forked from lix-project/lix
929 lines
28 KiB
XML
929 lines
28 KiB
XML
<refentry>
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<refnamediv>
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<refname>nix-env</refname>
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<refpurpose>manipulate or query Nix user environments</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>nix-env</command>
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="opt-common-syn.xml#xpointer(/nop/*)" />
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<arg>
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<group choice='req'>
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<arg choice='plain'><option>--file</option></arg>
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<arg choice='plain'><option>-f</option></arg>
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</group>
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<replaceable>path</replaceable>
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</arg>
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<arg>
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<group choice='req'>
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<arg choice='plain'><option>--profile</option></arg>
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<arg choice='plain'><option>-p</option></arg>
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</group>
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<replaceable>path</replaceable>
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</arg>
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<arg><option>--preserve-installed</option></arg>
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<arg>
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<arg choice='plain'><option>--system-filter</option></arg>
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<replaceable>system</replaceable>
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</arg>
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<arg><option>--dry-run</option></arg>
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<arg><option>--from-expression</option></arg>
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<arg><option>-E</option></arg>
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<arg><option>--from-profile</option> <replaceable>path</replaceable></arg>
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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><title>Description</title>
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<para>The command <command>nix-env</command> is used to manipulate Nix
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user environments. User environments are sets of software components
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available to a user at some point in time. In other words, they are a
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synthesised view of the programs available in the Nix store. There
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may be many user environments: different users can have different
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environments, and individual users can switch between different
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environments.</para>
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<para><command>nix-env</command> takes exactly one
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<emphasis>operation</emphasis> flag which indicates the subcommand to
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be performed. These are documented below.</para>
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</refsection>
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<!--######################################################################-->
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<refsection><title>Common options</title>
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<para>This section lists the options that are common to all
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operations. These options are allowed for every subcommand, though
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they may not always have an effect. See also <xref
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linkend="sec-common-options" />.</para>
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<variablelist>
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<varlistentry><term><option>--file</option></term>
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<term><option>-f</option></term>
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<listitem><para>Specifies the Nix expression (designated below as
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the <emphasis>active Nix expression</emphasis>) used by the
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<option>--install</option>, <option>--upgrade</option>, and
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<option>--query --available</option> operations to obtain
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derivations. The default is
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<filename>~/.nix-defexpr</filename>.</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--profile</option></term>
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<term><option>-p</option></term>
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<listitem><para>Specifies the profile to be used by those
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operations that operate on a profile (designated below as the
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<emphasis>active profile</emphasis>). A profile is sequence of
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user environments called <emphasis>generations</emphasis>, one of
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which is the <emphasis>current generation</emphasis>. The default
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profile is the target of the symbolic link
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<filename>~/.nix-profile</filename> (see below).</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--dry-run</option></term>
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<listitem><para>For the <option>--install</option>,
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<option>--upgrade</option>, <option>--uninstall</option>,
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<option>--switch-generation</option> and
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<option>--rollback</option> operations, this flag will cause
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<command>nix-env</command> to print what
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<emphasis>would</emphasis> be done if this flag had not been
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specified, without actually doing it.</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--preserve-installed</option></term>
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<listitem><para>By default, when you install a derivation with the
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<option>--install</option> operation, it will replace previously
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installed versions with the same derivation name (regardless of
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the version number). This option causes those previously
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installed versions to be kept in the new generation of the
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profile. Note that this will generally cause conflicts in the
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creation of the user environment (since multiple versions of a
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package typically contain the same programs).</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--system-filter</option> <replaceable>system</replaceable></term>
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<listitem><para>By default, operations such as <option>--query
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--available</option> only include derivations matching the current
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platform. This option allows you to use derivations for the
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specified platform <replaceable>system</replaceable>. The special
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value <literal>*</literal> causes derivations for any platform to
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be included.</para></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><title>Files</title>
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<variablelist>
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<varlistentry><term><filename>~/.nix-defexpr</filename></term>
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<listitem><para>The default Nix expression used by the
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<option>--install</option>, <option>--upgrade</option>, and
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<option>--query --available</option> operations to obtain
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derivations. It is generally a symbolic link to some other
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location set using the <option>--import</option> operation. The
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<option>--file</option> option may be used to override this
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default.</para></listitem>
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</varlistentry>
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<varlistentry><term><filename>~/.nix-profile</filename></term>
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<listitem><para>A symbolic link to the user's current profile. By
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default, this symlink points to
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<filename><replaceable>prefix</replaceable>/var/nix/profiles/default</filename>.
