/**
* mnt_context_do_mount
* @cxt: context
*
* Call mount(2) or mount.type helper. Unnecessary for mnt_context_mount().
*
* Note that this function could be called only once. If you want to mount
* another source or target than you have to call mnt_reset_context().
*
* If you want to call mount(2) for the same source and target with a diffrent
* mount flags or fstype then you call mnt_context_reset_status() and then try
* again mnt_context_do_mount().
*
* WARNING: non-zero return code does not mean that mount(2) syscall or
* umount.type helper wasn't sucessfully called.
*
* Check mnt_context_get_status() after error!
*
* Returns: 0 on success;
* >0 in case of mount(2) error (returns syscall errno),
* <0 in case of other errors.
*/
int mnt_context_do_mount(struct libmnt_context *cxt)
{
const char *type;
int res;
assert(cxt);
assert(cxt->fs);
assert(cxt->helper_exec_status == 1);
assert(cxt->syscall_status == 1);
assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED));
assert((cxt->flags & MNT_FL_PREPARED));
assert((cxt->action == MNT_ACT_MOUNT));
DBG(CXT, mnt_debug_h(cxt, "mount: do mount"));
if (!(cxt->flags & MNT_FL_MOUNTDATA))
cxt->mountdata = (char *) mnt_fs_get_fs_options(cxt->fs);
type = mnt_fs_get_fstype(cxt->fs);
if (type)
res = do_mount(cxt, NULL);
else
res = do_mount_by_pattern(cxt, cxt->fstype_pattern);
if (mnt_context_get_status(cxt)
&& !(cxt->flags & MNT_FL_FAKE)
&& !cxt->helper) {
/*
* Mounted by mount(2), do some post-mount checks
*
* Kernel allows to use MS_RDONLY for bind mounts, but the
* read-only request could be silently ignored. Check it to
* avoid 'ro' in mtab and 'rw' in /proc/mounts.
*/
if ((cxt->mountflags & MS_BIND)
&& (cxt->mountflags & MS_RDONLY)
&& !mnt_is_readonly(mnt_context_get_target(cxt)))
mnt_context_set_mflags(cxt,
cxt->mountflags & ~MS_RDONLY);
/* Kernel can silently add MS_RDONLY flag when mounting file
* system that does not have write support. Check this to avoid
* 'ro' in /proc/mounts and 'rw' in mtab.
*/
if (!(cxt->mountflags & (MS_RDONLY | MS_PROPAGATION | MS_MOVE))
&& mnt_is_readonly(mnt_context_get_target(cxt)))
mnt_context_set_mflags(cxt,
cxt->mountflags | MS_RDONLY);
}
return res;
}
int mnt_context_is_loopdev(struct libmnt_context *cxt)
{
const char *type, *src;
assert(cxt);
/* The mount flags have to be merged, otherwise we have to use
* expensive mnt_context_get_user_mflags() instead of cxt->user_mountflags. */
assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED));
if (!cxt->fs)
return 0;
src = mnt_fs_get_srcpath(cxt->fs);
if (!src)
return 0; /* backing file not set */
if (cxt->user_mountflags & (MNT_MS_LOOP |
MNT_MS_OFFSET |
MNT_MS_SIZELIMIT)) {
DBG(LOOP, ul_debugobj(cxt, "loopdev specific options detected"));
return 1;
}
if ((cxt->mountflags & (MS_BIND | MS_MOVE))
|| mnt_context_propagation_only(cxt))
return 0;
/* Automatically create a loop device from a regular file if a
* filesystem is not specified or the filesystem is known for libblkid
* (these filesystems work with block devices only). The file size
* should be at least 1KiB, otherwise we will create an empty loopdev with
* no mountable filesystem...
*
* Note that there is no restriction (on kernel side) that would prevent a regular
* file as a mount(2) source argument. A filesystem that is able to mount
* regular files could be implemented.
