/* todo: there are some cases which options are not changed */
static void update_mtab(FILE *fp, char *mntpnt, int do_remount, int do_verbose)
{
int err;
long pos;
FILE *ofp;
struct mntent ent, *p;
/* prohibit updating mount options for this mntpnt */
au_plink_maint(mntpnt);
err = au_proc_getmntent(mntpnt, &ent);
if (err)
AuFin("no such mount point");
ofp = setmntent(MTab, "r");
if (!ofp)
AuFin(MTab);
if (do_remount) {
/* find the last one */
pos = -1;
while ((p = getmntent(ofp))) {
if (!strcmp(p->mnt_dir, mntpnt))
pos = ftell(ofp);
}
rewind(ofp);
if (pos > 0) {
while ((p = getmntent(ofp))) {
if (ftell(ofp) == pos) {
/* replace the line */
p = &ent;
pos = -1;
}
err = addmntent(fp, p);
if (err)
AuFin("addmntent");
}
if (pos > 0)
AuFin("internal error");
} else
append_mtab(fp, ofp, &ent);
} else
append_mtab(fp, ofp, &ent);
endmntent(ofp); /* ignore */
au_plink_maint(NULL);
if (do_verbose)
au_print_ent(&ent);
}
int main(int argc, char *argv[])
{
int err, c, status;
pid_t pid;
unsigned char flags[LastOpt];
struct mntent ent;
char *dev, *mntpnt, *opts, *cwd;
DIR *cur;
if (argc < 3) {
errno = EINVAL;
AuFin(NULL);
}
memset(flags, 0, sizeof(flags));
flags[Update] = 1;
opts = NULL;
/* mount(8) always passes the arguments in this order */
dev = argv[1];
mntpnt = argv[2];
while ((c = getopt(argc - 2, argv + 2, "nvo:")) != -1) {
switch (c) {
case 'n':
flags[Update] = 0;
break;
case 'v':
flags[Verbose] = 1;
break;
case 'o':
opts = optarg;
break;
case '?':
case ':':
errno = EINVAL;
AuFin("internal error");
}
}
cur = opendir(".");
if (!cur)
AuFin(".");
err = chdir(mntpnt);
if (err)
AuFin(mntpnt);
cwd = getcwd(NULL, 0); /* glibc */
if (!cwd)
AuFin("getcwd");
err = fchdir(dirfd(cur));
if (err)
AuFin("fchdir");
closedir(cur); /* ignore */
if (opts)
test_opts(opts, flags);
if (!flags[Bind] && flags[Update]) {
err = access(MTab, R_OK | W_OK);
if (err)
AuFin(MTab);
}
if (flags[Remount]) {
errno = EINVAL;
if (flags[Bind])
AuFin("both of remount and bind are specified");
flags[AuFlush] = test_flush(opts);
if (flags[AuFlush]) {
err = au_plink(cwd, AuPlink_FLUSH, 1, 1);
if (err)
AuFin(NULL);
}
}
pid = fork();
if (!pid) {
/* actual mount operation */
do_mount(dev, mntpnt, argc, argv, flags);
return 0;
} else if (pid < 0)
AuFin("fork");
err = waitpid(pid, &status, 0);
if (err < 0)
AuFin("child process");
err = !WIFEXITED(status);
if (!err)
err = WEXITSTATUS(status);
if (!err && !flags[Bind]) {
if (flags[Update])
err = au_update_mtab(cwd, flags[Remount],
flags[Verbose]);
else if (flags[Verbose]) {
/* withoug blocking plink */
err = au_proc_getmntent(cwd, &ent);
if (!err)
au_print_ent(&ent);
else
AuFin("internal error");
}
}
return err;
}
