Add a "nixos-enter" command
This factors out the functionality in nixos-install for running a command inside a NixOS installation (nixos-install --chroot).
This commit is contained in:
Eelco Dolstra
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294a4e6ea5
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<refentry xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refmeta>
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<refentrytitle><command>nixos-enter</command></refentrytitle>
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<manvolnum>8</manvolnum>
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<refmiscinfo class="source">NixOS</refmiscinfo>
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<!-- <refmiscinfo class="version"><xi:include href="version.txt" parse="text"/></refmiscinfo> -->
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</refmeta>
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<refnamediv>
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<refname><command>nixos-enter</command></refname>
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<refpurpose>run a command in a NixOS chroot environment</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>nixos-enter</command>
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<arg>
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<arg choice='plain'><option>--root</option></arg>
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<replaceable>root</replaceable>
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</arg>
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<arg>
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<arg choice='plain'><option>--system</option></arg>
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<replaceable>system</replaceable>
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</arg>
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<arg>
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<arg choice='plain'><option>-c</option></arg>
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<replaceable>shell-command</replaceable>
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</arg>
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<arg>
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<arg choice='plain'><option>--help</option></arg>
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</arg>
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<arg>
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<arg choice='plain'><option>--</option></arg>
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<replaceable>arguments</replaceable>
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</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsection><title>Description</title>
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<para>This command runs a command in a NixOS chroot environment, that
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is, in a filesystem hierarchy previously prepared using
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<command>nixos-install</command>.</para>
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</refsection>
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<refsection><title>Options</title>
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<para>This command accepts the following options:</para>
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<variablelist>
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<varlistentry>
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<term><option>--root</option></term>
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<listitem>
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<para>The path to the NixOS system you want to enter. It defaults to <filename>/mnt</filename>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--system</option></term>
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<listitem>
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<para>The NixOS system configuration to use. It defaults to
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<filename>/nix/var/nix/profiles/system</filename>. You can enter
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a previous NixOS configuration by specifying a path such as
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<filename>/nix/var/nix/profiles/system-106-link</filename>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--command</option></term>
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<term><option>-c</option></term>
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<listitem>
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<para>The bash command to execute.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--</option></term>
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<listitem><para>Interpret the remaining arguments as the program
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name and arguments to be invoked. The program is not executed in a
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shell.</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>Start an interactive shell in the NixOS installation in
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<filename>/mnt</filename>:</para>
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<screen>
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# nixos-enter /mnt
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</screen>
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<para>Run a shell command:</para>
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<screen>
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# nixos-enter -c 'ls -l /; cat /proc/mounts'
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</screen>
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<para>Run a non-shell command:</para>
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<screen>
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# nixos-enter -- cat /proc/mounts
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</screen>
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</refsection>
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</refentry>
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@ -15,7 +15,7 @@
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</author>
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<copyright>
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<year>2007-2015</year>
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<year>2007-2018</year>
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<holder>Eelco Dolstra</holder>
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</copyright>
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@ -25,6 +25,7 @@
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<xi:include href="man-nixos-build-vms.xml" />
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<xi:include href="man-nixos-generate-config.xml" />
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<xi:include href="man-nixos-install.xml" />
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<xi:include href="man-nixos-enter.xml" />
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<xi:include href="man-nixos-option.xml" />
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<xi:include href="man-nixos-rebuild.xml" />
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<xi:include href="man-nixos-version.xml" />
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@ -0,0 +1,58 @@
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#! @shell@
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set -e
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# Re-exec ourselves in a private mount namespace so that our bind
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# mounts get cleaned up automatically.
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if [ "$(id -u)" = 0 ]; then
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if [ -z "$NIXOS_ENTER_REEXEC" ]; then
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export NIXOS_ENTER_REEXEC=1
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exec unshare --mount --uts -- "$0" "$@"
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else
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mount --make-rprivate /
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fi
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fi
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mountPoint=/mnt
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command=("bash" "--login")
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system=/nix/var/nix/profiles/system
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while [ "$#" -gt 0 ]; do
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i="$1"; shift 1
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case "$i" in
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--root)
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mountPoint="$1"; shift 1
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;;
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--system)
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system="$1"; shift 1
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;;
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--help)
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exec man nixos-enter
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exit 1
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;;
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--command|-c)
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command=("bash" "-c" "$1")
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shift 1
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;;
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--)
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command=("$@")
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break
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;;
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*)
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echo "$0: unknown option \`$i'"
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exit 1
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;;
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esac
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done
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# Set up some bind mounts we'll want regardless of chroot or not
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mkdir -m 0755 -p "$mountPoint/dev" "$mountPoint/proc" "$mountPoint/sys" "$mountPoint/run"
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mount --rbind /dev "$mountPoint/dev"
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mount -t proc none "$mountPoint/proc"
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mount -t sysfs none "$mountPoint/sys"
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mount -t tmpfs none "$mountPoint/run"
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# Run the activation script. Set $LOCALE_ARCHIVE to supress some Perl locale warnings.
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LOCALE_ARCHIVE=$system/sw/lib/locale/locale-archive chroot "$mountPoint" "$system/activate" >&2
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exec chroot "$mountPoint" "${command[@]}"
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@ -1,7 +1,9 @@
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# This module generates nixos-install, nixos-rebuild,
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# nixos-generate-config, etc.
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{ config, pkgs, modulesPath, ... }:
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{ config, lib, pkgs, modulesPath, ... }:
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with lib;
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let
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cfg = config.installer;
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@ -69,6 +71,11 @@ let
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inherit (config.system) nixosVersion nixosCodeName nixosRevision;
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};
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nixos-enter = makeProg {
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name = "nixos-enter";
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src = ./nixos-enter.sh;
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};
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in
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{
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nixos-generate-config
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nixos-option
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nixos-version
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nixos-enter
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];
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system.build = {
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inherit nixos-install nixos-prepare-root nixos-generate-config nixos-option nixos-rebuild;
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inherit nixos-install nixos-prepare-root nixos-generate-config nixos-option nixos-rebuild nixos-enter;
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};
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};
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