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The <envar>PATH</envar> environment variable should include
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<filename>~/.nix-profile/bin</filename> for the user environment
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to be visible to the user.</para></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 id="rsec-nix-env-install"><title>Operation <option>--install</option></title>
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<refsection><title>Synopsis</title>
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<cmdsynopsis>
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<command>nix-env</command>
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<group choice='req'>
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<arg choice='plain'><option>--install</option></arg>
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<arg choice='plain'><option>-i</option></arg>
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</group>
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<group choice='opt'>
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<arg choice='plain'><option>--preserve-installed</option></arg>
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<arg choice='plain'><option>-P</option></arg>
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</group>
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<arg choice='plain' rep='repeat'><replaceable>args</replaceable></arg>
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</cmdsynopsis>
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</refsection>
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<refsection><title>Description</title>
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<para>The install operation creates a new user environment, based on
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the current generation of the active profile, to which a set of store
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paths described by <replaceable>args</replaceable> is added. The
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arguments <replaceable>args</replaceable> map to store paths in a
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number of possible ways:
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<itemizedlist>
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<listitem><para>By default, <replaceable>args</replaceable> is a set
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of derivation names denoting derivations in the active Nix
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expression. These are realised, and the resulting output paths are
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installed. Currently installed derivations with a name equal to the
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name of a derivation being added are removed unless the option
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<option>--preserve-installed</option> is
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specified.</para></listitem>
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<listitem><para>If <option>--from-profile</option>
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<replaceable>path</replaceable> is given,
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<replaceable>args</replaceable> is a set of names denoting installed
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store paths in the profile <replaceable>path</replaceable>. This is
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an easy way to copy user environment elements from one profile to
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another.</para></listitem>
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<listitem><para>If <option>--from-expression</option> is given,
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<replaceable>args</replaceable> are Nix <link
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linkend="ss-functions">functions</link> that are called with the
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active Nix expression as their single argument. The derivations
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returned by those function calls are installed. This allows
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derivations to be specified in a unambiguous way, which is necessary
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if there are multiple derivations with the same
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name.</para></listitem>
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<listitem><para>If <replaceable>args</replaceable> are store
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derivations, then these are <link
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linkend="rsec-nix-store-realise">realised</link>, and the resulting
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output paths are installed.</para></listitem>
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<listitem><para>If <replaceable>args</replaceable> are store paths
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that are not store derivations, then these are <link
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linkend="rsec-nix-store-realise">realised</link> and
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installed.</para></listitem>
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</itemizedlist>
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</para>
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</refsection>
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<refsection><title>Flags</title>
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<variablelist>
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<varlistentry><term><option>--preserve-installed</option></term>
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<term><option>-P</option></term>
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<listitem><para>Do not remove derivations with a name matching one
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of the derivations being installed. Usually, trying to have two
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versions of the same package installed in the same generation of a
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profile will lead to an error in building the generation, due to
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file name clashes between the two versions. However, this is not
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the case for all packages.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsection>
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<refsection><title>Examples</title>
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<para>To install a specific version of <command>gcc</command> from the
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active Nix expression:
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<screen>
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$ nix-env --install gcc-3.3.2
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installing `gcc-3.3.2'
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uninstalling `gcc-3.1'</screen>
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Note the the previously installed version is removed, since
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<option>--preserve-installed</option> was not specified.</para>
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<para>To install an arbitrary version:
