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findmnt.c
1345 lines (1163 loc) · 31 KB
/
findmnt.c
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/*
* findmnt(8)
*
* Copyright (C) 2010,2011 Red Hat, Inc. All rights reserved.
* Written by Karel Zak <kzak@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <getopt.h>
#include <string.h>
#include <termios.h>
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#include <assert.h>
#include <poll.h>
#include <sys/statvfs.h>
#include <sys/types.h>
#include <libmount.h>
#include "pathnames.h"
#include "nls.h"
#include "closestream.h"
#include "c.h"
#include "tt.h"
#include "strutils.h"
#include "xalloc.h"
/* flags */
enum {
FL_EVALUATE = (1 << 1),
FL_CANONICALIZE = (1 << 2),
FL_FIRSTONLY = (1 << 3),
FL_INVERT = (1 << 4),
FL_NOSWAPMATCH = (1 << 6),
FL_NOFSROOT = (1 << 7),
FL_SUBMOUNTS = (1 << 8),
FL_POLL = (1 << 9),
FL_DF = (1 << 10),
FL_ALL = (1 << 11)
};
/* column IDs */
enum {
COL_SOURCE,
COL_TARGET,
COL_FSTYPE,
COL_OPTIONS,
COL_VFS_OPTIONS,
COL_FS_OPTIONS,
COL_LABEL,
COL_UUID,
COL_PARTLABEL,
COL_PARTUUID,
COL_MAJMIN,
COL_ACTION,
COL_OLD_TARGET,
COL_OLD_OPTIONS,
COL_SIZE,
COL_AVAIL,
COL_USED,
COL_USEPERC,
FINDMNT_NCOLUMNS
};
enum {
TABTYPE_FSTAB = 1,
TABTYPE_MTAB,
TABTYPE_KERNEL
};
/* column names */
struct colinfo {
const char *name; /* header */
double whint; /* width hint (N < 1 is in percent of termwidth) */
int flags; /* tt flags */
const char *help; /* column description */
const char *match; /* pattern for match_func() */
void *match_data; /* match specific data */
};
/* columns descriptions (don't use const, this is writable) */
static struct colinfo infos[FINDMNT_NCOLUMNS] = {
[COL_SOURCE] = { "SOURCE", 0.25, TT_FL_NOEXTREMES, N_("source device") },
[COL_TARGET] = { "TARGET", 0.30, TT_FL_TREE | TT_FL_NOEXTREMES, N_("mountpoint") },
[COL_FSTYPE] = { "FSTYPE", 0.10, TT_FL_TRUNC, N_("filesystem type") },
[COL_OPTIONS] = { "OPTIONS", 0.10, TT_FL_TRUNC, N_("all mount options") },
[COL_VFS_OPTIONS] = { "VFS-OPTIONS", 0.20, TT_FL_TRUNC, N_("VFS specific mount options") },
[COL_FS_OPTIONS] = { "FS-OPTIONS", 0.10, TT_FL_TRUNC, N_("FS specific mount options") },
[COL_LABEL] = { "LABEL", 0.10, 0, N_("filesystem label") },
[COL_UUID] = { "UUID", 36, 0, N_("filesystem UUID") },
[COL_PARTLABEL] = { "PARTLABEL", 0.10, 0, N_("partition label") },
[COL_PARTUUID] = { "PARTUUID", 36, 0, N_("partition UUID") },
[COL_MAJMIN] = { "MAJ:MIN", 6, 0, N_("major:minor device number") },
[COL_ACTION] = { "ACTION", 10, TT_FL_STRICTWIDTH, N_("action detected by --poll") },
[COL_OLD_OPTIONS] = { "OLD-OPTIONS", 0.10, TT_FL_TRUNC, N_("old mount options saved by --poll") },
[COL_OLD_TARGET] = { "OLD-TARGET", 0.30, 0, N_("old mountpoint saved by --poll") },
[COL_SIZE] = { "SIZE", 5, TT_FL_RIGHT, N_("filesystem size") },
[COL_AVAIL] = { "AVAIL", 5, TT_FL_RIGHT, N_("filesystem size available") },
[COL_USED] = { "USED", 5, TT_FL_RIGHT, N_("filesystem size used") },
[COL_USEPERC] = { "USE%", 3, TT_FL_RIGHT, N_("filesystem use percentage") },
};
/* global flags */
static int flags;
static int tt_flags;
/* array with IDs of enabled columns */
static int columns[FINDMNT_NCOLUMNS];
static int ncolumns;
/* poll actions (parsed --poll=<list> */
#define FINDMNT_NACTIONS 4 /* mount, umount, move, remount */
static int actions[FINDMNT_NACTIONS];
static int nactions;
/* libmount cache */
static struct libmnt_cache *cache;
static int get_column_id(int num)
{
assert(num < ncolumns);
assert(columns[num] < FINDMNT_NCOLUMNS);
return columns[num];
}
static struct colinfo *get_column_info(int num)
{
return &infos[ get_column_id(num) ];
}
static const char *column_id_to_name(int id)
{
assert(id < FINDMNT_NCOLUMNS);
return infos[id].name;
}
static const char *get_column_name(int num)
{
return get_column_info(num)->name;
}
static float get_column_whint(int num)
{
return get_column_info(num)->whint;
}
static int get_column_flags(int num)
{
return get_column_info(num)->flags;
}
static const char *get_match(int id)
{
assert(id < FINDMNT_NCOLUMNS);
return infos[id].match;
}
static void *get_match_data(int id)
{
assert(id < FINDMNT_NCOLUMNS);
return infos[id].match_data;
}
static void set_match(int id, const char *match)
{
assert(id < FINDMNT_NCOLUMNS);
infos[id].match = match;
}
static void set_match_data(int id, void *data)
{
assert(id < FINDMNT_NCOLUMNS);
infos[id].match_data = data;
}
/*
* source match means COL_SOURCE *or* COL_MAJMIN, depends on
* data format.
