udev: remove configuration options for /dev, /sys, /run directories

26 files changed, 196 insertions, 381 deletions

diff --git a/src/libudev/libudev-device-private.c b/src/libudev/libudev-device-private.c
index 91fd06c025..c58cde2ff6 100644
--- a/src/libudev/libudev-device-private.c
+++ b/src/libudev/libudev-device-private.c
@@ -31,7 +31,7 @@ static void udev_device_tag(struct udev_device *dev, const char *tag, bool add)
         id = udev_device_get_id_filename(dev);
         if (id == NULL)
                 return;
-        util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/tags/", tag, "/", id, NULL);
+        util_strscpyl(filename, sizeof(filename), TEST_PREFIX "/run/udev/tags/", tag, "/", id, NULL);
 
         if (add) {
                 int fd;
@@ -108,7 +108,7 @@ int udev_device_update_db(struct udev_device *udev_device)
                 return -1;
 
         has_info = device_has_info(udev_device);
-        util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/data/", id, NULL);
+        util_strscpyl(filename, sizeof(filename), TEST_PREFIX "/run/udev/data/", id, NULL);
 
         /* do not store anything for otherwise empty devices */
         if (!has_info &&
@@ -138,10 +138,8 @@ int udev_device_update_db(struct udev_device *udev_device)
                 struct udev_list_entry *list_entry;
 
                 if (major(udev_device_get_devnum(udev_device)) > 0) {
-                        size_t devlen = strlen(udev_get_dev_path(udev))+1;
-
                         udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device))
-                                fprintf(f, "S:%s\n", &udev_list_entry_get_name(list_entry)[devlen]);
+                                fprintf(f, "S:%s\n", udev_list_entry_get_name(list_entry) + strlen(TEST_PREFIX "/dev/"));
                         if (udev_device_get_devlink_priority(udev_device) != 0)
                                 fprintf(f, "L:%i\n", udev_device_get_devlink_priority(udev_device));
                         if (udev_device_get_watch_handle(udev_device) >= 0)
@@ -173,13 +171,12 @@ int udev_device_update_db(struct udev_device *udev_device)
 int udev_device_delete_db(struct udev_device *udev_device)
 {
         const char *id;
-        struct udev *udev = udev_device_get_udev(udev_device);
         char filename[UTIL_PATH_SIZE];
 
         id = udev_device_get_id_filename(udev_device);
         if (id == NULL)
                 return -1;
-        util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/data/", id, NULL);
+        util_strscpyl(filename, sizeof(filename), TEST_PREFIX "/run/udev/data/", id, NULL);
         unlink(filename);
         return 0;
 }
diff --git a/src/libudev/libudev-device.c b/src/libudev/libudev-device.c
index 257d6355fe..212163bb92 100644
--- a/src/libudev/libudev-device.c
+++ b/src/libudev/libudev-device.c
@@ -356,7 +356,7 @@ void udev_device_add_property_from_string_parse(struct udev_device *udev_device,
         if (strncmp(property, "DEVPATH=", 8) == 0) {
                 char path[UTIL_PATH_SIZE];
 
-                util_strscpyl(path, sizeof(path), udev_get_sys_path(udev_device->udev), &property[8], NULL);
+                util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys", &property[8], NULL);
                 udev_device_set_syspath(udev_device, path);
         } else if (strncmp(property, "SUBSYSTEM=", 10) == 0) {
                 udev_device_set_subsystem(udev_device, &property[10]);
@@ -473,7 +473,7 @@ int udev_device_read_db(struct udev_device *udev_device, const char *dbfile)
                 id = udev_device_get_id_filename(udev_device);
                 if (id == NULL)
                         return -1;
-                util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev_device->udev), "/data/", id, NULL);
+                util_strscpyl(filename, sizeof(filename), TEST_PREFIX "/run/udev/data/", id, NULL);
                 dbfile = filename;
         }
 
@@ -496,7 +496,7 @@ int udev_device_read_db(struct udev_device *udev_device, const char *dbfile)
                 val = &line[2];
                 switch(line[0]) {
                 case 'S':
-                        util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_device->udev), "/", val, NULL);
+                        util_strscpyl(filename, sizeof(filename), TEST_PREFIX "/dev/", val, NULL);
                         udev_device_add_devlink(udev_device, filename, 0);
                         break;
                 case 'L':
@@ -624,7 +624,6 @@ struct udev_device *udev_device_new(struct udev *udev)
  **/
 _public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
 {
-        size_t len;
         const char *subdir;
         char path[UTIL_PATH_SIZE];
         char *pos;
@@ -637,14 +636,13 @@ _public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, con
                 return NULL;
 
         /* path starts in sys */
-        len = strlen(udev_get_sys_path(udev));
-        if (strncmp(syspath, udev_get_sys_path(udev), len) != 0) {
+        if (strncmp(syspath, TEST_PREFIX "/sys", strlen(TEST_PREFIX "/sys")) != 0) {
                 dbg(udev, "not in sys :%s\n", syspath);
                 return NULL;
         }
 
         /* path is not a root directory */
-        subdir = &syspath[len+1];
+        subdir = syspath + strlen(TEST_PREFIX "/sys");
         pos = strrchr(subdir, '/');
         if (pos == NULL || pos[1] == '\0' || pos < &subdir[2])
                 return NULL;
@@ -653,7 +651,7 @@ _public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, con
         util_strscpy(path, sizeof(path), syspath);
         util_resolve_sys_link(udev, path, sizeof(path));
 
-        if (strncmp(&path[len], "/devices/", 9) == 0) {
+        if (strncmp(path + strlen(TEST_PREFIX "/sys"), "/devices/", 9) == 0) {
                 char file[UTIL_PATH_SIZE];
 
                 /* all "devices" require a "uevent" file */
@@ -705,8 +703,8 @@ _public_ struct udev_device *udev_device_new_from_devnum(struct udev *udev, char
                 return NULL;
 
         /* use /sys/dev/{block,char}/<maj>:<min> link */
-        snprintf(path, sizeof(path), "%s/dev/%s/%u:%u",
-                 udev_get_sys_path(udev), type_str, major(devnum), minor(devnum));
+        snprintf(path, sizeof(path), TEST_PREFIX "/sys/dev/%s/%u:%u",
+                 type_str, major(devnum), minor(devnum));
         return udev_device_new_from_syspath(udev, path);
 }
 
@@ -782,32 +780,27 @@ struct udev_device *udev_device_new_from_id_filename(struct udev *udev, char *id
  **/
 _public_ struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
 {
-        char path_full[UTIL_PATH_SIZE];
-        char *path;
-        size_t l;
+        char path[UTIL_PATH_SIZE];
         struct stat statbuf;
 
-        path = path_full;
-        l = util_strpcpyl(&path, sizeof(path_full), udev_get_sys_path(udev), NULL);
-
         if (strcmp(subsystem, "subsystem") == 0) {
-                util_strscpyl(path, l, "/subsystem/", sysname, NULL);
-                if (stat(path_full, &statbuf) == 0)
+                util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys/subsystem/", sysname, NULL);
+                if (stat(path, &statbuf) == 0)
                         goto found;
 
-                util_strscpyl(path, l, "/bus/", sysname, NULL);
-                if (stat(path_full, &statbuf) == 0)
+                util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys/bus/", sysname, NULL);
+                if (stat(path, &statbuf) == 0)
                         goto found;
 
-                util_strscpyl(path, l, "/class/", sysname, NULL);
-                if (stat(path_full, &statbuf) == 0)
+                util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys/class/", sysname, NULL);
+                if (stat(path, &statbuf) == 0)
                         goto found;
                 goto out;
         }
 
         if (strcmp(subsystem, "module") == 0) {
-                util_strscpyl(path, l, "/module/", sysname, NULL);
-                if (stat(path_full, &statbuf) == 0)
+                util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys/module/", sysname, NULL);
+                if (stat(path, &statbuf) == 0)
                         goto found;
                 goto out;
         }
@@ -822,32 +815,32 @@ _public_ struct udev_device *udev_device_new_from_subsystem_sysname(struct udev
                         driver[0] = '\0';
                         driver = &driver[1];
 
-                        util_strscpyl(path, l, "/subsystem/", subsys, "/drivers/", driver, NULL);
-                        if (stat(path_full, &statbuf) == 0)
+                        util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys/subsystem/", subsys, "/drivers/", driver, NULL);
+                        if (stat(path, &statbuf) == 0)
                                 goto found;
 
