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/*
* by rmk
*/
#include <sys/mount.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <mntent.h>
#include "mount_opts.h"
#define _PATH_MOUNTED "/etc/mtab"
#define _PATH_PROC_MOUNTS "/proc/mounts"
char *progname;
static struct extra_opts extra;
static unsigned long rwflag;
static __noreturn usage(void)
{
fprintf(stderr, "Usage: %s [-r] [-w] [-o options] [-t type] [-f] [-i] "
"[-n] device directory\n", progname);
exit(1);
}
static __noreturn print_mount(char *type)
{
FILE *mfp;
struct mntent *mnt;
mfp = setmntent(_PATH_PROC_MOUNTS, "r");
if (!mfp)
mfp = setmntent(_PATH_MOUNTED, "r");
if (!mfp)
perror("setmntent");
while ((mnt = getmntent(mfp)) != NULL) {
if (mnt->mnt_fsname && !strncmp(mnt->mnt_fsname, "no", 2))
continue;
if (type && mnt->mnt_type && strcmp(type, mnt->mnt_type))
continue;
printf("%s on %s", mnt->mnt_fsname, mnt->mnt_dir);
if (mnt->mnt_type != NULL && *mnt->mnt_type != '\0')
printf(" type %s", mnt->mnt_type);
if (mnt->mnt_opts != NULL && *mnt->mnt_opts != '\0')
printf(" (%s)", mnt->mnt_opts);
printf("\n");
}
endmntent(mfp);
exit(0);
}
static int
do_mount(char *dev, char *dir, char *type, unsigned long rwflag, void *data)
{
char *s;
int error = 0;
while ((s = strsep(&type, ",")) != NULL) {
retry:
if (mount(dev, dir, s, rwflag, data) == -1) {
error = errno;
/*
* If the filesystem is not found, or the
* superblock is invalid, try the next.
*/
if (error == ENODEV || error == EINVAL)
continue;
/*
* If we get EACCESS, and we're trying to
* mount readwrite and this isn't a remount,
* try read only.
*/
if (error == EACCES &&
(rwflag & (MS_REMOUNT | MS_RDONLY)) == 0) {
rwflag |= MS_RDONLY;
goto retry;
}
} else {
error = 0;
}
break;
}
if (error) {
errno = error;
perror("mount");
return 255;
}
return 0;
}
int main(int argc, char *argv[])
{
char *type = NULL;
int c;
progname = argv[0];
rwflag = MS_VERBOSE;
do {
c = getopt(argc, argv, "fhino:rt:w");
if (c == EOF)
break;
switch (c) {
case 'f':
/* we can't edit /etc/mtab yet anyway; exit */
exit(0);
case 'i':
/* ignore for now; no support for mount helpers */
break;
case 'h':
usage();
case 'n':
/* no mtab writing */
break;
case 'o':
rwflag = parse_mount_options(optarg, rwflag, &extra);
break;
case 'r':
rwflag |= MS_RDONLY;
break;
case 't':
type = optarg;
break;
case 'w':
rwflag &= ~MS_RDONLY;
break;
case '?':
fprintf(stderr, "%s: invalid option -%c\n",
progname, optopt);
exit(1);
}
} while (1);
if (optind == argc)
print_mount(type);
/*
* If remount, bind or move was specified, then we don't
* have a "type" as such. Use the dummy "none" type.
*/
if (rwflag & MS_TYPE)
type = "none";
if (optind + 2 != argc || type == NULL)
usage();
return do_mount(argv[optind], argv[optind + 1], type, rwflag,
extra.str);
}
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