hotplug2: replace udevtrigger from the udev-106 source with a much smaller self-contained, stripped-down version

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@25920 3c298f89-4303-0410-b956-a3cf2f4a3e73

include/target.mk

@@ -12,7 +12,7 @@ __target_inc=1
 DEVICE_TYPE?=router
 
 # Default packages - the really basic set
-DEFAULT_PACKAGES:=base-files libc libgcc busybox dropbear mtd uci opkg udevtrigger hotplug2
+DEFAULT_PACKAGES:=base-files libc libgcc busybox dropbear mtd uci opkg hotplug2
 # For router targets
 DEFAULT_PACKAGES.router:=dnsmasq iptables ppp ppp-mod-pppoe kmod-ipt-nathelper firewall
 DEFAULT_PACKAGES.bootloader:=

package/hotplug2/Makefile

@@ -25,7 +25,6 @@ include $(INCLUDE_DIR)/package.mk
 define Package/hotplug2
   SECTION:=base
   CATEGORY:=Base system
-  DEPENDS:=+udevtrigger
   VERSION:=1.0-beta-$(PKG_RELEASE)
   TITLE:=Version 1.0 Dynamic device management subsystem for embedded systems
   URL:=http://isteve.bofh.cz/~isteve/hotplug2/
@@ -45,10 +44,16 @@ MAKE_FLAGS += \
 	COPTS="$(TARGET_CFLAGS)" \
 	STATIC_WORKER="fork"
 
+define Build/Compile
+	$(call Build/Compile/Default)
+	$(TARGET_CC) $(TARGET_CFLAGS) -o $(PKG_BUILD_DIR)/udevtrigger src/udevtrigger.c
+endef
+
 define Package/hotplug2/install
 	$(INSTALL_DIR) $(1)/etc
 	$(INSTALL_DATA) ./files/hotplug2.rules $(1)/etc/
 	$(INSTALL_DIR) $(1)/sbin
+	$(INSTALL_BIN) $(PKG_BUILD_DIR)/udevtrigger $(1)/sbin/
 	$(INSTALL_BIN) $(PKG_BUILD_DIR)/hotplug2 $(1)/sbin/
 endef
 

