Fix paths: test/udev-test.pl now works under sudo make distcheck

We move the test-udev.c and test-libudev.c from src/test to test.
This corrects the a problem with hard coded relative paths finding
the test/test/sys directory created by test/udev-test.pl.

This commit draws heavily from nvinson patch in

 https://github.com/gentoo/eudev/pull/20

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>

3 files changed, 740 insertions, 1 deletions

diff --git a/test/Makefile.am b/test/Makefile.am
index ab3b68e4a6..954b93bcfb 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -1,5 +1,44 @@
 ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
 
+
+AM_CPPFLAGS = \
+	-DVERSION=\"@VERSION@\" \
+	-I $(top_srcdir)/src/libudev \
+	-I $(top_srcdir)/src/udev
+
+noinst_PROGRAMS = \
+	test-libudev \
+	test-udev
+
+test_libudev_SOURCES = \
+	test-libudev.c
+
+test_libudev_LDADD = \
+	$(top_builddir)/src/libudev/libudev-private.la \
+	$(top_builddir)/src/udev/libudev-core.la
+
+test_libudev_CPPFLAGS = \
+	-I $(top_srcdir)/src/libudev \
+	$(AM_CPPFLAGS)
+
+test_udev_SOURCES = \
+	test-udev.c
+
+test_udev_LDADD = \
+	$(top_builddir)/src/libudev/libudev-private.la \
+	$(top_builddir)/src/udev/libudev-core.la \
+	$(BLKID_LIBS) \
+	$(SELINUX_LIBS)
+
+if HAVE_LIBKMOD
+test_udev_LDADD += $(KMOD_LIBS)
+endif
+
+test_udev_CPPFLAGS = \
+	-I $(top_srcdir)/src/udev \
+	$(AM_CPPFLAGS)
+
+
 TESTS = \
 	udev-test.pl \
 	rules-test.sh
@@ -9,7 +48,7 @@ check_DATA = \
 
 test/sys:
 	$(AM_V_at)$(MKDIR_P) $(dir $@)
-	$(AM_V_GEN)tar -C $(top_builddir)/test/ -xJf $(top_srcdir)/test/sys.tar.xz
+	$(AM_V_GEN)tar -C $(top_builddir)/test/test -xJf $(top_srcdir)/test/sys.tar.xz
 
 test-sys-distclean:
 	-rm -rf $(top_builddir)/test/sys
diff --git a/test/test-libudev.c b/test/test-libudev.c
new file mode 100644
index 0000000000..caa3b4d14c
--- /dev/null
+++ b/test/test-libudev.c
@@ -0,0 +1,520 @@
+/***
+  This file is part of systemd.
+
+  Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <getopt.h>
+#include <syslog.h>
+#include <fcntl.h>
+#include <sys/epoll.h>
+
+#include "libudev.h"
+#include "util.h"
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+
+static void log_fn(struct udev *udev,
+                   int priority, const char *file, int line, const char *fn,
+                   const char *format, va_list args)
+{
+        printf("test-libudev: %s %s:%d ", fn, file, line);
+        vprintf(format, args);
+}
+
+static void print_device(struct udev_device *device)
+{
+        const char *str;
+        dev_t devnum;
+        int count;
+        struct udev_list_entry *list_entry;
+
+        printf("*** device: %p ***\n", device);
+        str = udev_device_get_action(device);
+        if (str != NULL)
+                printf("action:    '%s'\n", str);
+
+        str = udev_device_get_syspath(device);
+        printf("syspath:   '%s'\n", str);
+
+        str = udev_device_get_sysname(device);
+        printf("sysname:   '%s'\n", str);
+
+        str = udev_device_get_sysnum(device);
+        if (str != NULL)
+                printf("sysnum:    '%s'\n", str);
+
+        str = udev_device_get_devpath(device);
+        printf("devpath:   '%s'\n", str);
+
+        str = udev_device_get_subsystem(device);
+        if (str != NULL)
+                printf("subsystem: '%s'\n", str);
+
+        str = udev_device_get_devtype(device);
+        if (str != NULL)
+                printf("devtype:   '%s'\n", str);
+
+        str = udev_device_get_driver(device);
+        if (str != NULL)
+                printf("driver:    '%s'\n", str);
+
+        str = udev_device_get_devnode(device);
+        if (str != NULL)
+                printf("devname:   '%s'\n", str);
+
+        devnum = udev_device_get_devnum(device);
+        if (major(devnum) > 0)
+                printf("devnum:    %u:%u\n", major(devnum), minor(devnum));
+
+        count = 0;
+        udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(device)) {
+                printf("link:      '%s'\n", udev_list_entry_get_name(list_entry));
+                count++;
+        }
