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, bool warn_if_path) {
  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 (warn_if_path && 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 enable_unit(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                 return daemon_reload(argc, argv, userdata);
  90         }
  91
  92         if (streq(verb, "disable")) {
  93                 r = normalize_names(names, true);
  94                 if (r < 0)
  95                         return r;
  96         }
  97
  98         if (streq(verb, "link")) {
  99                 r = normalize_filenames(names);
 100                 if (r < 0)
 101                         return r;
 102         }
 103
 104         if (install_client_side()) {
 105                 UnitFileFlags flags;
 106
 107                 flags = unit_file_flags_from_args();
 108                 if (streq(verb, "enable")) {
 109                         r = unit_file_enable(arg_scope, flags, arg_root, names, &changes, &n_changes);
 110                         carries_install_info = r;
 111                 } else if (streq(verb, "disable"))
 112                         r = unit_file_disable(arg_scope, flags, arg_root, names, &changes, &n_changes);
 113                 else if (streq(verb, "reenable")) {
 114                         r = unit_file_reenable(arg_scope, flags, arg_root, names, &changes, &n_changes);
 115                         carries_install_info = r;
 116                 } else if (streq(verb, "link"))
 117                         r = unit_file_link(arg_scope, flags, arg_root, names, &changes, &n_changes);
 118                 else if (streq(verb, "preset")) {
 119                         r = unit_file_preset(arg_scope, flags, arg_root, names, arg_preset_mode, &changes, &n_changes);
 120                 } else if (streq(verb, "mask"))
 121                         r = unit_file_mask(arg_scope, flags, arg_root, names, &changes, &n_changes);
 122                 else if (streq(verb, "unmask"))
 123                         r = unit_file_unmask(arg_scope, flags, arg_root, names, &changes, &n_changes);
 124                 else if (streq(verb, "revert"))
 125                         r = unit_file_revert(arg_scope, arg_root, names, &changes, &n_changes);
 126                 else
 127                         assert_not_reached("Unknown verb");
 128
 129                 unit_file_dump_changes(r, verb, changes, n_changes, arg_quiet);
 130                 if (r < 0)
 131                         goto finish;
 132                 r = 0;
 133         } else {
 134                 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL, *m = NULL;
 135                 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 136                 bool expect_carries_install_info = false;
 137                 bool send_runtime = true, send_force = true, send_preset_mode = false;
 138                 const char *method;
 139                 sd_bus *bus;
 140
 141                 if (STR_IN_SET(verb, "mask", "unmask")) {
 142                         char **name;
 143                         _cleanup_(lookup_paths_free) LookupPaths lp = {};
 144
 145                         r = lookup_paths_init(&lp, arg_scope, 0, arg_root);
 146                         if (r < 0)
 147                                 return r;
 148
 149                         STRV_FOREACH(name, names) {
 150                                 r = unit_exists(&lp, *name);
 151                                 if (r < 0)
 152                                         return r;
 153                                 if (r == 0)
 154                                         log_notice("Unit %s does not exist, proceeding anyway.", *name);
 155                         }
 156                 }
 157
 158                 r = acquire_bus(BUS_MANAGER, &bus);
 159                 if (r < 0)
 160                         return r;
 161
 162                 polkit_agent_open_maybe();
 163
 164                 if (streq(verb, "enable")) {
 165                         method = "EnableUnitFiles";
 166                         expect_carries_install_info = true;
 167                 } else if (streq(verb, "disable")) {
 168                         method = "DisableUnitFiles";
 169                         send_force = false;
 170                 } else if (streq(verb, "reenable")) {
 171                         method = "ReenableUnitFiles";
 172                         expect_carries_install_info = true;
 173                 } else if (streq(verb, "link"))
 174                         method = "LinkUnitFiles";
 175                 else if (streq(verb, "preset")) {
 176
 177                         if (arg_preset_mode != UNIT_FILE_PRESET_FULL) {
 178                                 method = "PresetUnitFilesWithMode";
 179                                 send_preset_mode = true;
 180                         } else
 181                                 method = "PresetUnitFiles";
 182
 183                         expect_carries_install_info = true;