package/hotplug2/src/udevtrigger.c

@@ -0,0 +1,345 @@
+/*
+ * Copyright (C) 2004-2006 Kay Sievers <kay@vrfy.org>
+ * Copyright (C) 2006 Hannes Reinecke <hare@suse.de>
+ *
+ *	This program is free software; you can redistribute it and/or modify it
+ *	under the terms of the GNU General Public License as published by the
+ *	Free Software Foundation version 2 of the License.
+ * 
+ *	This program 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
+ *	General Public License for more details.
+ * 
+ *	You should have received a copy of the GNU General Public License along
+ *	with this program; if not, write to the Free Software Foundation, Inc.,
+ *	51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ */
+
+#include <stdlib.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <errno.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <syslog.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#define PATH_SIZE 512
+
+static int verbose;
+static int dry_run;
+
+void log_message(int priority, const char *format, ...)
+{
+	va_list args;
+
+	va_start(args, format);
+	vsyslog(priority, format, args);
+	va_end(args);
+}
+
+#undef err
+#define err(format, arg...)                         \
+    do {                                    \
+        log_message(LOG_ERR ,"%s: " format ,__FUNCTION__ ,## arg);  \
+    } while (0)
+
+#undef info
+#define info(format, arg...)                            \
+    do {                                    \
+        log_message(LOG_INFO ,"%s: " format ,__FUNCTION__ ,## arg); \
+    } while (0)
+
+#ifdef DEBUG
+#undef dbg
+#define dbg(format, arg...)                         \
+    do {                                    \
+        log_message(LOG_DEBUG ,"%s: " format ,__FUNCTION__ ,## arg);    \
+    } while (0)
+#else
+#define dbg(...) do {} while(0)
+#endif
+
+
+static void trigger_uevent(const char *devpath)
+{
+	char filename[PATH_SIZE];
+	int fd;
+
+	strlcpy(filename, "/sys", sizeof(filename));
+	strlcat(filename, devpath, sizeof(filename));
+	strlcat(filename, "/uevent", sizeof(filename));
+
+	if (verbose)
+		printf("%s\n", devpath);
+
+	if (dry_run)
+		return;
+
+	fd = open(filename, O_WRONLY);
+	if (fd < 0) {
+		dbg("error on opening %s: %s\n", filename, strerror(errno));
+		return;
+	}
+
+	if (write(fd, "add", 3) < 0)
+		info("error on triggering %s: %s\n", filename, strerror(errno));
+
+	close(fd);
+}
+
+static int sysfs_resolve_link(char *devpath, size_t size)
+{
+	char link_path[PATH_SIZE];
+	char link_target[PATH_SIZE];
+	int len;
+	int i;
+	int back;
+
+	strlcpy(link_path, "/sys", sizeof(link_path));
+	strlcat(link_path, devpath, sizeof(link_path));
+	len = readlink(link_path, link_target, sizeof(link_target));
+	if (len <= 0)
+		return -1;
+	link_target[len] = '\0';
+	dbg("path link '%s' points to '%s'", devpath, link_target);
+
+	for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; back++)
+		;
+	dbg("base '%s', tail '%s', back %i", devpath, &link_target[back * 3], back);
+	for (i = 0; i <= back; i++) {
+		char *pos = strrchr(devpath, '/');
+
+		if (pos == NULL)
+			return -1;
+		pos[0] = '\0';
+	}
+	dbg("after moving back '%s'", devpath);
+	strlcat(devpath, "/", size);
+	strlcat(devpath, &link_target[back * 3], size);
+	return 0;
+}
+
+
+static int device_list_insert(const char *path)
+{
+	char filename[PATH_SIZE];
+	char devpath[PATH_SIZE];
+	struct stat statbuf;
+
+	dbg("add '%s'" , path);
+
+	/* we only have a device, if we have an uevent file */
+	strlcpy(filename, path, sizeof(filename));
+	strlcat(filename, "/uevent", sizeof(filename));
+	if (stat(filename, &statbuf) < 0)
+		return -1;
+	if (!(statbuf.st_mode & S_IWUSR))
+		return -1;
+
+	strlcpy(devpath, &path[4], sizeof(devpath));
+
+	/* resolve possible link to real target */
+	if (lstat(path, &statbuf) < 0)
+		return -1;
+	if (S_ISLNK(statbuf.st_mode))
+		if (sysfs_resolve_link(devpath, sizeof(devpath)) != 0)
+			return -1;
+
+	trigger_uevent(devpath);
+	return 0;
+}
+
+
+static void scan_subsystem(const char *subsys)
+{
+	char base[PATH_SIZE];
+	DIR *dir;
+	struct dirent *dent;
+
+	strlcpy(base, "/sys/", sizeof(base));
+	strlcat(base, subsys, sizeof(base));
+
+	dir = opendir(base);
+	if (dir != NULL) {
+		for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
+			char dirname[PATH_SIZE];
+			DIR *dir2;
+			struct dirent *dent2;
+
+			if (dent->d_name[0] == '.')
+				continue;
+
+			strlcpy(dirname, base, sizeof(dirname));
+			strlcat(dirname, "/", sizeof(dirname));
+			strlcat(dirname, dent->d_name, sizeof(dirname));
+			strlcat(dirname, "/devices", sizeof(dirname));
+
+			/* look for devices */
+			dir2 = opendir(dirname);
+			if (dir2 != NULL) {
+				for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
+					char dirname2[PATH_SIZE];
+
+					if (dent2->d_name[0] == '.')
+						continue;
+
+					strlcpy(dirname2, dirname, sizeof(dirname2));
+					strlcat(dirname2, "/", sizeof(dirname2));
+					strlcat(dirname2, dent2->d_name, sizeof(dirname2));
+					device_list_insert(dirname2);
+				}
+				closedir(dir2);
+			}
+		}
+		closedir(dir);
+	}
+}
+
+static void scan_block(void)
+{
+	char base[PATH_SIZE];
+	DIR *dir;
+	struct dirent *dent;
+
+	strlcpy(base, "/sys/block", sizeof(base));
+
+	dir = opendir(base);
+	if (dir != NULL) {
+		for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
+			char dirname[PATH_SIZE];
+			DIR *dir2;
+			struct dirent *dent2;
+
+			if (dent->d_name[0] == '.')
+				continue;
+
+			strlcpy(dirname, base, sizeof(dirname));
+			strlcat(dirname, "/", sizeof(dirname));
+			strlcat(dirname, dent->d_name, sizeof(dirname));
+			if (device_list_insert(dirname) != 0)
+				continue;
+
+			/* look for partitions */
+			dir2 = opendir(dirname);
+			if (dir2 != NULL) {
+				for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
+					char dirname2[PATH_SIZE];
+
+					if (dent2->d_name[0] == '.')
+						continue;
+
+					if (!strcmp(dent2->d_name,"device"))
+						continue;
+
+					strlcpy(dirname2, dirname, sizeof(dirname2));
+					strlcat(dirname2, "/", sizeof(dirname2));
+					strlcat(dirname2, dent2->d_name, sizeof(dirname2));
+					device_list_insert(dirname2);
+				}
+				closedir(dir2);
+			}
+		}
+		closedir(dir);
+	}
+}
+
+static void scan_class(void)
+{
+	char base[PATH_SIZE];
+	DIR *dir;
+	struct dirent *dent;
+
+	strlcpy(base, "/sys/class", sizeof(base));
+
+	dir = opendir(base);
+	if (dir != NULL) {
+		for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
+			char dirname[PATH_SIZE];
+			DIR *dir2;
+			struct dirent *dent2;
+
+			if (dent->d_name[0] == '.')
+				continue;
+
+			strlcpy(dirname, base, sizeof(dirname));
+			strlcat(dirname, "/", sizeof(dirname));
+			strlcat(dirname, dent->d_name, sizeof(dirname));
+			dir2 = opendir(dirname);
+			if (dir2 != NULL) {
+				for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
+					char dirname2[PATH_SIZE];
+
+					if (dent2->d_name[0] == '.')
+						continue;
+
+					if (!strcmp(dent2->d_name, "device"))
+						continue;
+
+					strlcpy(dirname2, dirname, sizeof(dirname2));
+					strlcat(dirname2, "/", sizeof(dirname2));
+					strlcat(dirname2, dent2->d_name, sizeof(dirname2));
+					device_list_insert(dirname2);
+				}
+				closedir(dir2);
+			}
+		}
+		closedir(dir);
+	}
+}
+
+int main(int argc, char *argv[], char *envp[])
+{
+	char base[PATH_SIZE];
+	struct stat statbuf;
+	int failed = 0;
+	int option;
+
+	openlog("udevtrigger", LOG_PID | LOG_CONS, LOG_DAEMON);
+
+	while (1) {
+		option = getopt(argc, argv, "vnh");
+		if (option == -1)
+			break;
+
+		switch (option) {
+		case 'v':
+			verbose = 1;
+			break;
+		case 'n':
+			dry_run = 1;
+			break;
+		case 'h':
+			printf("Usage: udevtrigger OPTIONS\n"
+			       "  -v                     print the list of devices while running\n"
+			       "  -n                     do not actually trigger the events\n"
+			       "  -h                     print this text\n"
+			       "\n");
+			goto exit;
+		default:
+			goto exit;
+		}
+	}
+
+
+	/* if we have /sys/subsystem, forget all the old stuff */
+	scan_subsystem("bus");
+	scan_class();
+
+	/* scan "block" if it isn't a "class" */
+	strlcpy(base, "/sys/class/block", sizeof(base));
+	if (stat(base, &statbuf) != 0)
+		scan_block();
+
+exit:
+
+	closelog();
+	return 0;
+}