*/
type = mnt_fs_get_fstype(cxt->fs);
if (mnt_fs_is_regular(cxt->fs) &&
(!type || strcmp(type, "auto") == 0 || blkid_known_fstype(type))) {
struct stat st;
if (stat(src, &st) == 0 && S_ISREG(st.st_mode) &&
st.st_size > 1024) {
DBG(LOOP, ul_debugobj(cxt, "automatically enabling loop= option"));
cxt->user_mountflags |= MNT_MS_LOOP;
mnt_optstr_append_option(&cxt->fs->user_optstr, "loop", NULL);
return 1;
}
}
return 0;
}
int mnt_context_is_loopdev(struct libmnt_context *cxt)
{
const char *type, *src;
int fl;
assert(cxt);
/* The mount flags have to be merged, otherwise we have to use
* expensive mnt_context_get_user_mflags() instead of cxt->user_mountflags. */
assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED));
if (!cxt->fs)
return 0;
src = mnt_fs_get_srcpath(cxt->fs);
if (!src)
return 0; /* backing file not set */
if (cxt->user_mountflags & (MNT_MS_LOOP |
MNT_MS_OFFSET |
MNT_MS_SIZELIMIT))
return 1;
if (cxt->mountflags & (MS_BIND | MS_MOVE | MS_PROPAGATION))
return 0;
/* Automatically create a loop device from a regular file if a filesystem
* is not specified or the filesystem is known for libblkid (these
* filesystems work with block devices only).
*
* Note that there is not a restriction (on kernel side) that prevents regular
* file as a mount(2) source argument. A filesystem that is able to mount
* regular files could be implemented.
*/
type = mnt_fs_get_fstype(cxt->fs);
fl = __mnt_fs_get_flags(cxt->fs);
if (!(fl && (MNT_FS_PSEUDO | MNT_FS_NET | MNT_FS_SWAP)) &&
(!type || strcmp(type, "auto") == 0 || blkid_known_fstype(type))) {
struct stat st;
if (stat(src, &st) || !S_ISREG(st.st_mode))
return 0;
}
return 1;
}
static int try_mount(struct libmnt_context *cxt, int bg)
{
struct libmnt_fs *fs;
const char *p;
char *src = NULL, *tgt = NULL, *type = NULL, *opts = NULL;
unsigned long flags = 0;
int fake, ret = 0;
fs = mnt_context_get_fs(cxt);
/* libmount returns read-only pointers (const char)
* so, reallocate for nfsmount() functions.
*/
if ((p = mnt_fs_get_source(fs))) /* spec */
src = strdup(p);
if ((p = mnt_fs_get_target(fs))) /* mountpoint */
tgt = strdup(p);
if ((p = mnt_fs_get_fstype(fs))) /* FS type */
type = strdup(p);
if ((p = mnt_fs_get_fs_options(fs))) /* mount options */
opts = strdup(p);
mnt_context_get_mflags(cxt, &flags); /* mount(2) flags */
fake = mnt_context_is_fake(cxt);
if (string)
ret = nfsmount_string(src, tgt, type, flags, &opts, fake, bg);
else if (strcmp(type, "nfs4") == 0)
ret = nfs4mount(src, tgt, flags, &opts, fake, bg);
else
ret = nfsmount(src, tgt, flags, &opts, fake, bg);
/* Store mount options if not called with mount --no-mtab */
if (!ret && !mnt_context_is_nomtab(cxt))
store_mount_options(fs, opts);
free(src);
free(tgt);
free(type);
free(opts);
return ret;
}
static void fs_interpret_type(struct libmnt_fs *fs)
{
const char *device;
const char *type = mnt_fs_get_fstype(fs);
if (type && strcmp(type, "auto") != 0)
return;
mnt_fs_set_fstype(fs, NULL);
device = fs_get_device(fs);
if (device) {
int ambi = 0;
type = mnt_get_fstype(device, &ambi, mnt_table_get_cache(fstab));
if (!ambi)
mnt_fs_set_fstype(fs, type);
}
}
/*
* Sets fs-root and fs-type to @upd->fs according to the @fs template and
* @mountfalgs. For MS_BIND mountflag it reads information about source
* filesystem from /proc/self/mountinfo.
