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systemctl: warn if trying to disable a unit with no install info

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Trying to disable a unit with no install info is mostly useless, so
adding a warning like we do for enable (with the new dbus method
'DisableUnitFilesWithFlagsAndInstallInfo()'). Note that it would
still find and remove symlinks to the unit in /etc, regardless of
whether it has install info or not, just like before. And if there are
actually files to remove, we suppress the warning.

Fixes #17689
This commit is contained in:
Mike Yuan
2022-12-03 20:26:14 +08:00
parent bef69ae878
commit bf1bea43f1
4 changed files with 55 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/core/dbus-manager.c
+16 -5
View File
@@ -2425,6 +2425,7 @@ static int method_disable_unit_files_generic(
sd_bus_message *message,
Manager *m,
int (*call)(LookupScope scope, UnitFileFlags flags, const char *root_dir, char *files[], InstallChange **changes, size_t *n_changes),
bool carries_install_info,
sd_bus_error *error) {
_cleanup_strv_free_ char **l = NULL;
@@ -2440,7 +2441,8 @@ static int method_disable_unit_files_generic(
if (r < 0)
return r;
if (sd_bus_message_is_method_call(message, NULL, "DisableUnitFilesWithFlags")) {
if (sd_bus_message_is_method_call(message, NULL, "DisableUnitFilesWithFlags") ||
sd_bus_message_is_method_call(message, NULL, "DisableUnitFilesWithFlagsAndInstallInfo")) {
uint64_t raw_flags;
r = sd_bus_message_read(message, "t", &raw_flags);
@@ -2469,19 +2471,23 @@ static int method_disable_unit_files_generic(
if (r < 0)
return install_error(error, r, changes, n_changes);
return reply_install_changes_and_free(m, message, -1, changes, n_changes, error);
return reply_install_changes_and_free(m, message, carries_install_info ? r : -1, changes, n_changes, error);
}
static int method_disable_unit_files_with_flags(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return method_disable_unit_files_generic(message, userdata, unit_file_disable, error);
return method_disable_unit_files_generic(message, userdata, unit_file_disable, /* carries_install_info = */ false, error);
}
static int method_disable_unit_files_with_flags_and_install_info(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return method_disable_unit_files_generic(message, userdata, unit_file_disable, /* carries_install_info = */ true, error);
}
static int method_disable_unit_files(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return method_disable_unit_files_generic(message, userdata, unit_file_disable, error);
return method_disable_unit_files_generic(message, userdata, unit_file_disable, /* carries_install_info = */ false, error);
}
static int method_unmask_unit_files(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return method_disable_unit_files_generic(message, userdata, unit_file_unmask, error);
return method_disable_unit_files_generic(message, userdata, unit_file_unmask, /* carries_install_info = */ false, error);
}
static int method_revert_unit_files(sd_bus_message *message, void *userdata, sd_bus_error *error) {
@@ -3194,6 +3200,11 @@ const sd_bus_vtable bus_manager_vtable[] = {
SD_BUS_RESULT("a(sss)", changes),
method_disable_unit_files_with_flags,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("DisableUnitFilesWithFlagsAndInstallInfo",
SD_BUS_ARGS("as", files, "t", flags),
SD_BUS_RESULT("b", carries_install_info, "a(sss)", changes),
method_disable_unit_files_with_flags_and_install_info,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("ReenableUnitFiles",
SD_BUS_ARGS("as", files, "b", runtime, "b", force),
SD_BUS_RESULT("b", carries_install_info, "a(sss)", changes),
src/shared/install.c
+17 -4
View File
@@ -2790,25 +2790,38 @@ static int do_unit_file_disable(
_cleanup_(install_context_done) InstallContext ctx = { .scope = scope };
_cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
InstallInfo *info;
bool has_install_info = false;
int r;
STRV_FOREACH(name, names) {
if (!unit_name_is_valid(*name, UNIT_NAME_ANY))
return install_changes_add(changes, n_changes, -EUCLEAN, *name, NULL);
r = install_info_add(&ctx, *name, NULL, lp->root_dir, /* auxiliary= */ false, NULL);
r = install_info_add(&ctx, *name, NULL, lp->root_dir, /* auxiliary= */ false, &info);
if (r >= 0)
r = install_info_traverse(&ctx, lp, info, SEARCH_LOAD|SEARCH_FOLLOW_CONFIG_SYMLINKS, NULL);
if (r < 0)
return r;
return install_changes_add(changes, n_changes, r, *name, NULL);
/* If we enable multiple units, some with install info and others without,
* the "empty [Install] section" warning is not shown. Let's make the behavior
* of disable align with that. */
has_install_info = has_install_info || install_info_has_rules(info) || install_info_has_also(info);
}
r = install_context_mark_for_removal(&ctx, lp, &remove_symlinks_to, config_path, changes, n_changes);
if (r >= 0)
r = remove_marked_symlinks(remove_symlinks_to, config_path, lp, flags & UNIT_FILE_DRY_RUN, changes, n_changes);
if (r < 0)
return r;
return remove_marked_symlinks(remove_symlinks_to, config_path, lp, flags & UNIT_FILE_DRY_RUN, changes, n_changes);
/* The warning is shown only if it's a no-op */
return install_changes_have_modification(*changes, *n_changes) || has_install_info;
}
int unit_file_disable(
LookupScope scope,
UnitFileFlags flags,
src/systemctl/systemctl-enable.c
+10 -5
View File
@@ -109,9 +109,10 @@ int verb_enable(int argc, char *argv[], void *userdata) {
if (streq(verb, "enable")) {
r = unit_file_enable(arg_scope, flags, arg_root, names, &changes, &n_changes);
carries_install_info = r;
} else if (streq(verb, "disable"))
} else if (streq(verb, "disable")) {
r = unit_file_disable(arg_scope, flags, arg_root, names, &changes, &n_changes);
else if (streq(verb, "reenable")) {
carries_install_info = r;
} else if (streq(verb, "reenable")) {
r = unit_file_reenable(arg_scope, flags, arg_root, names, &changes, &n_changes);
carries_install_info = r;
} else if (streq(verb, "link"))
@@ -165,7 +166,8 @@ int verb_enable(int argc, char *argv[], void *userdata) {
method = "EnableUnitFiles";
expect_carries_install_info = true;
} else if (streq(verb, "disable")) {
method = "DisableUnitFiles";
method = "DisableUnitFilesWithFlagsAndInstallInfo";
expect_carries_install_info = true;
send_force = false;
} else if (streq(verb, "reenable")) {
method = "ReenableUnitFiles";
@@ -208,7 +210,10 @@ int verb_enable(int argc, char *argv[], void *userdata) {
}
if (send_runtime) {
r = sd_bus_message_append(m, "b", arg_runtime);
if (streq(method, "DisableUnitFilesWithFlagsAndInstallInfo"))
r = sd_bus_message_append(m, "t", arg_runtime ? UNIT_FILE_RUNTIME : 0);
else
r = sd_bus_message_append(m, "b", arg_runtime);
if (r < 0)
return bus_log_create_error(r);
}
@@ -245,7 +250,7 @@ int verb_enable(int argc, char *argv[], void *userdata) {
if (carries_install_info == 0 && !ignore_carries_install_info)
log_notice("The unit files have no installation config (WantedBy=, RequiredBy=, Also=,\n"
"Alias= settings in the [Install] section, and DefaultInstance= for template\n"
"units). This means they are not meant to be enabled using systemctl.\n"
"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 this kind of units are:\n"
"%1$s A unit may be statically enabled by being symlinked from another unit's\n"