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* GC docs.

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Eelco Dolstra 2005-04-07 08:17:04 +00:00
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commit 806b91f104
3 changed files with 112 additions and 177 deletions
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92
doc/manual/nix-collect-garbage.xml
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@ -1,77 +1,29 @@
<refentry> <refentry>
<refnamediv>
<refname>nix-collect-garbage</refname> <refnamediv>
<refpurpose>remove unreachable store paths</refpurpose> <refname>nix-collect-garbage</refname>
</refnamediv> <refpurpose>delete unreachable store paths</refpurpose>
</refnamediv>
<refsynopsisdiv> <refsynopsisdiv>
<cmdsynopsis> <cmdsynopsis>
<command>nix-collect-garbage</command> <command>nix-collect-garbage</command>
<group choice='opt'> <group choice='opt'>
<arg choice='plain'><option>--print-live</option></arg> <arg choice='plain'><option>--print-roots</option></arg>
<arg choice='plain'><option>--print-dead</option></arg> <arg choice='plain'><option>--print-live</option></arg>
</group> <arg choice='plain'><option>--print-dead</option></arg>
<arg><option>--min-age</option> <replaceable>age</replaceable></arg> <arg choice='plain'><option>--delete</option></arg>
</cmdsynopsis> </group>
</refsynopsisdiv> </cmdsynopsis>
</refsynopsisdiv>
<refsection> <refsection><title>Description</title>
<title>Description</title>
<para> <para>The command <command>nix-collect-garbage</command> is an
The command <command>nix-collect-garbage</command> performs a obsolete wrapper around <link
garbage collection on the Nix store: any paths in the Nix store linkend="rsec-nix-store-gc"><command>nix-store
that are garbage (not reachable from a set of root store --gc</command></link>.</para>
expressions) are deleted.
</para>
<para> </refsection>
The roots of the garbage collector are the store expressions
mentioned in the files in the directory
<filename><replaceable>prefix</replaceable>/var/nix/gcroots</filename>.
By default, the roots are all user environments in
<filename><replaceable>prefix</replaceable>/var/nix/profiles</filename>.
You can register other store expressions as roots by writing the
full path of the store expression to an arbitrary file in the
<filename>gcroots</filename> directory (or a subdirectory
thereof).
</para>
</refsection>
<refsection>
<title>Options</title>
<variablelist>
<varlistentry>
<term><option>--print-live</option> / <option>--print-dead</option></term>
<listitem>
<para>
These options cause the set of live or dead paths to be
printed, respectively, rather than performing an actual
garbage collector. They correspond exactly with the
sub-operations in <command>nix-store
<option>--gc</option></command>.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Examples</title>
<para>
To delete all unreachable paths, just do:
<screen>
$ nix-collect-garbage</screen>
</para>
</refsection>
</refentry> </refentry>