*/
static int set_fs_root(struct libmnt_update *upd, struct libmnt_fs *fs,
unsigned long mountflags)
{
struct libmnt_fs *src_fs;
char *fsroot = NULL;
const char *src;
int rc = 0;
DBG(UPDATE, mnt_debug("setting FS root"));
assert(upd);
assert(upd->fs);
assert(fs);
if (mountflags & MS_BIND) {
if (!upd->mountinfo)
upd->mountinfo = mnt_new_table_from_file(_PATH_PROC_MOUNTINFO);
src = mnt_fs_get_srcpath(fs);
if (src) {
rc = mnt_fs_set_bindsrc(upd->fs, src);
if (rc)
goto err;
}
}
src_fs = mnt_table_get_fs_root(upd->mountinfo, fs,
mountflags, &fsroot);
if (src_fs) {
src = mnt_fs_get_srcpath(src_fs);
rc = mnt_fs_set_source(upd->fs, src);
if (rc)
goto err;
mnt_fs_set_fstype(upd->fs, mnt_fs_get_fstype(src_fs));
}
upd->fs->root = fsroot;
return 0;
err:
free(fsroot);
return rc;
}
static int get_debugfs(char **path)
{
struct libmnt_context *cxt;
struct libmnt_table *tb;
struct libmnt_iter *itr = NULL;
struct libmnt_fs *fs;
int found = 0, ret;
cxt = mnt_new_context();
if (!cxt)
err(EXIT_FAILURE, "libmount context allocation failed");
itr = mnt_new_iter(MNT_ITER_FORWARD);
if (!itr)
err(EXIT_FAILURE, "failed to initialize libmount iterator");
if (mnt_context_get_mtab(cxt, &tb))
err(EXIT_FAILURE, "failed to read mtab");
while (mnt_table_next_fs(tb, itr, &fs) == 0) {
const char *type = mnt_fs_get_fstype(fs);
if (!strcmp(type, "debugfs")) {
found = 1;
break;
}
}
if (found) {
ret = asprintf(path, "%s/gpio", mnt_fs_get_target(fs));
if (ret < 0)
err(EXIT_FAILURE, "failed to format string");
}
mnt_free_iter(itr);
mnt_free_context(cxt);
if (!found)
return -1;
return 0;
}
/* mtab and fstab update -- returns zero on success
*/
static int fprintf_mtab_fs(FILE *f, struct libmnt_fs *fs)
{
const char *o, *src, *fstype;
char *m1, *m2, *m3, *m4;
int rc;
assert(fs);
assert(f);
src = mnt_fs_get_source(fs);
fstype = mnt_fs_get_fstype(fs);
o = mnt_fs_get_options(fs);
m1 = src ? mangle(src) : "none";
m2 = mangle(mnt_fs_get_target(fs));
m3 = fstype ? mangle(fstype) : "none";
m4 = o ? mangle(o) : "rw";
if (m1 && m2 && m3 && m4) {
rc = fprintf(f, "%s %s %s %s %d %d\n",
m1, m2, m3, m4,
mnt_fs_get_freq(fs),
mnt_fs_get_passno(fs));
if (rc > 0)
rc = 0;
} else
rc = -ENOMEM;
if (src)
free(m1);
free(m2);
if (fstype)
free(m3);
if (o)
free(m4);
return rc;
}
/**
* mnt_context_next_umount:
* @cxt: context
* @itr: iterator
* @fs: returns the current filesystem
* @mntrc: returns the return code from mnt_context_umount()
* @ignored: returns 1 for not matching
*
* This function tries to umount the next filesystem from mtab (as returned by
* mnt_context_get_mtab()).
*
* You can filter out filesystems by:
* mnt_context_set_options_pattern() to simulate umount -a -O pattern
* mnt_context_set_fstype_pattern() to simulate umount -a -t pattern
*
* If the filesystem is not mounted or does not match defined criteria,
* then the function mnt_context_next_umount() returns zero, but the @ignored is
* non-zero. Note that the root filesystem is always ignored.
*
* If umount(2) syscall or umount.type helper failed, then the
* mnt_context_next_umount() function returns zero, but the @mntrc is non-zero.
