src/core/dbus-mount.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2010 Lennart Poettering
   6
   7   systemd is free software; you can redistribute it and/or modify it
   8   under the terms of the GNU Lesser General Public License as published by
   9   the Free Software Foundation; either version 2.1 of the License, or
  10   (at your option) any later version.
  11
  12   systemd is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   Lesser General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  19 ***/
  20
  21 #include "bus-util.h"
  22 #include "dbus-cgroup.h"
  23 #include "dbus-execute.h"
  24 #include "dbus-kill.h"
  25 #include "dbus-mount.h"
  26 #include "mount.h"
  27 #include "string-util.h"
  28 #include "unit.h"
  29
  30 static int property_get_what(
  31                 sd_bus *bus,
  32                 const char *path,
  33                 const char *interface,
  34                 const char *property,
  35                 sd_bus_message *reply,
  36                 void *userdata,
  37                 sd_bus_error *error) {
  38
  39         Mount *m = userdata;
  40         const char *d = NULL;
  41
  42         assert(bus);
  43         assert(reply);
  44         assert(m);
  45
  46         if (m->from_proc_self_mountinfo && m->parameters_proc_self_mountinfo.what)
  47                 d = m->parameters_proc_self_mountinfo.what;
  48         else if (m->from_fragment && m->parameters_fragment.what)
  49                 d = m->parameters_fragment.what;
  50
  51         return sd_bus_message_append(reply, "s", d);
  52 }
  53
  54 static int property_get_options(
  55                 sd_bus *bus,
  56                 const char *path,
  57                 const char *interface,
  58                 const char *property,
  59                 sd_bus_message *reply,
  60                 void *userdata,
  61                 sd_bus_error *error) {
  62
  63         Mount *m = userdata;
  64         const char *d = NULL;
  65
  66         assert(bus);
  67         assert(reply);
  68         assert(m);
  69
  70         if (m->from_proc_self_mountinfo && m->parameters_proc_self_mountinfo.options)
  71                 d = m->parameters_proc_self_mountinfo.options;
  72         else if (m->from_fragment && m->parameters_fragment.options)
  73                 d = m->parameters_fragment.options;
  74
  75         return sd_bus_message_append(reply, "s", d);
  76 }
  77
  78 static int property_get_type(
  79                 sd_bus *bus,
  80                 const char *path,
  81                 const char *interface,
  82                 const char *property,
  83                 sd_bus_message *reply,
  84                 void *userdata,
  85                 sd_bus_error *error) {
  86
  87         const char *fstype = NULL;
  88         Mount *m = userdata;
  89
  90         assert(bus);
  91         assert(reply);
  92         assert(m);
  93
  94         if (m->from_proc_self_mountinfo && m->parameters_proc_self_mountinfo.fstype)
  95                 fstype = m->parameters_proc_self_mountinfo.fstype;
  96         else if (m->from_fragment && m->parameters_fragment.fstype)
  97                 fstype = m->parameters_fragment.fstype;
  98
  99         return sd_bus_message_append(reply, "s", fstype);
 100 }
 101
 102 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_result, mount_result, MountResult);
 103
 104 const sd_bus_vtable bus_mount_vtable[] = {
 105         SD_BUS_VTABLE_START(0),
 106         SD_BUS_PROPERTY("Where", "s", NULL, offsetof(Mount, where), SD_BUS_VTABLE_PROPERTY_CONST),
 107         SD_BUS_PROPERTY("What", "s", property_get_what, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 108         SD_BUS_PROPERTY("Options","s", property_get_options, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 109         SD_BUS_PROPERTY("Type", "s", property_get_type, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 110         SD_BUS_PROPERTY("TimeoutUSec", "t", bus_property_get_usec, offsetof(Mount, timeout_usec), SD_BUS_VTABLE_PROPERTY_CONST),
 111         SD_BUS_PROPERTY("ControlPID", "u", bus_property_get_pid, offsetof(Mount, control_pid), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 112         SD_BUS_PROPERTY("DirectoryMode", "u", bus_property_get_mode, offsetof(Mount, directory_mode), SD_BUS_VTABLE_PROPERTY_CONST),
