/**
* mnt_table_parse_fstab:
* @tb: table
* @filename: overwrites default (/etc/fstab or $LIBMOUNT_FSTAB) or NULL
*
* This function parses /etc/fstab or /etc/fstab.d and appends new lines to the
* @tab. If the system contains classic fstab file and also fstab.d directory
* then the fstab file is parsed before the fstab.d directory.
*
* The fstab.d directory:
* - files are sorted by strverscmp(3)
* - files that starts with "." are ignored (e.g. ".10foo.fstab")
* - files without the ".fstab" extension are ignored
*
* See also mnt_table_set_parser_errcb().
*
* Returns: 0 on success or negative number in case of error.
*/
int mnt_table_parse_fstab(struct libmnt_table *tb, const char *filename)
{
FILE *f;
assert(tb);
if (!tb)
return -EINVAL;
if (!filename)
filename = mnt_get_fstab_path();
tb->fmt = MNT_FMT_FSTAB;
f = fopen(filename, "r");
if (f) {
int rc = mnt_table_parse_stream(tb, f, filename);
fclose(f);
if (rc)
return rc;
if (strcmp(filename, _PATH_MNTTAB))
/* /etc/fstab.d sould be used together with /etc/fstab only */
return 0;
}
if (!access(_PATH_MNTTAB_DIR, R_OK))
return mnt_table_parse_dir(tb, _PATH_MNTTAB_DIR);
return 0;
}
static int mnt_table_parse_dir(struct libmnt_table *tb, const char *dirname)
{
int n = 0, i;
DIR *dir = NULL;
struct dirent **namelist = NULL;
/* TODO: it would be nice to have a scandir() implementation that
* is able to use already opened directory */
n = scandir(dirname, &namelist, NULL, versionsort);
if (n <= 0)
return 0;
/* let use "at" functions rather than play crazy games with paths... */
dir = opendir(dirname);
if (!dir)
return -errno;
for (i = 0; i < n; i++) {
struct dirent *d = namelist[i];
struct stat st;
size_t namesz;
FILE *f;
#ifdef _DIRENT_HAVE_D_TYPE
if (d->d_type != DT_UNKNOWN && d->d_type != DT_REG &&
d->d_type != DT_LNK)
continue;
#endif
if (*d->d_name == '.')
continue;
#define MNT_MNTTABDIR_EXTSIZ (sizeof(MNT_MNTTABDIR_EXT) - 1)
namesz = strlen(d->d_name);
if (!namesz || namesz < MNT_MNTTABDIR_EXTSIZ + 1 ||
strcmp(d->d_name + (namesz - MNT_MNTTABDIR_EXTSIZ),
MNT_MNTTABDIR_EXT))
continue;
if (fstat_at(dirfd(dir), _PATH_MNTTAB_DIR, d->d_name, &st, 0) ||
!S_ISREG(st.st_mode))
continue;
f = fopen_at(dirfd(dir), _PATH_MNTTAB_DIR,
d->d_name, O_RDONLY, "r");
if (f) {
mnt_table_parse_stream(tb, f, d->d_name);
fclose(f);
}
}
for (i = 0; i < n; i++)
free(namelist[i]);
free(namelist);
if (dir)
closedir(dir);
return 0;
}
static int __mnt_table_parse_dir(struct libmnt_table *tb, const char *dirname)
{
int n = 0, i, r = 0;
DIR *dir = NULL;
struct dirent **namelist = NULL;
n = scandir(dirname, &namelist, mnt_table_parse_dir_filter, versionsort);
if (n <= 0)
return 0;
/* let use "at" functions rather than play crazy games with paths... */
dir = opendir(dirname);
if (!dir) {
r = -errno;
goto out;
}
for (i = 0; i < n; i++) {
struct dirent *d = namelist[i];
struct stat st;
FILE *f;
if (fstat_at(dirfd(dir), _PATH_MNTTAB_DIR, d->d_name, &st, 0) ||
!S_ISREG(st.st_mode))
continue;
f = fopen_at(dirfd(dir), _PATH_MNTTAB_DIR,
d->d_name, O_RDONLY, "r");
if (f) {
mnt_table_parse_stream(tb, f, d->d_name);
fclose(f);
}
}
out:
for (i = 0; i < n; i++)
free(namelist[i]);
free(namelist);
if (dir)
closedir(dir);
return r;
}
/**
* mnt_table_parse_file:
* @tb: tab pointer
* @filename: file
*
* Parses whole table (e.g. /etc/mtab) and appends new records to the @tab.
*
* The libmount parser ignores broken (syntax error) lines, these lines are
* reported to caller by errcb() function (see mnt_table_set_parser_errcb()).