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<screen>
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$ nix-env --install gcc
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installing `gcc-3.3.2'</screen>
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</para>
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<para>To install all derivations in the Nix expression <filename>foo.nix</filename>:
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<screen>
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$ nix-env -f ~/foo.nix -i '*'</screen>
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</para>
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<para>To copy the store path with symbolic name <literal>gcc</literal>
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from another profile:
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<screen>
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$ nix-env -i --from-profile /nix/var/nix/profiles/foo -i gcc</screen>
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</para>
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<para>To install a specific store derivation (typically created by
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<command>nix-instantiate</command>):
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<screen>
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$ nix-env -i /nix/store/fibjb1bfbpm5mrsxc4mh2d8n37sxh91i-gcc-3.4.3.drv</screen>
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</para>
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<para>To install a specific output path:
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<screen>
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$ nix-env -i /nix/store/y3cgx0xj1p4iv9x0pnnmdhr8iyg741vk-gcc-3.4.3</screen>
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</para>
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<para>To install from a Nix expression specified on the command-line:
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<screen>
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$ nix-env -f ./foo.nix -i -E \
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'f: (f {system = "i686-linux";}).subversionWithJava'</screen>
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I.e., this evaluates to <literal>(f: (f {system =
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"i686-linux";}).subversionWithJava) (import ./foo.nix)</literal>, thus
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selecting the <literal>subversionWithJava</literal> attribute from the
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attribute set returned by calling the function defined in
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<filename>./foo.nix</filename>.</para>
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</refsection>
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</refsection>
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<!--######################################################################-->
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<refsection><title>Operation <option>--upgrade</option></title>
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<refsection><title>Synopsis</title>
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<cmdsynopsis>
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<command>nix-env</command>
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<group choice='req'>
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<arg choice='plain'><option>--upgrade</option></arg>
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<arg choice='plain'><option>-u</option></arg>
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</group>
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<group choice='opt'>
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<arg choice='plain'><option>--lt</option></arg>
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<arg choice='plain'><option>--leq</option></arg>
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<arg choice='plain'><option>--always</option></arg>
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</group>
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<arg choice='plain' rep='repeat'><replaceable>args</replaceable></arg>
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</cmdsynopsis>
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</refsection>
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<refsection><title>Description</title>
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<para>The upgrade operation creates a new user environment, based on
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the current generation of the active profile, in which all store paths
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are replaced for which there are newer versions in the set of paths
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described by <replaceable>args</replaceable>. Paths for which there
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are no newer versions are left untouched; this is not an error. It is
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also not an error if an element of <replaceable>args</replaceable>
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matches no installed derivations.</para>
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<para>For a description of how <replaceable>args</replaceable> is
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mapped to a set of store paths, see <link
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linkend="rsec-nix-env-install"><option>--install</option></link>. If
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<replaceable>args</replaceable> describes multiple store paths with
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the same symbolic name, only the one with the highest version is
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installed.</para>
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</refsection>
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<refsection><title>Flags</title>
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<variablelist>
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<varlistentry><term><option>--lt</option></term>
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<listitem><para>Only upgrade a derivation to newer versions. This
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is the default.</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--leq</option></term>
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<listitem><para>In addition to upgrading to newer versions, also
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“upgrade” to derivations that have the same version. Version are
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not a unique identification of a derivation, so there may be many
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derivations that have the same version. This flag may be useful
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to force “synchronisation” between the installed and available
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derivations.</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--always</option></term>
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<listitem><para>In addition to upgrading to newer versions, also
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“upgrade” to derivations that have the same or a lower version.