* Use also mnt_context_get_status() to check if the filesystem was
* successfully umounted.
*
* Returns: 0 on success,
* <0 in case of error (!= umount(2) errors)
* 1 at the end of the list.
*/
int mnt_context_next_umount(struct libmnt_context *cxt,
struct libmnt_iter *itr,
struct libmnt_fs **fs,
int *mntrc,
int *ignored)
{
struct libmnt_table *mtab;
const char *tgt;
int rc;
if (ignored)
*ignored = 0;
if (mntrc)
*mntrc = 0;
if (!cxt || !fs || !itr)
return -EINVAL;
rc = mnt_context_get_mtab(cxt, &mtab);
cxt->mtab = NULL; /* do not reset mtab */
mnt_reset_context(cxt);
cxt->mtab = mtab;
if (rc)
return rc;
do {
rc = mnt_table_next_fs(mtab, itr, fs);
if (rc != 0)
return rc; /* no more filesystems (or error) */
tgt = mnt_fs_get_target(*fs);
} while (!tgt);
DBG(CXT, mnt_debug_h(cxt, "next-umount: trying %s", tgt));
/* ignore root filesystem */
if ((tgt && (strcmp(tgt, "/") == 0 || strcmp(tgt, "root") == 0)) ||
/* ignore filesystems not match with options patterns */
(cxt->fstype_pattern && !mnt_fs_match_fstype(*fs,
cxt->fstype_pattern)) ||
/* ignore filesystems not match with type patterns */
(cxt->optstr_pattern && !mnt_fs_match_options(*fs,
cxt->optstr_pattern))) {
if (ignored)
*ignored = 1;
DBG(CXT, mnt_debug_h(cxt, "next-umount: not-match "
"[fstype: %s, t-pattern: %s, options: %s, O-pattern: %s]",
mnt_fs_get_fstype(*fs),
cxt->fstype_pattern,
mnt_fs_get_options(*fs),
cxt->optstr_pattern));
return 0;
}
rc = mnt_context_set_fs(cxt, *fs);
if (rc)
return rc;
rc = mnt_context_umount(cxt);
if (mntrc)
*mntrc = rc;
return 0;
}
static int exec_helper(struct libmnt_context *cxt)
{
int rc;
assert(cxt);
assert(cxt->fs);
assert(cxt->helper);
assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED));
assert(cxt->helper_exec_status == 1);
DBG_FLUSH;
switch (fork()) {
case 0:
{
const char *args[10], *type;
int i = 0;
if (setgid(getgid()) < 0)
exit(EXIT_FAILURE);
if (setuid(getuid()) < 0)
exit(EXIT_FAILURE);
type = mnt_fs_get_fstype(cxt->fs);
args[i++] = cxt->helper; /* 1 */
args[i++] = mnt_fs_get_target(cxt->fs); /* 2 */
if (mnt_context_is_nomtab(cxt))
args[i++] = "-n"; /* 3 */
if (mnt_context_is_lazy(cxt))
args[i++] = "-l"; /* 4 */
if (mnt_context_is_force(cxt))
args[i++] = "-f"; /* 5 */
if (mnt_context_is_verbose(cxt))
args[i++] = "-v"; /* 6 */
if (mnt_context_is_rdonly_umount(cxt))
args[i++] = "-r"; /* 7 */
if (type && !endswith(cxt->helper, type)) {
args[i++] = "-t"; /* 8 */
args[i++] = (char *) type; /* 9 */
}
args[i] = NULL; /* 10 */
#ifdef CONFIG_LIBMOUNT_DEBUG
for (i = 0; args[i]; i++)
DBG(CXT, mnt_debug_h(cxt, "argv[%d] = \"%s\"",
i, args[i]));
#endif
DBG_FLUSH;
execv(cxt->helper, (char * const *) args);
exit(EXIT_FAILURE);
}
default:
{
int st;
wait(&st);
cxt->helper_status = WIFEXITED(st) ? WEXITSTATUS(st) : -1;
DBG(CXT, mnt_debug_h(cxt, "%s executed [status=%d]",
cxt->helper, cxt->helper_status));
cxt->helper_exec_status = rc = 0;
break;
}
case -1:
cxt->helper_exec_status = rc = -errno;
DBG(CXT, mnt_debug_h(cxt, "fork() failed"));
break;
}
return rc;
}
/* this is umount replacement to mnt_context_apply_fstab(), use
* mnt_context_tab_applied() to check result.
