsec-nix-store-generate-binary-cache-key'><title>Operation <option>--generate-binary-cache-key</option></title>
|
||
|
||
<refsection>
|
||
<title>Synopsis</title>
|
||
<cmdsynopsis>
|
||
<command>nix-store</command>
|
||
<arg choice='plain'>
|
||
<option>--generate-binary-cache-key</option>
|
||
<option>key-name</option>
|
||
<option>secret-key-file</option>
|
||
<option>public-key-file</option>
|
||
</arg>
|
||
</cmdsynopsis>
|
||
</refsection>
|
||
|
||
<refsection><title>Description</title>
|
||
|
||
<para>This command generates an <link
|
||
xlink:href="http://ed25519.cr.yp.to/">Ed25519 key pair</link> that can
|
||
be used to create a signed binary cache. It takes three mandatory
|
||
parameters:
|
||
|
||
<orderedlist>
|
||
|
||
<listitem><para>A key name, such as
|
||
<literal>cache.example.org-1</literal>, that is used to look up keys
|
||
on the client when it verifies signatures. It can be anything, but
|
||
it’s suggested to use the host name of your cache
|
||
(e.g. <literal>cache.example.org</literal>) with a suffix denoting
|
||
the number of the key (to be incremented every time you need to
|
||
revoke a key).</para></listitem>
|
||
|
||
<listitem><para>The file name where the secret key is to be
|
||
stored.</para></listitem>
|
||
|
||
<listitem><para>The file name where the public key is to be
|
||
stored.</para></listitem>
|
||
|
||
</orderedlist>
|
||
|
||
</para>
|
||
|
||
</refsection>
|
||
|
||
</refsection>
|
||
|
||
|
||
<!--######################################################################-->
|
||
|
||
<refsection condition="manpage"><title>Environment variables</title>
|
||
|
||
<variablelist>
|
||
<xi:include href="env-common.xml#xmlns(db=http://docbook.org/ns/docbook)xpointer(//db:variablelist[@xml:id='env-common']/*)" />
|
||
</variablelist>
|
||
|
||
</refsection>
|
||
|
||
|
||
</refentry>
|