[systemd-devel] [PATCHv4 2/3] resume: add a tool to write a device node's major:minor to /sys/power/resume.
Ivan Shapovalov
intelfx100 at gmail.com
Tue Aug 26 05:11:04 PDT 2014
This can be used to initiate a resume from hibernation by path to a swap
device containing the hibernation image.
The respective templated unit is also added. It is instantiated using
path to the desired resume device.
---
Makefile-man.am | 7 ++++
Makefile.am | 17 +++++++--
man/systemd-resume at .service.xml | 81 ++++++++++++++++++++++++++++++++++++++++
src/resume/Makefile | 1 +
src/resume/resume.c | 81 ++++++++++++++++++++++++++++++++++++++++
units/systemd-resume at .service.in | 20 ++++++++++
6 files changed, 204 insertions(+), 3 deletions(-)
create mode 100644 man/systemd-resume at .service.xml
create mode 120000 src/resume/Makefile
create mode 100644 src/resume/resume.c
create mode 100644 units/systemd-resume at .service.in
diff --git a/Makefile-man.am b/Makefile-man.am
index 5c289dd..be19905 100644
--- a/Makefile-man.am
+++ b/Makefile-man.am
@@ -76,6 +76,7 @@ MANPAGES += \
man/systemd-nspawn.1 \
man/systemd-path.1 \
man/systemd-remount-fs.service.8 \
+ man/systemd-resume at .service.8 \
man/systemd-run.1 \
man/systemd-shutdownd.service.8 \
man/systemd-sleep.conf.5 \
@@ -206,6 +207,7 @@ MANPAGES_ALIAS += \
man/systemd-poweroff.service.8 \
man/systemd-reboot.service.8 \
man/systemd-remount-fs.8 \
+ man/systemd-resume.8 \
man/systemd-shutdown.8 \
man/systemd-shutdownd.8 \
man/systemd-shutdownd.socket.8 \
@@ -311,6 +313,7 @@ man/systemd-kexec.service.8: man/systemd-halt.service.8
man/systemd-poweroff.service.8: man/systemd-halt.service.8
man/systemd-reboot.service.8: man/systemd-halt.service.8
man/systemd-remount-fs.8: man/systemd-remount-fs.service.8
+man/systemd-resume.8: man/systemd-resume at .service.8
man/systemd-shutdown.8: man/systemd-halt.service.8
man/systemd-shutdownd.8: man/systemd-shutdownd.service.8
man/systemd-shutdownd.socket.8: man/systemd-shutdownd.service.8
@@ -592,6 +595,9 @@ man/systemd-reboot.service.html: man/systemd-halt.service.html
man/systemd-remount-fs.html: man/systemd-remount-fs.service.html
$(html-alias)
+man/systemd-resume.html: man/systemd-resume at .service.html
+ $(html-alias)
+
man/systemd-shutdown.html: man/systemd-halt.service.html
$(html-alias)
@@ -1626,6 +1632,7 @@ EXTRA_DIST += \
man/systemd-readahead-replay.service.xml \
man/systemd-remount-fs.service.xml \
man/systemd-resolved.service.xml \
+ man/systemd-resume at .service.xml \
man/systemd-rfkill at .service.xml \
man/systemd-run.xml \
man/systemd-shutdownd.service.xml \
diff --git a/Makefile.am b/Makefile.am
index e238cde..c4327ca 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -371,7 +371,8 @@ rootlibexec_PROGRAMS = \
systemd-sleep \
systemd-bus-proxyd \
systemd-socket-proxyd \
- systemd-update-done
+ systemd-update-done \
+ systemd-resume
systemgenerator_PROGRAMS = \
systemd-getty-generator \
@@ -509,7 +510,8 @@ nodist_systemunit_DATA = \
units/initrd-udevadm-cleanup-db.service \
units/initrd-switch-root.service \
units/systemd-nspawn at .service \
- units/systemd-update-done.service
+ units/systemd-update-done.service \
+ units/systemd-resume at .service
dist_userunit_DATA = \
units/user/basic.target \
@@ -556,7 +558,8 @@ EXTRA_DIST += \
units/initrd-udevadm-cleanup-db.service.in \
units/initrd-switch-root.service.in \
units/systemd-nspawn at .service.in \
- units/systemd-update-done.service.in
+ units/systemd-update-done.service.in \
+ units/systemd-resume at .service.in
CLEANFILES += \
units/console-shell.service.m4 \
@@ -1930,6 +1933,14 @@ systemd_delta_LDADD = \
libsystemd-shared.la
# ------------------------------------------------------------------------------
+systemd_resume_SOURCES = \
+ src/resume/resume.c
+
+systemd_resume_LDADD = \
+ libsystemd-internal.la \
+ libsystemd-shared.la
+
+# ------------------------------------------------------------------------------
systemd_getty_generator_SOURCES = \
src/getty-generator/getty-generator.c
diff --git a/man/systemd-resume at .service.xml b/man/systemd-resume at .service.xml
new file mode 100644
index 0000000..b7d28fb
--- /dev/null
+++ b/man/systemd-resume at .service.xml
@@ -0,0 +1,81 @@
+<?xml version="1.0"?>
+<!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!--
+ This file is part of systemd.
