80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
/*
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* Copyright (C) 2023 Karel Zak <kzak@redhat.com>
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*
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* This file may be redistributed under the terms of the
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* GNU Lesser General Public License.
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*/
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#include <stdlib.h>
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#include "c.h"
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#include "strutils.h"
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#include "libmount.h"
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#include "mount-api-utils.h" /* fallback for old linux/mount.h */
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int main(int argc, char *argv[])
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{
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struct libmnt_fs *fs;
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struct libmnt_statmnt *sm;
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const char *mnt;
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uint64_t id = 0;
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if (argc != 2)
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errx(EXIT_FAILURE, "usage: %s <mountpoint | id>",
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program_invocation_short_name);
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mnt_init_debug(0);
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fs = mnt_new_fs();
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if (!fs)
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err(EXIT_FAILURE, "failed to allocate fs handler");
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/* define target (mountpoint) or mount ID */
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mnt = argv[1];
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if (isdigit_string(mnt)) {
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id = strtou64_or_err(mnt, "cannot ID");
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mnt_fs_set_uniq_id(fs, id);
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} else
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mnt_fs_set_target(fs, mnt);
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/*
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* A) fetch all data without reference to libmnt_statmnt
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*/
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if (mnt_fs_fetch_statmount(fs, 0) != 0)
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warn("failed to read data by statmount()");
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mnt_fs_print_debug(fs, stdout);
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/* reset */
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id = mnt_fs_get_uniq_id(fs);
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mnt_reset_fs(fs);
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mnt_fs_set_uniq_id(fs, id);
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/*
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* B) fetch data by on-demand way
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*/
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sm = mnt_new_statmnt();
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if (!sm)
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err(EXIT_FAILURE, "failed to allocate statmount handler");
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mnt_fs_refer_statmnt(fs, sm);
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/* read fs type, but nothing else */
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mnt_fs_get_fstype(fs);
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mnt_fs_print_debug(fs, stdout);
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/* read fs root, but nothing else */
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mnt_fs_get_root(fs);
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mnt_fs_print_debug(fs, stdout);
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/* read all mising data */
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mnt_fs_fetch_statmount(fs, 0);
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mnt_fs_print_debug(fs, stdout);
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/* see debug, this is no-op for statmount() */
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mnt_fs_get_fstype(fs);
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mnt_unref_fs(fs);
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mnt_unref_statmnt(sm);
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return EXIT_SUCCESS;
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}
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