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hibernate-resume-generator: add a generator for instantiating the resume unit.
hibernate-resume-generator understands resume= kernel command line parameter and instantiates the systemd-resume@.service accordingly if it is passed. This enables resume from hibernation using device specified on the kernel command line, and it may be specified either as "/dev/disk/by-foo/bar" or "FOO=bar", not only "/dev/sdXY" which is understood by the in-kernel implementation. So now resume= is brought on par with root= in terms of possible ways to specify a device.
This commit is contained in:
Ivan Shapovalov
Lennart Poettering
parent
42483a7474
commit
d2c68822c4
1
.gitignore
vendored
1
.gitignore
vendored
@ -76,6 +76,7 @@
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/systemd-gnome-ask-password-agent
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/systemd-gpt-auto-generator
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/systemd-hibernate-resume
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/systemd-hibernate-resume-generator
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/systemd-hostnamed
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/systemd-inhibit
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/systemd-initctl
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@ -70,6 +70,7 @@ MANPAGES += \
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man/systemd-getty-generator.8 \
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man/systemd-gpt-auto-generator.8 \
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man/systemd-halt.service.8 \
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man/systemd-hibernate-resume-generator.8 \
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man/systemd-hibernate-resume@.service.8 \
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man/systemd-inhibit.1 \
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man/systemd-initctl.service.8 \
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@ -1625,6 +1626,7 @@ EXTRA_DIST += \
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man/systemd-getty-generator.xml \
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man/systemd-gpt-auto-generator.xml \
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man/systemd-halt.service.xml \
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man/systemd-hibernate-resume-generator.xml \
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man/systemd-hibernate-resume@.service.xml \
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man/systemd-hostnamed.service.xml \
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man/systemd-inhibit.xml \
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11
Makefile.am
11
Makefile.am
@ -385,7 +385,8 @@ systemgenerator_PROGRAMS = \
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systemd-getty-generator \
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systemd-fstab-generator \
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systemd-system-update-generator \
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systemd-debug-generator
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systemd-debug-generator \
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systemd-hibernate-resume-generator
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dist_bashcompletion_DATA = \
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shell-completion/bash/busctl \
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@ -2146,6 +2147,14 @@ systemd_system_update_generator_LDADD = \
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libsystemd-label.la \
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libsystemd-shared.la
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# ------------------------------------------------------------------------------
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systemd_hibernate_resume_generator_SOURCES = \
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src/resume-generator/resume-generator.c
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systemd_hibernate_resume_generator_LDADD = \
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libsystemd-label.la \
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libsystemd-shared.la
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if ENABLE_EFI
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# ------------------------------------------------------------------------------
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systemgenerator_PROGRAMS += \
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@ -351,6 +351,17 @@
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>resume=</varname></term>
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<listitem>
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<para>Enables resume from hibernation
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using the specified device.
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All <citerefentry><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>-like
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pathes are supported. For details, see
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<citerefentry><refentrytitle>systemd-hibernate-resume-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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@ -373,7 +384,8 @@
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<citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-backlight@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-rfkill@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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<citerefentry><refentrytitle>systemd-rfkill@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-hibernate-resume-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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</para>
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</refsect1>
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93
man/systemd-hibernate-resume-generator.xml
Normal file
93
man/systemd-hibernate-resume-generator.xml
Normal file
@ -0,0 +1,93 @@
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<?xml version="1.0"?>
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<!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2014 Ivan Shapovalov
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd-hibernate-resume-generator">
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<refentryinfo>
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<title>systemd-hibernate-resume-generator</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Ivan</firstname>
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<surname>Shapovalov</surname>
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<email>intelfx100@gmail.com</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-hibernate-resume-generator</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-hibernate-resume-generator</refname>
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<refpurpose>Unit generator for resume= kernel parameter</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>/usr/lib/systemd/system-generators/systemd-hibernate-resume-generator</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><filename>systemd-hibernate-resume-generator</filename> is
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a generator that instantiates
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<citerefentry><refentrytitle>systemd-hibernate-resume@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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unit according to the value of <option>resume=</option>
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parameter specified on the kernel command line.</para>
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</refsect1>
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<refsect1>
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<title>Kernel Command Line</title>
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<para><filename>systemd-hibernate-resume-generator</filename> understands
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the following kernel command line parameters:</para>
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<variablelist class='kernel-commandline-options'>
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<varlistentry>
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<term><varname>resume=</varname></term>
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<listitem><para>Takes a path to the resume
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device. Both persistent block device pathes like
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<filename>/dev/disk/by-foo/bar</filename> and
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<citerefentry><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>-style
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specifiers like <literal>FOO=bar</literal>
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are supported.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-hibernate-resume@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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1
src/resume-generator/Makefile
Symbolic link
1
src/resume-generator/Makefile
Symbolic link
@ -0,0 +1 @@
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../Makefile
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95
src/resume-generator/resume-generator.c
Normal file
95
src/resume-generator/resume-generator.c
Normal file
@ -0,0 +1,95 @@
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2014 Ivan Shapovalov
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <stdio.h>
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#include <errno.h>
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#include "log.h"
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#include "util.h"
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#include "special.h"
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#include "mkdir.h"
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#include "unit-name.h"
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static const char *arg_dest = "/tmp";
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static char *arg_resume_dev = NULL;
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static int parse_proc_cmdline_item(const char *key, const char *value) {
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if (streq(key, "resume") && value) {
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free(arg_resume_dev);
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arg_resume_dev = fstab_node_to_udev_node(value);
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if (!arg_resume_dev)
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return log_oom();
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}
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return 0;
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}
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static int process_resume(void) {
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_cleanup_free_ char *name = NULL, *lnk = NULL;
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name = unit_name_from_path_instance("systemd-hibernate-resume", arg_resume_dev, ".service");
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if (!name)
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return log_oom();
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lnk = strjoin(arg_dest, "/" SPECIAL_SYSINIT_TARGET ".wants/", name, NULL);
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if (!lnk)
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return log_oom();
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mkdir_parents_label(lnk, 0755);
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if (symlink(SYSTEM_DATA_UNIT_PATH "/systemd-hibernate-resume@.service", lnk) < 0) {
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log_error("Failed to create symlink %s: %m", lnk);
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return -errno;
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}
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return 0;
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}
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int main(int argc, char *argv[]) {
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int r = 0;
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if (argc > 1 && argc != 4) {
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log_error("This program takes three or no arguments.");
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return EXIT_FAILURE;
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}
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if (argc > 1)
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arg_dest = argv[1];
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log_set_target(LOG_TARGET_SAFE);
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log_parse_environment();
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log_open();
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umask(0022);
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/* Don't even consider resuming outside of initramfs. */
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if (!in_initrd())
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return EXIT_SUCCESS;
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if (parse_proc_cmdline(parse_proc_cmdline_item) < 0)
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return EXIT_FAILURE;
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if (arg_resume_dev != NULL)
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r = process_resume();
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free(arg_resume_dev);
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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