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-rw-r--r--libudev/libudev-device-db-write.c138
1 files changed, 138 insertions, 0 deletions
diff --git a/libudev/libudev-device-db-write.c b/libudev/libudev-device-db-write.c
new file mode 100644
index 0000000000..a8e66f7884
--- /dev/null
+++ b/libudev/libudev-device-db-write.c
@@ -0,0 +1,138 @@
+/*
+ * libudev - interface to udev device information
+ *
+ * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * This library 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.
+ */
+
+#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)
+{
+ char *s;
+ size_t l;
+
+ s = filename;
+ l = util_strpcpyl(&s, len, udev_get_dev_path(udev), "/.udev/db/", NULL);
+ return util_path_encode(devpath, s, l);
+}
+
+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;
+ char *s;
+ size_t l;
+ struct udev_list_entry *list_entry;
+ int ret;
+
+ devpath_to_db_path(udev, udev_device_get_devpath(udev_device), filename, sizeof(filename));
+ util_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) != 0)
+ goto file;
+ if (udev_device_get_ignore_remove(udev_device))
+ goto file;
+ if (udev_device_get_devlink_priority(udev_device) != 0)
+ goto file;
+ if (udev_device_get_event_timeout(udev_device) >= 0)
+ goto file;
+ if (udev_device_get_watch_handle(udev_device) >= 0)
+ goto file;
+ if (udev_device_get_devnode(udev_device) == NULL)
+ goto out;
+
+ /*
+ * if we have only the node and symlinks to store, try not to waste
+ * tmpfs memory -- store values, if they fit, in a symlink target
+ */
+ s = target;
+ l = util_strpcpy(&s, sizeof(target), &udev_device_get_devnode(udev_device)[devlen]);
+ udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device)) {
+ l = util_strpcpyl(&s, l, " ", &udev_list_entry_get_name(list_entry)[devlen], NULL);
+ if (l == 0) {
+ 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);
+
+ if (udev_device_get_devnode(udev_device) != NULL) {
+ 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));
+ if (udev_device_get_watch_handle(udev_device) >= 0)
+ fprintf(f, "W:%u\n", udev_device_get_watch_handle(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)
+{
+ struct udev *udev = udev_device_get_udev(udev_device);
+ char filename[UTIL_PATH_SIZE];
+
+ devpath_to_db_path(udev, 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)
+{
+ struct udev *udev = udev_device_get_udev(udev_device);
+ char filename_old[UTIL_PATH_SIZE];
+ char filename[UTIL_PATH_SIZE];
+
+ devpath_to_db_path(udev, devpath_old, filename_old, sizeof(filename_old));
+ devpath_to_db_path(udev, udev_device_get_devpath(udev_device), filename, sizeof(filename));
+ return rename(filename_old, filename);
+}