package/udevtrigger/Makefile

@@ -1,44 +0,0 @@
-#
-# Copyright (C) 2006-2008 OpenWrt.org
-#
-# This is free software, licensed under the GNU General Public License v2.
-# See /LICENSE for more information.
-#
-
-include $(TOPDIR)/rules.mk
-
-PKG_NAME:=udevtrigger
-PKG_VERSION:=106
-PKG_RELEASE:=1
-
-PKG_SOURCE:=udev-$(PKG_VERSION).tar.bz2
-PKG_SOURCE_URL:=@KERNEL/linux/utils/kernel/hotplug/
-PKG_MD5SUM:=320ccd2d0f4540d10e021bafa14f8985
-
-PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)/udev-$(PKG_VERSION)
-
-include $(INCLUDE_DIR)/package.mk
-
-define Package/udevtrigger
-  SECTION:=base
-  CATEGORY:=Base system
-  TITLE:=Small utility to request kernel devices events for coldplug
-  URL:=http://www.kernel.org/pub/linux/utils/kernel/hotplug/udev.html
-  MAINTAINER:=Geoff Levand <geoffrey.levand@am.sony.com>
-endef
-
-define Build/Compile
-	$(MAKE) -C $(PKG_BUILD_DIR) \
-		CROSS_COMPILE="$(TARGET_CROSS)" \
-		STRIP="/bin/true" \
-		DESTDIR="$(PKG_INSTALL_DIR)" \
-		OPTFLAGS="$(TARGET_CFLAGS)" \
- 		udevtrigger
-endef
-
-define Package/udevtrigger/install
-	$(INSTALL_DIR) $(1)/sbin
-	$(INSTALL_BIN) $(PKG_BUILD_DIR)/udevtrigger $(1)/sbin/
-endef
-
-$(eval $(call BuildPackage,udevtrigger))

package/udevtrigger/patches/001-no_debug.patch

@@ -1,20 +0,0 @@
---- a/Makefile
-+++ b/Makefile
-@@ -113,7 +113,7 @@ LD = $(CROSS_COMPILE)gcc
- AR = $(CROSS_COMPILE)ar
- RANLIB = $(CROSS_COMPILE)ranlib
- 
--CFLAGS		= -g -Wall -pipe -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64
-+CFLAGS		= -Wall -pipe -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64
- WARNINGS	= -Wstrict-prototypes -Wsign-compare -Wshadow \
- 		  -Wchar-subscripts -Wmissing-declarations -Wnested-externs \
- 		  -Wpointer-arith -Wcast-align -Wsign-compare -Wmissing-prototypes
-@@ -130,7 +130,7 @@ endif
- 
- # if DEBUG is enabled, then we do not strip
- ifeq ($(strip $(DEBUG)),true)
--	CFLAGS  += -DDEBUG
-+	CFLAGS  += -g -DDEBUG
- endif
- 
- ifeq ($(strip $(USE_GCOV)),true)

package/udevtrigger/patches/002-udevtrigger_no_config.patch

@@ -1,10 +0,0 @@
---- a/udevtrigger.c
-+++ b/udevtrigger.c
-@@ -446,7 +446,6 @@ int main(int argc, char *argv[], char *e
- 	};
- 
- 	logging_init("udevtrigger");
--	udev_config_init();
- 	dbg("version %s", UDEV_VERSION);
- 	sysfs_init();
-