-                        util_strscpyl(path, l, "/bus/", subsys, "/drivers/", driver, NULL);
-                        if (stat(path_full, &statbuf) == 0)
+                        util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys/bus/", subsys, "/drivers/", driver, NULL);
+                        if (stat(path, &statbuf) == 0)
                                 goto found;
                 }
                 goto out;
         }
 
-        util_strscpyl(path, l, "/subsystem/", subsystem, "/devices/", sysname, NULL);
-        if (stat(path_full, &statbuf) == 0)
+        util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys/subsystem/", subsystem, "/devices/", sysname, NULL);
+        if (stat(path, &statbuf) == 0)
                 goto found;
 
-        util_strscpyl(path, l, "/bus/", subsystem, "/devices/", sysname, NULL);
-        if (stat(path_full, &statbuf) == 0)
+        util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys/bus/", subsystem, "/devices/", sysname, NULL);
+        if (stat(path, &statbuf) == 0)
                 goto found;
 
-        util_strscpyl(path, l, "/class/", subsystem, "/", sysname, NULL);
-        if (stat(path_full, &statbuf) == 0)
+        util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys/class/", subsystem, "/", sysname, NULL);
+        if (stat(path, &statbuf) == 0)
                 goto found;
 out:
         return NULL;
 found:
-        return udev_device_new_from_syspath(udev, path_full);
+        return udev_device_new_from_syspath(udev, path);
 }
 
 /**
@@ -893,7 +886,7 @@ static struct udev_device *device_new_from_parent(struct udev_device *udev_devic
         const char *subdir;
 
         util_strscpy(path, sizeof(path), udev_device->syspath);
-        subdir = &path[strlen(udev_get_sys_path(udev_device->udev))+1];
+        subdir = path + strlen(TEST_PREFIX "/sys/");
         for (;;) {
                 char *pos;
 
@@ -1438,7 +1431,7 @@ int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath
         udev_device->syspath = strdup(syspath);
         if (udev_device->syspath ==  NULL)
                 return -ENOMEM;
-        udev_device->devpath = &udev_device->syspath[strlen(udev_get_sys_path(udev_device->udev))];
+        udev_device->devpath = udev_device->syspath + strlen(TEST_PREFIX "/sys");
         udev_device_add_property(udev_device, "DEVPATH", udev_device->devpath);
 
         pos = strrchr(udev_device->syspath, '/');
@@ -1471,7 +1464,7 @@ int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode
 {
         free(udev_device->devnode);
         if (devnode[0] != '/') {
-                if (asprintf(&udev_device->devnode, "%s/%s", udev_get_dev_path(udev_device->udev), devnode) < 0)
+                if (asprintf(&udev_device->devnode, TEST_PREFIX "/dev/%s", devnode) < 0)
                         udev_device->devnode = NULL;
         } else {
                 udev_device->devnode = strdup(devnode);
diff --git a/src/libudev/libudev-enumerate.c b/src/libudev/libudev-enumerate.c
index 7b9a732ce6..ed4f62c66c 100644
--- a/src/libudev/libudev-enumerate.c
+++ b/src/libudev/libudev-enumerate.c
@@ -204,12 +204,10 @@ static bool devices_delay_end(struct udev *udev, const char *syspath)
                 "/block/dm-",
                 NULL
         };
-        size_t len;
         int i;
 
-        len = strlen(udev_get_sys_path(udev));
         for (i = 0; delay_device_list[i] != NULL; i++) {
-                if (strstr(&syspath[len], delay_device_list[i]) != NULL)
+                if (strstr(syspath + strlen("/sys"), delay_device_list[i]) != NULL)
                         return true;
         }
         return false;
@@ -624,7 +622,6 @@ static bool match_sysname(struct udev_enumerate *udev_enumerate, const char *sys
 static int scan_dir_and_add_devices(struct udev_enumerate *udev_enumerate,
                                     const char *basedir, const char *subdir1, const char *subdir2)
 {
-        struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
         char path[UTIL_PATH_SIZE];
         size_t l;
         char *s;
@@ -632,7 +629,7 @@ static int scan_dir_and_add_devices(struct udev_enumerate *udev_enumerate,
         struct dirent *dent;
 
         s = path;
-        l = util_strpcpyl(&s, sizeof(path), udev_get_sys_path(udev), "/", basedir, NULL);
+        l = util_strpcpyl(&s, sizeof(path), "/sys/", basedir, NULL);
         if (subdir1 != NULL)
                 l = util_strpcpyl(&s, l, "/", subdir1, NULL);
         if (subdir2 != NULL)
@@ -707,13 +704,11 @@ static bool match_subsystem(struct udev_enumerate *udev_enumerate, const char *s
 
 static int scan_dir(struct udev_enumerate *udev_enumerate, const char *basedir, const char *subdir, const char *subsystem)
 {
-        struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
-
         char path[UTIL_PATH_SIZE];
         DIR *dir;
         struct dirent *dent;
 
-        util_strscpyl(path, sizeof(path), udev_get_sys_path(udev), "/", basedir, NULL);
+        util_strscpyl(path, sizeof(path), "/sys/", basedir, NULL);
         dir = opendir(path);
         if (dir == NULL)
                 return -1;
@@ -756,7 +751,6 @@ _public_ int udev_enumerate_add_syspath(struct udev_enumerate *udev_enumerate, c
 
 static int scan_devices_tags(struct udev_enumerate *udev_enumerate)
 {
-        struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
         struct udev_list_entry *list_entry;
 
         /* scan only tagged devices, use tags reverse-index, instead of searching all devices in /sys */
@@ -765,8 +759,7 @@ static int scan_devices_tags(struct udev_enumerate *udev_enumerate)
                 struct dirent *dent;
                 char path[UTIL_PATH_SIZE];
 
-                util_strscpyl(path, sizeof(path), udev_get_run_path(udev), "/tags/",
-                              udev_list_entry_get_name(list_entry), NULL);
+                util_strscpyl(path, sizeof(path), "/run/udev/tags/", udev_list_entry_get_name(list_entry), NULL);
                 dir = opendir(path);
                 if (dir == NULL)
                         continue;
@@ -861,12 +854,9 @@ static int scan_devices_children(struct udev_enumerate *enumerate)
 
 static int scan_devices_all(struct udev_enumerate *udev_enumerate)
 {
-        struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
-        char base[UTIL_PATH_SIZE];
         struct stat statbuf;
 
-        util_strscpyl(base, sizeof(base), udev_get_sys_path(udev), "/subsystem", NULL);
-        if (stat(base, &statbuf) == 0) {
+        if (stat("/sys/subsystem", &statbuf) == 0) {
                 /* we have /subsystem/, forget all the old stuff */
                 scan_dir(udev_enumerate, "subsystem", "devices", NULL);
         } else {
@@ -907,8 +897,6 @@ _public_ int udev_enumerate_scan_devices(struct udev_enumerate *udev_enumerate)
  **/
 _public_ int udev_enumerate_scan_subsystems(struct udev_enumerate *udev_enumerate)
 {
-        struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
-        char base[UTIL_PATH_SIZE];
         struct stat statbuf;
         const char *subsysdir;
 
@@ -919,8 +907,7 @@ _public_ int udev_enumerate_scan_subsystems(struct udev_enumerate *udev_enumerat
         if (match_subsystem(udev_enumerate, "module"))
                 scan_dir_and_add_devices(udev_enumerate, "module", NULL, NULL);
 
-        util_strscpyl(base, sizeof(base), udev_get_sys_path(udev), "/subsystem", NULL);
-        if (stat(base, &statbuf) == 0)
+        if (stat("/sys/subsystem", &statbuf) == 0)
                 subsysdir = "subsystem";
         else
                 subsysdir = "bus";
diff --git a/src/libudev/libudev-private.h b/src/libudev/libudev-private.h
index 91f92264dd..986c40c91e 100644
--- a/src/libudev/libudev-private.h
+++ b/src/libudev/libudev-private.h
@@ -19,9 +19,13 @@
 #include "macro.h"
 #include "libudev.h"
 