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I.e., derivations may actually be downgraded depending on what is
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available in the active Nix expression.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsection>
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<refsection><title>Examples</title>
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<screen>
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$ nix-env --upgrade gcc
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upgrading `gcc-3.3.1' to `gcc-3.4'
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$ nix-env -u gcc-3.3.2 --always <lineannotation>(switch to a specific version)</lineannotation>
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upgrading `gcc-3.4' to `gcc-3.3.2'
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$ nix-env --upgrade pan
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<lineannotation>(no upgrades available, so nothing happens)</lineannotation>
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$ nix-env -u '*' <lineannotation>(try to upgrade everything)</lineannotation>
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upgrading `hello-2.1.2' to `hello-2.1.3'
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upgrading `mozilla-1.2' to `mozilla-1.4'</screen>
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</refsection>
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<refsection><title>Versions</title>
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<para>The upgrade operation determines whether a derivation
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<varname>y</varname> is an upgrade of a derivation
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<varname>x</varname> by looking at their respective
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<literal>name</literal> attributes. The names (e.g.,
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<literal>gcc-3.3.1</literal> are split into two parts: the package
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name (<literal>gcc</literal>), and the version
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(<literal>3.3.1</literal>). The version part starts after the first
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dash not following by a letter. <varname>x</varname> is considered an
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upgrade of <varname>y</varname> if their package names match, and the
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version of <varname>y</varname> is higher that that of
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<varname>x</varname>.</para>
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<para>The versions are compared by splitting them into contiguous
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components of numbers and letters. E.g., <literal>3.3.1pre5</literal>
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is split into <literal>[3, 3, 1, "pre", 5]</literal>. These lists are
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then compared lexicographically (from left to right). Corresponding
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components <varname>a</varname> and <varname>b</varname> are compared
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as follows. If they are both numbers, integer comparison is used. If
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<varname>a</varname> is an empty string and <varname>b</varname> is a
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number, <varname>a</varname> is considered less than
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<varname>b</varname>. The special string component
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<literal>pre</literal> (for <emphasis>pre-release</emphasis>) is
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considered to be less than other components. String components are
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considered less than number components. Otherwise, they are compared
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lexicographically (i.e., using case-sensitive string comparison).</para>
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<para>This is illustrated by the following examples:
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<screen>
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1.0 < 2.3
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2.1 < 2.3
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2.3 = 2.3
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2.5 > 2.3
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3.1 > 2.3
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2.3.1 > 2.3
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2.3.1 > 2.3a
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2.3pre1 < 2.3
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2.3pre3 < 2.3pre12
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2.3a < 2.3c
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2.3pre1 < 2.3c
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2.3pre1 < 2.3q</screen>
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</para>
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</refsection>
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</refsection>
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<!--######################################################################-->
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<refsection><title>Operation <option>--uninstall</option></title>
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<refsection><title>Synopsis</title>
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|
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<cmdsynopsis>
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<command>nix-env</command>
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<group choice='req'>
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<arg choice='plain'><option>--uninstall</option></arg>
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<arg choice='plain'><option>-e</option></arg>
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</group>
