src/systemctl/systemctl-enable.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include "bus-error.h"
   4 #include "bus-locator.h"
   5 #include "locale-util.h"
   6 #include "path-util.h"
   7 #include "systemctl-daemon-reload.h"
   8 #include "systemctl-enable.h"
   9 #include "systemctl-start-unit.h"
  10 #include "systemctl-sysv-compat.h"
  11 #include "systemctl-util.h"
  12 #include "systemctl.h"
  13
  14 static int normalize_filenames(char **names) {
  15         char **u;
  16         int r;
  17
  18         STRV_FOREACH(u, names)
  19                 if (!path_is_absolute(*u)) {
  20                         char* normalized_path;
  21
  22                         if (!isempty(arg_root))
  23                                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
  24                                                        "Non-absolute paths are not allowed when --root is used: %s",
  25                                                        *u);
  26
  27                         if (!strchr(*u,'/'))
  28                                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
  29                                                        "Link argument does contain at least one directory separator: %s",
  30                                                        *u);
  31
  32                         r = path_make_absolute_cwd(*u, &normalized_path);
  33                         if (r < 0)
  34                                 return r;
  35
  36                         free_and_replace(*u, normalized_path);
  37                 }
  38
  39         return 0;
  40 }
  41
  42 static int normalize_names(char **names) {
  43         char **u;
  44         bool was_path = false;
  45
  46         STRV_FOREACH(u, names) {
  47                 int r;
  48
  49                 if (!is_path(*u))
  50                         continue;
  51
  52                 r = free_and_strdup(u, basename(*u));
  53                 if (r < 0)
  54                         return log_error_errno(r, "Failed to normalize unit file path: %m");
  55
  56                 was_path = true;
  57         }
  58
  59         if (was_path)
  60                 log_warning("Warning: Can't execute disable on the unit file path. Proceeding with the unit name.");
  61
  62         return 0;
  63 }
  64
  65 int verb_enable(int argc, char *argv[], void *userdata) {
  66         _cleanup_strv_free_ char **names = NULL;
  67         const char *verb = argv[0];
  68         UnitFileChange *changes = NULL;
  69         size_t n_changes = 0;
  70         int carries_install_info = -1;
  71         bool ignore_carries_install_info = arg_quiet;
  72         int r;
  73
  74         if (!argv[1])
  75                 return 0;
  76
  77         r = mangle_names("to enable", strv_skip(argv, 1), &names);
  78         if (r < 0)
  79                 return r;
  80
  81         r = enable_sysv_units(verb, names);
  82         if (r < 0)
  83                 return r;
  84
  85         /* If the operation was fully executed by the SysV compat, let's finish early */
  86         if (strv_isempty(names)) {
  87                 if (arg_no_reload || install_client_side())
  88                         return 0;
  89
  90                 r = daemon_reload(ACTION_RELOAD, /* graceful= */ false);
  91                 return r > 0 ? 0 : r;
  92         }
  93
  94         if (streq(verb, "disable")) {
  95                 r = normalize_names(names);
  96                 if (r < 0)
  97                         return r;
  98         }
  99
 100         if (streq(verb, "link")) {
 101                 r = normalize_filenames(names);
 102                 if (r < 0)
 103                         return r;
 104         }
 105
 106         if (install_client_side()) {
 107                 UnitFileFlags flags;
 108
 109                 flags = unit_file_flags_from_args();
 110                 if (streq(verb, "enable")) {
 111                         r = unit_file_enable(arg_scope, flags, arg_root, names, &changes, &n_changes);
 112                         carries_install_info = r;
 113                 } else if (streq(verb, "disable"))
 114                         r = unit_file_disable(arg_scope, flags, arg_root, names, &changes, &n_changes);
 115                 else if (streq(verb, "reenable")) {
 116                         r = unit_file_reenable(arg_scope, flags, arg_root, names, &changes, &n_changes);
 117                         carries_install_info = r;
 118                 } else if (streq(verb, "link"))
 119                         r = unit_file_link(arg_scope, flags, arg_root, names, &changes, &n_changes);
 120                 else if (streq(verb, "preset"))
 121                         r = unit_file_preset(arg_scope, flags, arg_root, names, arg_preset_mode, &changes, &n_changes);
 122                 else if (streq(verb, "mask"))
 123                         r = unit_file_mask(arg_scope, flags, arg_root, names, &changes, &n_changes);
 124                 else if (streq(verb, "unmask"))
 125                         r = unit_file_unmask(arg_scope, flags, arg_root, names, &changes, &n_changes);
 126                 else if (streq(verb, "revert"))
 127                         r = unit_file_revert(arg_scope, arg_root, names, &changes, &n_changes);
 128                 else
 129                         assert_not_reached();
 130
 131                 unit_file_dump_changes(r, verb, changes, n_changes, arg_quiet);
 132                 if (r < 0)
 133                         goto finish;
 134                 r = 0;
 135         } else {
 136                 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL, *m = NULL;
 137                 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 138                 bool expect_carries_install_info = false;
 139                 bool send_runtime = true, send_force = true, send_preset_mode = false;
 140                 const char *method;
 141                 sd_bus *bus;
 142
 143                 if (STR_IN_SET(verb, "mask", "unmask")) {
 144                         char **name;
 145                         _cleanup_(lookup_paths_free) LookupPaths lp = {};
 146
 147                         r = lookup_paths_init(&lp, arg_scope, 0, arg_root);
 148                         if (r < 0)
 149                                 return r;
 150
 151                         STRV_FOREACH(name, names) {
 152                                 r = unit_exists(&lp, *name);
 153                                 if (r < 0)
 154                                         return r;
