logind: remove redundant entries from logind's default controller lists too

TODO

@@ -17,8 +17,6 @@ Features:
 
 * suspend/hibernate/hybrid support, auto-suspend logic with idle hint
 
-* filter default cgroups in logind too
-
 * udev: remove /sys and /dev configurability
 
 * udev: find a way to tell udev to not cancel firmware requests when running in initramfs
@@ -286,8 +284,6 @@ Features:
 
 * add systemctl switch to dump transaction without executing it
 
-* suspend, resume support?
-
 * drop cap bounding set in readahead and other services
 
 External:

src/core/cgroup.c

@@ -373,7 +373,7 @@ int manager_setup_cgroup(Manager *m) {
 
         log_debug("Created root group.");
 
-        manager_shorten_default_controllers(m);
+        cg_shorten_controllers(m->default_controllers);
 
 finish:
         free(current);
@@ -397,35 +397,6 @@ void manager_shutdown_cgroup(Manager *m, bool delete) {
         m->cgroup_hierarchy = NULL;
 }
 
-void manager_shorten_default_controllers(Manager *m) {
-        char **f, **t;
-
-        strv_uniq(m->default_controllers);
-
-        if (!m->default_controllers)
-                return;
-
-        for (f = m->default_controllers, t = m->default_controllers; *f; f++) {
-
-                if (!streq(*f, "systemd") && !streq(*f, "name=systemd")) {
-                        char *cc;
-
-                        cc = alloca(sizeof("/sys/fs/cgroup/") + strlen(*f));
-                        strcpy(stpcpy(cc, "/sys/fs/cgroup/"), *f);
-
-                        if (access(cc, F_OK) >= 0) {
-                                *(t++) = *f;
-                                continue;
-                        }
-                }
-
-                log_debug("Controller %s not available or redundant, removing from default controllers list.", *f);
-                free(*f);
-        }
-
-        *t = NULL;
-}
-
 int cgroup_bonding_get(Manager *m, const char *cgroup, CGroupBonding **bonding) {
         CGroupBonding *b;
         char *p;

src/core/cgroup.h

@@ -85,7 +85,6 @@ pid_t cgroup_bonding_search_main_pid_list(CGroupBonding *b);
 
 int manager_setup_cgroup(Manager *m);
 void manager_shutdown_cgroup(Manager *m, bool delete);
-void manager_shorten_default_controllers(Manager *m);
 
 int cgroup_bonding_get(Manager *m, const char *cgroup, CGroupBonding **bonding);
 int cgroup_notify_empty(Manager *m, const char *group);

src/core/manager.c

@@ -63,6 +63,7 @@
 #include "exit-status.h"
 #include "virt.h"
 #include "watchdog.h"
+#include "cgroup-util.h"
 
 /* As soon as 16 units are in our GC queue, make sure to run a gc sweep */
 #define GC_QUEUE_ENTRIES_MAX 16
@@ -3172,7 +3173,7 @@ int manager_set_default_controllers(Manager *m, char **controllers) {
         strv_free(m->default_controllers);
         m->default_controllers = l;
 
-        manager_shorten_default_controllers(m);
+        cg_shorten_controllers(m->default_controllers);
 
         return 0;
 }

src/login/logind.c

@@ -1205,6 +1205,9 @@ int manager_startup(Manager *m) {
         assert(m);
         assert(m->epoll_fd <= 0);
 
+        cg_shorten_controllers(m->reset_controllers);
+        cg_shorten_controllers(m->controllers);
+
         m->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
         if (m->epoll_fd < 0)
                 return -errno;

src/shared/cgroup-util.c

@@ -34,6 +34,7 @@
 #include "set.h"
 #include "macro.h"
 #include "util.h"
+#include "strv.h"
 
 int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
         char *fs;
@@ -1100,3 +1101,35 @@ int cg_get_user_path(char **path) {
         *path = p;
         return 0;
 }
+
+char **cg_shorten_controllers(char **controllers) {
+        char **f, **t;
+
+        controllers = strv_uniq(controllers);
+
+        if (!controllers)
+                return controllers;
+
+        for (f = controllers, t = controllers; *f; f++) {
+                char *cc;
+
+                if (streq(*f, "systemd") || streq(*f, SYSTEMD_CGROUP_CONTROLLER)) {
+                        free(*f);
+                        continue;
+                }
+
+                cc = alloca(sizeof("/sys/fs/cgroup/") + strlen(*f));
+                strcpy(stpcpy(cc, "/sys/fs/cgroup/"), *f);
+
+                if (access(cc, F_OK) < 0) {
+                        log_debug("Controller %s is not available, removing from controllers list.", *f);
+                        free(*f);
+                        continue;
+                }
+
+                *(t++) = *f;
+        }
+
+        *t = NULL;
+        return controllers;
+}

src/shared/cgroup-util.h

@@ -70,4 +70,6 @@ int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_
 
 int cg_get_user_path(char **path);
 
+char **cg_shorten_controllers(char **controllers);
+
 #endif