-#define READ_END 0
+#define READ_END  0
 #define WRITE_END 1
 
+#ifndef TEST_PREFIX
+#define TEST_PREFIX ""
+#endif
+
 /* avoid (sometimes expensive) calculations of parameters for debug output */
 #define udev_log_cond(udev, prio, arg...) \
   do { \
diff --git a/src/libudev/libudev-queue-private.c b/src/libudev/libudev-queue-private.c
index ca6d229a2c..f653e6db4c 100644
--- a/src/libudev/libudev-queue-private.c
+++ b/src/libudev/libudev-queue-private.c
@@ -101,14 +101,10 @@ struct udev_queue_export *udev_queue_export_unref(struct udev_queue_export *udev
 
 void udev_queue_export_cleanup(struct udev_queue_export *udev_queue_export)
 {
-        char filename[UTIL_PATH_SIZE];
-
         if (udev_queue_export == NULL)
                 return;
-        util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev_queue_export->udev), "/queue.tmp", NULL);
-        unlink(filename);
-        util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev_queue_export->udev), "/queue.bin", NULL);
-        unlink(filename);
+        unlink("/run/udev/queue.tmp");
+        unlink("/run/udev/queue.bin");
 }
 
 static int skip_to(FILE *file, long offset)
@@ -201,8 +197,6 @@ static int rebuild_queue_file(struct udev_queue_export *udev_queue_export)
 {
         unsigned long long int seqnum;
         struct queue_devpaths *devpaths = NULL;
-        char filename[UTIL_PATH_SIZE];
-        char filename_tmp[UTIL_PATH_SIZE];
         FILE *new_queue_file = NULL;
         unsigned int i;
 
@@ -218,8 +212,7 @@ static int rebuild_queue_file(struct udev_queue_export *udev_queue_export)
         }
 
         /* create new queue file */
-        util_strscpyl(filename_tmp, sizeof(filename_tmp), udev_get_run_path(udev_queue_export->udev), "/queue.tmp", NULL);
-        new_queue_file = fopen(filename_tmp, "w+");
+        new_queue_file = fopen("/run/udev/queue.tmp", "w+");
         if (new_queue_file == NULL)
                 goto error;
         seqnum = udev_queue_export->seqnum_max;
@@ -252,8 +245,7 @@ static int rebuild_queue_file(struct udev_queue_export *udev_queue_export)
                 goto error;
 
         /* rename the new file on top of the old one */
-        util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev_queue_export->udev), "/queue.bin", NULL);
-        if (rename(filename_tmp, filename) != 0)
+        if (rename("/run/udev/queue.tmp", "/run/udev/queue.bin") != 0)
                 goto error;
 
         if (udev_queue_export->queue_file != NULL)
diff --git a/src/libudev/libudev-queue.c b/src/libudev/libudev-queue.c
index 0e0df8597d..ca23002307 100644
--- a/src/libudev/libudev-queue.c
+++ b/src/libudev/libudev-queue.c
@@ -121,14 +121,12 @@ _public_ struct udev *udev_queue_get_udev(struct udev_queue *udev_queue)
 
 unsigned long long int udev_get_kernel_seqnum(struct udev *udev)
 {
-        char filename[UTIL_PATH_SIZE];
         unsigned long long int seqnum;
         int fd;
         char buf[32];
         ssize_t len;
 
-        util_strscpyl(filename, sizeof(filename), udev_get_sys_path(udev), "/kernel/uevent_seqnum", NULL);
-        fd = open(filename, O_RDONLY|O_CLOEXEC);
+        fd = open("/sys/kernel/uevent_seqnum", O_RDONLY|O_CLOEXEC);
         if (fd < 0)
                 return 0;
         len = read(fd, buf, sizeof(buf));
@@ -210,7 +208,7 @@ static FILE *open_queue_file(struct udev_queue *udev_queue, unsigned long long i
         char filename[UTIL_PATH_SIZE];
         FILE *queue_file;
 
-        util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev_queue->udev), "/queue.bin", NULL);
+        util_strscpyl(filename, sizeof(filename), "/run/udev/queue.bin", NULL);
         queue_file = fopen(filename, "re");
         if (queue_file == NULL)
                 return NULL;
@@ -437,7 +435,7 @@ _public_ struct udev_list_entry *udev_queue_get_queued_list_entry(struct udev_qu
                 snprintf(seqnum_str, sizeof(seqnum_str), "%llu", seqnum);
 
                 s = syspath;
-                l = util_strpcpyl(&s, sizeof(syspath), udev_get_sys_path(udev_queue->udev), NULL);
+                l = util_strpcpy(&s, sizeof(syspath), "/sys");
                 len = udev_queue_read_devpath(queue_file, s, l);
                 if (len < 0)
                         break;
diff --git a/src/libudev/libudev-selinux-private.c b/src/libudev/libudev-selinux-private.c
index d68097f991..e9e65ad41d 100644
--- a/src/libudev/libudev-selinux-private.c
+++ b/src/libudev/libudev-selinux-private.c
@@ -29,7 +29,7 @@ void udev_selinux_init(struct udev *udev)
         dbg(udev, "selinux=%i\n", selinux_enabled);
         if (!selinux_enabled)
                 return;
-        matchpathcon_init_prefix(NULL, udev_get_dev_path(udev));
+        matchpathcon_init_prefix(NULL, TEST_PREFIX "/dev");
         if (getfscreatecon(&selinux_prev_scontext) < 0) {
                 err(udev, "getfscreatecon failed\n");
                 selinux_prev_scontext = NULL;
diff --git a/src/libudev/libudev.c b/src/libudev/libudev.c
index 74b53cbf1b..212c5fdd75 100644
--- a/src/libudev/libudev.c
+++ b/src/libudev/libudev.c
@@ -41,12 +41,6 @@ struct udev {
                        int priority, const char *file, int line, const char *fn,
                        const char *format, va_list args);
         void *userdata;
-        char *sys_path;
-        char *dev_path;
-        char *rules_path[4];
-        unsigned long long rules_path_ts[4];
-        int rules_path_count;
-        char *run_path;
         struct udev_list properties_list;
         int log_priority;
 };
@@ -100,14 +94,6 @@ _public_ void udev_set_userdata(struct udev *udev, void *userdata)
         udev->userdata = userdata;
 }
 
-static char *set_value(char **s, const char *v)
-{
-        free(*s);
-        *s = strdup(v);
-        util_remove_trailing_chars(*s, '/');
-        return *s;
-}
-
 /**
  * udev_new:
  *
@@ -123,7 +109,6 @@ _public_ struct udev *udev_new(void)
 {
         struct udev *udev;
         const char *env;
-        char *config_file = NULL;
         FILE *f;
 
         udev = calloc(1, sizeof(struct udev));
@@ -134,21 +119,7 @@ _public_ struct udev *udev_new(void)
         udev->log_priority = LOG_ERR;
         udev_list_init(udev, &udev->properties_list, true);
 
-        /* custom config file */
-        env = getenv("UDEV_CONFIG_FILE");
-        if (env != NULL) {
-                if (set_value(&config_file, env) == NULL)
-                        goto err;
-                udev_add_property(udev, "UDEV_CONFIG_FILE", config_file);
-        }
-
-        /* default config file */
-        if (config_file == NULL)
-                config_file = strdup(SYSCONFDIR "/udev/udev.conf");
-        if (config_file == NULL)
-                goto err;
-
-        f = fopen(config_file, "re");
+        f = fopen(SYSCONFDIR "/udev/udev.conf", "re");
         if (f != NULL) {
                 char line[UTIL_LINE_SIZE];
                 int line_nr = 0;
@@ -172,7 +143,7 @@ _public_ struct udev *udev_new(void)
                         /* split key/value */
                         val = strchr(key, '=');
                         if (val == NULL) {
-                                err(udev, "missing <key>=<value> in '%s'[%i], skip line\n", config_file, line_nr);
+                                err(udev, "missing <key>=<value> in " SYSCONFDIR "/udev/udev.conf[%i]; skip line\n", line_nr);
                                 continue;
                         }
                         val[0] = '\0';
@@ -204,7 +175,7 @@ _public_ struct udev *udev_new(void)
                         /* unquote */
                         if (val[0] == '"' || val[0] == '\'') {
                                 if (val[len-1] != val[0]) {
-                                        err(udev, "inconsistent quoting in '%s'[%i], skip line\n", config_file, line_nr);
+                                        err(udev, "inconsistent quoting in " SYSCONFDIR "/udev/udev.conf[%i]; skip line\n", line_nr);
                                         continue;
                                 }
                                 val[len-1] = '\0';
@@ -215,23 +186,6 @@ _public_ struct udev *udev_new(void)
                                 udev_set_log_priority(udev, util_log_priority(val));
                                 continue;
                         }
-                        if (strcmp(key, "udev_root") == 0) {
-                                set_value(&udev->dev_path, val);
-                                continue;
-                        }
-                        if (strcmp(key, "udev_run") == 0) {
-                                set_value(&udev->run_path, val);
-                                continue;
-                        }
-                        if (strcmp(key, "udev_sys") == 0) {
-                                set_value(&udev->sys_path, val);
-                                continue;
-                        }
-                        if (strcmp(key, "udev_rules") == 0) {
-                                set_value(&udev->rules_path[0], val);
-                                udev->rules_path_count = 1;
-                                continue;
-                        }
                 }
                 fclose(f);
         }
@@ -241,44 +195,7 @@ _public_ struct udev *udev_new(void)
         if (env != NULL)
                 udev_set_log_priority(udev, util_log_priority(env));
 
