diff options
Diffstat (limited to 'doc/manual/nix-env.xml')
| -rw-r--r-- | doc/manual/nix-env.xml | 204 |
1 files changed, 188 insertions, 16 deletions
diff --git a/doc/manual/nix-env.xml b/doc/manual/nix-env.xml index a0ec489fd..9f73b2d4c 100644 --- a/doc/manual/nix-env.xml +++ b/doc/manual/nix-env.xml @@ -19,6 +19,7 @@ <command>nix-env</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>--arg</option> <replaceable>name</replaceable> <replaceable>value</replaceable></arg> + <arg><option>--argstr</option> <replaceable>name</replaceable> <replaceable>value</replaceable></arg> <arg> <group choice='req'> <arg choice='plain'><option>--file</option></arg> @@ -141,13 +142,33 @@ linkend="sec-common-options" />.</para> <varlistentry><term><filename>~/.nix-defexpr</filename></term> - <!-- !!! .nix-defexpr can be a directory now --> - - <listitem><para>The default Nix expression used by the - <option>--install</option>, <option>--upgrade</option>, and - <option>--query --available</option> operations to obtain - derivations. The <option>--file</option> option may be used to - override this default.</para></listitem> + <listitem><para>A directory that contains the default Nix + expressions used by the <option>--install</option>, + <option>--upgrade</option>, and <option>--query + --available</option> operations to obtain derivations. The + <option>--file</option> option may be used to override this + default.</para> + + <para>The Nix expressions in this directory are combined into a + single attribute set, with each file as an attribute that has the + name of the file. Thus, if <filename>~/.nix-defexpr</filename> + contains two files, <filename>foo</filename> and + <filename>bar</filename>, then the default Nix expression will + essentially be + +<programlisting> +{ + foo = import ~/.nix-defexpr/foo; + bar = import ~/.nix-defexpr/bar; +}</programlisting> + + </para> + + <para>The command <command>nix-channel</command> places symlinks + to the downloaded Nix expressions from each subscribed channel in + this directory.</para> + + </listitem> </varlistentry> @@ -212,11 +233,21 @@ number of possible ways: <para>If there are multiple derivations matching a name in <replaceable>args</replaceable> that have the same name (e.g., <literal>gcc-3.3.6</literal> and <literal>gcc-4.1.1</literal>), then - only the highest version will be installed. You can force the - installation of multiple derivations with the same name by being - specific about the versions. For instance, <literal>nix-env -i - gcc-3.3.6 gcc-4.1.1</literal> will install both version of GCC (and - will probably cause a user environment conflict!).</para></listitem> + the derivation with the highest <emphasis>priority</emphasis> is + used. A derivation can define a priority by declaring the + <varname>meta.priority</varname> attribute. This attribute should + be a number, with a higher value denoting a lower priority. The + default priority is <literal>0</literal>.</para> + + <para>If there are multiple matching derivations with the same + priority, then the derivation with the highest version will be + installed.</para> + + <para>You can force the installation of multiple derivations with + the same name by being specific about the versions. For instance, + <literal>nix-env -i gcc-3.3.6 gcc-4.1.1</literal> will install both + version of GCC (and will probably cause a user environment + conflict!).</para></listitem> <listitem><para>If <link linkend='opt-attr'><option>--attr</option></link> @@ -263,6 +294,15 @@ number of possible ways: <variablelist> + <varlistentry><term><option>--prebuild-only</option> / <option>-b</option></term> + + <listitem><para>Use only derivations for which a substitute is + registered, i.e., there is a pre-built binary available that can + be downloaded in lieu of building the derivation. Thus, no + packages will be built from source.</para></listitem> + + </varlistentry> + <varlistentry><term><option>--preserve-installed</option></term> <term><option>-P</option></term> @@ -378,7 +418,7 @@ the following paths will be substituted: <!--######################################################################--> -<refsection><title>Operation <option>--upgrade</option></title> +<refsection xml:id="rsec-nix-env-upgrade"><title>Operation <option>--upgrade</option></title> <refsection><title>Synopsis</title> @@ -463,6 +503,9 @@ installed.</para> </variablelist> +<para>For the other flags, see <option +linkend="rsec-nix-env-install">--install</option>.</para> + </refsection> <refsection><title>Examples</title> @@ -573,6 +616,111 @@ $ nix-env -e '*' <lineannotation>(remove everything)</lineannotation></screen> <!