#ifdef CONFIG_MD5SUM
APPLET(md5sum, md5sum_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
#endif
+#ifdef CONFIG_MDEV
+ APPLET(mdev, mdev_main, _BB_DIR_SBIN, _BB_SUID_NEVER)
+#endif
#ifdef CONFIG_MESG
APPLET(mesg, mesg_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
#endif
"busybox: OK\n" \
"^D\n"
+#define mdev_trivial_usage \
+ "[-s]"
+#define mdev_full_usage \
+ "\ts\tScan /sys and populate /dev during system boot\n\n" \
+ "Called with no options (via hotplug) it uses environment variables\n" \
+ "to determine which device to add/remove."
+#ifdef CONFIG_FEATURE_MDEV_CONFIG
+#define mdev_notes_usage \
+ "The mdev config file contains lines that look like:\n" \
+ " hd[a-z][0-9]* 0:3 660\n\n" \
+ "That's device name (with regex match), uid:gid, and permissions.\n\n" \
+ "Optionally, that can be followed (on the same line) by an asterisk\n" \
+ "and a command line to run after creating the corresponding device(s),\n"\
+ "ala:\n\n" \
+ " hdc root:cdrom 660 *ln -s hdc cdrom\n\n" \
+ "Config file parsing stops on the first matching line. If no config\n"\
+ "entry is matched, devices are created with default 0:0 660. (Make\n"\
+ "the last line match .* to override this.)\n\n"
+#endif
+
#define mesg_trivial_usage \
"[y|n]"
#define mesg_full_usage \
"\t-a\tStart swapping on all swap devices"
#define switch_root_trivial_usage \
- "NEW_ROOT NEW_INIT [ARGUMENTS_TO_INIT]"
+ "[-c /dev/console] NEW_ROOT NEW_INIT [ARGUMENTS_TO_INIT]"
#define switch_root_full_usage \
"Use from PID 1 under initramfs to free initramfs, chroot to NEW_ROOT,\n" \
- "and exec NEW_INIT.\n"
+ "and exec NEW_INIT.\n\n" \
+ "Options:\n" \
+ "\t-c\tRedirect console to device on new root"
#define sync_trivial_usage \
""
file or block device, and to query the status of a loop device. This
version does not currently support enabling data encryption.
+config CONFIG_MDEV
+ bool "mdev"
+ default n
+ help
+ mdev is a mini-udev implementation: call it with -s to populate
+ /dev from /sys, then "echo /sbin/mdev > /sys/kernel/hotplug" to
+ have it handle hotplug events afterwards. Device names are taken
+ from sysfs.
+
+config CONFIG_FEATURE_MDEV_CONFIG
+ bool " Support /etc/mdev.conf"
+ default n
+ depends on CONFIG_MDEV
+ help
+ The mdev config file contains lines that look like:
+
+ hd[a-z][0-9]* 0:3 660
+
+ That's device name (with regex match), uid:gid, and permissions.
+
+ Optionally, that can be followed (on the same line) by an asterisk
+ and a command line to run after creating the corresponding device(s),
+ ala:
+
+ hdc root:cdrom 660 *ln -s hdc cdrom
+
+ Config file parsing stops on the first matching line. If no config
+ entry is matched, devices are created with default 0:0 660. (Make
+ the last line match .* to override this.)
