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systemd/src/systemctl/systemctl-enable.c
Daan De Meyer 1e35e81b2c tree-wide: Clean up includes 
Preparation for cleaning up includes in src/shared.
2025-05-22 21:10:15 +02:00

412 lines
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "sd-bus.h"
#include "alloc-util.h"
#include "bus-error.h"
#include "bus-locator.h"
#include "bus-unit-util.h"
#include "bus-util.h"
#include "glyph-util.h"
#include "install.h"
#include "log.h"
#include "path-lookup.h"
#include "path-util.h"
#include "string-util.h"
#include "strv-fundamental.h"
#include "strv.h"
#include "systemctl.h"
#include "systemctl-daemon-reload.h"
#include "systemctl-enable.h"
#include "systemctl-start-unit.h"
#include "systemctl-sysv-compat.h"
#include "systemctl-util.h"
#include "unit-name.h"
#include "verbs.h"
static int normalize_link_paths(char **paths) {
int r;
STRV_FOREACH(u, paths) {
if (path_is_absolute(*u))
continue;
if (!isempty(arg_root))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Non-absolute paths are not allowed when --root= is used: %s",
*u);
if (!is_path(*u))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Link argument must contain at least one directory separator.\n"
"If you intended to link a file in the current directory, try './%s' instead.",
*u);
char *normalized_path;
r = path_make_absolute_cwd(*u, &normalized_path);
if (r < 0)
return log_error_errno(r, "Failed to normalize path '%s': %m", *u);
path_simplify(normalized_path);
free_and_replace(*u, normalized_path);
}
return 0;
}
static int normalize_names(char **names) {
bool was_path = false;
int r;
STRV_FOREACH(u, names) {
if (!is_path(*u))
continue;
char *fn;
r = path_extract_filename(*u, &fn);
if (r < 0)
return log_error_errno(r, "Failed to extract file name from '%s': %m", *u);
free_and_replace(*u, fn);
was_path = true;
}
if (was_path)
log_warning("Warning: Can't execute disable on the unit file path. Proceeding with the unit name.");
return 0;
}
int verb_enable(int argc, char *argv[], void *userdata) {
const char *verb = ASSERT_PTR(argv[0]);
_cleanup_strv_free_ char **names = NULL;
int carries_install_info = -1;
bool ignore_carries_install_info = arg_quiet || arg_no_warn;
sd_bus *bus = NULL;
int r;
if (streq(verb, "preset") && should_bypass("SYSTEMD_PRESET"))
return 0;
const char *operation = strjoina("to ", verb);
r = mangle_names(operation, ASSERT_PTR(strv_skip(argv, 1)), &names);
if (r < 0)
return r;
r = enable_sysv_units(verb, names);
if (r < 0)
return r;
/* If the operation was fully executed by the SysV compat, let's finish early */
if (strv_isempty(names)) {
if (arg_no_reload || install_client_side())
return 0;
r = daemon_reload(ACTION_RELOAD, /* graceful= */ false);
return r > 0 ? 0 : r;
}
if (streq(verb, "disable"))
r = normalize_names(names);
else if (streq(verb, "link"))
r = normalize_link_paths(names);
else
r = 0;
if (r < 0)
return r;
if (install_client_side()) {
UnitFileFlags flags;
InstallChange *changes = NULL;
size_t n_changes = 0;
CLEANUP_ARRAY(changes, n_changes, install_changes_free);
flags = unit_file_flags_from_args();
if (streq(verb, "enable")) {
r = unit_file_enable(arg_runtime_scope, flags, arg_root, names, &changes, &n_changes);
carries_install_info = r;
} else if (streq(verb, "disable")) {
r = unit_file_disable(arg_runtime_scope, flags, arg_root, names, &changes, &n_changes);
carries_install_info = r;
} else if (streq(verb, "reenable")) {
r = unit_file_reenable(arg_runtime_scope, flags, arg_root, names, &changes, &n_changes);
carries_install_info = r;
} else if (streq(verb, "link"))
r = unit_file_link(arg_runtime_scope, flags, arg_root, names, &changes, &n_changes);
else if (streq(verb, "preset"))
r = unit_file_preset(arg_runtime_scope, flags, arg_root, names, arg_preset_mode, &changes, &n_changes);
else if (streq(verb, "mask"))
r = unit_file_mask(arg_runtime_scope, flags, arg_root, names, &changes, &n_changes);
else if (streq(verb, "unmask"))