*
* Returns: 0 on success, negative number in case of error.
*/
int mnt_table_parse_file(struct libmnt_table *tb, const char *filename)
{
FILE *f;
int rc;
assert(tb);
assert(filename);
if (!filename || !tb)
return -EINVAL;
f = fopen(filename, "r");
if (f) {
rc = mnt_table_parse_stream(tb, f, filename);
fclose(f);
} else
return -errno;
return rc;
}
static int __mnt_table_parse_dir(struct libmnt_table *tb, const char *dirname)
{
int n = 0, i;
int dd;
struct dirent **namelist = NULL;
dd = open(dirname, O_RDONLY|O_CLOEXEC|O_DIRECTORY);
if (dd < 0)
return -errno;
n = scandirat(dd, ".", &namelist, mnt_table_parse_dir_filter, versionsort);
if (n <= 0) {
close(dd);
return 0;
}
for (i = 0; i < n; i++) {
struct dirent *d = namelist[i];
struct stat st;
FILE *f;
if (fstat_at(dd, ".", d->d_name, &st, 0) ||
!S_ISREG(st.st_mode))
continue;
f = fopen_at(dd, ".", d->d_name, O_RDONLY, "r");
if (f) {
mnt_table_parse_stream(tb, f, d->d_name);
fclose(f);
}
}
for (i = 0; i < n; i++)
free(namelist[i]);
free(namelist);
close(dd);
return 0;
}
/**
* mnt_table_parse_stream:
* @tb: tab pointer
* @f: file stream
* @filename: filename used for debug and error messages
*
* Returns: 0 on success, negative number in case of error.
*/
int mnt_table_parse_stream(struct libmnt_table *tb, FILE *f, const char *filename)
{
int rc = -1;
int flags = 0;
pid_t tid = -1;
struct libmnt_fs *fs = NULL;
struct libmnt_parser pa = { .line = 0 };
assert(tb);
assert(f);
assert(filename);
DBG(TAB, ul_debugobj(tb, "%s: start parsing [entries=%d, filter=%s]",
filename, mnt_table_get_nents(tb),
tb->fltrcb ? "yes" : "not"));
pa.filename = filename;
pa.f = f;
/* necessary for /proc/mounts only, the /proc/self/mountinfo
* parser sets the flag properly
*/
if (filename && strcmp(filename, _PATH_PROC_MOUNTS) == 0)
flags = MNT_FS_KERNEL;
while (!feof(f)) {
if (!fs) {
fs = mnt_new_fs();
if (!fs)
goto err;
}
rc = mnt_table_parse_next(&pa, tb, fs);
if (!rc && tb->fltrcb && tb->fltrcb(fs, tb->fltrcb_data))
rc = 1; /* filtered out by callback... */
if (!rc) {
rc = mnt_table_add_fs(tb, fs);
fs->flags |= flags;
if (rc == 0 && tb->fmt == MNT_FMT_MOUNTINFO) {
rc = kernel_fs_postparse(tb, fs, &tid, filename);
if (rc)
mnt_table_remove_fs(tb, fs);
}
}
if (rc) {
if (rc > 0) {
mnt_reset_fs(fs);
assert(fs->refcount == 1);
continue; /* recoverable error, reuse fs*/
}
mnt_unref_fs(fs);
if (feof(f))
break;
goto err; /* fatal error */
}
mnt_unref_fs(fs);
fs = NULL;
}
DBG(TAB, ul_debugobj(tb, "%s: stop parsing (%d entries)",
filename, mnt_table_get_nents(tb)));
parser_cleanup(&pa);
return 0;
err:
DBG(TAB, ul_debugobj(tb, "%s: parse error (rc=%d)", filename, rc));
parser_cleanup(&pa);
return rc;
}
/**
* mnt_table_parse_file:
* @tb: tab pointer
* @filename: file
*
* Parses the whole table (e.g. /etc/fstab) and appends new records to the @tab.
*
* The libmount parser ignores broken (syntax error) lines, these lines are
* reported to the caller by the errcb() function (see mnt_table_set_parser_errcb()).
*
* Returns: 0 on success, negative number in case of error.
*/
int mnt_table_parse_file(struct libmnt_table *tb, const char *filename)
{
FILE *f;
int rc;
if (!filename || !tb)
return -EINVAL;
f = fopen(filename, "r" UL_CLOEXECSTR);
if (f) {
rc = mnt_table_parse_stream(tb, f, filename);
fclose(f);
} else
rc = -errno;
DBG(TAB, ul_debugobj(tb, "parsing done [filename=%s, rc=%d]", filename, rc));
return rc;
}
