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ubirename: new applet

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function                                             old     new   delta
ubirename_main                                         -     394    +394
packed_usage                                       30611   30674     +63
applet_names                                        2530    2540     +10

Signed-off-by: Sven Eisenberg <sven.eisenberg@novero.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Sven Eisenberg 2016-04-03 20:12:03 +02:00 committed by Denys Vlasenko
parent 46b494635e
commit cb92640998
1 changed files with 111 additions and 0 deletions
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111
miscutils/ubirename.c Normal file
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/* ubirename - port of the ubirename from the mtd-utils package
*
* A utility to rename one UBI volume.
*
* 2016-03-01 Sven Eisenberg <sven.eisenberg@novero.com>
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
//config:config UBIRENAME
//config: bool "ubirename"
//config: default y
//config: select PLATFORM_LINUX
//config: help
//config: Utility to rename UBI volumes
//applet:IF_UBIRENAME(APPLET(ubirename, BB_DIR_USR_SBIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_UBIRENAME) += ubirename.o
//usage:#define ubirename_trivial_usage
//usage: "UBI_DEVICE OLD_VOLNAME NEW_VOLNAME [OLD2 NEW2]..."
//usage:#define ubirename_full_usage "\n\n"
//usage: "Rename UBI volumes on UBI_DEVICE"
#include "libbb.h"
#include <mtd/mtd-user.h>
#ifndef __packed
# define __packed __attribute__((packed))
#endif
// from ubi-media.h
#define UBI_VOL_NAME_MAX 127
#define UBI_MAX_VOLUMES 128
// end ubi-media.h
#define UBI_MAX_VOLUME_NAME UBI_VOL_NAME_MAX
// from ubi-user.h
/* ioctl commands of UBI character devices */
#define UBI_IOC_MAGIC 'o'
/* Re-name volumes */
#define UBI_IOCRNVOL _IOW(UBI_IOC_MAGIC, 3, struct ubi_rnvol_req)
/* Maximum amount of UBI volumes that can be re-named at one go */
#define UBI_MAX_RNVOL 32
struct ubi_rnvol_req {
int32_t count;
int8_t padding1[12];
struct {
int32_t vol_id;
int16_t name_len;
int8_t padding2[2];
char name[UBI_MAX_VOLUME_NAME + 1];
} ents[UBI_MAX_RNVOL];
} __packed;
// end ubi-user.h
int ubirename_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ubirename_main(int argc, char **argv)
{
struct ubi_rnvol_req *rnvol;
const char *ubi_devname;
unsigned ubi_devnum;
unsigned i, n;
/* argc can be 4, 6, 8, ... */
if ((argc & 1) || (argc >>= 1) < 2)
bb_show_usage();
rnvol = xzalloc(sizeof(*rnvol));
rnvol->count = --argc;
if (argc > ARRAY_SIZE(rnvol->ents))
bb_error_msg_and_die("too many renames requested");
ubi_devname = argv[1];
if (sscanf(ubi_devname, "/dev/ubi%u", &ubi_devnum) != 1)
bb_error_msg_and_die("not a ubi device: '%s'", ubi_devname);
n = 0;
argv += 2;
while (argv[0]) {
for (i = 0; i < UBI_MAX_VOLUMES; i++) {
char buf[UBI_VOL_NAME_MAX + 1];
char fname[sizeof("/sys/class/ubi/ubi%u_%u/name") + 2 * sizeof(int)*3];
sprintf(fname, "/sys/class/ubi/ubi%u_%u/name", ubi_devnum, i);
if (open_read_close(fname, buf, sizeof(buf)) <= 0)
continue;
strchrnul(buf, '\n')[0] = '\0';
if (strcmp(buf, argv[0]) == 0)
goto found;
}
bb_error_msg_and_die("no volume '%s' found", argv[0]);
found:
rnvol->ents[n].vol_id = i;
rnvol->ents[n].name_len = strlen(argv[1]);
if (rnvol->ents[n].name_len >= sizeof(rnvol->ents[n].name))
bb_error_msg_and_die("new name '%s' is too long", argv[1]);
strcpy(rnvol->ents[n].name, argv[1]);
n++;
argv += 2;
}
xioctl(xopen(ubi_devname, O_RDONLY), UBI_IOCRNVOL, rnvol);
return 0;
}