move /dev/.udev/ to /dev/.run/udev/ and convert old udev database at udevd startup

1 files changed, 97 insertions, 1 deletions

diff --git a/udev/udevd.c b/udev/udevd.c
index aa2e3657f0..fe0e3c3929 100644
--- a/udev/udevd.c
+++ b/udev/udevd.c
@@ -971,6 +971,99 @@ static int mem_size_mb(void)
 	return memsize;
 }
 
+static int convert_db(struct udev *udev)
+{
+	char filename[UTIL_PATH_SIZE];
+	FILE *f;
+	struct udev_enumerate *udev_enumerate;
+	struct udev_list_entry *list_entry;
+
+	/* current database */
+	util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.run/udev/db3", NULL);
+	if (access(filename, F_OK) >= 0)
+		return 0;
+
+	/* make sure we do not get here again */
+	util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.run/udev/db3/", NULL);
+	util_create_path(udev, filename);
+
+	/* old database */
+	util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/db", NULL);
+	if (access(filename, F_OK) < 0)
+		return 0;
+
+	f = fopen("/dev/kmsg", "w");
+	if (f != NULL) {
+		fprintf(f, "<6>udev[%u]: converting old udev database\n", getpid());
+		fclose(f);
+	}
+
+	udev_enumerate = udev_enumerate_new(udev);
+	if (udev_enumerate == NULL)
+		return -1;
+	udev_enumerate_scan_devices(udev_enumerate);
+	udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(udev_enumerate)) {
+		struct udev_device *device;
+
+		device = udev_device_new_from_syspath(udev, udev_list_entry_get_name(list_entry));
+		if (device == NULL)
+			continue;
+
+		/* try to find the old database for devices without a current one */
+		if (udev_device_read_db(device, NULL) < 0) {
+			bool have_db;
+			const char *id;
+			struct stat stats;
+			char devpath[UTIL_PATH_SIZE];
+			char from[UTIL_PATH_SIZE];
+
+			have_db = false;
+
+			/* 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);
+			if (lstat(from, &stats) == 0) {
+				if (!have_db) {
+					udev_device_read_db(device, from);
+					have_db = true;
+				}
+				unlink(from);
+			}
+
+			/* 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);
+			if (lstat(from, &stats) == 0) {
+				if (!have_db) {
+					udev_device_read_db(device, from);
+					have_db = true;
+				}
+				unlink(from);
+			}
+
+			/* 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);
+			if (lstat(from, &stats) == 0) {
+				if (!have_db) {
+					udev_device_read_db(device, from);
+					have_db = true;
+				}
+				unlink(from);
+			}
+
+			/* write out new database */
+			if (have_db)
+				udev_device_update_db(device);
+		}
+		udev_device_unref(device);
+	}
+	udev_enumerate_unref(udev_enumerate);
+	return 0;
+}
+
 int main(int argc, char *argv[])
 {
 	struct udev *udev;
@@ -1159,7 +1252,7 @@ int main(int argc, char *argv[])
 				  IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
 
 		/* watch dynamic rules directory */
-		util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/rules.d", NULL);
+		util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.run/udev/rules.d", NULL);
 		if (stat(filename, &statbuf) != 0) {
 			util_create_path(udev, filename);
 			udev_selinux_setfscreatecon(udev, filename, S_IFDIR|0755);
@@ -1203,6 +1296,9 @@ int main(int argc, char *argv[])
 		goto exit;
 	}
 
+	/* if needed, convert old database from earlier udev version */
+	convert_db(udev);
+
 	if (!debug) {
 		dup2(fd, STDIN_FILENO);
 		dup2(fd, STDOUT_FILENO);