diff options
Diffstat (limited to 'src/systemd-remount-fs')
| -rw-r--r-- | src/systemd-remount-fs/Makefile | 35 | ||||
| -rw-r--r-- | src/systemd-remount-fs/remount-fs.c | 155 | ||||
| -rw-r--r-- | src/systemd-remount-fs/systemd-remount-fs.service.in | 22 | ||||
| -rw-r--r-- | src/systemd-remount-fs/systemd-remount-fs.service.xml | 88 |
4 files changed, 300 insertions, 0 deletions
diff --git a/src/systemd-remount-fs/Makefile b/src/systemd-remount-fs/Makefile new file mode 100644 index 0000000000..55cc776cdb --- /dev/null +++ b/src/systemd-remount-fs/Makefile @@ -0,0 +1,35 @@ +# -*- 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 + +rootlibexec_PROGRAMS += systemd-remount-fs +systemd_remount_fs_SOURCES = \ + src/remount-fs/remount-fs.c \ + src/core/mount-setup.c \ + src/core/mount-setup.h + +systemd_remount_fs_LDADD = \ + libsystemd-shared.la + +include $(topsrcdir)/build-aux/Makefile.tail.mk diff --git a/src/systemd-remount-fs/remount-fs.c b/src/systemd-remount-fs/remount-fs.c new file mode 100644 index 0000000000..d7dac1c1e6 --- /dev/null +++ b/src/systemd-remount-fs/remount-fs.c @@ -0,0 +1,155 @@ +/*** + This file is part of systemd. + + Copyright 2010 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 <mntent.h> +#include <string.h> +#include <sys/prctl.h> +#include <sys/stat.h> +#include <sys/wait.h> +#include <unistd.h> + +#include "core/mount-setup.h" +#include "systemd-basic/exit-status.h" +#include "systemd-basic/log.h" +#include "systemd-basic/mount-util.h" +#include "systemd-basic/path-util.h" +#include "systemd-basic/process-util.h" +#include "systemd-basic/signal-util.h" +#include "systemd-basic/strv.h" +#include "systemd-basic/util.h" + +/* Goes through /etc/fstab and remounts all API file systems, applying + * options that are in /etc/fstab that systemd might not have + * respected */ + +int main(int argc, char *argv[]) { + _cleanup_hashmap_free_free_ Hashmap *pids = NULL; + _cleanup_endmntent_ FILE *f = NULL; + struct mntent* me; + int r; + + if (argc > 1) { + log_error("This program takes no argument."); + return EXIT_FAILURE; + } + + log_set_target(LOG_TARGET_AUTO); + log_parse_environment(); + log_open(); + + umask(0022); + + f = setmntent("/etc/fstab", "r"); + if (!f) { + if (errno == ENOENT) { + r = 0; + goto finish; + } + + r = log_error_errno(errno, "Failed to open /etc/fstab: %m"); + goto finish; + } + + pids = hashmap_new(NULL); + if (!pids) { + r = log_oom(); + goto finish; + } + + while ((me = getmntent(f))) { + pid_t pid; + int k; + char *s; + + /* Remount the root fs, /usr and all API VFS */ + if (!mount_point_is_api(me->mnt_dir) && + !path_equal(me->mnt_dir, "/") && + !path_equal(me->mnt_dir, "/usr")) + continue; + + log_debug("Remounting %s", me->mnt_dir); + + pid = fork(); + if (pid < 0) { + r = log_error_errno(errno, "Failed to fork: %m"); + goto finish; + } + + if (pid == 0) { + /* Child */ + + (void) reset_all_signal_handlers(); + (void) reset_signal_mask(); + (void) prctl(PR_SET_PDEATHSIG, SIGTERM); + + execv(MOUNT_PATH, STRV_MAKE(MOUNT_PATH, me->mnt_dir, "-o", "remount")); + + log_error_errno(errno, "Failed to execute " MOUNT_PATH ": %m"); + _exit(EXIT_FAILURE); + } + + /* Parent */ + + s = strdup(me->mnt_dir); + if (!s) { + r = log_oom(); + goto finish; + } + + k = hashmap_put(pids, PID_TO_PTR(pid), s); + if (k < 0) { + free(s); + r = log_oom(); + goto finish; + } + } + + r = 0; + while (!hashmap_isempty(pids)) { + siginfo_t si = {}; + char *s; + + if (waitid(P_ALL, 0, &si, WEXITED) < 0) { + + if (errno == EINTR) + continue; + + r = log_error_errno(errno, "waitid() failed: %m"); + goto finish; + } + + s = hashmap_remove(pids, PID_TO_PTR(si.si_pid)); + if (s) { + if (!is_clean_exit(si.si_code, si.si_status, NULL)) { + if (si.si_code == CLD_EXITED) + log_error(MOUNT_PATH " for %s exited with exit status %i.", s, si.si_status); + else + log_error(MOUNT_PATH " for %s terminated by signal %s.", s, signal_to_string(si.si_status)); + + r = -ENOEXEC; + } + + free(s); + } + } + +finish: + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; +} diff --git a/src/systemd-remount-fs/systemd-remount-fs.service.in b/src/systemd-remount-fs/systemd-remount-fs.service.in new file mode 100644 index 0000000000..8d9daacaa5 --- /dev/null +++ b/src/systemd-remount-fs/systemd-remount-fs.service.in @@ -0,0 +1,22 @@ +# 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=Remount Root and Kernel File Systems +Documentation=man:systemd-remount-fs.service(8) +Documentation=http://www.freedesktop.org/wiki/Software/systemd/APIFileSystems +DefaultDependencies=no +Conflicts=shutdown.target +After=systemd-fsck-root.service +Before=local-fs-pre.target local-fs.target shutdown.target +Wants=local-fs-pre.target +ConditionPathExists=/etc/fstab + +[Service] +Type=oneshot +RemainAfterExit=yes +ExecStart=@rootlibexecdir@/systemd-remount-fs diff --git a/src/systemd-remount-fs/systemd-remount-fs.service.xml b/src/systemd-remount-fs/systemd-remount-fs.service.xml new file mode 100644 index 0000000000..176f2b2d20 --- /dev/null +++ b/src/systemd-remount-fs/systemd-remount-fs.service.xml @@ -0,0 +1,88 @@ +<?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-remount-fs.service"> + + <refentryinfo> + <title>systemd-remount-fs.service</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-remount-fs.service</refentrytitle> + <manvolnum>8</manvolnum> + </refmeta> + + <refnamediv> + <refname>systemd-remount-fs.service</refname> + <refname>systemd-remount-fs</refname> + <refpurpose>Remount root and kernel file systems</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <para><filename>systemd-remount-fs.service</filename></para> + <para><filename>/usr/lib/systemd/systemd-remount-fs</filename></para> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><filename>systemd-remount-fs.service</filename> is an + early boot service that applies mount options listed in + <citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry> + to the root file system, the <filename>/usr</filename> file system, + and the kernel API file systems. This is required so that the + mount options of these file systems — which are pre-mounted by + the kernel, the initial RAM disk, container environments or system + manager code — are updated to those listed in + <filename>/etc/fstab</filename>. This service ignores normal file + systems and only changes the root file system (i.e. + <filename>/</filename>), <filename>/usr</filename> and the virtual + kernel API file systems such as <filename>/proc</filename>, + <filename>/sys</filename> or <filename>/dev</filename>. This + service executes no operation if <filename>/etc/fstab</filename> + does not exist or lists no entries for the mentioned file + systems.</para> + + <para>For a longer discussion of kernel API file systems see + <ulink url="http://www.freedesktop.org/wiki/Software/systemd/APIFileSystems">API + File Systems</ulink>.</para> + </refsect1> + + <refsect1> + <title>See Also</title> + <para> + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry project='man-pages'><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> |