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>

diff --git a/miscutils/ubirename.c b/miscutils/ubirename.c
new file mode 100644 (file)
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;
+}