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         int r;
  16
  17         STRV_FOREACH(u, names)
  18                 if (!path_is_absolute(*u)) {
  19                         char* normalized_path;
  20
  21                         if (!isempty(arg_root))
  22                                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
  23                                                        "Non-absolute paths are not allowed when --root is used: %s",
  24                                                        *u);
  25
  26                         if (!strchr(*u, '/'))
  27                                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
  28                                                        "Link argument must contain at least one directory separator.\n"
  29                                                        "If you intended to link a file in the current directory, try ./%s instead.",
  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         bool was_path = false;
  44
  45         STRV_FOREACH(u, names) {
  46                 int r;
  47
  48                 if (!is_path(*u))
  49                         continue;
  50
  51                 r = free_and_strdup(u, basename(*u));
  52                 if (r < 0)
  53                         return log_error_errno(r, "Failed to normalize unit file path: %m");
  54
  55                 was_path = true;
  56         }
  57
  58         if (was_path)
  59                 log_warning("Warning: Can't execute disable on the unit file path. Proceeding with the unit name.");
  60
  61         return 0;
  62 }
  63
  64 int verb_enable(int argc, char *argv[], void *userdata) {
  65         _cleanup_strv_free_ char **names = NULL;
  66         const char *verb = argv[0];
  67         InstallChange *changes = NULL;
  68         size_t n_changes = 0;
  69         int carries_install_info = -1;
  70         bool ignore_carries_install_info = arg_quiet || arg_no_warn;
  71         int r;
  72
  73         if (!argv[1])
  74                 return 0;
  75
  76         r = mangle_names("to enable", strv_skip(argv, 1), &names);
  77         if (r < 0)
  78                 return r;
  79
  80         r = enable_sysv_units(verb, names);
  81         if (r < 0)
  82                 return r;
  83
  84         /* If the operation was fully executed by the SysV compat, let's finish early */
  85         if (strv_isempty(names)) {
  86                 if (arg_no_reload || install_client_side())
  87                         return 0;
  88
  89                 r = daemon_reload(ACTION_RELOAD, /* graceful= */ false);
  90                 return r > 0 ? 0 : r;
  91         }
  92
  93         if (streq(verb, "disable")) {
  94                 r = normalize_names(names);
  95                 if (r < 0)
  96                         return r;
  97         }
  98
  99         if (streq(verb, "link")) {
 100                 r = normalize_filenames(names);
 101                 if (r < 0)
 102                         return r;
 103         }
 104
 105         if (install_client_side()) {
 106                 UnitFileFlags flags;
 107
 108                 flags = unit_file_flags_from_args();
 109                 if (streq(verb, "enable")) {
 110                         r = unit_file_enable(arg_scope, flags, arg_root, names, &changes, &n_changes);
 111                         carries_install_info = r;
 112                 } else if (streq(verb, "disable")) {
 113                         r = unit_file_disable(arg_scope, flags, arg_root, names, &changes, &n_changes);
 114                         carries_install_info = r;
 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                 install_changes_dump(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                         _cleanup_(lookup_paths_free) LookupPaths lp = {};
 145
 146                         r = lookup_paths_init_or_warn(&lp, arg_scope, 0, arg_root);
 147                         if (r < 0)
 148                                 return r;
 149
 150                         STRV_FOREACH(name, names) {
 151                                 r = unit_exists(&lp, *name);
 152                                 if (r < 0)
 153                                         return r;
 154                                 if (r == 0)
 155                                         log_notice("Unit %s does not exist, proceeding anyway.", *name);
 156                         }
 157                 }
 158
 159                 r = acquire_bus(BUS_MANAGER, &bus);
 160                 if (r < 0)
 161                         return r;
 162
 163                 polkit_agent_open_maybe();
 164
 165                 if (streq(verb, "enable")) {
 166                         method = "EnableUnitFiles";
 167                         expect_carries_install_info = true;
 168                 } else if (streq(verb, "disable")) {
 169                         method = "DisableUnitFilesWithFlagsAndInstallInfo";
 170                         expect_carries_install_info = true;
 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                         if (streq(method, "DisableUnitFilesWithFlagsAndInstallInfo"))
 214                                 r = sd_bus_message_append(m, "t", arg_runtime ? UNIT_FILE_RUNTIME : 0);
 215                         else
 216                                 r = sd_bus_message_append(m, "b", arg_runtime);
 217                         if (r < 0)
 218                                 return bus_log_create_error(r);
 219                 }
 220
 221                 if (send_force) {
 222                         r = sd_bus_message_append(m, "b", arg_force);
 223                         if (r < 0)
 224                                 return bus_log_create_error(r);
 225                 }
 226
 227                 r = sd_bus_call(bus, m, 0, &error, &reply);
 228                 if (r < 0)
 229                         return log_error_errno(r, "Failed to %s unit: %s", verb, bus_error_message(&error, r));
 230
 231                 if (expect_carries_install_info) {
 232                         r = sd_bus_message_read(reply, "b", &carries_install_info);
 233                         if (r < 0)
 234                                 return bus_log_parse_error(r);
 235                 }
 236
 237                 r = bus_deserialize_and_dump_unit_file_changes(reply, arg_quiet, &changes, &n_changes);
 238                 if (r < 0)
 239                         goto finish;
 240
 241                 /* Try to reload if enabled */
 242                 if (!arg_no_reload) {
 243                         r = daemon_reload(ACTION_RELOAD, /* graceful= */ false);
 244                         if (r > 0)
 245                                 r = 0;
 246                 } else
 247                         r = 0;
 248         }
 249
 250         if (carries_install_info == 0 && !ignore_carries_install_info)
 251                 log_notice("The unit files have no installation config (WantedBy=, RequiredBy=, Also=,\n"
 252                            "Alias= settings in the [Install] section, and DefaultInstance= for template\n"
 253                            "units). This means they are not meant to be enabled or disabled using systemctl.\n"
 254                            " \n" /* trick: the space is needed so that the line does not get stripped from output */
 255                            "Possible reasons for having this kind of units are:\n"
 256                            "%1$s A unit may be statically enabled by being symlinked from another unit's\n"
 257                            "  .wants/ or .requires/ directory.\n"
 258                            "%1$s A unit's purpose may be to act as a helper for some other unit which has\n"
 259                            "  a requirement dependency on it.\n"
 260                            "%1$s A unit may be started when needed via activation (socket, path, timer,\n"
 261                            "  D-Bus, udev, scripted systemctl call, ...).\n"
 262                            "%1$s In case of template units, the unit is meant to be enabled with some\n"
 263                            "  instance name specified.",
 264                            special_glyph(SPECIAL_GLYPH_BULLET));
 265
 266         if (arg_now && STR_IN_SET(argv[0], "enable", "disable", "mask")) {
 267                 sd_bus *bus;
 268                 size_t len, i;
 269
 270                 r = acquire_bus(BUS_MANAGER, &bus);
 271                 if (r < 0)
 272                         goto finish;
 273
 274                 len = strv_length(names);
 275                 {
 276                         char *new_args[len + 2];
 277
 278                         new_args[0] = (char*) (streq(argv[0], "enable") ? "start" : "stop");
 279                         for (i = 0; i < len; i++)
 280                                 new_args[i + 1] = basename(names[i]);
 281                         new_args[i + 1] = NULL;
 282
 283                         r = verb_start(len + 1, new_args, userdata);
 284                 }
 285         }
 286
 287 finish:
 288         install_changes_free(changes, n_changes);
 289
 290         return r;
 291 }