r = unit_file_unmask(arg_runtime_scope, flags, arg_root, names, &changes, &n_changes);
else if (streq(verb, "revert"))
r = unit_file_revert(arg_runtime_scope, arg_root, names, &changes, &n_changes);
else
assert_not_reached();
install_changes_dump(r, verb, changes, n_changes, arg_quiet);
if (r < 0)
return r;
} else {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL, *m = NULL;
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
bool expect_carries_install_info = false;
bool send_runtime = true, send_force = true, send_preset_mode = false;
const char *method, *warn_trigger_operation = NULL;
bool warn_trigger_ignore_masked = true; /* suppress "used uninitialized" warning */
if (STR_IN_SET(verb, "mask", "unmask")) {
_cleanup_(lookup_paths_done) LookupPaths lp = {};
r = lookup_paths_init_or_warn(&lp, arg_runtime_scope, 0, arg_root);
if (r < 0)
return r;
STRV_FOREACH(name, names) {
r = unit_exists(&lp, *name);
if (r < 0)
return r;
if (r == 0)
log_notice("Unit %s does not exist, proceeding anyway.", *name);
}
}
r = acquire_bus(BUS_MANAGER, &bus);
if (r < 0)
return r;
polkit_agent_open_maybe();
if (streq(verb, "enable")) {
method = "EnableUnitFiles";
expect_carries_install_info = true;
} else if (streq(verb, "disable")) {
method = "DisableUnitFilesWithFlagsAndInstallInfo";
expect_carries_install_info = true;
send_force = false;
warn_trigger_operation = "Disabling";
warn_trigger_ignore_masked = true;
} else if (streq(verb, "reenable")) {
method = "ReenableUnitFiles";
expect_carries_install_info = true;
} else if (streq(verb, "link"))
method = "LinkUnitFiles";
else if (streq(verb, "preset")) {
if (arg_preset_mode != UNIT_FILE_PRESET_FULL) {
method = "PresetUnitFilesWithMode";
send_preset_mode = true;
} else
method = "PresetUnitFiles";
expect_carries_install_info = true;
ignore_carries_install_info = true;
} else if (streq(verb, "mask")) {
method = "MaskUnitFiles";
warn_trigger_operation = "Masking";
warn_trigger_ignore_masked = false;
} else if (streq(verb, "unmask")) {
method = "UnmaskUnitFiles";
send_force = false;
} else if (streq(verb, "revert")) {
method = "RevertUnitFiles";
send_runtime = send_force = false;
} else
assert_not_reached();
r = bus_message_new_method_call(bus, &m, bus_systemd_mgr, method);
if (r < 0)
return bus_log_create_error(r);
r = sd_bus_message_append_strv(m, names);
if (r < 0)
return bus_log_create_error(r);
if (send_preset_mode) {
r = sd_bus_message_append(m, "s", unit_file_preset_mode_to_string(arg_preset_mode));
if (r < 0)
return bus_log_create_error(r);
}
if (send_runtime) {
if (streq(method, "DisableUnitFilesWithFlagsAndInstallInfo"))
r = sd_bus_message_append(m, "t", arg_runtime ? (uint64_t) UNIT_FILE_RUNTIME : UINT64_C(0));
else
r = sd_bus_message_append(m, "b", arg_runtime);
if (r < 0)
return bus_log_create_error(r);
}
if (send_force) {
r = sd_bus_message_append(m, "b", arg_force);
if (r < 0)
return bus_log_create_error(r);
}
r = sd_bus_call(bus, m, 0, &error, &reply);
if (r < 0)
return log_error_errno(r, "Failed to %s unit: %s", verb, bus_error_message(&error, r));
if (expect_carries_install_info) {
r = sd_bus_message_read(reply, "b", &carries_install_info);
if (r < 0)
return bus_log_parse_error(r);
}
r = bus_deserialize_and_dump_unit_file_changes(reply, arg_quiet);
if (r < 0)
return r;
/* Try to reload if enabled */
if (!arg_no_reload) {
r = daemon_reload(ACTION_RELOAD, /* graceful= */ false);
if (r < 0)
return r;
}
if (warn_trigger_operation && !arg_quiet && !arg_no_warn)
STRV_FOREACH(unit, names)
warn_triggering_units(bus, *unit, warn_trigger_operation, warn_trigger_ignore_masked);
}
if (carries_install_info == 0 && !ignore_carries_install_info)
log_notice("The unit files have no installation config (WantedBy=, RequiredBy=, UpheldBy=,\n"
"Also=, or Alias= settings in the [Install] section, and DefaultInstance= for\n"
"template units). This means they are not meant to be enabled or disabled using systemctl.\n"