-        /* set defaults */
-        if (udev->dev_path == NULL)
-                if (set_value(&udev->dev_path, "/dev") == NULL)
-                        goto err;
-
-        if (udev->sys_path == NULL)
-                if (set_value(&udev->sys_path, "/sys") == NULL)
-                        goto err;
-
-        if (udev->run_path == NULL)
-                if (set_value(&udev->run_path, "/run/udev") == NULL)
-                        goto err;
-
-        if (udev->rules_path[0] == NULL) {
-                /* /usr/lib/udev -- system rules */
-                udev->rules_path[0] = strdup(UDEVLIBEXECDIR "/rules.d");
-                if (!udev->rules_path[0])
-                        goto err;
-
-                /* /run/udev -- runtime rules */
-                if (asprintf(&udev->rules_path[1], "%s/rules.d", udev->run_path) < 0)
-                        goto err;
-
-                /* /etc/udev -- local administration rules */
-                udev->rules_path[2] = strdup(SYSCONFDIR "/udev/rules.d");
-                if (!udev->rules_path[2])
-                        goto err;
-
-                udev->rules_path_count = 3;
-        }
-
-        free(config_file);
         return udev;
-err:
-        free(config_file);
-        err(udev, "context creation failed\n");
-        udev_unref(udev);
-        return NULL;
 }
 
 /**
@@ -313,12 +230,6 @@ _public_ void udev_unref(struct udev *udev)
         if (udev->refcount > 0)
                 return;
         udev_list_cleanup(&udev->properties_list);
-        free(udev->dev_path);
-        free(udev->sys_path);
-        free(udev->rules_path[0]);
-        free(udev->rules_path[1]);
-        free(udev->rules_path[2]);
-        free(udev->run_path);
         free(udev);
 }
 
@@ -372,21 +283,11 @@ _public_ void udev_set_log_priority(struct udev *udev, int priority)
         udev_add_property(udev, "UDEV_LOG", num);
 }
 
-int udev_get_rules_path(struct udev *udev, char **path[], unsigned long long *stamp_usec[])
-{
-        *path = udev->rules_path;
-        if (stamp_usec)
-                *stamp_usec = udev->rules_path_ts;
-        return udev->rules_path_count;
-}
-
 /**
  * udev_get_sys_path:
  * @udev: udev library context
  *
- * Retrieve the sysfs mount point. The default is "/sys". For
- * testing purposes, it can be overridden with udev_sys=
- * in the udev configuration file.
+ * Returns always "/sys"; deprecated, will be removed in a future version.
  *
  * Returns: the sys mount point
  **/
@@ -394,16 +295,14 @@ _public_ const char *udev_get_sys_path(struct udev *udev)
 {
         if (udev == NULL)
                 return NULL;
-        return udev->sys_path;
+        return "/sys";
 }
 
 /**
  * udev_get_dev_path:
  * @udev: udev library context
  *
- * Retrieve the device directory path. The default value is "/dev",
- * the actual value may be overridden in the udev configuration
- * file.
+ * Returns always "/dev"; deprecated, will be removed in a future version.
  *
  * Returns: the device directory path
  **/
@@ -411,14 +310,14 @@ _public_ const char *udev_get_dev_path(struct udev *udev)
 {
         if (udev == NULL)
                 return NULL;
-        return udev->dev_path;
+        return "/dev";
 }
 
 /**
  * udev_get_run_path:
  * @udev: udev library context
  *
- * Retrieve the udev runtime directory path. The default is "/run/udev".
+ * Returns always "/run/udev"; deprecated, will be removed in a future version.
  *
  * Returns: the runtime directory path
  **/
@@ -426,7 +325,7 @@ _public_ const char *udev_get_run_path(struct udev *udev)
 {
         if (udev == NULL)
                 return NULL;
-        return udev->run_path;
+        return "/run/udev";
 }
 
 struct udev_list_entry *udev_add_property(struct udev *udev, const char *key, const char *value)
diff --git a/src/test/test-libudev.c b/src/test/test-libudev.c
index 6161fb3e31..f5c7ae2c30 100644
--- a/src/test/test-libudev.c
+++ b/src/test/test-libudev.c
@@ -434,7 +434,6 @@ int main(int argc, char *argv[])
         const char *syspath = "/devices/virtual/mem/null";
         const char *subsystem = NULL;
         char path[1024];
-        const char *str;
 
         udev = udev_new();
         printf("context: %p\n", udev);
@@ -474,14 +473,9 @@ int main(int argc, char *argv[])
                 }
         }
 
-        str = udev_get_sys_path(udev);
-        printf("sys_path: '%s'\n", str);
-        str = udev_get_dev_path(udev);
-        printf("dev_path: '%s'\n", str);
-
         /* add sys path if needed */
-        if (strncmp(syspath, udev_get_sys_path(udev), strlen(udev_get_sys_path(udev))) != 0) {
-                snprintf(path, sizeof(path), "%s%s", udev_get_sys_path(udev), syspath);
+        if (strncmp(syspath, "/sys", strlen("/sys")) != 0) {
+                snprintf(path, sizeof(path), "/sys/%s", syspath);
                 syspath = path;
         }
 
diff --git a/src/test/test-udev.c b/src/test/test-udev.c
index 150cb16a31..b843e5f648 100644
--- a/src/test/test-udev.c
+++ b/src/test/test-udev.c
@@ -68,7 +68,7 @@ int main(int argc, char *argv[])
 
         rules = udev_rules_new(udev, 1);
 
-        util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), devpath, NULL);
+        util_strscpyl(syspath, sizeof(syspath), TEST_PREFIX "/sys", devpath, NULL);
         dev = udev_device_new_from_syspath(udev, syspath);
         if (dev == NULL) {
                 log_debug("unknown device '%s'\n", devpath);
diff --git a/src/udev/accelerometer/accelerometer.c b/src/udev/accelerometer/accelerometer.c
index 4c5e47d0b7..08be363370 100644
--- a/src/udev/accelerometer/accelerometer.c
+++ b/src/udev/accelerometer/accelerometer.c
@@ -294,7 +294,7 @@ int main (int argc, char** argv)
         }
 
         /* get the device */
-        snprintf(devpath, sizeof(devpath), "%s/%s", udev_get_sys_path(udev), argv[optind]);
+        snprintf(devpath, sizeof(devpath), "/sys/%s", argv[optind]);
         dev = udev_device_new_from_syspath(udev, devpath);
         if (dev == NULL) {
                 fprintf(stderr, "unable to access '%s'\n", devpath);
@@ -307,9 +307,8 @@ int main (int argc, char** argv)
                 return 0;
         }
 
-        /* Get the children devices and find the devnode
-         * FIXME: use udev_enumerate_add_match_children() instead
-         * when it's available */
+        /* Get the children devices and find the devnode */
+        /* FIXME: use udev_enumerate_add_match_parent() instead */
         devnode = NULL;
         enumerate = udev_enumerate_new(udev);
         udev_enumerate_add_match_property(enumerate, "ID_PATH", id_path);
diff --git a/src/udev/collect/collect.c b/src/udev/collect/collect.c
index 076fe479e2..882564a5f5 100644
--- a/src/udev/collect/collect.c
+++ b/src/udev/collect/collect.c
@@ -405,7 +405,7 @@ int main(int argc, char **argv)
         if (debug)
                 fprintf(stderr, "Using checkpoint '%s'\n", checkpoint);
 