--######################################################################--> + +<refsection xml:id="rsec-nix-env-set-flag"><title>Operation <option>--set-flag</option></title> + +<refsection><title>Synopsis</title> + +<cmdsynopsis> + <command>nix-env</command> + <arg choice='plain'><option>--set-flag</option></arg> + <arg choice='plain'><replaceable>name</replaceable></arg> + <arg choice='plain'><replaceable>value</replaceable></arg> + <arg choice='plain' rep='repeat'><replaceable>drvnames</replaceable></arg> +</cmdsynopsis> +</refsection> + +<refsection><title>Description</title> + +<para>The <option>--set-flag</option> operation allows meta attributes +of installed packages to be modified. There are several attributes +that can be usefully modified, because they affect the behaviour of +<command>nix-env</command> or the user environment build +script: + +<itemizedlist> + + <listitem><para><varname>priority</varname> can be changed to + resolve filename clashes. The user environment build script uses + the <varname>meta.priority</varname> attribute of derivations to + resolve filename collisions between packages. Lower priority values + denote a higher priority. For instance, the GCC wrapper package and + the Binutils package in Nixpkgs both have a file + <filename>bin/ld</filename>, so previously if you tried to install + both you would get a collision. Now, on the other hand, the GCC + wrapper declares a higher priority than Binutils, so the former’s + <filename>bin/ld</filename> is symlinked in the user + environment.</para></listitem> + + <listitem><para><varname>keep</varname> can be set to + <literal>true</literal> to prevent the package from being upgraded + or replaced. This is useful if you want to hang on to an older + version of a package.</para></listitem> + + <listitem><para><varname>active</varname> can be set to + <literal>false</literal> to “disable” the package. That is, no + symlinks will be generated to the files of the package, but it + remains part of the profile (so it won’t be garbage-collected). It + can be set back to <literal>true</literal> to re-enable the + package.</para></listitem> + +</itemizedlist> + +</para> + +</refsection> + +<refsection><title>Examples</title> + +<para>To prevent the currently installed Firefox from being upgraded: + +<screen> +$ nix-env --set-flag keep true firefox</screen> + +After this, <command>nix-env -u</command> will ignore Firefox.</para> + +<para>To disable the currently installed Firefox, then install a new +Firefox while the old remains part of the profile: + +<screen> +$ nix-env -q \* +firefox-2.0.0.9 <lineannotation>(the current one)</lineannotation> + +$ nix-env --preserve-installed -i firefox-2.0.0.11 +installing `firefox-2.0.0.11' +building path(s) `/nix/store/myy0y59q3ig70dgq37jqwg1j0rsapzsl-user-environment' +Collission between `/nix/store/<replaceable>...</replaceable>-firefox-2.0.0.11/bin/firefox' + and `/nix/store/<replaceable>...</replaceable>-firefox-2.0.0.9/bin/firefox'. +<lineannotation>(i.e., can’t have two active at the same time)</lineannotation> + +$ nix-env --set-flag active false firefox +setting flag on `firefox-2.0.0.9' + +$ nix-env --preserve-installed -i firefox-2.0.0.11 +installing `firefox-2.0.0.11' + +$ nix-env -q \* +firefox-2.0.0.11 <lineannotation>(the enabled one)</lineannotation> +firefox-2.0.0.9 <lineannotation>(the disabled one)</lineannotation></screen> + +</para> + +<para>To make files from <literal>binutils</literal> take precedence +over files from <literal>gcc</literal>: + +<screen> +$ nix-env --set-flag priority 5 binutils +$ nix-env --set-flag priority 10 gcc</screen> + +</para> + +</refsection> + +</refsection> + + + +<!--######################################################################--> <refsection><title>Operation <option>--query</option></title> @@ -598,7 +746,12 @@ $ nix-env -e '*' <lineannotation>(remove everything)</lineannotation></screen> <arg choice='plain'><option>-s</option></arg> </group> </arg> - <arg><option>--attr-path</option></arg> + <arg> + <group choice='req'> + <arg choice='plain'><option>--attr-path</option></arg> + <arg choice='plain'><option>-P</option></arg> + </group> + </arg> <arg><option>--no-name</option></arg> <arg> <group choice='req'> @@ -621,6 +774,7 @@ $ nix-env -e '*' <lineannotation>(remove everything)</lineannotation></screen> <arg choice='plain'><option>-b</option></arg> </group> </arg> + <arg> <group choice='req'> <arg choice='plain'><option>--attr</option></arg> @@ -707,6 +861,16 @@ user environment elements, etc. --> </varlistentry> + <varlistentry><term><option>--prebuild-only</option> / <option>-b</option></term> + + <listitem><para>Show only derivations for which a substitute is + registered, i.e., there is a pre-built binary available that can + be downloaded in lieu of building the derivation. Thus, this + shows all packages that probably can be installed + quickly.</para></listitem> + + </varlistentry> + <varlistentry><term><option>--status</option></term> <term><option>-s</option></term> @@ -726,8 +890,8 @@ user environment elements, etc. --> </varlistentry> - <varlistentry><term><option>--attr</option></term> - <term><option>-a</option></term> + <varlistentry><term><option>--attr-path</option></term> + <term><option>-P</option></term> <listitem><para>Print the <emphasis>attribute path</emphasis> of the derivation, which can be used to unambiguously select it using @@ -819,6 +983,14 @@ user environment elements, etc. --> </varlistentry> + <varlistentry><term><option>--meta</option></term> + + <listitem><para>Print all of the meta-attributes of the + derivation. This option is only available with + <option>--xml</option>.</para></listitem> + + </varlistentry> + </variablelist> </refsection> |