void update_mtab(const char *dir, struct mntent *instead)
{
struct mntent *mnt;
struct mntent *next;
struct mntent remnt;
int added = 0;
mntFILE *mfp, *mftmp;
if (mtab_does_not_exist() || mtab_is_a_symlink())
return;
lock_mtab();
mfp = my_setmntent(MOUNTED, "r");
if (mfp == NULL || mfp->mntent_fp == NULL) {
error("cannot open %s (%s) - mtab not updated", MOUNTED, strerror(errno));
goto leave;
}
mftmp = my_setmntent(MOUNTED_TEMP, "w");
if (mftmp == NULL || mftmp->mntent_fp == NULL) {
error("can't open %s (%s) - mtab not updated", MOUNTED_TEMP, strerror(errno));
goto leave;
}
while ((mnt = my_getmntent(mfp))) {
if (streq(mnt->mnt_dir, dir)) {
added++;
if (instead) { /* a remount */
remnt = *instead;
next = &remnt;
remnt.mnt_fsname = mnt->mnt_fsname;
remnt.mnt_type = mnt->mnt_type;
if (instead->mnt_fsname && !streq(mnt->mnt_fsname, instead->mnt_fsname))
printf("mount: warning: cannot change " "mounted device with a remount\n");
else if (instead->mnt_type && !streq(instead->mnt_type, "unknown")
&& !streq(mnt->mnt_type, instead->mnt_type))
printf("mount: warning: cannot change " "filesystem type with a remount\n");
} else
next = NULL;
} else
next = mnt;
if (next && my_addmntent(mftmp, next) == 1)
die(EX_FILEIO, "error writing %s: %s", MOUNTED_TEMP, strerror(errno));
}
if (instead && !added && my_addmntent(mftmp, instead) == 1)
die(EX_FILEIO, "error writing %s: %s", MOUNTED_TEMP, strerror(errno));
my_endmntent(mfp);
if (fchmod(fileno(mftmp->mntent_fp), S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH) < 0)
fprintf(stderr, "error changing mode of %s: %s\n", MOUNTED_TEMP, strerror(errno));
my_endmntent(mftmp);
if (rename(MOUNTED_TEMP, MOUNTED) < 0)
fprintf(stderr, "can't rename %s to %s: %s\n", MOUNTED_TEMP, MOUNTED, strerror(errno));
leave:
unlock_mtab();
}
static void read_mntentchn(mntFILE * mfp, const char *fnam, struct mntentchn *mc0)
{
struct mntentchn *mc = mc0;
struct mntent *mnt;
while ((mnt = my_getmntent(mfp)) != NULL && !streq(mnt->mnt_type, MNTTYPE_IGNORE)) {
mc->nxt = (struct mntentchn *)xmalloc(sizeof(*mc));
mc->nxt->prev = mc;
mc = mc->nxt;
mc->mnt_fsname = mnt->mnt_fsname;
mc->mnt_dir = mnt->mnt_dir;
mc->mnt_type = mnt->mnt_type;
mc->mnt_opts = mnt->mnt_opts;
mc->nxt = NULL;
}
mc0->prev = mc;
if (ferror(mfp->mntent_fp)) {
error("warning: error reading %s: %s", fnam, strerror(errno));
mc0->nxt = mc0->prev = NULL;
}
my_endmntent(mfp);
}
static void
read_mntentchn(mntFILE *mfp, const char *fnam, struct mntentchn *mc0) {
struct mntentchn *mc = mc0;
struct my_mntent *mnt;
while ((mnt = my_getmntent(mfp)) != NULL) {
if (!streq(mnt->mnt_type, MNTTYPE_IGNORE)) {
mc->nxt = (struct mntentchn *) xmalloc(sizeof(*mc));
mc->nxt->prev = mc;
mc = mc->nxt;
mc->m = *mnt;
mc->nxt = mc0;
}
}
mc0->prev = mc;
if (ferror(mfp->mntent_fp)) {
int errsv = errno;
error(_("warning: error reading %s: %s"),
fnam, strerror (errsv));
mc0->nxt = mc0->prev = NULL;
}
my_endmntent(mfp);
}
