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authorSven Eisenberg <sven.eisenberg@novero.com>2016-04-03 20:12:03 +0200
committerDenys Vlasenko <vda.linux@googlemail.com>2016-04-03 20:12:03 +0200
commitcb9264099822505dc2930cfea0b1f9027a02dc06 (patch)
treea7dd9147a69dc4ed608067ac5036ee75c0ab43bc
parent46b494635e6ef54e282749d2c65dd1922b167931 (diff)
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ubirename: new applet
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>
-rw-r--r--miscutils/ubirename.c111
1 files changed, 111 insertions, 0 deletions
diff --git a/miscutils/ubirename.c b/miscutils/ubirename.c
new file mode 100644
index 000000000..455a49485
--- /dev/null
+++ b/miscutils/ubirename.c
@@ -0,0 +1,111 @@
1/* ubirename - port of the ubirename from the mtd-utils package
2 *
3 * A utility to rename one UBI volume.
4 *
5 * 2016-03-01 Sven Eisenberg <sven.eisenberg@novero.com>
6 *
7 * Licensed under GPLv2, see file LICENSE in this source tree.
8 */
9//config:config UBIRENAME
10//config: bool "ubirename"
11//config: default y
12//config: select PLATFORM_LINUX
13//config: help
14//config: Utility to rename UBI volumes
15
16//applet:IF_UBIRENAME(APPLET(ubirename, BB_DIR_USR_SBIN, BB_SUID_DROP))
17
18//kbuild:lib-$(CONFIG_UBIRENAME) += ubirename.o
19
20//usage:#define ubirename_trivial_usage
21//usage: "UBI_DEVICE OLD_VOLNAME NEW_VOLNAME [OLD2 NEW2]..."
22//usage:#define ubirename_full_usage "\n\n"
23//usage: "Rename UBI volumes on UBI_DEVICE"
24
25#include "libbb.h"
26#include <mtd/mtd-user.h>
27
28#ifndef __packed
29# define __packed __attribute__((packed))
30#endif
31
32// from ubi-media.h
33#define UBI_VOL_NAME_MAX 127
34#define UBI_MAX_VOLUMES 128
35// end ubi-media.h
36
37#define UBI_MAX_VOLUME_NAME UBI_VOL_NAME_MAX
38
39// from ubi-user.h
40/* ioctl commands of UBI character devices */
41#define UBI_IOC_MAGIC 'o'
42
43/* Re-name volumes */
44#define UBI_IOCRNVOL _IOW(UBI_IOC_MAGIC, 3, struct ubi_rnvol_req)
45
46/* Maximum amount of UBI volumes that can be re-named at one go */
47#define UBI_MAX_RNVOL 32
48
49struct ubi_rnvol_req {
50 int32_t count;
51 int8_t padding1[12];
52 struct {
53 int32_t vol_id;
54 int16_t name_len;
55 int8_t padding2[2];
56 char name[UBI_MAX_VOLUME_NAME + 1];
57 } ents[UBI_MAX_RNVOL];
58} __packed;
59// end ubi-user.h
60
61int ubirename_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
62int ubirename_main(int argc, char **argv)
63{
64 struct ubi_rnvol_req *rnvol;
65 const char *ubi_devname;
66 unsigned ubi_devnum;
67 unsigned i, n;
68
69 /* argc can be 4, 6, 8, ... */
70 if ((argc & 1) || (argc >>= 1) < 2)
71 bb_show_usage();
72
73 rnvol = xzalloc(sizeof(*rnvol));
74 rnvol->count = --argc;
75 if (argc > ARRAY_SIZE(rnvol->ents))
76 bb_error_msg_and_die("too many renames requested");
77
78 ubi_devname = argv[1];
79 if (sscanf(ubi_devname, "/dev/ubi%u", &ubi_devnum) != 1)
80 bb_error_msg_and_die("not a ubi device: '%s'", ubi_devname);
81
82 n = 0;
83 argv += 2;
84 while (argv[0]) {
85 for (i = 0; i < UBI_MAX_VOLUMES; i++) {
86 char buf[UBI_VOL_NAME_MAX + 1];
87 char fname[sizeof("/sys/class/ubi/ubi%u_%u/name") + 2 * sizeof(int)*3];
88
89 sprintf(fname, "/sys/class/ubi/ubi%u_%u/name", ubi_devnum, i);
90 if (open_read_close(fname, buf, sizeof(buf)) <= 0)
91 continue;
92
93 strchrnul(buf, '\n')[0] = '\0';
94 if (strcmp(buf, argv[0]) == 0)
95 goto found;
96 }
97 bb_error_msg_and_die("no volume '%s' found", argv[0]);
98 found:
99 rnvol->ents[n].vol_id = i;
100 rnvol->ents[n].name_len = strlen(argv[1]);
101 if (rnvol->ents[n].name_len >= sizeof(rnvol->ents[n].name))
102 bb_error_msg_and_die("new name '%s' is too long", argv[1]);
103 strcpy(rnvol->ents[n].name, argv[1]);
104 n++;
105 argv += 2;
106 }
107
108 xioctl(xopen(ubi_devname, O_RDONLY), UBI_IOCRNVOL, rnvol);
109
110 return 0;
111}