-        util_strscpyl(tmpdir, sizeof(tmpdir), udev_get_run_path(udev), "/collect", NULL);
+        util_strscpyl(tmpdir, sizeof(tmpdir), "/run/udev/collect", NULL);
         fd = prepare(tmpdir, checkpoint);
         if (fd < 0) {
                 ret = 3;
diff --git a/src/udev/udev-builtin-firmware.c b/src/udev/udev-builtin-firmware.c
index 5ba712c89d..bd2716fdc8 100644
--- a/src/udev/udev-builtin-firmware.c
+++ b/src/udev/udev-builtin-firmware.c
@@ -112,7 +112,7 @@ static int builtin_firmware(struct udev_device *dev, int argc, char *argv[], boo
         }
 
         util_path_encode(firmware, fwencpath, sizeof(fwencpath));
-        util_strscpyl(misspath, sizeof(misspath), udev_get_run_path(udev), "/firmware-missing/", fwencpath, NULL);
+        util_strscpyl(misspath, sizeof(misspath), "/run/udev/firmware-missing/", fwencpath, NULL);
         util_strscpyl(loadpath, sizeof(loadpath), udev_device_get_syspath(dev), "/loading", NULL);
 
         if (fwfile == NULL) {
diff --git a/src/udev/udev-ctrl.c b/src/udev/udev-ctrl.c
index 71c330f6f9..fcb0cd48a6 100644
--- a/src/udev/udev-ctrl.c
+++ b/src/udev/udev-ctrl.c
@@ -93,8 +93,7 @@ struct udev_ctrl *udev_ctrl_new_from_fd(struct udev *udev, int fd)
         }
 
         uctrl->saddr.sun_family = AF_LOCAL;
-        util_strscpyl(uctrl->saddr.sun_path, sizeof(uctrl->saddr.sun_path),
-                      udev_get_run_path(udev), "/control", NULL);
+        util_strscpy(uctrl->saddr.sun_path, sizeof(uctrl->saddr.sun_path), "/run/udev/control");
         uctrl->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(uctrl->saddr.sun_path);
         return uctrl;
 }
diff --git a/src/udev/udev-event.c b/src/udev/udev-event.c
index eab1bae27f..d330062ebf 100644
--- a/src/udev/udev-event.c
+++ b/src/udev/udev-event.c
@@ -318,46 +318,38 @@ subst:
                         if (dev_parent == NULL)
                                 break;
                         devnode = udev_device_get_devnode(dev_parent);
-                        if (devnode != NULL) {
-                                size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
-
-                                l = util_strpcpy(&s, l, &devnode[devlen]);
-                        }
+                        if (devnode != NULL)
+                                l = util_strpcpy(&s, l, devnode + strlen(TEST_PREFIX "/dev/"));
                         break;
                 }
                 case SUBST_DEVNODE:
                         if (udev_device_get_devnode(dev) != NULL)
                                 l = util_strpcpy(&s, l, udev_device_get_devnode(dev));
                         break;
-                case SUBST_NAME: {
-                        if (event->name != NULL) {
+                case SUBST_NAME:
+                        if (event->name != NULL)
                                 l = util_strpcpy(&s, l, event->name);
-                        } else if (udev_device_get_devnode(dev) != NULL) {
-                                size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
-
-                                l = util_strpcpy(&s, l, &udev_device_get_devnode(dev)[devlen]);
-                        } else {
+                        else if (udev_device_get_devnode(dev) != NULL)
+                                l = util_strpcpy(&s, l, udev_device_get_devnode(dev) + strlen(TEST_PREFIX "/dev/"));
+                        else
                                 l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
-                        }
                         break;
-                }
                 case SUBST_LINKS: {
-                        size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
                         struct udev_list_entry *list_entry;
 
                         list_entry = udev_device_get_devlinks_list_entry(dev);
                         if (list_entry == NULL)
                                 break;
-                        l = util_strpcpy(&s, l, &udev_list_entry_get_name(list_entry)[devlen]);
+                        l = util_strpcpy(&s, l, udev_list_entry_get_name(list_entry) + strlen(TEST_PREFIX "/dev/"));
                         udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
-                                l = util_strpcpyl(&s, l, " ", &udev_list_entry_get_name(list_entry)[devlen], NULL);
+                                l = util_strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry) + strlen(TEST_PREFIX "/dev/"), NULL);
                         break;
                 }
                 case SUBST_ROOT:
-                        l = util_strpcpy(&s, l, udev_get_dev_path(event->udev));
+                        l = util_strpcpy(&s, l, TEST_PREFIX "/dev");
                         break;
                 case SUBST_SYS:
-                        l = util_strpcpy(&s, l, udev_get_sys_path(event->udev));
+                        l = util_strpcpy(&s, l, TEST_PREFIX "/sys");
                         break;
                 case SUBST_ENV:
                         if (attr == NULL) {
diff --git a/src/udev/udev-node.c b/src/udev/udev-node.c
index 8e1318872a..26a43e9623 100644
--- a/src/udev/udev-node.c
+++ b/src/udev/udev-node.c
@@ -203,8 +203,8 @@ static void link_update(struct udev_device *dev, const char *slink, bool add)
         const char *target;
         char buf[UTIL_PATH_SIZE];
 
-        util_path_encode(&slink[strlen(udev_get_dev_path(udev))+1], name_enc, sizeof(name_enc));
-        util_strscpyl(dirname, sizeof(dirname), udev_get_run_path(udev), "/links/", name_enc, NULL);
+        util_path_encode(slink + strlen(TEST_PREFIX "/dev"), name_enc, sizeof(name_enc));
+        util_strscpyl(dirname, sizeof(dirname), TEST_PREFIX "/run/udev/links/", name_enc, NULL);
         util_strscpyl(filename, sizeof(filename), dirname, "/", udev_device_get_id_filename(dev), NULL);
 
         if (!add && unlink(filename) == 0)
@@ -329,8 +329,7 @@ void udev_node_add(struct udev_device *dev, mode_t mode, uid_t uid, gid_t gid)
                 return;
 
         /* always add /dev/{block,char}/$major:$minor */
-        snprintf(filename, sizeof(filename), "%s/%s/%u:%u",
-                 udev_get_dev_path(udev),
+        snprintf(filename, sizeof(filename), TEST_PREFIX "/dev/%s/%u:%u",
                  strcmp(udev_device_get_subsystem(dev), "block") == 0 ? "block" : "char",
                  major(udev_device_get_devnum(dev)), minor(udev_device_get_devnum(dev)));
         node_symlink(udev, udev_device_get_devnode(dev), filename);
@@ -347,7 +346,6 @@ void udev_node_add(struct udev_device *dev, mode_t mode, uid_t uid, gid_t gid)
 
 void udev_node_remove(struct udev_device *dev)
 {
-        struct udev *udev = udev_device_get_udev(dev);
         struct udev_list_entry *list_entry;
         char filename[UTIL_PATH_SIZE];
 
@@ -356,8 +354,7 @@ void udev_node_remove(struct udev_device *dev)
                 link_update(dev, udev_list_entry_get_name(list_entry), 0);
 
         /* remove /dev/{block,char}/$major:$minor */
-        snprintf(filename, sizeof(filename), "%s/%s/%u:%u",
-                 udev_get_dev_path(udev),
+        snprintf(filename, sizeof(filename), TEST_PREFIX "/dev/%s/%u:%u",
                  strcmp(udev_device_get_subsystem(dev), "block") == 0 ? "block" : "char",
                  major(udev_device_get_devnum(dev)), minor(udev_device_get_devnum(dev)));
         unlink(filename);
diff --git a/src/udev/udev-rules.c b/src/udev/udev-rules.c
index 55d7e30c02..1ec817872d 100644
--- a/src/udev/udev-rules.c
+++ b/src/udev/udev-rules.c
@@ -36,6 +36,13 @@
 #define PREALLOC_STRBUF         32 * 1024
 #define PREALLOC_TRIE           256
 
+/* configuration directories with last modification timestamp */
+static const char *rules_dirs[] = {
+        TEST_PREFIX UDEVLIBEXECDIR "/rules.d",
+        TEST_PREFIX "/run/udev/rules.d",
+        TEST_PREFIX SYSCONFDIR "/udev/rules.d",
+};
+
 struct uid_gid {
         unsigned int name_off;
         union {
@@ -58,6 +65,7 @@ struct trie_node {
 
 struct udev_rules {
         struct udev *udev;
+        unsigned long long dirs_ts_usec[ELEMENTSOF(rules_dirs)];
         int resolve_names;
 
         /* every key in the rules file becomes a token */
@@ -664,7 +672,6 @@ static gid_t add_gid(struct udev_rules *rules, const char *group)
 
 static int import_property_from_string(struct udev_device *dev, char *line)
 {
-        struct udev *udev = udev_device_get_udev(dev);
         char *key;
         char *val;
         size_t len;
@@ -724,7 +731,7 @@ static int import_property_from_string(struct udev_device *dev, char *line)
 
                 log_debug("updating devpath from '%s' to '%s'\n",
                           udev_device_get_devpath(dev), val);
-                util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), val, NULL);
+                util_strscpyl(syspath, sizeof(syspath), "/sys", val, NULL);
                 udev_device_set_syspath(dev, syspath);
         } else {
                 struct udev_list_entry *entry;
@@ -807,7 +814,6 @@ static int import_parent_into_properties(struct udev_device *dev, const char *fi
 #define WAIT_LOOP_PER_SECOND                50
 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 {
-        struct udev *udev = udev_device_get_udev(dev);
         char filepath[UTIL_PATH_SIZE];
         char devicepath[UTIL_PATH_SIZE];
         struct stat stats;
@@ -816,8 +822,7 @@ static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
         /* a relative path is a device attribute */
         devicepath[0] = '\0';
         if (file[0] != '/') {
-                util_strscpyl(devicepath, sizeof(devicepath),
-                              udev_get_sys_path(udev), udev_device_get_devpath(dev), NULL);
+                util_strscpyl(devicepath, sizeof(devicepath), udev_device_get_syspath(dev), NULL);
                 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
                 file = filepath;
         }
@@ -1746,7 +1751,7 @@ struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
         struct udev_list file_list;
         struct udev_list_entry *file_loop;
         struct token end_token;
-        char **s;
+        unsigned int i;
 
         rules = calloc(1, sizeof(struct udev_rules));
         if (rules == NULL)
@@ -1786,8 +1791,8 @@ struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
         memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
         rules->trie_nodes_cur = 1;
 