+        if (count > 0)
+                printf("found %i links\n", count);
+
+        count = 0;
+        udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(device)) {
+                printf("property:  '%s=%s'\n",
+                       udev_list_entry_get_name(list_entry),
+                       udev_list_entry_get_value(list_entry));
+                count++;
+        }
+        if (count > 0)
+                printf("found %i properties\n", count);
+
+        str = udev_device_get_property_value(device, "MAJOR");
+        if (str != NULL)
+                printf("MAJOR: '%s'\n", str);
+
+        str = udev_device_get_sysattr_value(device, "dev");
+        if (str != NULL)
+                printf("attr{dev}: '%s'\n", str);
+
+        printf("\n");
+}
+
+static int test_device(struct udev *udev, const char *syspath)
+{
+        struct udev_device *device;
+
+        printf("looking at device: %s\n", syspath);
+        device = udev_device_new_from_syspath(udev, syspath);
+        if (device == NULL) {
+                printf("no device found\n");
+                return -1;
+        }
+        print_device(device);
+        udev_device_unref(device);
+        return 0;
+}
+
+static int test_device_parents(struct udev *udev, const char *syspath)
+{
+        struct udev_device *device;
+        struct udev_device *device_parent;
+
+        printf("looking at device: %s\n", syspath);
+        device = udev_device_new_from_syspath(udev, syspath);
+        if (device == NULL)
+                return -1;
+
+        printf("looking at parents\n");
+        device_parent = device;
+        do {
+                print_device(device_parent);
+                device_parent = udev_device_get_parent(device_parent);
+        } while (device_parent != NULL);
+
+        printf("looking at parents again\n");
+        device_parent = device;
+        do {
+                print_device(device_parent);
+                device_parent = udev_device_get_parent(device_parent);
+        } while (device_parent != NULL);
+        udev_device_unref(device);
+
+        return 0;
+}
+
+static int test_device_devnum(struct udev *udev)
+{
+        dev_t devnum = makedev(1, 3);
+        struct udev_device *device;
+
+        printf("looking up device: %u:%u\n", major(devnum), minor(devnum));
+        device = udev_device_new_from_devnum(udev, 'c', devnum);
+        if (device == NULL)
+                return -1;
+        print_device(device);
+        udev_device_unref(device);
+        return 0;
+}
+
+static int test_device_subsys_name(struct udev *udev)
+{
+        struct udev_device *device;
+
+        printf("looking up device: 'block':'sda'\n");
+        device = udev_device_new_from_subsystem_sysname(udev, "block", "sda");
+        if (device == NULL)
+                return -1;
+        print_device(device);
+        udev_device_unref(device);
+
+        printf("looking up device: 'subsystem':'pci'\n");
+        device = udev_device_new_from_subsystem_sysname(udev, "subsystem", "pci");
+        if (device == NULL)
+                return -1;
+        print_device(device);
+        udev_device_unref(device);
+
+        printf("looking up device: 'drivers':'scsi:sd'\n");
+        device = udev_device_new_from_subsystem_sysname(udev, "drivers", "scsi:sd");
+        if (device == NULL)
+                return -1;
+        print_device(device);
+        udev_device_unref(device);
+
+        printf("looking up device: 'module':'printk'\n");
+        device = udev_device_new_from_subsystem_sysname(udev, "module", "printk");
+        if (device == NULL)
+                return -1;
+        print_device(device);
+        udev_device_unref(device);
+        return 0;
+}
+
+static int test_enumerate_print_list(struct udev_enumerate *enumerate)
+{
+        struct udev_list_entry *list_entry;
+        int count = 0;
+
+        udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(enumerate)) {
+                struct udev_device *device;
+
+                device = udev_device_new_from_syspath(udev_enumerate_get_udev(enumerate),