 113         SD_BUS_PROPERTY("SloppyOptions", "b", bus_property_get_bool, offsetof(Mount, sloppy_options), SD_BUS_VTABLE_PROPERTY_CONST),
 114         SD_BUS_PROPERTY("LazyUnmount", "b", bus_property_get_bool, offsetof(Mount, lazy_unmount), SD_BUS_VTABLE_PROPERTY_CONST),
 115         SD_BUS_PROPERTY("ForceUnmount", "b", bus_property_get_bool, offsetof(Mount, force_unmount), SD_BUS_VTABLE_PROPERTY_CONST),
 116         SD_BUS_PROPERTY("Result", "s", property_get_result, offsetof(Mount, result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 117         SD_BUS_PROPERTY("UID", "u", NULL, offsetof(Unit, ref_uid), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 118         SD_BUS_PROPERTY("GID", "u", NULL, offsetof(Unit, ref_gid), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 119         BUS_EXEC_COMMAND_VTABLE("ExecMount", offsetof(Mount, exec_command[MOUNT_EXEC_MOUNT]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
 120         BUS_EXEC_COMMAND_VTABLE("ExecUnmount", offsetof(Mount, exec_command[MOUNT_EXEC_UNMOUNT]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
 121         BUS_EXEC_COMMAND_VTABLE("ExecRemount", offsetof(Mount, exec_command[MOUNT_EXEC_REMOUNT]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
 122         SD_BUS_VTABLE_END
 123 };
 124
 125 static int bus_mount_set_transient_property(
 126                 Mount *m,
 127                 const char *name,
 128                 sd_bus_message *message,
 129                 UnitSetPropertiesMode mode,
 130                 sd_bus_error *error) {
 131
 132         const char *new_property;
 133         char **property;
 134         char *p;
 135         int r;
 136
 137         assert(m);
 138         assert(name);
 139         assert(message);
 140
 141         if (streq(name, "What"))
 142                 property = &m->parameters_fragment.what;
 143         else if (streq(name, "Options"))
 144                 property = &m->parameters_fragment.options;
 145         else if (streq(name, "Type"))
 146                 property = &m->parameters_fragment.fstype;
 147         else
 148                 return 0;
 149
 150         r = sd_bus_message_read(message, "s", &new_property);
 151         if (r < 0)
 152                 return r;
 153
 154         if (mode != UNIT_CHECK) {
 155                 p = strdup(new_property);
 156                 if (!p)
 157                         return -ENOMEM;
 158
 159                 unit_write_drop_in_format(UNIT(m), mode, name, "[Mount]\n%s=%s\n",
 160                         name, new_property);
 161
 162                 free(*property);
 163                 *property = p;
 164         }
 165
 166         return 1;
 167 }
 168
 169 int bus_mount_set_property(
 170                 Unit *u,
 171                 const char *name,
 172                 sd_bus_message *message,
 173                 UnitSetPropertiesMode mode,
 174                 sd_bus_error *error) {
 175
 176         Mount *m = MOUNT(u);
 177         int r;
 178
 179         assert(m);
 180         assert(name);
 181         assert(message);
 182
 183         r = bus_cgroup_set_property(u, &m->cgroup_context, name, message, mode, error);
 184         if (r != 0)
 185                 return r;
 186
 187         if (u->transient && u->load_state == UNIT_STUB) {
 188                 /* This is a transient unit, let's load a little more */
 189
 190                 r = bus_mount_set_transient_property(m, name, message, mode, error);
 191                 if (r != 0)
 192                         return r;
 193
 194                 r = bus_exec_context_set_transient_property(u, &m->exec_context, name, message, mode, error);
 195                 if (r != 0)
 196                         return r;
 197
 198                 r = bus_kill_context_set_transient_property(u, &m->kill_context, name, message, mode, error);
 199                 if (r != 0)
 200                         return r;
 201         }
 202
 203         return 0;
 204 }
 205
 206 int bus_mount_commit_properties(Unit *u) {
 207         assert(u);
 208
 209         unit_update_cgroup_members_masks(u);
 210         unit_realize_cgroup(u);
 211
 212         return 0;
 213 }