-        for (udev_get_rules_path(udev, &s, NULL); *s != NULL; s++)
-                add_matching_files(udev, &file_list, *s, ".rules");
+        for (i = 0; i < ELEMENTSOF(rules_dirs); i++)
+                add_matching_files(udev, &file_list, rules_dirs[i], ".rules");
 
         /* add all filenames to the string buffer */
         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
@@ -1884,6 +1889,33 @@ struct udev_rules *udev_rules_unref(struct udev_rules *rules)
         return NULL;
 }
 
+bool udev_rules_check_timestamp(struct udev_rules *rules)
+{
+        unsigned int i;
+        bool changed = false;
+
+        for (i = 0; i < ELEMENTSOF(rules_dirs); i++) {
+                struct stat stats;
+
+                if (stat(rules_dirs[i], &stats) < 0)
+                        continue;
+
+                if (rules->dirs_ts_usec[i] == ts_usec(&stats.st_mtim))
+                        continue;
+
+                /* first check */
+                if (rules->dirs_ts_usec[i] != 0) {
+                        log_debug("reload - timestamp of '%s' changed\n", rules_dirs[i]);
+                        changed = true;
+                }
+
+                /* update timestamp */
+                rules->dirs_ts_usec[i] = ts_usec(&stats.st_mtim);
+        }
+
+        return changed;
+}
+
 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
 {
         char *key_value = &rules->buf[token->key.value_off];
@@ -2054,14 +2086,13 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
                                 goto nomatch;
                         break;
                 case TK_M_DEVLINK: {
-                        size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
                         struct udev_list_entry *list_entry;
                         bool match = false;
 
                         udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
                                 const char *devlink;
 
-                                devlink =  &udev_list_entry_get_name(list_entry)[devlen];
+                                devlink =  udev_list_entry_get_name(list_entry) + strlen(TEST_PREFIX "/dev/");
                                 if (match_key(rules, cur, devlink) == 0) {
                                         match = true;
                                         break;
@@ -2534,15 +2565,12 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
                                 if (count > 0)
                                         log_debug("%i character(s) replaced\n", count);
                         }
-                        if (major(udev_device_get_devnum(event->dev))) {
-                                size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
-
-                                if (strcmp(name_str, &udev_device_get_devnode(event->dev)[devlen]) != 0) {
-                                        log_error("NAME=\"%s\" ignored, kernel device nodes "
-                                            "can not be renamed; please fix it in %s:%u\n", name,
-                                            &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
-                                        break;
-                                }
+                        if (major(udev_device_get_devnum(event->dev)) &&
+                            (strcmp(name_str, udev_device_get_devnode(event->dev) + strlen(TEST_PREFIX "/dev/")) != 0)) {
+                                log_error("NAME=\"%s\" ignored, kernel device nodes "
+                                    "can not be renamed; please fix it in %s:%u\n", name,
+                                    &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
+                                break;
                         }
                         free(event->name);
                         event->name = strdup(name_str);
@@ -2583,7 +2611,7 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
                                 next[0] = '\0';
                                 log_debug("LINK '%s' %s:%u\n", pos,
                                           &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
-                                util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
+                                util_strscpyl(filename, sizeof(filename), TEST_PREFIX "/dev/", pos, NULL);
                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
                                 while (isspace(next[1]))
                                         next++;
@@ -2593,7 +2621,7 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
                         if (pos[0] != '\0') {
                                 log_debug("LINK '%s' %s:%u\n", pos,
                                           &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
-                                util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
+                                util_strscpyl(filename, sizeof(filename), TEST_PREFIX "/dev/", pos, NULL);
                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
                         }
                         break;
@@ -2703,7 +2731,7 @@ void udev_rules_apply_static_dev_perms(struct udev_rules *rules)
                         /* we assure, that the permissions tokens are sorted before the static token */
                         if (mode == 0 && uid == 0 && gid == 0)
                                 goto next;
-                        util_strscpyl(filename, sizeof(filename), udev_get_dev_path(rules->udev), "/",
+                        util_strscpyl(filename, sizeof(filename), TEST_PREFIX "/dev/",
                                       &rules->buf[cur->key.value_off], NULL);
                         if (stat(filename, &stats) != 0)
                                 goto next;
diff --git a/src/udev/udev-watch.c b/src/udev/udev-watch.c
index 968728eba9..7d5b30bd68 100644
--- a/src/udev/udev-watch.c
+++ b/src/udev/udev-watch.c
@@ -49,41 +49,33 @@ int udev_watch_init(struct udev *udev)
  */
 void udev_watch_restore(struct udev *udev)
 {
-        char filename[UTIL_PATH_SIZE], oldname[UTIL_PATH_SIZE];
-
         if (inotify_fd < 0)
                 return;
 
-        util_strscpyl(oldname, sizeof(oldname), udev_get_run_path(udev), "/watch.old", NULL);
-        util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/watch", NULL);
-        if (rename(filename, oldname) == 0) {
+        if (rename("/run/udev/watch", "/run/udev/watch.old") == 0) {
                 DIR *dir;
                 struct dirent *ent;
 
-                dir = opendir(oldname);
+                dir = opendir("/run/udev/watch.old");
                 if (dir == NULL) {
-                        log_error("unable to open old watches dir '%s', old watches will not be restored: %m", oldname);
+                        log_error("unable to open old watches dir /run/udev/watch.old; old watches will not be restored: %m");
                         return;
                 }
 
                 for (ent = readdir(dir); ent != NULL; ent = readdir(dir)) {
                         char device[UTIL_PATH_SIZE];
-                        char *s;
-                        size_t l;
                         ssize_t len;
                         struct udev_device *dev;
 
                         if (ent->d_name[0] == '.')
                                 continue;
 
-                        s = device;
-                        l = util_strpcpy(&s, sizeof(device), udev_get_sys_path(udev));
-                        len = readlinkat(dirfd(dir), ent->d_name, s, l);
-                        if (len <= 0 || len == (ssize_t)l)
+                        len = readlinkat(dirfd(dir), ent->d_name, device, sizeof(device));
+                        if (len <= 0 || len == (ssize_t)sizeof(device))
                                 goto unlink;
-                        s[len] = '\0';
+                        device[len] = '\0';
 
-                        dev = udev_device_new_from_id_filename(udev, s);
+                        dev = udev_device_new_from_id_filename(udev, device);
                         if (dev == NULL)
                                 goto unlink;
 
@@ -95,10 +87,10 @@ unlink:
                 }
 
                 closedir(dir);
-                rmdir(oldname);
+                rmdir("/run/udev/watch.old");
 
         } else if (errno != ENOENT) {
-                log_error("unable to move watches dir '%s', old watches will not be restored: %m", filename);
+                log_error("unable to move watches dir /run/udev/watch; old watches will not be restored: %m");
         }
 }
 
@@ -118,7 +110,7 @@ void udev_watch_begin(struct udev *udev, struct udev_device *dev)
                 return;
         }
 
-        snprintf(filename, sizeof(filename), "%s/watch/%d", udev_get_run_path(udev), wd);
+        snprintf(filename, sizeof(filename), "/run/udev/watch/%d", wd);
         util_create_path(udev, filename);
         unlink(filename);
         symlink(udev_device_get_id_filename(dev), filename);
@@ -141,7 +133,7 @@ void udev_watch_end(struct udev *udev, struct udev_device *dev)
         log_debug("removing watch on '%s'\n", udev_device_get_devnode(dev));
         inotify_rm_watch(inotify_fd, wd);
 