+                                                      udev_list_entry_get_name(list_entry));
+                if (device != NULL) {
+                        printf("device: '%s' (%s)\n",
+                               udev_device_get_syspath(device),
+                               udev_device_get_subsystem(device));
+                        udev_device_unref(device);
+                        count++;
+                }
+        }
+        printf("found %i devices\n\n", count);
+        return count;
+}
+
+static int test_monitor(struct udev *udev)
+{
+        struct udev_monitor *udev_monitor = NULL;
+        int fd_ep;
+        int fd_udev = -1;
+        struct epoll_event ep_udev, ep_stdin;
+
+        fd_ep = epoll_create1(EPOLL_CLOEXEC);
+        if (fd_ep < 0) {
+                printf("error creating epoll fd: %m\n");
+                goto out;
+        }
+
+        udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
+        if (udev_monitor == NULL) {
+                printf("no socket\n");
+                goto out;
+        }
+        fd_udev = udev_monitor_get_fd(udev_monitor);
+
+        if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, "block", NULL) < 0 ||
+            udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, "tty", NULL) < 0 ||
+            udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, "usb", "usb_device") < 0) {
+                printf("filter failed\n");
+                goto out;
+        }
+
+        if (udev_monitor_enable_receiving(udev_monitor) < 0) {
+                printf("bind failed\n");
+                goto out;
+        }
+
+        memset(&ep_udev, 0, sizeof(struct epoll_event));
+        ep_udev.events = EPOLLIN;
+        ep_udev.data.fd = fd_udev;
+        if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_udev, &ep_udev) < 0) {
+                printf("fail to add fd to epoll: %m\n");
+                goto out;
+        }
+
+        memset(&ep_stdin, 0, sizeof(struct epoll_event));
+        ep_stdin.events = EPOLLIN;
+        ep_stdin.data.fd = STDIN_FILENO;
+        if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, STDIN_FILENO, &ep_stdin) < 0) {
+                printf("fail to add fd to epoll: %m\n");
+                goto out;
+        }
+
+        for (;;) {
+                int fdcount;
+                struct epoll_event ev[4];
+                struct udev_device *device;
+                int i;
+
+                printf("waiting for events from udev, press ENTER to exit\n");
+                fdcount = epoll_wait(fd_ep, ev, ARRAY_SIZE(ev), -1);
+                printf("epoll fd count: %i\n", fdcount);
+
+                for (i = 0; i < fdcount; i++) {
+                        if (ev[i].data.fd == fd_udev && ev[i].events & EPOLLIN) {
+                                device = udev_monitor_receive_device(udev_monitor);
+                                if (device == NULL) {
+                                        printf("no device from socket\n");
+                                        continue;
+                                }
+                                print_device(device);
+                                udev_device_unref(device);
+                        } else if (ev[i].data.fd == STDIN_FILENO && ev[i].events & EPOLLIN) {
+                                printf("exiting loop\n");
+                                goto out;
+                        }
+                }
+        }
+out:
+        if (fd_ep >= 0)
+                close(fd_ep);
+        udev_monitor_unref(udev_monitor);
+        return 0;
+}
+
+static int test_queue(struct udev *udev)
+{
+        struct udev_queue *udev_queue;
+        unsigned long long int seqnum;
+        struct udev_list_entry *list_entry;
+
+        udev_queue = udev_queue_new(udev);
+        if (udev_queue == NULL)
+                return -1;
+        seqnum = udev_queue_get_kernel_seqnum(udev_queue);
+        printf("seqnum kernel: %llu\n", seqnum);
+        seqnum = udev_queue_get_udev_seqnum(udev_queue);
+        printf("seqnum udev  : %llu\n", seqnum);
