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#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <linux/types.h>
#include <uuid/uuid.h>
struct fsuuid2 {
__u8 len;
__u8 uuid[16];
};
#define FS_IOC_GETFSUUID _IOR(0x15, 0, struct fsuuid2)
void die(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
fputc('\n', stderr);
_exit(EXIT_FAILURE);
}
int main(int argc, char *argv[])
{
const char *path = argv[1] ?: ".";
int fd = open(path, O_RDONLY);
if (fd < 0)
die("Error opening %s: %m\n", path);
struct fsuuid2 uuid;
if (ioctl(fd, FS_IOC_GETFSUUID, (unsigned long) &uuid))
die("FS_IOC_GETFSUUID error: %m\n");
if (uuid.len == 16) {
uuid_t u;
memcpy(&u, uuid.uuid, 16);
char str[37];
uuid_unparse(u, str);
puts(str);
} else {
for (unsigned i = 0; i < uuid.len; i++)
printf("%x", uuid.uuid[i]);
}
}
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