move udev_device_db to libudev

1 files changed, 135 insertions, 0 deletions

diff --git a/udev/lib/libudev-device-db-write.c b/udev/lib/libudev-device-db-write.c
new file mode 100644
index 0000000000..17e989310e
--- /dev/null
+++ b/udev/lib/libudev-device-db-write.c
@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * 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, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#include "udev.h"
+
+static size_t devpath_to_db_path(struct udev *udev, const char *devpath, char *filename, size_t len)
+{
+	size_t start;
+
+	/* translate to location of db file */
+	util_strlcpy(filename, udev_get_dev_path(udev), len);
+	start = util_strlcat(filename, "/.udev/db/", len);
+	util_strlcat(filename, devpath, len);
+	return util_path_encode(&filename[start], len - start);
+}
+
+int udev_device_update_db(struct udev_device *udev_device)
+{
+	struct udev *udev = udev_device_get_udev(udev_device);
+	char filename[UTIL_PATH_SIZE];
+	FILE *f;
+	char target[232]; /* on 64bit, tmpfs inlines up to 239 bytes */
+	size_t devlen = strlen(udev_get_dev_path(udev))+1;
+	struct udev_list_entry *list_entry;
+	int ret;
+
+	devpath_to_db_path(udev,
+			   udev_device_get_devpath(udev_device),
+			   filename, sizeof(filename));
+	create_path(udev, filename);
+	unlink(filename);
+
+	udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device))
+		if (udev_list_entry_get_flag(list_entry))
+			goto file;
+	if (udev_device_get_num_fake_partitions(udev_device))
+		goto file;
+	if (udev_device_get_ignore_remove(udev_device))
+		goto file;
+	/* try not to waste tmpfs memory; store values, if they fit, in a symlink target */
+	util_strlcpy(target, &udev_device_get_devnode(udev_device)[devlen], sizeof(target));
+	udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device)) {
+		size_t len;
+
+		util_strlcat(target, " ", sizeof(target));
+		len = util_strlcat(target, &udev_list_entry_get_name(list_entry)[devlen], sizeof(target));
+		if (len >= sizeof(target)) {
+			info(udev, "size of links too large, create file\n");
+			goto file;
+		}
+	}
+	info(udev, "create db link (%s)\n", target);
+	udev_selinux_setfscreatecon(udev, filename, S_IFLNK);
+	ret = symlink(target, filename);
+	udev_selinux_resetfscreatecon(udev);
+	if (ret == 0)
+		goto out;
+file:
+	f = fopen(filename, "w");
+	if (f == NULL) {
+		err(udev, "unable to create db file '%s': %m\n", filename);
+		return -1;
+		}
+	info(udev, "created db file for '%s' in '%s'\n", udev_device_get_devpath(udev_device), filename);
+
+	fprintf(f, "N:%s\n", &udev_device_get_devnode(udev_device)[devlen]);
+	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]);
+	if (udev_device_get_devlink_priority(udev_device) != 0)
+		fprintf(f, "L:%u\n", udev_device_get_devlink_priority(udev_device));
+	if (udev_device_get_event_timeout(udev_device) >= 0)
+		fprintf(f, "T:%u\n", udev_device_get_event_timeout(udev_device));
+	if (udev_device_get_num_fake_partitions(udev_device) != 0)
+		fprintf(f, "A:%u\n", udev_device_get_num_fake_partitions(udev_device));
+	if (udev_device_get_ignore_remove(udev_device))
+		fprintf(f, "R:%u\n", udev_device_get_ignore_remove(udev_device));
+	udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
+		if (!udev_list_entry_get_flag(list_entry))
+			continue;
+		fprintf(f, "E:%s=%s\n",
+			udev_list_entry_get_name(list_entry),
+			udev_list_entry_get_value(list_entry));
+	}
+	fclose(f);
+out:
+	return 0;
+}
+
+int udev_device_delete_db(struct udev_device *udev_device)
+{
+	char filename[UTIL_PATH_SIZE];
+
+	devpath_to_db_path(udev_device_get_udev(udev_device),
+			   udev_device_get_devpath(udev_device),
+			   filename, sizeof(filename));
+	unlink(filename);
+	return 0;
+}
+
+int udev_device_rename_db(struct udev_device *udev_device, const char *devpath_old)
+{
+	char filename_old[UTIL_PATH_SIZE];
+	char filename[UTIL_PATH_SIZE];
+
+	devpath_to_db_path(udev_device_get_udev(udev_device),
+			   devpath_old,
+			   filename_old, sizeof(filename_old));
+	devpath_to_db_path(udev_device_get_udev(udev_device),
+			   udev_device_get_devpath(udev_device),
+			   filename, sizeof(filename));
+	return rename(filename_old, filename);
+}