*/
static int lookup_umount_fs(struct libmnt_context *cxt)
{
const char *tgt;
struct stat st;
struct libmnt_fs *fs = NULL;
int rc = 0;
assert(cxt);
assert(cxt->fs);
tgt = mnt_fs_get_target(cxt->fs);
if (!tgt) {
DBG(CXT, ul_debugobj(cxt, "umount: undefined target"));
return -EINVAL;
}
/*
* Let's try to avoid mountinfo usage at all to minimize performance
* degradation. Don't forget that kernel has to compose *whole*
* mountinfo about all mountpoints although we look for only one entry.
*
* All we need is fstype and to check if there is no userspace mount
* options for the target (e.g. helper=udisks to call /sbin/umount.udisks).
*
* So, let's use statfs() if possible (it's bad idea for --lazy/--force
* umounts as target is probably unreachable NFS, also for --detach-loop
* as this additionally needs to know the name of the loop device).
*/
if (!mnt_context_is_restricted(cxt)
&& *tgt == '/'
&& !(cxt->flags & MNT_FL_HELPER)
&& !mnt_context_mtab_writable(cxt)
&& !mnt_context_is_force(cxt)
&& !mnt_context_is_lazy(cxt)
&& !mnt_context_is_loopdel(cxt)
&& mnt_stat_mountpoint(tgt, &st) == 0 && S_ISDIR(st.st_mode)
&& !has_utab_entry(cxt, tgt)) {
const char *type = mnt_fs_get_fstype(cxt->fs);
/* !mnt_context_mtab_writable(cxt) && has_utab_entry() verified that there
* is no stuff in utab, so disable all mtab/utab related actions */
mnt_context_disable_mtab(cxt, TRUE);
if (!type) {
struct statfs vfs;
if (statfs(tgt, &vfs) == 0)
type = mnt_statfs_get_fstype(&vfs);
if (type) {
rc = mnt_fs_set_fstype(cxt->fs, type);
if (rc)
return rc;
}
}
if (type) {
DBG(CXT, ul_debugobj(cxt,
"umount: mountinfo unnecessary [type=%s]", type));
return 0;
}
}
rc = mnt_context_find_umount_fs(cxt, tgt, &fs);
if (rc < 0)
return rc;
if (rc == 1 || !fs) {
DBG(CXT, ul_debugobj(cxt, "umount: cannot find '%s' in mtab", tgt));
return 0; /* this is correct! */
}
if (fs != cxt->fs) {
/* copy from mtab to our FS description
*/
mnt_fs_set_source(cxt->fs, NULL);
mnt_fs_set_target(cxt->fs, NULL);
if (!mnt_copy_fs(cxt->fs, fs)) {
DBG(CXT, ul_debugobj(cxt, "umount: failed to copy FS"));
return -errno;
}
DBG(CXT, ul_debugobj(cxt, "umount: mtab applied"));
}
cxt->flags |= MNT_FL_TAB_APPLIED;
return rc;
}
/**
* mnt_context_next_mount:
* @cxt: context
* @itr: iterator
* @fs: returns the current filesystem
* @mntrc: returns the return code from mnt_context_mount()
* @ignored: returns 1 for not matching and 2 for already mounted filesystems
*
* This function tries to mount the next filesystem from fstab (as returned by
* mnt_context_get_fstab()). See also mnt_context_set_fstab().
*
* You can filter out filesystems by:
* mnt_context_set_options_pattern() to simulate mount -a -O pattern
* mnt_context_set_fstype_pattern() to simulate mount -a -t pattern
*
* If the filesystem is already mounted or does not match defined criteria,
* then the mnt_context_next_mount() function returns zero, but the @ignored is
* non-zero. Note that the root filesystem and filesystems with "noauto" option
* are always ignored.
