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