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Eelco Dolstra 2014-08-04 18:00:33 +02:00
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doc/manual/conf-file.xml
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@ -229,21 +229,21 @@ flag, e.g. <literal>--option gc-keep-outputs false</literal>.</para>
<listitem><para>If set to <literal>true</literal>, builds will be
performed in a <emphasis>chroot environment</emphasis>, i.e., the
build will be isolated from the normal file system hierarchy and
will only see the Nix store, the temporary build directory, and
the directories configured with the <link
linkend='conf-build-chroot-dirs'><literal>build-chroot-dirs</literal>
option</link> (such as <filename>/proc</filename> and
<filename>/dev</filename>). This is useful to prevent undeclared
dependencies on files in directories such as
will only see its dependencies in the Nix store, the temporary
build directory, private versions of <filename>/proc</filename>,
<filename>/dev</filename>, <filename>/dev/shm</filename> and
<filename>/dev/pts</filename>, and the paths configured with the
<link linkend='conf-build-chroot-dirs'><literal>build-chroot-dirs</literal>
option</link>. This is useful to prevent undeclared dependencies
on files in directories such as
<filename>/usr/bin</filename>.</para>
<para>The use of a chroot requires that Nix is run as root (but
you can still use the <link
linkend='conf-build-users-group'>“build users” feature</link> to
perform builds under different users than root). Currently,
chroot builds only work on Linux because Nix uses “bind mounts” to
make the Nix store and other directories available inside the
chroot.</para>
<para>The use of a chroot requires that Nix is run as root (so you
should use the <link linkend='conf-build-users-group'>“build
users” feature</link> to perform the actual builds under different
users than root). Currently, chroot builds only work on Linux
because Nix uses “bind mounts” to make the Nix store and other
directories available inside the chroot.</para>
</listitem>
@ -252,20 +252,28 @@ flag, e.g. <literal>--option gc-keep-outputs false</literal>.</para>
<varlistentry xml:id="conf-build-chroot-dirs"><term><literal>build-chroot-dirs</literal></term>
<listitem><para>When builds are performed in a chroot environment,
Nix will mount some directories from the normal file system
hierarchy inside the chroot. These are the Nix store, the
temporary build directory (usually
<filename>/tmp/nix-build-<replaceable>drvname</replaceable>-<replaceable>number</replaceable></filename>),
the <literal>/proc</literal> filesystem, and the directories
listed here. The default is <literal>/dev /dev/pts</literal>,
since these contain files needed by many builds (such as
<filename>/dev/null</filename>). You can use the syntax
<listitem><para>A list of paths bind-mounted into Nix chroot
environments. Contrary to what the name suggests, the specified
paths do not have to be directories; you can bind-mount other
types of files as well. You can use the syntax
<literal><replaceable>target</replaceable>=<replaceable>source</replaceable></literal>
to mount a path in a different location in the chroot; for
instance, <literal>/bin=/nix-bin</literal> will mount the
directory <literal>/nix-bin</literal> as <literal>/bin</literal>
inside the chroot.</para></listitem>
instance, <literal>/bin=/nix-bin</literal> will mount the path
<literal>/nix-bin</literal> as <literal>/bin</literal> inside the
chroot.</para>
<para>Depending on how Nix was built, the default value for this option
may be empty or provide <filename>/bin/sh</filename> as a
bind-mount of <command>bash</command>.</para></listitem>
</varlistentry>
<varlistentry xml:id="conf-build-extra-chroot-dirs"><term><literal>build-extra-chroot-dirs</literal></term>
<listitem><para>A list of additional paths appended to
<option>build-chroot-dirs</option>. Useful if you want to extend
its default value.</para></listitem>
</varlistentry>