+
+        if (udev_queue_get_queue_is_empty(udev_queue))
+                printf("queue is empty\n");
+        printf("get queue list\n");
+        udev_list_entry_foreach(list_entry, udev_queue_get_queued_list_entry(udev_queue))
+                printf("queued: '%s' [%s]\n", udev_list_entry_get_name(list_entry), udev_list_entry_get_value(list_entry));
+        printf("\n");
+        printf("get queue list again\n");
+        udev_list_entry_foreach(list_entry, udev_queue_get_queued_list_entry(udev_queue))
+                printf("queued: '%s' [%s]\n", udev_list_entry_get_name(list_entry), udev_list_entry_get_value(list_entry));
+        printf("\n");
+
+        list_entry = udev_queue_get_queued_list_entry(udev_queue);
+        if (list_entry != NULL) {
+                printf("event [%llu] is queued\n", seqnum);
+                seqnum = strtoull(udev_list_entry_get_value(list_entry), NULL, 10);
+                if (udev_queue_get_seqnum_is_finished(udev_queue, seqnum))
+                        printf("event [%llu] is not finished\n", seqnum);
+                else
+                        printf("event [%llu] is finished\n", seqnum);
+        }
+        printf("\n");
+        udev_queue_unref(udev_queue);
+        return 0;
+}
+
+static int test_enumerate(struct udev *udev, const char *subsystem)
+{
+        struct udev_enumerate *udev_enumerate;
+
+        printf("enumerate '%s'\n", subsystem == NULL ? "<all>" : subsystem);
+        udev_enumerate = udev_enumerate_new(udev);
+        if (udev_enumerate == NULL)
+                return -1;
+        udev_enumerate_add_match_subsystem(udev_enumerate, subsystem);
+        udev_enumerate_scan_devices(udev_enumerate);
+        test_enumerate_print_list(udev_enumerate);
+        udev_enumerate_unref(udev_enumerate);
+
+        printf("enumerate 'net' + duplicated scan + null + zero\n");
+        udev_enumerate = udev_enumerate_new(udev);
+        if (udev_enumerate == NULL)
+                return -1;
+        udev_enumerate_add_match_subsystem(udev_enumerate, "net");
+        udev_enumerate_scan_devices(udev_enumerate);
+        udev_enumerate_scan_devices(udev_enumerate);
+        udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/zero");
+        udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/null");
+        udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/zero");
+        udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/null");
+        udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/zero");
+        udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/null");
+        udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/null");
+        udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/zero");
+        udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/zero");
+        udev_enumerate_scan_devices(udev_enumerate);
+        test_enumerate_print_list(udev_enumerate);
+        udev_enumerate_unref(udev_enumerate);
+
+        printf("enumerate 'block'\n");
+        udev_enumerate = udev_enumerate_new(udev);
+        if (udev_enumerate == NULL)
+                return -1;
+        udev_enumerate_add_match_subsystem(udev_enumerate,"block");
+        udev_enumerate_add_match_is_initialized(udev_enumerate);
+        udev_enumerate_scan_devices(udev_enumerate);
+        test_enumerate_print_list(udev_enumerate);
+        udev_enumerate_unref(udev_enumerate);
+
+        printf("enumerate 'not block'\n");
+        udev_enumerate = udev_enumerate_new(udev);
+        if (udev_enumerate == NULL)
+                return -1;
+        udev_enumerate_add_nomatch_subsystem(udev_enumerate, "block");
+        udev_enumerate_scan_devices(udev_enumerate);
+        test_enumerate_print_list(udev_enumerate);
+        udev_enumerate_unref(udev_enumerate);
+
+        printf("enumerate 'pci, mem, vc'\n");
+        udev_enumerate = udev_enumerate_new(udev);
+        if (udev_enumerate == NULL)
+                return -1;
+        udev_enumerate_add_match_subsystem(udev_enumerate, "pci");
