Package: uuid-runtime
Version: 1.41.6-1
Severity: wishlist
Hi,
Although, it is not very useful really [1], uuidgen could generate lvm uuids.
>From lvm2 source I take borrowed next code which generate a uuid, perhaps a
>'-l' switch in uuidgen could generate uuid
This file generate a executable who returns a valid lvm uuid ( I don't have
knowledge enough to integrate in uuid-runtime code ):
#include <assert.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
/* All code borrowed from lvm2 source */
#define ID_LEN 32
struct id {
int8_t uuid[ID_LEN];
};
static const char _c[] =
"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!#";
int read_urandom(void *buf, size_t len);
int read_urandom(void *buf, size_t len)
{
int fd;
/* FIXME: we should stat here, and handle other cases */
/* FIXME: use common _io() routine's open/read/close */
if ((fd = open("/dev/urandom", O_RDONLY)) < 0) {
printf ("fallo open, read_urandom: /dev/urandom");
return 0;
}
if (read(fd, buf, len) != (ssize_t) len) {
printf("fallo read, read_urandom: /dev/urandom");
close(fd);
return 0;
}
close(fd);
return 1;
}
int id_create(struct id *id)
{
unsigned i;
size_t len = sizeof(id->uuid);
memset(id->uuid, 0, len);
if (!read_urandom(&id->uuid, len)) {
return 0;
}
/*
* Skip out the last 2 chars in randomized creation for LVM1
* backwards compatibility.
*/
for (i = 0; i < len; i++)
id->uuid[i] = _c[id->uuid[i] % (sizeof(_c) - 3)];
return 1;
}
int id_write_format(const struct id *id, char *buffer, size_t size)
{
int i, tot;
static unsigned group_size[] = { 6, 4, 4, 4, 4, 4, 6 };
assert(ID_LEN == 32);
/* split into groups separated by dashes */
if (size < (32 + 6 + 1)) {
printf ("Couldn't write uuid, buffer too small.");
return 0;
}
for (i = 0, tot = 0; i < 7; i++) {
memcpy(buffer, id->uuid + tot, group_size[i]);
buffer += group_size[i];
tot += group_size[i];
*buffer++ = '-';
}
*--buffer = '\0';
return 1;
}
int main ()
{
struct id id;
char *uuid = malloc (50*sizeof (char));
id_create (&id);
id_write_format (&id,uuid,39);
printf ("%s\n",uuid);
}
Thank you very much
[1] http://www.nabble.com/Anyone-know-the-LVM-UUID-Format--td16906548.html
"Nobody has ever provided me with a satisfactory reason why an option for that
would be useful. It's the pair, VG + LV that matters, not the LV on its own. "
-- System Information:
Debian Release: squeeze/sid
APT prefers unstable
APT policy: (990, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)
Kernel: Linux 2.6.29-1-686 (SMP w/2 CPU cores)
Locale: LANG=es_ES.UTF-8, LC_CTYPE=es_ES.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages uuid-runtime depends on:
ii libc6 2.9-15 GNU C Library: Shared libraries
ii libuuid1 1.41.6-1 Universally Unique ID library
ii passwd 1:4.1.4.1-1 change and administer password and
uuid-runtime recommends no packages.
uuid-runtime suggests no packages.
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