-        snprintf(filename, sizeof(filename), "%s/watch/%d", udev_get_run_path(udev), wd);
+        snprintf(filename, sizeof(filename), "/run/udev/watch/%d", wd);
         unlink(filename);
 
         udev_device_set_watch_handle(dev, -1);
@@ -150,21 +142,17 @@ void udev_watch_end(struct udev *udev, struct udev_device *dev)
 struct udev_device *udev_watch_lookup(struct udev *udev, int wd)
 {
         char filename[UTIL_PATH_SIZE];
-        char majmin[UTIL_PATH_SIZE];
-        char *s;
-        size_t l;
+        char device[UTIL_NAME_SIZE];
         ssize_t len;
 
         if (inotify_fd < 0 || wd < 0)
                 return NULL;
 
-        snprintf(filename, sizeof(filename), "%s/watch/%d", udev_get_run_path(udev), wd);
-        s = majmin;
-        l = util_strpcpy(&s, sizeof(majmin), udev_get_sys_path(udev));
-        len = readlink(filename, s, l);
-        if (len <= 0 || (size_t)len == l)
+        snprintf(filename, sizeof(filename), "/run/udev/watch/%d", wd);
+        len = readlink(filename, device, sizeof(device));
+        if (len <= 0 || (size_t)len == sizeof(device))
                 return NULL;
-        s[len] = '\0';
+        device[len] = '\0';
 
-        return udev_device_new_from_id_filename(udev, s);
+        return udev_device_new_from_id_filename(udev, device);
 }
diff --git a/src/udev/udev.h b/src/udev/udev.h
index 681660ecb7..ed5f768ea8 100644
--- a/src/udev/udev.h
+++ b/src/udev/udev.h
@@ -65,6 +65,7 @@ struct udev_watch {
 struct udev_rules;
 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names);
 struct udev_rules *udev_rules_unref(struct udev_rules *rules);
+bool udev_rules_check_timestamp(struct udev_rules *rules);
 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask);
 void udev_rules_apply_static_dev_perms(struct udev_rules *rules);
 
diff --git a/src/udev/udevadm-info.c b/src/udev/udevadm-info.c
index 39221b7374..3b14139459 100644
--- a/src/udev/udevadm-info.c
+++ b/src/udev/udevadm-info.c
@@ -131,26 +131,22 @@ static int print_device_chain(struct udev_device *device)
 
 static void print_record(struct udev_device *device)
 {
-        size_t len;
         const char *str;
         int i;
         struct udev_list_entry *list_entry;
 
         printf("P: %s\n", udev_device_get_devpath(device));
 
-        len = strlen(udev_get_dev_path(udev_device_get_udev(device)));
         str = udev_device_get_devnode(device);
         if (str != NULL)
-                printf("N: %s\n", &str[len+1]);
+                printf("N: %s\n", str + strlen("/dev/"));
 
         i = udev_device_get_devlink_priority(device);
         if (i != 0)
                 printf("L: %i\n", i);
 
-        udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(device)) {
-                len = strlen(udev_get_dev_path(udev_device_get_udev(device)));
-                printf("S: %s\n", &udev_list_entry_get_name(list_entry)[len+1]);
-        }
+        udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(device))
+                printf("S: %s\n", udev_list_entry_get_name(list_entry) + strlen("/dev/"));
 
         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(device))
                 printf("E: %s=%s\n",
@@ -233,42 +229,35 @@ static void cleanup_dir(DIR *dir, mode_t mask, int depth)
 
 static void cleanup_db(struct udev *udev)
 {
-        char filename[UTIL_PATH_SIZE];
         DIR *dir;
 
-        util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/queue.bin", NULL);
-        unlink(filename);
+        unlink("/run/udev/queue.bin");
 
-        util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/data", NULL);
-        dir = opendir(filename);
+        dir = opendir("/run/udev/data");
         if (dir != NULL) {
                 cleanup_dir(dir, S_ISVTX, 1);
                 closedir(dir);
         }
 
-        util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/links", NULL);
-        dir = opendir(filename);
+        dir = opendir("/run/udev/links");
         if (dir != NULL) {
                 cleanup_dir(dir, 0, 2);
                 closedir(dir);
         }
 
-        util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/tags", NULL);
-        dir = opendir(filename);
+        dir = opendir("/run/udev/tags");
         if (dir != NULL) {
                 cleanup_dir(dir, 0, 2);
                 closedir(dir);
         }
 
-        util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/watch", NULL);
-        dir = opendir(filename);
+        dir = opendir("/run/udev/watch");
         if (dir != NULL) {
                 cleanup_dir(dir, 0, 1);
                 closedir(dir);
         }
 
-        util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/firmware-missing", NULL);
-        dir = opendir(filename);
+        dir = opendir("/run/udev/firmware-missing");
         if (dir != NULL) {
                 cleanup_dir(dir, 0, 1);
                 closedir(dir);
@@ -335,9 +324,9 @@ static int uinfo(struct udev *udev, int argc, char *argv[])
                                 rc = 2;
                                 goto exit;
                         }
-                        /* remove /dev if given */
-                        if (strncmp(optarg, udev_get_dev_path(udev), strlen(udev_get_dev_path(udev))) != 0)
-                                util_strscpyl(name, sizeof(name), udev_get_dev_path(udev), "/", optarg, NULL);
+                        /* add /dev if not given */
+                        if (strncmp(optarg, "/dev", strlen("/dev")) != 0)
+                                util_strscpyl(name, sizeof(name), "/dev/", optarg, NULL);
                         else
                                 util_strscpy(name, sizeof(name), optarg);
                         util_remove_trailing_chars(name, '/');
@@ -372,8 +361,8 @@ static int uinfo(struct udev *udev, int argc, char *argv[])
                                 goto exit;
                         }
                         /* add sys dir if needed */
-                        if (strncmp(optarg, udev_get_sys_path(udev), strlen(udev_get_sys_path(udev))) != 0)
-                                util_strscpyl(path, sizeof(path), udev_get_sys_path(udev), optarg, NULL);
+                        if (strncmp(optarg, "/sys", strlen("/sys")) != 0)
+                                util_strscpyl(path, sizeof(path), "/sys", optarg, NULL);
                         else
                                 util_strscpy(path, sizeof(path), optarg);
                         util_remove_trailing_chars(path, '/');
@@ -408,7 +397,7 @@ static int uinfo(struct udev *udev, int argc, char *argv[])
                         root = true;
                         break;
                 case 'R':
-                        printf("%s\n", udev_get_run_path(udev));
+                        printf("/run/udev\n");
                         goto exit;
                 case 'd':
                         action = ACTION_DEVICE_ID_FILE;
@@ -476,26 +465,19 @@ static int uinfo(struct udev *udev, int argc, char *argv[])
                                 goto exit;
                         }
 
-                        if (root) {
+                        if (root)
                                 printf("%s\n", udev_device_get_devnode(device));
-                        } else {
-                                size_t len = strlen(udev_get_dev_path(udev));
-
-                                printf("%s\n", &udev_device_get_devnode(device)[len+1]);
-                        }
+                        else
+                                printf("%s\n", udev_device_get_devnode(device) + strlen("/dev/"));
                         break;
                 }
                 case QUERY_SYMLINK:
                         list_entry = udev_device_get_devlinks_list_entry(device);
                         while (list_entry != NULL) {
-                                if (root) {
+                                if (root)
                                         printf("%s", udev_list_entry_get_name(list_entry));
-                                } else {
-                                        size_t len;
-
-                                        len = strlen(udev_get_dev_path(udev_device_get_udev(device)));
-                                        printf("%s", &udev_list_entry_get_name(list_entry)[len+1]);
-                                }
+                                else
+                                        printf("%s", udev_list_entry_get_name(list_entry) + strlen("/dev/"));
                                 list_entry = udev_list_entry_get_next(list_entry);
                                 if (list_entry != NULL)
                                         printf(" ");
@@ -543,7 +525,7 @@ static int uinfo(struct udev *udev, int argc, char *argv[])
                         rc = 1;
                 break;
         case ACTION_ROOT:
-                printf("%s\n", udev_get_dev_path(udev));
+                printf("/dev\n");
                 break;
         default:
                 fprintf(stderr, "missing option\n");
diff --git a/src/udev/udevadm-settle.c b/src/udev/udevadm-settle.c
index 19c1e99ccb..e70b351eb9 100644
--- a/src/udev/udevadm-settle.c
+++ b/src/udev/udevadm-settle.c
@@ -152,8 +152,8 @@ static int adm_settle(struct udev *udev, int argc, char *argv[])
         if (pfd[0].fd < 0) {
                 log_error("inotify_init failed: %m\n");
         } else {
-                if (inotify_add_watch(pfd[0].fd, udev_get_run_path(udev), IN_MOVED_TO) < 0) {
-                        log_error("watching '%s' failed\n", udev_get_run_path(udev));
+                if (inotify_add_watch(pfd[0].fd, "/run/udev" , IN_MOVED_TO) < 0) {
+                        log_error("watching /run/udev failed\n");
                         close(pfd[0].fd);
                         pfd[0].fd = -1;
                 }
diff --git a/src/udev/udevadm-test-builtin.c b/src/udev/udevadm-test-builtin.c
index 94bb24f5f8..e63b1f4eb7 100644
--- a/src/udev/udevadm-test-builtin.c
+++ b/src/udev/udevadm-test-builtin.c
@@ -95,8 +95,8 @@ static int adm_builtin(struct udev *udev, int argc, char *argv[])
         }
 