+        udev_enumerate_add_match_subsystem(udev_enumerate, "mem");
+        udev_enumerate_add_match_subsystem(udev_enumerate, "vc");
+        udev_enumerate_scan_devices(udev_enumerate);
+        test_enumerate_print_list(udev_enumerate);
+        udev_enumerate_unref(udev_enumerate);
+
+        printf("enumerate 'subsystem'\n");
+        udev_enumerate = udev_enumerate_new(udev);
+        if (udev_enumerate == NULL)
+                return -1;
+        udev_enumerate_scan_subsystems(udev_enumerate);
+        test_enumerate_print_list(udev_enumerate);
+        udev_enumerate_unref(udev_enumerate);
+
+        printf("enumerate 'property IF_FS_*=filesystem'\n");
+        udev_enumerate = udev_enumerate_new(udev);
+        if (udev_enumerate == NULL)
+                return -1;
+        udev_enumerate_add_match_property(udev_enumerate, "ID_FS*", "filesystem");
+        udev_enumerate_scan_devices(udev_enumerate);
+        test_enumerate_print_list(udev_enumerate);
+        udev_enumerate_unref(udev_enumerate);
+        return 0;
+}
+
+static int test_hwdb(struct udev *udev, const char *modalias) {
+        struct udev_hwdb * hwdb;
+        struct udev_list_entry *entry;
+
+        hwdb = udev_hwdb_new(udev);
+
+        udev_list_entry_foreach(entry, udev_hwdb_get_properties_list_entry(hwdb, modalias, 0))
+                printf("'%s'='%s'\n", udev_list_entry_get_name(entry), udev_list_entry_get_value(entry));
+        printf("\n");
+
+        hwdb = udev_hwdb_unref(hwdb);
+        return 0;
+}
+
+int main(int argc, char *argv[])
+{
+        struct udev *udev = NULL;
+        static const struct option options[] = {
+                { "syspath", required_argument, NULL, 'p' },
+                { "subsystem", required_argument, NULL, 's' },
+                { "debug", no_argument, NULL, 'd' },
+                { "help", no_argument, NULL, 'h' },
+                { "version", no_argument, NULL, 'V' },
+                {}
+        };
+        const char *syspath = "/devices/virtual/mem/null";
+        const char *subsystem = NULL;
+        char path[1024];
+
+        udev = udev_new();
+        printf("context: %p\n", udev);
+        if (udev == NULL) {
+                printf("no context\n");
+                return 1;
+        }
+        udev_set_log_fn(udev, log_fn);
+        printf("set log: %p\n", log_fn);
+
+        for (;;) {
+                int option;
+
+                option = getopt_long(argc, argv, "+p:s:dhV", options, NULL);
+                if (option == -1)
+                        break;
+
+                switch (option) {
+                case 'p':
+                        syspath = optarg;
+                        break;
+                case 's':
+                        subsystem = optarg;
+                        break;
+                case 'd':
+                        if (udev_get_log_priority(udev) < LOG_INFO)
+                                udev_set_log_priority(udev, LOG_INFO);
+                        break;
+                case 'h':
+                        printf("--debug --syspath= --subsystem= --help\n");
+                        goto out;
+                case 'V':
+                        printf("%s\n", VERSION);
+                        goto out;
+                default:
+                        goto out;
+                }
+        }
+
+        /* add sys path if needed */
+        if (!startswith(syspath, "/sys")) {
+                snprintf(path, sizeof(path), "/sys/%s", syspath);
+                syspath = path;
+        }
+
+        test_device(udev, syspath);
+        test_device_devnum(udev);
+        test_device_subsys_name(udev);
+        test_device_parents(udev, syspath);
+
+        test_enumerate(udev, subsystem);
+
+        test_queue(udev);
+
+        test_hwdb(udev, "usb:v0D50p0011*");
+
+        test_monitor(udev);
+out:
+        udev_unref(udev);
+        return 0;
+}
diff --git a/test/test-udev.c b/test/test-udev.c
new file mode 100644
index 0000000000..26e173de63
--- /dev/null
+++ b/test/test-udev.c
@@ -0,0 +1,180 @@
+/***
+  This file is part of systemd.
