ubase/mount.c

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/* See LICENSE file for copyright and license details. */
#include <sys/mount.h>
#include <sys/types.h>
#include <sys/stat.h>
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#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "grabmntinfo.h"
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#include "util.h"
struct {
const char *opt;
const char *notopt;
unsigned long v;
} optnames[] = {
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{ "remount", NULL, MS_REMOUNT },
{ "ro", "rw", MS_RDONLY },
{ "sync", "async", MS_SYNCHRONOUS },
{ "dirsync", NULL, MS_DIRSYNC },
{ "nodev", "dev", MS_NODEV },
{ "noatime", "atime", MS_NOATIME },
{ "nodiratime", "diratime", MS_NODIRATIME },
{ "noexec", "exec", MS_NOEXEC },
{ "nosuid", "suid", MS_NOSUID },
{ "mand", "nomand", MS_MANDLOCK },
{ "relatime", "norelatime", MS_RELATIME },
{ NULL, NULL, 0 }
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};
static struct option {
char *name;
struct option *next;
} *opthead;
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static void
usage(void)
{
eprintf("usage: %s [-BMRdn] [-t fstype] [-o options] source target\n",
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argv0);
}
int
main(int argc, char *argv[])
{
int i, validopt, siz = 0, oflag = 0;
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unsigned long flags = 0;
char *types = NULL, *arg = NULL, *p;
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const char *source;
const char *target;
struct stat st1, st2;
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void *data = NULL;
struct mntinfo *minfo = NULL;
struct option *opt, *tmp;
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ARGBEGIN {
case 'B':
flags |= MS_BIND;
break;
case 'M':
flags |= MS_MOVE;
break;
case 'R':
flags |= MS_REC;
break;
case 'd':
data = EARGF(usage());
break;
case 'o':
oflag = 1;
arg = EARGF(usage());
for (p = strtok(arg, ","); p; p = strtok(NULL, ",")) {
opt = malloc(sizeof(*opt));
if (!opt)
eprintf("malloc:");
opt->name = strdup(p);
if (!opt->name)
eprintf("strdup:");
opt->next = opthead;
opthead = opt;
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}
break;
case 't':
types = EARGF(usage());
break;
case 'n':
break;
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default:
usage();
} ARGEND;
if (argc < 1)
usage();
for (opt = opthead; opt; opt = opt->next) {
validopt = 0;
for (i = 0; optnames[i].v; i++) {
if (optnames[i].opt) {
if (!strcmp(opt->name,
optnames[i].opt)) {
flags |= optnames[i].v;
validopt = 1;
break;
}
}
if (optnames[i].notopt) {
if (!strcmp(opt->name,
optnames[i].notopt)) {
flags &= ~optnames[i].v;
validopt = 1;
break;
}
}
}
if (!validopt)
break;
}
if (oflag && !validopt)
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enprintf(EXIT_FAILURE, "unknown option: %s\n", opt->name);
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source = argv[0];
target = argv[1];
if (!target) {
target = argv[0];
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source = NULL;
if (stat(target, &st1) < 0)
eprintf("stat %s:", target);
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siz = grabmntinfo(&minfo);
if (!siz)
eprintf("grabmntinfo:");
for (i = 0; i < siz; i++) {
if (stat(minfo[i].mntdir, &st2) < 0)
eprintf("stat %s:", minfo[i].mntdir);
if (st1.st_dev == st2.st_dev &&
st1.st_ino == st2.st_ino) {
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source = minfo[i].fsname;
break;
}
}
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if (!source)
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enprintf(EXIT_FAILURE, "can't find %s mountpoint\n",
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target);
}
if (mount(source, target, types, flags, data) < 0)
eprintf("mount:");
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for (i = 0; i < siz; i++) {
free(minfo[i].fsname);
free(minfo[i].mntdir);
}
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free(minfo);
opt = opthead;
while (opt) {
tmp = opt->next;
free(opt->name);
free(opt);
opt = tmp;
}
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return EXIT_SUCCESS;
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}