" \n" /* trick: the space is needed so that the line does not get stripped from output */
"Possible reasons for having these kinds of units are:\n"
"%1$s A unit may be statically enabled by being symlinked from another unit's\n"
" .wants/, .requires/, or .upholds/ directory.\n"
"%1$s A unit's purpose may be to act as a helper for some other unit which has\n"
" a requirement dependency on it.\n"
"%1$s A unit may be started when needed via activation (socket, path, timer,\n"
" D-Bus, udev, scripted systemctl call, ...).\n"
"%1$s In case of template units, the unit is meant to be enabled with some\n"
" instance name specified.",
glyph(GLYPH_BULLET));
if (streq(verb, "disable") && arg_runtime_scope == RUNTIME_SCOPE_USER && !arg_quiet && !arg_no_warn) {
/* If some of the units are disabled in user scope but still enabled in global scope,
* we emit a warning for that. */
/* No strv_free here, strings are owned by 'names' */
_cleanup_free_ char **enabled_in_global_scope = NULL;
STRV_FOREACH(name, names) {
UnitFileState state;
r = unit_file_get_state(RUNTIME_SCOPE_GLOBAL, arg_root, *name, &state);
if (r == -ENOENT)
continue;
if (r < 0)
return log_error_errno(r, "Failed to get unit file state for %s: %m", *name);
if (IN_SET(state, UNIT_FILE_ENABLED, UNIT_FILE_ENABLED_RUNTIME)) {
r = strv_push(&enabled_in_global_scope, *name);
if (r < 0)
return log_oom();
}
}
if (!strv_isempty(enabled_in_global_scope)) {
_cleanup_free_ char *joined = NULL;
joined = strv_join(enabled_in_global_scope, ", ");
if (!joined)
return log_oom();
log_notice("The following unit files have been enabled in global scope. This means\n"
"they will still be started automatically after a successful disablement\n"
"in user scope:\n"
"%s",
joined);
}
}
if (arg_now) {
_cleanup_strv_free_ char **new_args = NULL;
const char *start_verb;
bool accept_path, prohibit_templates;
if (streq(verb, "enable")) {
start_verb = "start";
accept_path = true;
prohibit_templates = true;
} else if (STR_IN_SET(verb, "disable", "mask")) {
start_verb = "stop";
accept_path = false;
prohibit_templates = false;
} else if (streq(verb, "reenable")) {
/* Note that we use try-restart here. This matches the semantics of reenable better,
* and allows us to glob template units. */
start_verb = "try-restart";
accept_path = true;
prohibit_templates = false;
} else
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"--now can only be used with verb enable, disable, reenable, or mask.");
if (install_client_side())
return log_error_errno(SYNTHETIC_ERRNO(EREMOTE),
"--now cannot be used when systemd is not running or in conjunction with --root=/--global, refusing.");
assert(bus);
if (strv_extend(&new_args, start_verb) < 0)
return log_oom();
STRV_FOREACH(name, names) {
_cleanup_free_ char *fn = NULL;
const char *unit_name;
if (accept_path) {
/* 'enable' and 'reenable' accept path to unit files, so extract it first. */
r = path_extract_filename(*name, &fn);
if (r < 0)
return log_error_errno(r, "Failed to extract filename of '%s': %m", *name);
unit_name = fn;
} else
unit_name = *name;
if (unit_name_is_valid(unit_name, UNIT_NAME_TEMPLATE)) {
char *globbed;
if (prohibit_templates) {
/* Skip template units when enabling. Globbing doesn't make sense
* since the semantics would be altered (we're operating on
* DefaultInstance= when enabling), and starting template unit
* is not supported anyway. */
log_warning("Template unit is not supported by %s --now, skipping: %s",
verb, unit_name);
continue;
}
assert(!STR_IN_SET(start_verb, "start", "restart"));
r = unit_name_replace_instance_full(unit_name, "*", /* accept_glob = */ true, &globbed);
if (r < 0)
return log_error_errno(r, "Failed to glob unit name '%s': %m", unit_name);
r = strv_consume(&new_args, globbed);
} else
r = strv_extend(&new_args, unit_name);
if (r < 0)
return log_oom();
}
return verb_start(strv_length(new_args), new_args, userdata);
}
return 0;
}
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