 155                                 if (r == 0)
 156                                         log_notice("Unit %s does not exist, proceeding anyway.", *name);
 157                         }
 158                 }
 159
 160                 r = acquire_bus(BUS_MANAGER, &bus);
 161                 if (r < 0)
 162                         return r;
 163
 164                 polkit_agent_open_maybe();
 165
 166                 if (streq(verb, "enable")) {
 167                         method = "EnableUnitFiles";
 168                         expect_carries_install_info = true;
 169                 } else if (streq(verb, "disable")) {
 170                         method = "DisableUnitFiles";
 171                         send_force = false;
 172                 } else if (streq(verb, "reenable")) {
 173                         method = "ReenableUnitFiles";
 174                         expect_carries_install_info = true;
 175                 } else if (streq(verb, "link"))
 176                         method = "LinkUnitFiles";
 177                 else if (streq(verb, "preset")) {
 178
 179                         if (arg_preset_mode != UNIT_FILE_PRESET_FULL) {
 180                                 method = "PresetUnitFilesWithMode";
 181                                 send_preset_mode = true;
 182                         } else
 183                                 method = "PresetUnitFiles";
 184
 185                         expect_carries_install_info = true;
 186                         ignore_carries_install_info = true;
 187                 } else if (streq(verb, "mask"))
 188                         method = "MaskUnitFiles";
 189                 else if (streq(verb, "unmask")) {
 190                         method = "UnmaskUnitFiles";
 191                         send_force = false;
 192                 } else if (streq(verb, "revert")) {
 193                         method = "RevertUnitFiles";
 194                         send_runtime = send_force = false;
 195                 } else
 196                         assert_not_reached();
 197
 198                 r = bus_message_new_method_call(bus, &m, bus_systemd_mgr, method);
 199                 if (r < 0)
 200                         return bus_log_create_error(r);
 201
 202                 r = sd_bus_message_append_strv(m, names);
 203                 if (r < 0)
 204                         return bus_log_create_error(r);
 205
 206                 if (send_preset_mode) {
 207                         r = sd_bus_message_append(m, "s", unit_file_preset_mode_to_string(arg_preset_mode));
 208                         if (r < 0)
 209                                 return bus_log_create_error(r);
 210                 }
 211
 212                 if (send_runtime) {
 213                         r = sd_bus_message_append(m, "b", arg_runtime);
 214                         if (r < 0)
 215                                 return bus_log_create_error(r);
 216                 }
 217
 218                 if (send_force) {
 219                         r = sd_bus_message_append(m, "b", arg_force);
 220                         if (r < 0)
 221                                 return bus_log_create_error(r);
 222                 }
 223
 224                 r = sd_bus_call(bus, m, 0, &error, &reply);
 225                 if (r < 0)
 226                         return log_error_errno(r, "Failed to %s unit: %s", verb, bus_error_message(&error, r));
 227
 228                 if (expect_carries_install_info) {
 229                         r = sd_bus_message_read(reply, "b", &carries_install_info);
 230                         if (r < 0)
 231                                 return bus_log_parse_error(r);
 232                 }
 233
 234                 r = bus_deserialize_and_dump_unit_file_changes(reply, arg_quiet, &changes, &n_changes);
 235                 if (r < 0)
 236                         goto finish;
 237
 238                 /* Try to reload if enabled */
 239                 if (!arg_no_reload) {
 240                         r = daemon_reload(ACTION_RELOAD, /* graceful= */ false);
 241                         if (r > 0)
 242                                 r = 0;
 243                 } else
 244                         r = 0;
 245         }
 246
 247         if (carries_install_info == 0 && !ignore_carries_install_info)
 248                 log_notice("The unit files have no installation config (WantedBy=, RequiredBy=, Also=,\n"
 249                            "Alias= settings in the [Install] section, and DefaultInstance= for template\n"
 250                            "units). This means they are not meant to be enabled using systemctl.\n"
 251                            " \n" /* trick: the space is needed so that the line does not get stripped from output */
 252                            "Possible reasons for having this kind of units are:\n"
 253                            "%1$s A unit may be statically enabled by being symlinked from another unit's\n"
 254                            "  .wants/ or .requires/ directory.\n"
 255                            "%1$s A unit's purpose may be to act as a helper for some other unit which has\n"
 256                            "  a requirement dependency on it.\n"
 257                            "%1$s A unit may be started when needed via activation (socket, path, timer,\n"
 258                            "  D-Bus, udev, scripted systemctl call, ...).\n"
 259                            "%1$s In case of template units, the unit is meant to be enabled with some\n"
 260                            "  instance name specified.",
 261                            special_glyph(SPECIAL_GLYPH_BULLET));
 262
 263         if (arg_now && STR_IN_SET(argv[0], "enable", "disable", "mask")) {
 264                 sd_bus *bus;
 265                 size_t len, i;
 266
 267                 r = acquire_bus(BUS_MANAGER, &bus);
 268                 if (r < 0)
 269                         goto finish;
 270
 271                 len = strv_length(names);
 272                 {
 273                         char *new_args[len + 2];
 274
 275                         new_args[0] = (char*) (streq(argv[0], "enable") ? "start" : "stop");
 276                         for (i = 0; i < len; i++)
 277                                 new_args[i + 1] = basename(names[i]);
 278                         new_args[i + 1] = NULL;
 279
 280                         r = verb_start(len + 1, new_args, userdata);
 281                 }
 282         }
 283
 284 finish:
 285         unit_file_changes_free(changes, n_changes);
 286
 287         return r;
 288 }