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<arg choice='plain' rep='repeat'><replaceable>drvnames</replaceable></arg>
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</cmdsynopsis>
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</refsection>
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|
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<refsection><title>Description</title>
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|
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<para>The uninstall operation creates a new user environment, based on
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the current generation of the active profile, from which the store
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paths designated by the symbolic names
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<replaceable>names</replaceable> are removed.</para>
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</refsection>
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<refsection><title>Examples</title>
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<screen>
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$ nix-env --uninstall gcc
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$ nix-env -e '*' <lineannotation>(remove everything)</lineannotation></screen>
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</refsection>
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</refsection>
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|
<!--######################################################################-->
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|
|
<refsection><title>Operation <option>--query</option></title>
|
|
|
|
<refsection><title>Synopsis</title>
|
|
|
|
<cmdsynopsis>
|
|
<command>nix-env</command>
|
|
<group choice='req'>
|
|
<arg choice='plain'><option>--query</option></arg>
|
|
<arg choice='plain'><option>-q</option></arg>
|
|
</group>
|
|
<group choice='opt'>
|
|
<arg choice='plain'><option>--installed</option></arg>
|
|
<arg choice='plain'><option>--available</option></arg>
|
|
<arg choice='plain'><option>-a</option></arg>
|
|
</group>
|
|
<group choice='req'>
|
|
<arg choice='plain'><option>--name</option></arg>
|
|
<arg choice='plain'><option>--expr</option></arg>
|
|
<arg choice='plain'><option>--status</option></arg>
|
|
<arg choice='plain'><option>-s</option></arg>
|
|
</group>
|
|
</cmdsynopsis>
|
|
|
|
</refsection>
|
|
|
|
|
|
<refsection><title>Description</title>
|
|
|
|
<para>The query operation displays information about either the store
|
|
paths that are installed in the current generation of the active
|
|
profile (<option>--installed</option>), or the derivations that are
|
|
available for installation in the active Nix expression
|
|
(<option>--available</option>).</para>
|
|
|
|
<para>The derivations are sorted by their <literal>name</literal>
|
|
attributes.</para>
|
|
|
|
</refsection>
|
|
|
|
|
|
<refsection><title>Source selection</title>
|
|
|
|
<para>The following flags specify the set of things on which the query
|
|
operates.</para>
|
|
|
|
<variablelist>
|
|
|
|
<varlistentry><term><option>--installed</option></term>
|
|
|
|
<listitem><para>The query operates on the store paths that are
|
|
installed in the current generation of the active profile. This
|
|
is the default.</para></listitem>
|
|
|
|
</varlistentry>
|
|
|
|
<varlistentry><term><option>--available</option></term>
|
|
<term><option>-a</option></term>
|
|
|
|
<listitem><para>The query operates on the derivations that are
|
|
available in the active Nix expression.</para></listitem>
|
|
|
|
</varlistentry>
|
|
|
|
</variablelist>
|
|
|
|
</refsection>
|
|
|
|
|
|
<refsection><title>Queries</title>
|
|
|
|
<para>The following flags specify what information to display about
|
|
the selected derivations. Multiple flags may be specified, in which
|
|
case the information is shown in the order given here. Note that the
|
|
name of the derivation is shown unless <option>--no-name</option> is
|
|
specified.</para>
|
|
|
|
<!-- TODO: fix the terminology here; i.e., derivations, store paths,
|
|
user environment elements, etc. -->
|
|
|
|
<variablelist>
|
|
|
|
<varlistentry><term><option>--status</option></term>
|
|
<term><option>-s</option></term>
|
|
|
|
<listitem><para>Print the <emphasis>status</emphasis> of the
|
|
derivation. The status consists of three characters. The first
|
|
is <literal>I</literal> or <literal>-</literal>, indicating
|
|
whether the derivation is currently installed in the current
|
|
generation of the active profile. This is by definition the case
|
|
for <option>--installed</option>, but not for
|
|
<option>--available</option>. The second is <literal>P</literal>
|
|
or <literal>-</literal>, indicating whether the derivation is
|
|
present on the system. This indicates whether installation of an
|
|
available derivation will require the derivation to be built. The
|
|
third is <literal>S</literal> or <literal>-</literal>, indicating
|
|
whether a substitute is available for the
|
|
derivation.</para></listitem>
|
|
|
|
</varlistentry>
|
|
|
|
<varlistentry><term><option>--no-name</option></term>
|
|
|
|
<listitem><para>Suppress printing of the <literal>name</literal>
|
|
attribute of each derivation.</para></listitem>
|
|
|
|
</varlistentry>
|
|
|
|
<varlistentry><term><option>--system</option></term>
|
|
|
|
<listitem><para>Print the <literal>system</literal> attribute of
|
|
the derivation.</para></listitem>
|
|
|
|
</varlistentry>
|
|
|
|
<varlistentry><term><option>--drv-path</option></term>
|
|
|
|
<listitem><para>Print the path of the store
|
|
derivation.</para></listitem>
|
|
|
|
</varlistentry>
|
|
|
|
<varlistentry><term><option>--out-path</option></term>
|
|
|
|
<listitem><para>Print the output path of the
|
|
derivation.</para></listitem>
|
|
|
|
</varlistentry>
|
|
|
|
</variablelist>
|
|
|
|
</refsection>
|
|
|
|
|
|
<refsection><title>Examples</title>
|
|
|
|
<screen>
|
|
$ nix-env -q <lineannotation>(show installed derivations)</lineannotation>
|
|
MozillaFirebird-0.7
|
|
bison-1.875c
|
|
docbook-xml-4.2
|
|
...
|
|
|
|
$ nix-env -qa <lineannotation>(show available derivations)</lineannotation>
|
|
GConf-2.4.0.1
|
|
MPlayer-1.0pre3
|
|
MozillaFirebird-0.7
|
|
ORBit2-2.8.3
|
|
...