+
+ Copyright 2014 Ivan Shapovalov
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+<refentry id="systemd-resume at .service">
+
+ <refentryinfo>
+ <title>systemd-resume at .service</title>
+ <productname>systemd</productname>
+
+ <authorgroup>
+ <author>
+ <contrib>Developer</contrib>
+ <firstname>Ivan</firstname>
+ <surname>Shapovalov</surname>
+ <email>intelfx100 at gmail.com</email>
+ </author>
+ </authorgroup>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>systemd-resume at .service</refentrytitle>
+ <manvolnum>8</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>systemd-resume at .service</refname>
+ <refname>systemd-resume</refname>
+ <refpurpose>Resume from hibernation</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <para><filename>systemd-resume at .service</filename></para>
+ <para><filename>/usr/lib/systemd/systemd-resume</filename></para>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><filename>systemd-resume at .service</filename> is a
+ service that initiates hibernation resume from a device
+ containing the resume image. It is instantiated for each
+ device that is configured for resuming from.</para>
+
+ <para><filename>systemd-resume</filename> only supports
+ the in-kernel hibernation implementation, known as swsusp.
+ Internally, it works by writing the major:minor of specified
+ device node to <filename>/sys/power/resume</filename>.</para>
+
+ <para>Failing to initiate a resume is not an error condition.
+ It may mean that there was no resume image (e. g. if the
+ system has been simply powered off and not hibernated). In
+ such case, the boot is ordinarily continued.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd-resume-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>
diff --git a/src/resume/Makefile b/src/resume/Makefile
new file mode 120000
index 0000000..d0b0e8e
--- /dev/null
+++ b/src/resume/Makefile
@@ -0,0 +1 @@
+../Makefile
\ No newline at end of file
diff --git a/src/resume/resume.c b/src/resume/resume.c
new file mode 100644
index 0000000..8f68f81
--- /dev/null
+++ b/src/resume/resume.c
@@ -0,0 +1,81 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2014 Ivan Shapovalov
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdio.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "log.h"
+#include "util.h"
+#include "fileio.h"
+
+int main(int argc, char *argv[]) {
+ struct stat st;
+ const char *device;
+ _cleanup_free_ char *major_minor = NULL;
+ int r;
+
+ if (argc != 2) {
+ log_error("This program expects one argument.");
+ return EXIT_FAILURE;
+ }
+
+ log_set_target(LOG_TARGET_AUTO);
+ log_parse_environment();
+ log_open();
+
+ umask(0022);
+
+ device = argv[1];
+
+ if (stat(device, &st) < 0) {
+ log_error("Failed to stat '%s': %m", device);
+ return EXIT_FAILURE;
+ }
+
+ if (!S_ISBLK(st.st_mode)) {
+ log_error("Resume device '%s' is not a block device.", device);
+ return EXIT_FAILURE;
+ }
+
+ if (asprintf(&major_minor, "%d:%d", major(st.st_rdev), minor(st.st_rdev)) < 0) {
+ log_oom();
+ return EXIT_FAILURE;
+ }
+
+ r = write_string_file("/sys/power/resume", major_minor);
+ if (r < 0) {
+ log_error("Failed to write '%s' to /sys/power/resume: %s", major_minor, strerror(-r));
+ return EXIT_FAILURE;
+ }
+
+ /*
+ * The write above shall not return.
+ *
+ * However, failed resume is a normal condition (may mean that there is
+ * no hibernation image).
+ */
+
+ log_info("Could not resume from '%s' (%s).", device, major_minor);
+ return EXIT_SUCCESS;
+}
diff --git a/units/systemd-resume at .service.in b/units/systemd-resume at .service.in
new file mode 100644
index 0000000..86be7a2
--- /dev/null
+++ b/units/systemd-resume at .service.in
@@ -0,0 +1,20 @@
+# This file is part of systemd.
+#
+# systemd is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+
+[Unit]
+Description=Resume from hibernation using device %f
+Documentation=man:systemd-resume at .service(8)
+DefaultDependencies=no
+BindsTo=%i.device
+Wants=local-fs-pre.target
+After=%i.device
+Before=local-fs-pre.target systemd-remount-fs.service systemd-fsck-root.service
+ConditionPathExists=/etc/initrd-release
+
+[Service]
+Type=oneshot
+ExecStart=@rootlibexecdir@/systemd-resume %f
--
2.1.0
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