src/shared/libmount-util.h

/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once

#include <stdio.h>

/* This needs to be after sys/mount.h */
#include <libmount.h>

#include "macro.h"

DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_table*, mnt_free_table);
DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_iter*, mnt_free_iter);

static inline int libmount_parse(
                const char *path,
                FILE *source,
                struct libmnt_table **ret_table,
                struct libmnt_iter **ret_iter) {

        _cleanup_(mnt_free_tablep) struct libmnt_table *table = NULL;
        _cleanup_(mnt_free_iterp) struct libmnt_iter *iter = NULL;
        int r;

        /* Older libmount seems to require this. */
        assert(!source || path);

        table = mnt_new_table();
        iter = mnt_new_iter(MNT_ITER_FORWARD);
        if (!table || !iter)
                return -ENOMEM;

        /* If source or path are specified, we use on the functions which ignore utab.
         * Only if both are empty, we use mnt_table_parse_mtab(). */

        if (source)
                r = mnt_table_parse_stream(table, source, path);
        else if (path)
                r = mnt_table_parse_file(table, path);
        else
                r = mnt_table_parse_mtab(table, NULL);
        if (r < 0)
                return r;

        *ret_table = TAKE_PTR(table);
        *ret_iter = TAKE_PTR(iter);
        return 0;
}