remount: add tool that applies /etc/fstab mount options to all api mounts

.gitignore

+systemd-remount-api-vfs
 test-hostname
 systemd-modules-load
 systemd-auto-console-getty

Makefile.am

@@ -74,7 +74,8 @@ rootlibexec_PROGRAMS = \
 	systemd-random-seed \
 	systemd-shutdownd \
 	systemd-auto-console-getty \
-	systemd-modules-load
+	systemd-modules-load \
+	systemd-remount-api-vfs
 
 noinst_PROGRAMS = \
 	test-engine \
@@ -175,6 +176,7 @@ nodist_systemunit_DATA = \
 	units/systemd-shutdownd.service \
 	units/systemd-auto-console-getty.service \
 	units/systemd-modules-load.service \
+	units/systemd-remount-api-vfs.service \
 	units/systemd-update-utmp-runlevel.service \
 	units/systemd-update-utmp-shutdown.service \
 	units/systemd-random-seed-save.service \
@@ -199,6 +201,7 @@ EXTRA_DIST = \
 	units/systemd-shutdownd.service.in \
 	units/systemd-auto-console-getty.service.in \
 	units/systemd-modules-load.service.in \
+	units/systemd-remount-api-vfs.service.in \
 	units/systemd-update-utmp-runlevel.service.in \
 	units/systemd-update-utmp-shutdown.service.in \
 	units/systemd-random-seed-save.service.in \
@@ -586,6 +589,16 @@ systemd_modules_load_CFLAGS = \
 systemd_modules_load_LDADD = \
 	libsystemd-basic.la
 
+systemd_remount_api_vfs_SOURCES = \
+	src/remount-api-vfs.c \
+	src/mount-setup.c
+
+systemd_remount_api_vfs_CFLAGS = \
+	$(AM_CFLAGS)
+
+systemd_remount_api_vfs_LDADD = \
+	libsystemd-basic.la
+
 systemd_cgroups_agent_SOURCES = \
 	src/cgroups-agent.c \
 	src/dbus-common.c

fixme

@@ -42,8 +42,6 @@
 
 * selinux policy loading
 
-* place /etc/inittab with explaining blurb.
-
 * fingerprint.target, wireless.target, gps.target
 
 * set_put(), hashmap_put() return values checken. i.e. == 0 macht kein free()!
@@ -60,10 +58,10 @@
 
 * bash completion a la gdbus
 
-* api mounts gegen fstab mergen und remounten
-
 External:
 
+* place /etc/inittab with explaining blurb.
+
 * procps, psmisc, sysvinit-tools, hostname → util-linux-ng
 
 * nologin nach /var/run https://bugzilla.redhat.com/show_bug.cgi?id=624489

src/hashmap.c

@@ -173,6 +173,15 @@ void hashmap_free(Hashmap*h) {
         free(h);
 }
 
+void hashmap_free_free(Hashmap *h) {
+        void *p;
+
+        while ((p = hashmap_steal_first(h)))
+                free(p);
+
+        hashmap_free(h);
+}
+
 void hashmap_clear(Hashmap *h) {
         if (!h)
                 return;

src/hashmap.h

@@ -47,6 +47,7 @@ int trivial_compare_func(const void *a, const void *b);
 
 Hashmap *hashmap_new(hash_func_t hash_func, compare_func_t compare_func);
 void hashmap_free(Hashmap *h);
+void hashmap_free_free(Hashmap *h);
 Hashmap *hashmap_copy(Hashmap *h);
 int hashmap_ensure_allocated(Hashmap **h, hash_func_t hash_func, compare_func_t compare_func);
 

src/mount-setup.c

@@ -68,11 +68,11 @@ bool mount_point_is_api(const char *path) {
          * should be ignored */
 
         for (i = 0; i < ELEMENTSOF(mount_table); i ++)
-                if (path_startswith(path, mount_table[i].where))
+                if (path_equal(path, mount_table[i].where))
                         return true;
 
         for (i = 0; i < ELEMENTSOF(ignore_paths); i++)
-                if (path_startswith(path, ignore_paths[i]))
+                if (path_equal(path, ignore_paths[i]))
                         return true;
 
         return path_startswith(path, "/cgroup/");