+
config CONFIG_MKSWAP
bool "mkswap"
default n
UTILLINUX-$(CONFIG_IPCRM) +=ipcrm.o
UTILLINUX-$(CONFIG_IPCS) +=ipcs.o
UTILLINUX-$(CONFIG_LOSETUP) +=losetup.o
+UTILLINUX-$(CONFIG_MDEV) +=mdev.o
UTILLINUX-$(CONFIG_MKFS_MINIX) +=mkfs_minix.o
UTILLINUX-$(CONFIG_MKSWAP) +=mkswap.o
UTILLINUX-$(CONFIG_MORE) +=more.o
UTILLINUX-$(CONFIG_MOUNT) +=mount.o
UTILLINUX-$(CONFIG_FEATURE_MOUNT_NFS) +=nfsmount.o
UTILLINUX-$(CONFIG_PIVOT_ROOT) +=pivot_root.o
+UTILLINUX-$(CONFIG_SWITCH_ROOT) +=switch_root.o
UTILLINUX-$(CONFIG_RDATE) +=rdate.o
UTILLINUX-$(CONFIG_READPROFILE) +=readprofile.o
UTILLINUX-$(CONFIG_SWAPONOFF) +=swaponoff.o
--- /dev/null
+/* vi:set ts=4:
+ *
+ * mdev - Mini udev for busybox
+ *
+ * Copyright 2005 Rob Landley <rob@landley.net>
+ * Copyright 2005 Frank Sorenson <frank@tuxrocks.com>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#define DEV_PATH "/dev"
+#define DEV_MODE 0660
+
+#include <busybox.h>
+
+/* mknod in /dev based on a path like "/sys/block/hda/hda1" */
+void make_device(char *path)
+{
+ char *device_name, *s;
+ int major,minor,type,len,fd;
+
+ RESERVE_CONFIG_BUFFER(temp,PATH_MAX);
+
+ /* Try to read major/minor string */
+
+ snprintf(temp, PATH_MAX, "%s/dev", path);
+ fd = open(temp, O_RDONLY);
+ len = read(fd, temp, PATH_MAX-1);
+ if (len<1) goto end;
+ temp[len] = 0;
+ close(fd);
+
+ /* Determine device name, type, major and minor */
+
+ device_name = strrchr(path, '/') + 1;
+ type = strncmp(path+5, "block/" ,6) ? S_IFCHR : S_IFBLK;
+ major = minor = 0;
+ for(s = temp; *s; s++) {
+ if(*s == ':') {
+ major = minor;
+ minor = 0;
+ } else {
+ minor *= 10;
+ minor += (*s) - '0';
+ }
+ }
+
+/* Open config file here, look up permissions */
+
+ sprintf(temp, "%s/%s", DEV_PATH, device_name);
+ if(mknod(temp, DEV_MODE | type, makedev(major, minor)) && errno != EEXIST)
+ bb_perror_msg_and_die("mknod %s failed", temp);
+
+/* Perform shellout here */
+
+end:
+ RELEASE_CONFIG_BUFFER(temp);
+}
+
+/* Recursive search of /sys/block or /sys/class. path must be a writeable
+ * buffer of size PATH_MAX containing the directory string to start at. */
+
+void find_dev(char *path)
+{
+ DIR *dir;
+ int len=strlen(path);
+
+ if(!(dir = opendir(path)))
+ bb_perror_msg_and_die("No %s",path);
+
+ for(;;) {
+ struct dirent *entry = readdir(dir);
+
+ if(!entry) break;
+
+ /* Skip "." and ".." (also skips hidden files, which is ok) */
+
+ if (entry->d_name[0]=='.') continue;
+
+ if (entry->d_type == DT_DIR) {
+ snprintf(path+len, PATH_MAX-len, "/%s", entry->d_name);
+ find_dev(path);
+ path[len] = 0;
+ }
+
+ /* If there's a dev entry, mknod it */
+
+ if (strcmp(entry->d_name, "dev")) make_device(path);
+ }
+
+ closedir(dir);
+}
+
+int mdev_main(int argc, char *argv[])
+{
+ if (argc > 1) {
+ if(argc == 2 && !strcmp(argv[1],"-s")) {
+ RESERVE_CONFIG_BUFFER(temp,PATH_MAX);
+ strcpy(temp,"/sys/block");
+ find_dev(temp);
+ strcpy(temp,"/sys/class");
+ find_dev(temp);
+ if(ENABLE_FEATURE_CLEAN_UP)
+ RELEASE_CONFIG_BUFFER(temp);
+ return 0;
+ } else bb_show_usage();
+ }
+
+/* hotplug support goes here */
+
+ return 0;
+}
projects / oweals / busybox.git / commitdiff