diff options
Diffstat (limited to 'src/systemd-system-update-generator')
3 files changed, 181 insertions, 0 deletions
diff --git a/src/systemd-system-update-generator/Makefile b/src/systemd-system-update-generator/Makefile new file mode 100644 index 0000000000..5e66309753 --- /dev/null +++ b/src/systemd-system-update-generator/Makefile @@ -0,0 +1,33 @@ +# -*- Mode: makefile; indent-tabs-mode: t -*- +# +# This file is part of systemd. +# +# Copyright 2010-2012 Lennart Poettering +# Copyright 2010-2012 Kay Sievers +# Copyright 2013 Zbigniew Jędrzejewski-Szmek +# Copyright 2013 David Strauss +# Copyright 2016 Luke Shumaker +# +# 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 $(dir $(lastword $(MAKEFILE_LIST)))/../../config.mk +include $(topsrcdir)/build-aux/Makefile.head.mk + +systemgenerator_PROGRAMS += systemd-system-update-generator +systemd_system_update_generator_SOURCES = \ + src/system-update-generator/system-update-generator.c + +systemd_system_update_generator_LDADD = \ + libsystemd-shared.la + +include $(topsrcdir)/build-aux/Makefile.tail.mk diff --git a/src/systemd-system-update-generator/system-update-generator.c b/src/systemd-system-update-generator/system-update-generator.c new file mode 100644 index 0000000000..e95ab39bb5 --- /dev/null +++ b/src/systemd-system-update-generator/system-update-generator.c @@ -0,0 +1,73 @@ +/*** + This file is part of systemd. + + Copyright 2012 Lennart Poettering + + 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 <errno.h> +#include <unistd.h> + +#include "basic/fs-util.h" +#include "basic/log.h" +#include "basic/string-util.h" +#include "basic/util.h" + +/* + * Implements the logic described in + * http://freedesktop.org/wiki/Software/systemd/SystemUpdates + */ + +static const char *arg_dest = "/tmp"; + +static int generate_symlink(void) { + const char *p = NULL; + + if (laccess("/system-update", F_OK) < 0) { + if (errno == ENOENT) + return 0; + + log_error_errno(errno, "Failed to check for system update: %m"); + return -EINVAL; + } + + p = strjoina(arg_dest, "/default.target"); + if (symlink(SYSTEM_DATA_UNIT_PATH "/system-update.target", p) < 0) + return log_error_errno(errno, "Failed to create symlink %s: %m", p); + + return 0; +} + +int main(int argc, char *argv[]) { + int r; + + if (argc > 1 && argc != 4) { + log_error("This program takes three or no arguments."); + return EXIT_FAILURE; + } + + if (argc > 1) + arg_dest = argv[2]; + + log_set_target(LOG_TARGET_SAFE); + log_parse_environment(); + log_open(); + + umask(0022); + + r = generate_symlink(); + + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; +} diff --git a/src/systemd-system-update-generator/systemd-system-update-generator.xml b/src/systemd-system-update-generator/systemd-system-update-generator.xml new file mode 100644 index 0000000000..833ed79646 --- /dev/null +++ b/src/systemd-system-update-generator/systemd-system-update-generator.xml @@ -0,0 +1,75 @@ +<?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 2012 Lennart Poettering + + 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-system-update-generator"> + + <refentryinfo> + <title>systemd-system-update-generator</title> + <productname>systemd</productname> + + <authorgroup> + <author> + <contrib>Developer</contrib> + <firstname>Lennart</firstname> + <surname>Poettering</surname> + <email>lennart@poettering.net</email> + </author> + </authorgroup> + </refentryinfo> + + <refmeta> + <refentrytitle>systemd-system-update-generator</refentrytitle> + <manvolnum>8</manvolnum> + </refmeta> + + <refnamediv> + <refname>systemd-system-update-generator</refname> + <refpurpose>Generator for redirecting boot to offline update mode</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <para><filename>/usr/lib/systemd/system-generators/systemd-system-update-generator</filename></para> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><filename>systemd-system-update-generator</filename> is a + generator that automatically redirects the boot process to + <filename>system-update.target</filename>, if + <filename>/system-update</filename> exists. This is required to + implement the logic explained in the + <citerefentry><refentrytitle>systemd.offline-updates</refentrytitle><manvolnum>7</manvolnum></citerefentry>. + </para> + + <para><filename>systemd-system-update-generator</filename> implements + <citerefentry><refentrytitle>systemd.generator</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para> + </refsect1> + + <refsect1> + <title>See Also</title> + <para> + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> |