src/remount-api-vfs.c

+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  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 General Public License as published by
+  the Free Software Foundation; either version 2 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
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <mntent.h>
+
+#include "log.h"
+#include "util.h"
+#include "set.h"
+#include "mount-setup.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[]) {
+        int ret = 1;
+        FILE *f = NULL;
+        struct mntent* me;
+        Hashmap *pids = NULL;
+
+        if (argc > 1) {
+                log_error("This program takes no argument.");
+                return 1;
+        }
+
+        log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
+        log_parse_environment();
+        log_open();
+
+        if (!(f = setmntent("/etc/fstab", "r"))) {
+                log_error("Failed to open /etc/fstab: %m");
+                goto finish;
+        }
+
+        if (!(pids = hashmap_new(trivial_hash_func, trivial_compare_func))) {
+                log_error("Failed to allocate set");
+                goto finish;
+        }
+
+        ret = 0;
+
+        while ((me = getmntent(f))) {
+                pid_t pid;
+                int k;
+                char *s;
+
+                if (!mount_point_is_api(me->mnt_dir))
+                        continue;
+
+                log_debug("Remounting %s", me->mnt_dir);
+
+                if ((pid = fork()) < 0) {
+                        log_error("Failed to fork: %m");
+                        ret = 1;
+                        continue;
+                }
+
+                if (pid == 0) {
+                        const char *arguments[5];
+                        /* Child */
+
+                        arguments[0] = "/bin/mount";
+                        arguments[1] = me->mnt_dir;
+                        arguments[2] = "-o";
+                        arguments[3] = "remount";
+                        arguments[4] = NULL;
+
+                        execv("/bin/mount", (char **) arguments);
+
+                        log_error("Failed to execute /bin/mount: %m");
+                        _exit(1);
+                }
+
+                /* Parent */
+
+                s = strdup(me->mnt_dir);
+
+                if ((k = hashmap_put(pids, UINT_TO_PTR(pid), s)) < 0) {
+                        log_error("Failed to add PID to set: %s", strerror(-k));
+                        ret = 1;
+                        continue;
+                }
+        }
+
+        while (!hashmap_isempty(pids)) {
+                siginfo_t si;
+                char *s;
+
+                zero(si);
+                if (waitid(P_ALL, 0, &si, WEXITED) < 0) {
+
+                        if (errno == EINTR)
+                                continue;
+
+                        log_error("waitid() failed: %m");
+                        ret = 1;
+                        break;
+                }
+
+                if ((s = hashmap_remove(pids, UINT_TO_PTR(si.si_pid)))) {
+                        if (!is_clean_exit(si.si_code, si.si_status)) {
+                                if (si.si_code == CLD_EXITED)
+                                        log_error("/bin/mount for %s exited with exit status %i.", s, si.si_status);
+                                else
+                                        log_error("/bin/mount for %s terminated by signal %s.", s, signal_to_string(si.si_status));
+
+                                ret = 1;
+                        }
+
+                        free(s);
+                }
+        }
+
+finish:
+
+        if (pids)
+                hashmap_free_free(pids);
+
+        if (f)
+                endmntent(f);
+
+        return ret;
+}

src/set.c

@@ -38,12 +38,7 @@ void set_free(Set* s) {
 }
 
 void set_free_free(Set *s) {
-        void *p;
-
-        while ((p = set_steal_first(s)))
-                free(p);
-
-        set_free(s);
+        hashmap_free_free(MAKE_HASHMAP(s));
 }
 
 int set_ensure_allocated(Set **s, hash_func_t hash_func, compare_func_t compare_func) {

units/.gitignore

 systemd-modules-load.service
+systemd-remount-api-vfs.service
 systemd-auto-console-getty.service
 systemd-shutdownd.service
 systemd-random-seed-load.service

units/systemd-modules-load.service.in

@@ -13,6 +13,7 @@ Before=shutdown.target
 
 [Service]
 Type=oneshot
+RemainAfterExit=yes
 ExecStart=@rootlibexecdir@/systemd-modules-load
 
 [Install]

units/systemd-remount-api-vfs.service.in

+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 of the License, or
+#  (at your option) any later version.
+
+[Unit]
+Description=Remount API VFS
+DefaultDependencies=no
+Conflicts=shutdown.target
+Before=shutdown.target local-fs.target
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=@rootlibexecdir@/systemd-remount-vfs
+
+[Install]
+WantedBy=sysinit.target