*
* If mount(2) syscall or mount.type helper failed, then the
* mnt_context_next_mount() function returns zero, but the @mntrc is non-zero.
* Use also mnt_context_get_status() to check if the filesystem was
* successfully mounted.
*
* Returns: 0 on success,
* <0 in case of error (!= mount(2) errors)
* 1 at the end of the list.
*/
int mnt_context_next_mount(struct libmnt_context *cxt,
struct libmnt_iter *itr,
struct libmnt_fs **fs,
int *mntrc,
int *ignored)
{
struct libmnt_table *fstab, *mtab;
const char *o, *tgt;
int rc, mounted = 0;
if (ignored)
*ignored = 0;
if (mntrc)
*mntrc = 0;
if (!cxt || !fs || !itr)
return -EINVAL;
mtab = cxt->mtab;
cxt->mtab = NULL; /* do not reset mtab */
mnt_reset_context(cxt);
cxt->mtab = mtab;
rc = mnt_context_get_fstab(cxt, &fstab);
if (rc)
return rc;
rc = mnt_table_next_fs(fstab, itr, fs);
if (rc != 0)
return rc; /* more filesystems (or error) */
o = mnt_fs_get_user_options(*fs);
tgt = mnt_fs_get_target(*fs);
DBG(CXT, mnt_debug_h(cxt, "next-mount: trying %s", tgt));
/* ignore swap */
if (mnt_fs_is_swaparea(*fs) ||
/* ignore root filesystem */
(tgt && (strcmp(tgt, "/") == 0 || strcmp(tgt, "root") == 0)) ||
/* ignore noauto filesystems */
(o && mnt_optstr_get_option(o, "noauto", NULL, NULL) == 0) ||
/* ignore filesystems not match with options patterns */
(cxt->fstype_pattern && !mnt_fs_match_fstype(*fs,
cxt->fstype_pattern)) ||
/* ignore filesystems not match with type patterns */
(cxt->optstr_pattern && !mnt_fs_match_options(*fs,
cxt->optstr_pattern))) {
if (ignored)
*ignored = 1;
DBG(CXT, mnt_debug_h(cxt, "next-mount: not-match "
"[fstype: %s, t-pattern: %s, options: %s, O-pattern: %s]",
mnt_fs_get_fstype(*fs),
cxt->fstype_pattern,
mnt_fs_get_options(*fs),
cxt->optstr_pattern));
return 0;
}
/* ignore already mounted filesystems */
rc = mnt_context_is_fs_mounted(cxt, *fs, &mounted);
if (rc)
return rc;
if (mounted) {
if (ignored)
*ignored = 2;
return 0;
}
if (mnt_context_is_fork(cxt)) {
rc = mnt_fork_context(cxt);
if (rc)
return rc; /* fork error */
if (mnt_context_is_parent(cxt)) {
return 0; /* parent */
}
}
/* child or non-forked */
rc = mnt_context_set_fs(cxt, *fs);
if (!rc) {
rc = mnt_context_mount(cxt);
if (mntrc)
*mntrc = rc;
}
if (mnt_context_is_child(cxt)) {
DBG(CXT, mnt_debug_h(cxt, "next-mount: child exit [rc=%d]", rc));
DBG_FLUSH;
exit(rc);
}
return 0;
}
/*
* The default is to use fstype from cxt->fs, this could be overwritten by
* @try_type argument.
*
* Returns: 0 on success,
* >0 in case of mount(2) error (returns syscall errno),
* <0 in case of other errors.
