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| -rw-r--r-- | miscutils/ubirename.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/miscutils/ubirename.c b/miscutils/ubirename.c new file mode 100644 index 0000000..455a494 --- /dev/null +++ b/miscutils/ubirename.c @@ -0,0 +1,111 @@ +/* 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; +} |