 184                         ignore_carries_install_info = true;
 185                 } else if (streq(verb, "mask"))
 186                         method = "MaskUnitFiles";
 187                 else if (streq(verb, "unmask")) {
 188                         method = "UnmaskUnitFiles";
 189                         send_force = false;
 190                 } else if (streq(verb, "revert")) {
 191                         method = "RevertUnitFiles";
 192                         send_runtime = send_force = false;
 193                 } else
 194                         assert_not_reached("Unknown verb");
 195
 196                 r = bus_message_new_method_call(bus, &m, bus_systemd_mgr, method);
 197                 if (r < 0)
 198                         return bus_log_create_error(r);
 199
 200                 r = sd_bus_message_append_strv(m, names);
 201                 if (r < 0)
 202                         return bus_log_create_error(r);
 203
 204                 if (send_preset_mode) {
 205                         r = sd_bus_message_append(m, "s", unit_file_preset_mode_to_string(arg_preset_mode));
 206                         if (r < 0)
 207                                 return bus_log_create_error(r);
 208                 }
 209
 210                 if (send_runtime) {
 211                         r = sd_bus_message_append(m, "b", arg_runtime);
 212                         if (r < 0)
 213                                 return bus_log_create_error(r);
 214                 }
 215
 216                 if (send_force) {
 217                         r = sd_bus_message_append(m, "b", arg_force);
 218                         if (r < 0)
 219                                 return bus_log_create_error(r);
 220                 }
 221
 222                 r = sd_bus_call(bus, m, 0, &error, &reply);
 223                 if (r < 0)
 224                         return log_error_errno(r, "Failed to %s unit: %s", verb, bus_error_message(&error, r));
 225
 226                 if (expect_carries_install_info) {
 227                         r = sd_bus_message_read(reply, "b", &carries_install_info);
 228                         if (r < 0)
 229                                 return bus_log_parse_error(r);
 230                 }
 231
 232                 r = bus_deserialize_and_dump_unit_file_changes(reply, arg_quiet, &changes, &n_changes);
 233                 if (r < 0)
 234                         goto finish;
 235
 236                 /* Try to reload if enabled */
 237                 if (!arg_no_reload)
 238                         r = daemon_reload(argc, argv, userdata);
 239                 else
 240                         r = 0;
 241         }
 242
 243         if (carries_install_info == 0 && !ignore_carries_install_info)
 244                 log_notice("The unit files have no installation config (WantedBy=, RequiredBy=, Also=,\n"
 245                            "Alias= settings in the [Install] section, and DefaultInstance= for template\n"
 246                            "units). This means they are not meant to be enabled using systemctl.\n"
 247                            " \n" /* trick: the space is needed so that the line does not get stripped from output */
 248                            "Possible reasons for having this kind of units are:\n"
 249                            "%1$s A unit may be statically enabled by being symlinked from another unit's\n"
 250                            "  .wants/ or .requires/ directory.\n"
 251                            "%1$s A unit's purpose may be to act as a helper for some other unit which has\n"
 252                            "  a requirement dependency on it.\n"
 253                            "%1$s A unit may be started when needed via activation (socket, path, timer,\n"
 254                            "  D-Bus, udev, scripted systemctl call, ...).\n"
 255                            "%1$s In case of template units, the unit is meant to be enabled with some\n"
 256                            "  instance name specified.",
 257                            special_glyph(SPECIAL_GLYPH_BULLET));
 258
 259         if (arg_now && STR_IN_SET(argv[0], "enable", "disable", "mask")) {
 260                 sd_bus *bus;
 261                 size_t len, i;
 262
 263                 r = acquire_bus(BUS_MANAGER, &bus);
 264                 if (r < 0)
 265                         goto finish;
 266
 267                 len = strv_length(names);
 268                 {
 269                         char *new_args[len + 2];
 270
 271                         new_args[0] = (char*) (streq(argv[0], "enable") ? "start" : "stop");
 272                         for (i = 0; i < len; i++)
 273                                 new_args[i + 1] = basename(names[i]);
 274                         new_args[i + 1] = NULL;
 275
 276                         r = start_unit(len + 1, new_args, userdata);
 277                 }
 278         }
 279
 280 finish:
 281         unit_file_changes_free(changes, n_changes);
 282
 283         return r;
 284 }