192
doc/manual/nix-store.xml
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@ -146,126 +146,121 @@ output.</para>
<!--######################################################################--> <!--######################################################################-->
<refsection> <refsection id='rsec-nix-store-gc'><title>Operation <option>--gc</option></title>
<title>Operation <option>--gc</option></title>
<refsection> <refsection><title>Synopsis</title>
<title>Synopsis</title>
<cmdsynopsis>
<command>nix-store</command>
<arg choice='plain'><option>--gc</option></arg>
<group choice='req'>
<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>--min-age</option> <replaceable>age</replaceable></arg>
</cmdsynopsis>
</refsection>
<refsection> <cmdsynopsis>
<title>Description</title> <command>nix-store</command>
<arg choice='plain'><option>--gc</option></arg>
<group choice='req'>
<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>
</cmdsynopsis>
</refsection>
<refsection><title>Description</title>
<para> <para>Without additional flags, the operation <option>--gc</option>
Without additional flags, the operation <option>--gc</option> performs a garbage collection on the Nix store. That is, all paths in
performs a garbage collection on the Nix store. That is, all the Nix store not reachable via file system references from a set of
paths in the Nix store not reachable via file system <quote>roots</quote>, are deleted.</para>
references from a set of <quote>roots</quote>, are deleted.
</para>
<para> <para>The following suboperations may be specified:</para>
The following flags may be specified:
</para>
<variablelist> <variablelist>
<varlistentry> <varlistentry><term><option>--print-roots</option></term>
<term><option>--print-roots</option></term>
<listitem> <listitem><para>This operation prints on standard output the set
<para> of roots used by the garbage collector.</para></listitem>
This operation prints on standard output the set of
roots used by the garbage collector. </varlistentry>
</para>
</listitem>
</varlistentry>
<varlistentry> <varlistentry><term><option>--print-live</option></term>
<term><option>--print-live</option></term>
<listitem> <listitem><para>This operation prints on standard output the set
<para> of <quote>live</quote> store paths, which are all the store paths
This operation prints on standard output the set of reachable from the roots. Live paths should never be deleted,
<quote>live</quote> store paths, which are all the store since that would break consistency — it would become possible that
paths reachable from the roots. Live paths should never applications are installed that reference things that are no
be deleted, since that would break consistency — it longer present in the store.</para></listitem>
would become possible that applications are installed
that reference things that are no longer present in the </varlistentry>
store.
</para>
</listitem>
</varlistentry>
<varlistentry> <varlistentry><term><option>--print-dead</option></term>
<term><option>--print-dead</option></term>
<listitem> <listitem><para>This operation prints out on standard output the
<para> set of <quote>dead</quote> store paths, which is just the opposite
This operation prints out on standard output the set of of the set of live paths: any path in the store that is not live
<quote>dead</quote> store paths, which is just the (with respect to the roots) is dead.</para></listitem>
opposite of the set of live paths: any path in the store
that is not live (with respect to the roots) is dead. </varlistentry>
</para>
</listitem>
</varlistentry>
<varlistentry> <varlistentry><term><option>--delete</option></term>
<term><option>--delete</option></term>
<listitem> <listitem><para>This operation performs an actual garbage
<para> collection. All dead paths are removed from the
This operation performs an actual garbage collection. store. This is the default.</para></listitem>
All dead paths are removed from the store.
</para> </varlistentry>
</listitem>
</varlistentry>
</variablelist> </variablelist>
</refsection> </refsection>
<refsection>
<title>Roots</title>
<para>The roots of the garbage collector are all store paths to
which there are symlinks in the <refsection><title>Roots</title>
directory <filename><replaceable>prefix</replaceable>/nix/var/nix/gcroots</filename>.
For instance, the following command makes the <para>The roots of the garbage collector are all store paths to which
path <filename>/nix/store/d718ef...-foo</filename> a root of there are symlinks in the directory
the collector: <filename><replaceable>prefix</replaceable>/nix/var/nix/gcroots</filename>.
For instance, the following command makes the path
<filename>/nix/store/d718ef...-foo</filename> a root of the collector:
<screen> <screen>
$ ln -s /nix/store/d718ef...-foo /nix/var/nix/gcroots/bar</screen> $ ln -s /nix/store/d718ef...-foo /nix/var/nix/gcroots/bar</screen>
That is, after this command, the garbage collector will not That is, after this command, the garbage collector will not remove
remove <filename>/nix/store/d718ef...-foo</filename> or any of <filename>/nix/store/d718ef...-foo</filename> or any of its
its dependencies.</para> dependencies.</para>
<para>Subdirectories <para>Subdirectories of
of <filename><replaceable>prefix</replaceable>/nix/var/nix/gcroots</filename> <filename><replaceable>prefix</replaceable>/nix/var/nix/gcroots</filename>
are also searched for symlinks. Symlinks to non-store paths are are also searched for symlinks. Symlinks to non-store paths are
followed and searched for roots, but TODO.</para> followed and searched for roots, but TODO.</para>
</refsection> </refsection>
<refsection>
<title>Configuration file</title>
<para>TODO</para> <refsection><title>Configuration file</title>
</refsection> <para>TODO</para>
</refsection> </refsection>
<refsection><title>Examples</title>
<para>To delete all unreachable paths, just do:
<screen>
$ nix-store --gc</screen>
</para>
</refsection>
</refsection>
<!--######################################################################--> <!--######################################################################-->
<refsection> <refsection>
<title>Operation <option>--query</option></title> <title>Operation <option>--query</option></title>
@ -586,10 +581,3 @@ x=`nix-store --query --normalise --force-realise /nix/store/bla.store`
</refentry> </refentry>
<!--
local variables:
sgml-parent-document: ("book.xml" "refentry")
end:
-->

5
doc/manual/style.css
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@ -230,8 +230,3 @@ table.productionset table.productionset
{ {
font-family: monospace; font-family: monospace;
} }
a[href] {
text-decoration: none;
border-bottom: 1px dotted #005aa0;
}