*/
static int do_mount(struct libmnt_context *cxt, const char *try_type)
{
int rc = 0;
const char *src, *target, *type;
unsigned long flags;
assert(cxt);
assert(cxt->fs);
assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED));
if (try_type && !cxt->helper) {
rc = mnt_context_prepare_helper(cxt, "mount", try_type);
if (rc)
return rc;
}
if (cxt->helper)
return exec_helper(cxt);
flags = cxt->mountflags;
src = mnt_fs_get_srcpath(cxt->fs);
target = mnt_fs_get_target(cxt->fs);
if (!target)
return -EINVAL;
if (!src) {
/* unnecessary, should be already resolved in
* mnt_context_prepare_srcpath(), but for sure... */
DBG(CXT, mnt_debug_h(cxt, "WARNING: source is NULL -- using \"none\"!"));
src = "none";
}
type = try_type ? : mnt_fs_get_fstype(cxt->fs);
if (!(flags & MS_MGC_MSK))
flags |= MS_MGC_VAL;
DBG(CXT, mnt_debug_h(cxt, "%smount(2) "
"[source=%s, target=%s, type=%s, "
" mountflags=0x%08lx, mountdata=%s]",
mnt_context_is_fake(cxt) ? "(FAKE) " : "",
src, target, type,
flags, cxt->mountdata ? "yes" : "<none>"));
if (mnt_context_is_fake(cxt))
cxt->syscall_status = 0;
else {
if (mount(src, target, type, flags, cxt->mountdata)) {
cxt->syscall_status = -errno;
DBG(CXT, mnt_debug_h(cxt, "mount(2) failed [errno=%d %m]",
-cxt->syscall_status));
return -cxt->syscall_status;
}
DBG(CXT, mnt_debug_h(cxt, "mount(2) success"));
cxt->syscall_status = 0;
}
if (try_type && cxt->update) {
struct libmnt_fs *fs = mnt_update_get_fs(cxt->update);
if (fs)
rc = mnt_fs_set_fstype(fs, try_type);
}
return rc;
}
static int exec_helper(struct libmnt_context *cxt)
{
char *o = NULL;
int rc;
assert(cxt);
assert(cxt->fs);
assert(cxt->helper);
assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED));
DBG(CXT, mnt_debug_h(cxt, "mount: executing helper %s", cxt->helper));
rc = generate_helper_optstr(cxt, &o);
if (rc)
return -EINVAL;
DBG_FLUSH;
switch (fork()) {
case 0:
{
const char *args[12], *type;
int i = 0;
if (setgid(getgid()) < 0)
exit(EXIT_FAILURE);
if (setuid(getuid()) < 0)
exit(EXIT_FAILURE);
type = mnt_fs_get_fstype(cxt->fs);
args[i++] = cxt->helper; /* 1 */
args[i++] = mnt_fs_get_srcpath(cxt->fs);/* 2 */
args[i++] = mnt_fs_get_target(cxt->fs); /* 3 */
/*
* TODO: remove the exception for "nfs", -s is documented
* for years should be usable everywhere.
*/
if (mnt_context_is_sloppy(cxt) &&
type && startswith(type, "nfs"))
args[i++] = "-s"; /* 4 */
if (mnt_context_is_fake(cxt))
args[i++] = "-f"; /* 5 */
if (mnt_context_is_nomtab(cxt))
args[i++] = "-n"; /* 6 */
if (mnt_context_is_verbose(cxt))
args[i++] = "-v"; /* 7 */
if (o) {
args[i++] = "-o"; /* 8 */
args[i++] = o; /* 9 */
}
if (type && !endswith(cxt->helper, type)) {
args[i++] = "-t"; /* 10 */
args[i++] = type; /* 11 */
}
args[i] = NULL; /* 12 */
#ifdef CONFIG_LIBMOUNT_DEBUG
for (i = 0; args[i]; i++)
DBG(CXT, mnt_debug_h(cxt, "argv[%d] = \"%s\"",
i, args[i]));
#endif
DBG_FLUSH;
execv(cxt->helper, (char * const *) args);
exit(EXIT_FAILURE);
}
default:
{
int st;
wait(&st);
cxt->helper_status = WIFEXITED(st) ? WEXITSTATUS(st) : -1;
DBG(CXT, mnt_debug_h(cxt, "%s executed [status=%d]",
cxt->helper, cxt->helper_status));
cxt->helper_exec_status = rc = 0;
break;
}
case -1:
cxt->helper_exec_status = rc = -errno;
DBG(CXT, mnt_debug_h(cxt, "fork() failed"));
break;
}
return rc;
}
