udevtest: add --force mode

udev_db.c

@@ -286,6 +286,9 @@ int udev_db_delete_device(struct udevice *udev)
 	char filename[PATH_SIZE];
 	struct name_entry *name_loop;
 
+	if (udev->test_run)
+		return 0;
+
 	devpath_to_db_path(udev->dev->devpath, filename, sizeof(filename));
 	unlink(filename);
 

udev_device.c

@@ -164,6 +164,7 @@ int udev_device_event(struct udev_rules *rules, struct udevice *udev)
 		/* read current database entry; cleanup, if it is known device */
 		udev_old = udev_device_init(NULL);
 		if (udev_old != NULL) {
+			udev_old->test_run = udev->test_run;
 			if (udev_db_get_device(udev_old, udev->dev->devpath) == 0) {
 				info("device '%s' already in database, cleanup", udev->dev->devpath);
 				udev_db_delete_device(udev_old);

udev_node.c

@@ -153,7 +153,7 @@ static int update_link(struct udevice *udev, const char *name)
 	count = udev_db_get_devices_by_name(name, &name_list);
 	info("found %i devices with name '%s'", count, name);
 
-	/* if we don't have any reference, we can delete the link */
+	/* if we don't have a reference, delete it */
 	if (count <= 0) {
 		info("no reference left, remove '%s'", name);
 		if (!udev->test_run) {
@@ -236,11 +236,10 @@ void udev_node_update_symlinks(struct udevice *udev, struct udevice *udev_old)
 	if (udev_old != NULL) {
 		struct name_entry *link_loop;
 		struct name_entry *link_old_loop;
-		struct name_entry *link_old_tmp_loop;
 		int found;
 
 		/* remove current symlinks from old list */
-		list_for_each_entry_safe(link_old_loop, link_old_tmp_loop, &udev_old->symlink_list, node) {
+		list_for_each_entry(link_old_loop, &udev_old->symlink_list, node) {
 			found = 0;
 			list_for_each_entry(link_loop, &udev->symlink_list, node) {
 				if (strcmp(link_old_loop->name, link_loop->name) == 0) {
@@ -256,8 +255,12 @@ void udev_node_update_symlinks(struct udevice *udev, struct udevice *udev_old)
 			}
 		}
 
-		/* the old node is gone, maybe we have a device with a symlink now */
-		update_link(udev, udev_old->name);
+		/*
+		 * if the node name has changed, delete the node,
+		 * or possibly restore a symlink of another device
+		 */
+		if (strcmp(udev->name, udev_old->name) != 0)
+			update_link(udev, udev_old->name);
 	}
 }
 
@@ -345,7 +348,7 @@ int udev_node_remove(struct udevice *udev)
 	char filename[PATH_SIZE];
 	char partitionname[PATH_SIZE];
 	struct stat stats;
-	int retval;
+	int retval = 0;
 	int num;
 
 	strlcpy(filename, udev_root, sizeof(filename));
@@ -361,7 +364,8 @@ int udev_node_remove(struct udevice *udev)
 	}
 
 	info("removing device node '%s'", filename);
-	retval = unlink_secure(filename);
+	if (!udev->test_run)
+		retval = unlink_secure(filename);
 	if (retval)
 		return retval;
 
@@ -376,7 +380,8 @@ int udev_node_remove(struct udevice *udev)
 		for (i = 1; i <= num; i++) {
 			snprintf(partitionname, sizeof(partitionname), "%s%d", filename, i);
 			partitionname[sizeof(partitionname)-1] = '\0';
-			unlink_secure(partitionname);
+			if (!udev->test_run)
+				unlink_secure(partitionname);
 		}
 	}
 	delete_path(filename);

udevtest.c

@@ -26,6 +26,7 @@
 #include <ctype.h>
 #include <signal.h>
 #include <syslog.h>
+#include <getopt.h>
 
 #include "udev.h"
 #include "udev_rules.h"
@@ -49,14 +50,22 @@ void log_message (int priority, const char *format, ...)
 
 int main(int argc, char *argv[], char *envp[])
 {
+	int force = 0;
+	char *action = "add";
 	struct udev_rules rules = {};
 	char *devpath = NULL;
 	struct udevice *udev;
 	struct sysfs_device *dev;
-	int i;
 	int retval;
 	int rc = 0;
 
+	static const struct option options[] = {
+		{ "action", 1, NULL, 'a' },
+		{ "force", 0, NULL, 'f' },
+		{ "help", 0, NULL, 'h' },
+		{}
+	};
+
 	info("version %s", UDEV_VERSION);
 	udev_config_init();
 	if (udev_log_priority < LOG_INFO) {
@@ -67,15 +76,32 @@ int main(int argc, char *argv[], char *envp[])
 		setenv("UDEV_LOG", priority, 1);
 	}
 
-	for (i = 1 ; i < argc; i++) {
-		char *arg = argv[i];
+	while (1) {
+		int option;
 
-		if (strcmp(arg, "--help") == 0 || strcmp(arg, "-h") == 0) {
-			printf("Usage: udevtest [--help] <devpath>\n");
-			goto exit;
-		} else
-			devpath = arg;
+		option = getopt_long(argc, argv, "a:fh", options, NULL);
+		if (option == -1)
+			break;
+
+		dbg("option '%c'", option);
+		switch (option) {
+		case 'a':
+			action = optarg;
+			break;
+		case 'f':
+			force = 1;
+			break;
+		case 'h':
+			printf("Usage: udevtest [--action=<string>] [--force] [--help] <devpath>\n"
+			       "  --action=<string>   set action string\n"
+			       "  --force             don't skip node/link creation\n"
+			       "  --help              print this help text\n\n");
+			exit(0);
+		default:
+			exit(1);
+		}
 	}
+	devpath = argv[optind];
 
 	if (devpath == NULL) {
 		fprintf(stderr, "devpath parameter missing\n");
@@ -106,19 +132,20 @@ int main(int argc, char *argv[], char *envp[])
 
 	/* override built-in sysfs device */
 	udev->dev = dev;
-	strcpy(udev->action, "add");
+	strcpy(udev->action, action);
 	udev->devt = udev_device_get_devt(udev);
 
 	/* simulate node creation with test flag */
-	udev->test_run = 1;
+	if (!force)
+		udev->test_run = 1;
 
 	setenv("DEVPATH", udev->dev->devpath, 1);
 	setenv("SUBSYSTEM", udev->dev->subsystem, 1);
 	setenv("ACTION", "add", 1);
 
-	printf("This program is for debugging only, it does not create any node,\n"
-	       "or run any program specified by a RUN key. It may show incorrect results,\n"
-	       "if rules match against subsystem specfic kernel event variables.\n"
+	printf("This program is for debugging only, it does not run any program,\n"
+	       "specified by a RUN key. It may show incorrect results, if rules\n"
+	       "match against subsystem specfic kernel event variables.\n"
 	       "\n");
 
 	info("looking at device '%s' from subsystem '%s'", udev->dev->devpath, udev->dev->subsystem);