|
|
|
|
$ nix-env -qas <lineannotation>(show status of available derivations)</lineannotation>
|
|
-P- GConf-2.4.0.1 <lineannotation>(not installed but present)</lineannotation>
|
|
--S MPlayer-1.0pre3 <lineannotation>(not present, but there is a substitute for fast installation)</lineannotation>
|
|
--S MozillaFirebird-0.7 <lineannotation>(i.e., this is not the installed Firebird, even though the version is the same!)</lineannotation>
|
|
IP- bison-1.875c <lineannotation>(installed and by definition present)</lineannotation>
|
|
...
|
|
|
|
$ nix-env -f ./foo.nix -qa <lineannotation>(show available derivations in the Nix expression <filename>foo.nix</filename>)</lineannotation>
|
|
foo-1.2.3</screen>
|
|
|
|
</refsection>
|
|
|
|
</refsection>
|
|
|
|
|
|
|
|
<!--######################################################################-->
|
|
|
|
<refsection><title>Operation <option>--switch-profile</option></title>
|
|
|
|
<refsection><title>Synopsis</title>
|
|
|
|
<cmdsynopsis>
|
|
<command>nix-env</command>
|
|
<group choice='req'>
|
|
<arg choice='plain'><option>--switch-profile</option></arg>
|
|
<arg choice='plain'><option>-S</option></arg>
|
|
</group>
|
|
<arg choice='req'><replaceable>path</replaceable></arg>
|
|
</cmdsynopsis>
|
|
|
|
</refsection>
|
|
|
|
|
|
<refsection><title>Description</title>
|
|
|
|
<para>This operation makes <replaceable>path</replaceable> the current
|
|
profile for the user. That is, the symlink
|
|
<filename>~/.nix-profile</filename> is made to point to
|
|
<replaceable>path</replaceable>.</para>
|
|
|
|
</refsection>
|
|
|
|
<refsection><title>Examples</title>
|
|
|
|
<screen>
|
|
$ nix-env -S ~/my-profile</screen>
|
|
|
|
</refsection>
|
|
|
|
</refsection>
|
|
|
|
|
|
|
|
<!--######################################################################-->
|
|
|
|
<refsection><title>Operation <option>--list-generations</option></title>
|
|
|
|
<refsection><title>Synopsis</title>
|
|
|
|
<cmdsynopsis>
|
|
<command>nix-env</command>
|
|
<arg choice='plain'><option>--list-generations</option></arg>
|
|
</cmdsynopsis>
|
|
|
|
</refsection>
|
|
|
|
|
|
<refsection><title>Description</title>
|
|
|
|
<para>This operation print a list of all the currently existing
|
|
generations for the active profile. These may be switched to using
|
|
the <option>--switch-generation</option> operation. It also prints
|
|
the creation date of the generation, and indicates the current
|
|
generation.</para>
|
|
|
|
</refsection>
|
|
|
|
|
|
<refsection><title>Examples</title>
|
|
|
|
<screen>
|
|
$ nix-env --list-generations
|
|
95 2004-02-06 11:48:24
|
|
96 2004-02-06 11:49:01
|
|
97 2004-02-06 16:22:45
|
|
98 2004-02-06 16:24:33 (current)</screen>
|
|
|
|
</refsection>
|
|
|
|
</refsection>
|
|
|
|
|
|
|
|
<!--######################################################################-->
|
|
|
|
<refsection><title>Operation <option>--delete-generations</option></title>
|
|
|
|
<refsection><title>Synopsis</title>
|
|
|
|
<cmdsynopsis>
|
|
<command>nix-env</command>
|
|
<arg choice='plain'><option>--delete-generations</option></arg>
|
|
<arg choice='plain' rep='repeat'><replaceable>generations</replaceable></arg>
|
|
</cmdsynopsis>
|
|
|
|
</refsection>
|
|
|
|
|
|
<refsection><title>Description</title>
|
|
|
|
<para>This operation deletes the specified generations of the current
|
|
profile. The generations can be a list of generation numbers, or the
|
|
special value <literal>old</literal> to delete all non-current
|
|
generations. Periodically deleting old generations is important to
|
|
make garbage collection effective.</para>
|
|
|
|
</refsection>
|
|
|
|
