add support for renaming/relocating device nodes
diff --git a/docs/mdev.txt b/docs/mdev.txt
index 4a4451b..38f1da9 100644
--- a/docs/mdev.txt
+++ b/docs/mdev.txt
@@ -53,6 +53,15 @@
create your own total match like so:
.* 1:1 777
+You can rename/relocate device nodes by using the next optional field.
+ <device regex> <uid>:<gid> <octal permissions> [>path]
+So if you want to place the device node into a subdirectory, make sure the path
+has a trailing /. If you want to rename the device node, just place the name.
+ hda 0:3 660 >drives/
+This will relocate "hda" into the drives/ subdirectory.
+ hdb 0:3 660 >cdrom
+This will rename "hdb" to "cdrom".
+
If you also enable support for executing your own commands, then the file has
the format:
<device regex> <uid>:<gid> <octal permissions> [<@|$|*> <command>]
diff --git a/util-linux/Config.in b/util-linux/Config.in
index 8ec466b..d236b77 100644
--- a/util-linux/Config.in
+++ b/util-linux/Config.in
@@ -301,6 +301,15 @@
For more information, please see docs/mdev.txt
+config FEATURE_MDEV_RENAME
+ bool "Support subdirs/symlinks"
+ default n
+ depends on FEATURE_MDEV_CONF
+ help
+ Add support for renaming devices and creating symlinks.
+
+ For more information, please see docs/mdev.txt
+
config FEATURE_MDEV_EXEC
bool "Support command execution at device addition/removal"
default n
diff --git a/util-linux/mdev.c b/util-linux/mdev.c
index 65b4da4..a18fc09 100644
--- a/util-linux/mdev.c
+++ b/util-linux/mdev.c
@@ -31,6 +31,10 @@
gid_t gid = 0;
char *temp = path + strlen(path);
char *command = NULL;
+ char *alias = NULL;
+
+ /* Force the configuration file settings exactly. */
+ umask(0);
/* Try to read major/minor string. Note that the kernel puts \n after
* the data, so we don't need to worry about null terminating the string
@@ -70,7 +74,7 @@
++lineno;
/* Three fields: regex, uid:gid, mode */
- for (field = 0; field < (3 + ENABLE_FEATURE_MDEV_EXEC); ++field) {
+ for (field = 0; field < (3 + ENABLE_FEATURE_MDEV_RENAME + ENABLE_FEATURE_MDEV_EXEC); ++field) {
/* Find a non-empty field */
char *val;
@@ -131,7 +135,16 @@
/* Mode device permissions */
mode = strtoul(val, NULL, 8);
- } else if (ENABLE_FEATURE_MDEV_EXEC && field == 3) {
+ } else if (ENABLE_FEATURE_MDEV_RENAME && field == 3) {
+
+ if (*val != '>')
+ ++field;
+ else
+ alias = xstrdup(val + 1);
+
+ }
+
+ if (ENABLE_FEATURE_MDEV_EXEC && field == 3 + ENABLE_FEATURE_MDEV_RENAME) {
/* Optional command to run */
const char *s = "@$*";
@@ -167,20 +180,45 @@
end_parse: /* nothing */ ;
}
- umask(0);
if (!delete) {
if (sscanf(temp, "%d:%d", &major, &minor) != 2)
return;
+
+ if (ENABLE_FEATURE_MDEV_RENAME)
+ unlink(device_name);
+
if (mknod(device_name, mode | type, makedev(major, minor)) && errno != EEXIST)
bb_perror_msg_and_die("mknod %s", device_name);
if (major == root_major && minor == root_minor)
symlink(device_name, "root");
- if (ENABLE_FEATURE_MDEV_CONF)
+ if (ENABLE_FEATURE_MDEV_CONF) {
chown(device_name, uid, gid);
+
+ if (ENABLE_FEATURE_MDEV_RENAME && alias) {
+ char *dest;
+
+ temp = strrchr(alias, '/');
+ if (temp) {
+ if (temp[1] != '\0')
+ /* given a file name, so rename it */
+ *temp = '\0';
+ bb_make_directory(alias, 0755, FILEUTILS_RECUR);
+ dest = concat_path_file(alias, device_name);
+ } else
+ dest = alias;
+
+ rename(device_name, dest);
+ symlink(dest, device_name);
+
+ if (alias != dest)
+ free(alias);
+ free(dest);
+ }
+ }
}
- if (command) {
+ if (ENABLE_FEATURE_MDEV_EXEC && command) {
/* setenv will leak memory, so use putenv */
char *s = xasprintf("MDEV=%s", device_name);
putenv(s);