+
+  Copyright 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
+  Copyright 2004-2012 Kay Sievers <kay@vrfy.org>
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdio.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <errno.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <grp.h>
+#include <sched.h>
+#include <sys/mount.h>
+#include <sys/signalfd.h>
+
+#include "udev.h"
+
+#ifndef HAVE_UNSHARE
+#include <sys/syscall.h>
+/* Provide our own replacement with local reach*/
+static inline int unshare (int x) { return syscall(SYS_unshare, x); }
+#endif
+
+#ifndef _USE_GNU
+/* Make sure CLONE_NEWNS macro is available */
+#include <linux/sched.h>
+#endif
+
+void udev_main_log(struct udev *udev, int priority,
+                   const char *file, int line, const char *fn,
+                   const char *format, va_list args) {}
+
+static int fake_filesystems(void) {
+        static const struct fakefs {
+                const char *src;
+                const char *target;
+                const char *error;
+        } fakefss[] = {
+                { "test/sys", "/sys",                   "failed to mount test /sys" },
+                { "test/dev", "/dev",                   "failed to mount test /dev" },
+                { "test/run", "/run",                   "failed to mount test /run" },
+                { "test/run", "/etc/udev/rules.d",      "failed to mount empty /etc/udev/rules.d" },
+        };
+        unsigned int i;
+        int err;
+
+        err = unshare(CLONE_NEWNS);
+        if (err < 0) {
+                err = -errno;
+                fprintf(stderr, "failed to call unshare(): %m\n");
+                goto out;
+        }
+
+        if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) < 0) {
+                err = -errno;
+                fprintf(stderr, "failed to mount / as private: %m\n");
+                goto out;
+        }
+
+        for (i = 0; i < ELEMENTSOF(fakefss); i++) {
+                err = mount(fakefss[i].src, fakefss[i].target, "tmpfs", MS_BIND, NULL);
+                if (err < 0) {
+                        err = -errno;
+                        fprintf(stderr, "%s %m", fakefss[i].error);
+                        return err;
+                }
+        }
+out:
+        return err;
+}
+
+
+int main(int argc, char *argv[])
+{
+        struct udev *udev;
+        struct udev_event *event = NULL;
+        struct udev_device *dev = NULL;
+        struct udev_rules *rules = NULL;
+        char syspath[UTIL_PATH_SIZE];
+        const char *devpath;
+        const char *action;
+        sigset_t mask, sigmask_orig;
+        int err;
+
+        err = fake_filesystems();
+        if (err < 0)
+                return EXIT_FAILURE;
+
+        udev = udev_new();
+        if (udev == NULL)
+                exit(EXIT_FAILURE);
+        log_debug("version %s\n", VERSION);
+        label_init("/dev");
+
+        sigprocmask(SIG_SETMASK, NULL, &sigmask_orig);
+
+        action = argv[1];
+        if (action == NULL) {
+                log_error("action missing\n");
+                goto out;
+        }
+
+        devpath = argv[2];
+        if (devpath == NULL) {
+                log_error("devpath missing\n");
+                goto out;
+        }
+
+        rules = udev_rules_new(udev, 1);
+
+        util_strscpyl(syspath, sizeof(syspath), "/sys", devpath, NULL);
+        dev = udev_device_new_from_syspath(udev, syspath);
+        if (dev == NULL) {
+                log_debug("unknown device '%s'\n", devpath);
+                goto out;
+        }
+
+        udev_device_set_action(dev, action);
+        event = udev_event_new(dev);
+
+        sigfillset(&mask);
+        sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
+        event->fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
+        if (event->fd_signal < 0) {
+                fprintf(stderr, "error creating signalfd\n");
+                goto out;
+        }
+
+        /* do what devtmpfs usually provides us */
+        if (udev_device_get_devnode(dev) != NULL) {
+                mode_t mode = 0600;
+
+                if (strcmp(udev_device_get_subsystem(dev), "block") == 0)
+                        mode |= S_IFBLK;
+                else
+                        mode |= S_IFCHR;
+
+                if (strcmp(action, "remove") != 0) {
+                        mkdir_parents_label(udev_device_get_devnode(dev), 0755);
+                        mknod(udev_device_get_devnode(dev), mode, udev_device_get_devnum(dev));
+                } else {
+                        unlink(udev_device_get_devnode(dev));
+                        util_delete_path(udev, udev_device_get_devnode(dev));
+                }
+        }
+
+        err = udev_event_execute_rules(event, rules, &sigmask_orig);
+        if (err == 0)
+                udev_event_execute_run(event, NULL);
+out:
+        if (event != NULL && event->fd_signal >= 0)
+                close(event->fd_signal);
+        udev_event_unref(event);
+        udev_device_unref(dev);
+        udev_rules_unref(rules);
+        label_finish();
+        udev_unref(udev);
+        if (err != 0)
+                return EXIT_FAILURE;
+        return EXIT_SUCCESS;
+}