<refsection><title>Examples</title>
|
|
|
|
<screen>
|
|
$ nix-env --delete-generations 3 4 8
|
|
|
|
$ nix-env -p other_profile --delete-generations old</screen>
|
|
|
|
</refsection>
|
|
|
|
</refsection>
|
|
|
|
|
|
|
|
<!--######################################################################-->
|
|
|
|
<refsection><title>Operation <option>--switch-generation</option></title>
|
|
|
|
<refsection><title>Synopsis</title>
|
|
|
|
<cmdsynopsis>
|
|
<command>nix-env</command>
|
|
<group choice='req'>
|
|
<arg choice='plain'><option>--switch-generation</option></arg>
|
|
<arg choice='plain'><option>-G</option></arg>
|
|
</group>
|
|
<arg choice='req'><replaceable>generation</replaceable></arg>
|
|
</cmdsynopsis>
|
|
|
|
</refsection>
|
|
|
|
|
|
<refsection><title>Description</title>
|
|
|
|
<para>This operation makes generation number
|
|
<replaceable>generation</replaceable> the current generation of the
|
|
active profile. That is, if the
|
|
<filename><replaceable>profile</replaceable></filename> is the path to
|
|
the active profile, then the symlink
|
|
<filename><replaceable>profile</replaceable></filename> is made to
|
|
point to
|
|
<filename><replaceable>profile</replaceable>-<replaceable>generation</replaceable>-link</filename>,
|
|
which is in turn a symlink to the actual user environment in the Nix
|
|
store.</para>
|
|
|
|
<para>Switching will fail if the specified generation does not exist.</para>
|
|
|
|
</refsection>
|
|
|
|
|
|
<refsection><title>Examples</title>
|
|
|
|
<screen>
|
|
$ nix-env -G 42
|
|
switching from generation 50 to 42</screen>
|
|
|
|
</refsection>
|
|
|
|
</refsection>
|
|
|
|
|
|
|
|
<!--######################################################################-->
|
|
|
|
<refsection><title>Operation <option>--rollback</option></title>
|
|
|
|
<refsection><title>Synopsis</title>
|
|
|
|
<cmdsynopsis>
|
|
<command>nix-env</command>
|
|
<arg choice='plain'><option>--rollback</option></arg>
|
|
</cmdsynopsis>
|
|
|
|
</refsection>
|
|
|
|
<refsection><title>Description</title>
|
|
|
|
<para>This operation switches to the “previous” generation of the
|
|
active profile, that is, the highest numbered generation lower than
|
|
the current generation, if it exists. It is just a convenience
|
|
wrapper around <option>--list-generations</option> and
|
|
<option>--switch-generation</option>.</para>
|
|
|
|
</refsection>
|
|
|
|
|
|
<refsection><title>Examples</title>
|
|
|
|
<screen>
|
|
$ nix-env --rollback
|
|
switching from generation 92 to 91
|
|
|
|
$ nix-env --rolback
|
|
error: no generation older than the current (91) exists</screen>
|
|
|
|
</refsection>
|
|
|
|
</refsection>
|
|
|
|
|
|
|
|
<!--######################################################################-->
|
|
|
|
<refsection><title>Operation <option>--import</option></title>
|
|
|
|
<refsection><title>Synopsis</title>
|
|
|
|
<cmdsynopsis>
|
|
<command>nix-env</command>
|
|
<group choice='req'>
|
|
<arg choice='plain'><option>--import</option></arg>
|
|
<arg choice='plain'><option>-I</option></arg>
|
|
</group>
|
|
<arg choice='req'><replaceable>path</replaceable></arg>
|
|
</cmdsynopsis>
|
|
|
|
</refsection>
|
|
|
|
|
|
<refsection><title>Description</title>
|
|
|
|
<para>This operation makes <replaceable>path</replaceable> the default
|
|
active Nix expression for the user. That is, the symlink
|
|
<filename>~/.nix-userenv</filename> is made to point to
|
|
<replaceable>path</replaceable>.</para>
|
|
|
|
</refsection>
|
|
|
|
|
|
<refsection><title>Examples</title>
|
|
|
|
<screen>
|
|
$ nix-env -I ~/nixpkgs-0.5/</screen>
|
|
|
|
</refsection>
|
|
|
|
</refsection>
|
|
|
|
|
|
|
|
</refentry>
|