         /* add /sys if needed */
-        if (strncmp(syspath, udev_get_sys_path(udev), strlen(udev_get_sys_path(udev))) != 0)
-                util_strscpyl(filename, sizeof(filename), udev_get_sys_path(udev), syspath, NULL);
+        if (strncmp(syspath, "/sys", strlen("/sys")) != 0)
+                util_strscpyl(filename, sizeof(filename), "/sys", syspath, NULL);
         else
                 util_strscpy(filename, sizeof(filename), syspath);
         util_remove_trailing_chars(filename, '/');
diff --git a/src/udev/udevadm-test.c b/src/udev/udevadm-test.c
index f963c1b510..0c8a762540 100644
--- a/src/udev/udevadm-test.c
+++ b/src/udev/udevadm-test.c
@@ -112,8 +112,8 @@ static int adm_test(struct udev *udev, int argc, char *argv[])
         }
 
         /* add /sys if needed */
-        if (strncmp(syspath, udev_get_sys_path(udev), strlen(udev_get_sys_path(udev))) != 0)
-                util_strscpyl(filename, sizeof(filename), udev_get_sys_path(udev), syspath, NULL);
+        if (strncmp(syspath, "/sys", strlen("/sys")) != 0)
+                util_strscpyl(filename, sizeof(filename), "/sys", syspath, NULL);
         else
                 util_strscpy(filename, sizeof(filename), syspath);
         util_remove_trailing_chars(filename, '/');
diff --git a/src/udev/udevadm-trigger.c b/src/udev/udevadm-trigger.c
index 99ef12cb85..a910121ecd 100644
--- a/src/udev/udevadm-trigger.c
+++ b/src/udev/udevadm-trigger.c
@@ -164,8 +164,8 @@ static int adm_trigger(struct udev *udev, int argc, char *argv[])
                         struct udev_device *dev;
 
                         /* add sys dir if needed */
-                        if (strncmp(optarg, udev_get_sys_path(udev), strlen(udev_get_sys_path(udev))) != 0)
-                                util_strscpyl(path, sizeof(path), udev_get_sys_path(udev), optarg, NULL);
+                        if (strncmp(optarg, "/sys", strlen("/sys")) != 0)
+                                util_strscpyl(path, sizeof(path), "/sys", optarg, NULL);
                         else
                                 util_strscpy(path, sizeof(path), optarg);
                         util_remove_trailing_chars(path, '/');
diff --git a/src/udev/udevadm.c b/src/udev/udevadm.c
index 0858c37be8..2b4a845d77 100644
--- a/src/udev/udevadm.c
+++ b/src/udev/udevadm.c
@@ -128,8 +128,6 @@ int main(int argc, char *argv[])
         }
         command = argv[optind];
 
-        log_debug("runtime dir '%s'\n", udev_get_run_path(udev));
-
         if (command != NULL)
                 for (i = 0; i < ELEMENTSOF(udevadm_cmds); i++) {
                         if (strcmp(udevadm_cmds[i]->name, command) == 0) {
diff --git a/src/udev/udevd.c b/src/udev/udevd.c
index 24f0bf6d1e..d6de2aa222 100644
--- a/src/udev/udevd.c
+++ b/src/udev/udevd.c
@@ -856,7 +856,7 @@ static void static_dev_create_from_modules(struct udev *udev)
                 else
                         continue;
 
-                util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/", devname, NULL);
+                util_strscpyl(filename, sizeof(filename), "/dev/", devname, NULL);
                 util_create_path_selinux(udev, filename);
                 udev_selinux_setfscreatecon(udev, filename, mode);
                 log_debug("mknod '%s' %c%u:%u\n", filename, type, maj, min);
@@ -885,7 +885,7 @@ static void static_dev_create_links(struct udev *udev)
         };
         unsigned int i;
 
-        dir = opendir(udev_get_dev_path(udev));
+        dir = opendir("/dev");
         if (dir == NULL)
                 return;
 
@@ -934,16 +934,15 @@ static int convert_db(struct udev *udev)
         struct udev_list_entry *list_entry;
 
         /* current database */
-        util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/data", NULL);
-        if (access(filename, F_OK) >= 0)
+        if (access("/run/udev/data", F_OK) >= 0)
                 return 0;
 
         /* make sure we do not get here again */
-        util_create_path(udev, filename);
+        util_create_path(udev, "/run/udev/data");
         mkdir(filename, 0755);
 
         /* old database */
-        util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/db", NULL);
+        util_strscpyl(filename, sizeof(filename), "/dev/.udev/db", NULL);
         if (access(filename, F_OK) < 0)
                 return 0;
 
@@ -976,7 +975,7 @@ static int convert_db(struct udev *udev)
 
                         /* find database in old location */
                         id = udev_device_get_id_filename(device);
-                        util_strscpyl(from, sizeof(from), udev_get_dev_path(udev), "/.udev/db/", id, NULL);
+                        util_strscpyl(from, sizeof(from), "/dev/.udev/db/", id, NULL);
                         if (lstat(from, &stats) == 0) {
                                 if (!have_db) {
                                         udev_device_read_db(device, from);
@@ -986,9 +985,8 @@ static int convert_db(struct udev *udev)
                         }
 
                         /* find old database with $subsys:$sysname name */
-                        util_strscpyl(from, sizeof(from), udev_get_dev_path(udev),
-                                     "/.udev/db/", udev_device_get_subsystem(device), ":",
-                                     udev_device_get_sysname(device), NULL);
+                        util_strscpyl(from, sizeof(from), "/dev/.udev/db/",
+                                      udev_device_get_subsystem(device), ":", udev_device_get_sysname(device), NULL);
                         if (lstat(from, &stats) == 0) {
                                 if (!have_db) {
                                         udev_device_read_db(device, from);
@@ -999,7 +997,7 @@ static int convert_db(struct udev *udev)
 
                         /* find old database with the encoded devpath name */
                         util_path_encode(udev_device_get_devpath(device), devpath, sizeof(devpath));
-                        util_strscpyl(from, sizeof(from), udev_get_dev_path(udev), "/.udev/db/", devpath, NULL);
+                        util_strscpyl(from, sizeof(from), "/dev/.udev/db/", devpath, NULL);
                         if (lstat(from, &stats) == 0) {
                                 if (!have_db) {
                                         udev_device_read_db(device, from);
@@ -1054,36 +1052,6 @@ static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink)
         return 0;
 }
 
-static bool check_rules_timestamp(struct udev *udev)
-{
-        char **p;
-        unsigned long long *stamp_usec;
-        int i, n;
-        bool changed = false;
-
-        n = udev_get_rules_path(udev, &p, &stamp_usec);
-        for (i = 0; i < n; i++) {
-                struct stat stats;
-
-                if (stat(p[i], &stats) < 0)
-                        continue;
-
-                if (stamp_usec[i] == ts_usec(&stats.st_mtim))
-                        continue;
-
-                /* first check */
-                if (stamp_usec[i] != 0) {
-                        log_debug("reload - timestamp of '%s' changed\n", p[i]);
-                        changed = true;
-                }
-
-                /* update timestamp */
-                stamp_usec[i] = ts_usec(&stats.st_mtim);
-        }
-
-        return changed;
-}
-
 int main(int argc, char *argv[])
 {
         struct udev *udev;
@@ -1216,8 +1184,7 @@ int main(int argc, char *argv[])
         chdir("/");
         umask(022);
 
-        /* /run/udev */
-        mkdir(udev_get_run_path(udev), 0755);
+        mkdir("/run/udev", 0755);
 
         /* create standard links, copy static nodes, create nodes from modules */
         static_dev_create_links(udev);
@@ -1557,7 +1524,7 @@ int main(int argc, char *argv[])
 
                 /* check for changed config, every 3 seconds at most */
                 if ((now_usec() - last_usec) > 3 * 1000 * 1000) {
-                        if (check_rules_timestamp(udev))
+                        if (udev_rules_check_timestamp(rules))
                                 reload = true;
                         if (udev_builtin_validate(udev))
                                 reload = true;