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https://github.com/systemd/systemd-stable.git
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[PATCH] udev - advanced user query options
This patch improves the user options for udev. It is possible now to query for the name, the symlinks or owner/group. If asked for the name of the node we are able to prepend the udev_root with the -r option. SAMPLE: kay@pim:~/src/udev.test$ ./udev -V udev, version 012_bk kay@pim:~/src/udev.test$ ./udev -h Usage: [-qrVh] -q <name> query database for the specified value -p <path> device path used for query -r print udev root -V print udev version -h print this help text kay@pim:~/src/udev.test$ ./udev -r /udev/ kay@pim:~/src/udev.test$ ./udev -q name -p /class/video4linux/video0 video/webcam0 kay@pim:~/src/udev.test$ ./udev -q symlink -p /class/video4linux/video0 camera0 kamera0 kay@pim:~/src/udev.test$ ./udev -q owner -p /class/video4linux/video0 501 kay@pim:~/src/udev.test$ ./udev -r -q name -p /class/video4linux/video0 /udev/video/webcam0
This commit is contained in:
parent
606143c8d2
commit
5472beeea5
109
udev.c
109
udev.c
@ -82,13 +82,26 @@ static inline char *get_seqnum(void)
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return seqnum;
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}
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enum query_type {
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NONE,
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NAME,
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SYMLINK,
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OWNER,
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GROUP
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};
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static inline int udev_user(int argc, char **argv)
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{
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static const char short_options[] = "q:rVh";
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static const char short_options[] = "p:q:rVh";
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int option;
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int retval = -EINVAL;
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struct udevice dev;
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int root = 0;
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enum query_type query = NONE;
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char result[NAME_SIZE] = "";
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char path[NAME_SIZE] = "";
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/* get command line options */
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while (1) {
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option = getopt(argc, argv, short_options);
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if (option == -1)
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@ -96,25 +109,40 @@ static inline int udev_user(int argc, char **argv)
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dbg("option '%c'", option);
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switch (option) {
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case 'p':
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dbg("udev path: %s\n", optarg);
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strfieldcpy(path, optarg);
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break;
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case 'q':
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dbg("udev query: %s\n", optarg);
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retval = udevdb_open_ro();
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if (retval != 0) {
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printf("unable to open udev database\n");
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return -1;
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if (strcmp(optarg, "name") == 0) {
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query = NAME;
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break;
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}
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retval = udevdb_get_dev(optarg, &dev);
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if (retval == 0) {
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printf("%s\n", dev.name);
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} else {
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printf("device not found in udev database\n");
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if (strcmp(optarg, "symlink") == 0) {
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query = SYMLINK;
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break;
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}
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udevdb_exit();
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return retval;
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if (strcmp(optarg, "owner") == 0) {
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query = OWNER;
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break;
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}
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if (strcmp(optarg, "group") == 0) {
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query = GROUP;
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break;
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}
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printf("unknown query type\n");
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return -EINVAL;
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case 'r':
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printf("%s\n", udev_root);
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return 0;
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root = 1;
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break;
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case 'V':
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printf("udev, version %s\n", UDEV_VERSION);
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@ -128,14 +156,63 @@ static inline int udev_user(int argc, char **argv)
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}
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}
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/* process options */
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if (query != NONE) {
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if (path[0] == '\0') {
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printf("query needs device path specified\n");
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return -EINVAL;
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}
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retval = udevdb_open_ro();
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if (retval != 0) {
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printf("unable to open udev database\n");
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return -EACCES;
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}
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retval = udevdb_get_dev(path, &dev);
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if (retval == 0) {
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switch(query) {
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case NAME:
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if (root)
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strfieldcpy(result, udev_root);
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strncat(result, dev.name, sizeof(result));
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break;
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case SYMLINK:
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strfieldcpy(result, dev.symlink);
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break;
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case GROUP:
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strfieldcpy(result, dev.group);
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break;
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case OWNER:
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strfieldcpy(result, dev.owner);
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break;
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default:
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break;
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}
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printf("%s\n", result);
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} else {
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printf("device not found in udev database\n");
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}
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udevdb_exit();
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return retval;
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}
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if (root) {
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printf("%s\n", udev_root);
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return 0;
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}
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help:
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printf("Usage: [-qrVh]\n"
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" -q <path> query database for the name of the created node\n"
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" -q <name> query database for the specified value\n"
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" -p <path> device path used for query\n"
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" -r print udev root\n"
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" -V print udev version\n"
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" -h print this help text\n"
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"\n");
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return retval;
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}
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