*/
static void set_source_match(const char *data)
{
int maj, min;
if (sscanf(data, "%d:%d", &maj, &min) == 2) {
dev_t *devno = xmalloc(sizeof(dev_t));
*devno = makedev(maj, min);
set_match(COL_MAJMIN, data);
set_match_data(COL_MAJMIN, (void *) devno);
flags |= FL_NOSWAPMATCH;
} else
set_match(COL_SOURCE, data);
}
static void enable_extra_target_match(void)
{
char *cn = NULL, *mnt = NULL;
/*
* Check if match pattern is mountpoint, if not use the
* real mountpoint.
*/
cn = mnt_resolve_path(get_match(COL_TARGET), cache);
if (!cn)
return;
mnt = mnt_get_mountpoint(cn);
if (!mnt || strcmp(mnt, cn) == 0)
return;
/* replace the current setting with the real mountpoint */
set_match(COL_TARGET, mnt);
}
static int is_tabdiff_column(int id)
{
assert(id < FINDMNT_NCOLUMNS);
switch(id) {
case COL_ACTION:
case COL_OLD_TARGET:
case COL_OLD_OPTIONS:
return 1;
default:
break;
}
return 0;
}
/*
* "findmnt" without any filter
*/
static int is_listall_mode(void)
{
if ((flags & FL_DF) && !(flags & FL_ALL))
return 0;
return (!get_match(COL_SOURCE) &&
!get_match(COL_TARGET) &&
!get_match(COL_FSTYPE) &&
!get_match(COL_OPTIONS) &&
!get_match(COL_MAJMIN));
}
/*
* Returns 1 if the @act is in the --poll=<list>
*/
static int has_poll_action(int act)
{
int i;
if (!nactions)
return 1; /* all actions enabled */
for (i = 0; i < nactions; i++)
if (actions[i] == act)
return 1;
return 0;
}
static int poll_action_name_to_id(const char *name, size_t namesz)
{
int id = -1;
if (strncasecmp(name, "move", namesz) == 0 && namesz == 4)
id = MNT_TABDIFF_MOVE;
else if (strncasecmp(name, "mount", namesz) == 0 && namesz == 5)
id = MNT_TABDIFF_MOUNT;
else if (strncasecmp(name, "umount", namesz) == 0 && namesz == 6)
id = MNT_TABDIFF_UMOUNT;
else if (strncasecmp(name, "remount", namesz) == 0 && namesz == 7)
id = MNT_TABDIFF_REMOUNT;
else
warnx(_("unknown action: %s"), name);
return id;
}
/*
* findmnt --first-only <devname|TAG=|mountpoint>
*
* ... it works like "mount <devname|TAG=|mountpoint>"
*/
static int is_mount_compatible_mode(void)
{
if (!get_match(COL_SOURCE))
return 0; /* <devname|TAG=|mountpoint> is required */
if (get_match(COL_FSTYPE) || get_match(COL_OPTIONS))
return 0; /* cannot be restricted by -t or -O */
if (!(flags & FL_FIRSTONLY))
return 0; /* we have to return the first entry only */
return 1; /* ok */
}
static void disable_columns_truncate(void)
{
int i;
for (i = 0; i < FINDMNT_NCOLUMNS; i++)
infos[i].flags &= ~TT_FL_TRUNC;
}
/*
* converts @name to column ID
*/
static int column_name_to_id(const char *name, size_t namesz)
{
int i;
for (i = 0; i < FINDMNT_NCOLUMNS; i++) {
const char *cn = column_id_to_name(i);
if (!strncasecmp(name, cn, namesz) && !*(cn + namesz))
return i;
}
warnx(_("unknown column: %s"), name);
return -1;
}
/* Returns LABEL or UUID */
static const char *get_tag(struct libmnt_fs *fs, const char *tagname)
{
const char *t, *v, *res;
if (!mnt_fs_get_tag(fs, &t, &v) && !strcmp(t, tagname))
res = v;
else {
res = mnt_fs_get_source(fs);
if (res)
res = mnt_resolve_spec(res, cache);
if (res)
res = mnt_cache_find_tag_value(cache, res, tagname);
}
return res;
}
static const char *get_vfs_attr(struct libmnt_fs *fs, int sizetype)
{
struct statvfs buf;
uint64_t vfs_attr = 0;
char *sizestr;
if (statvfs(mnt_fs_get_target(fs), &buf) != 0)
return NULL;
switch(sizetype) {
case COL_SIZE:
vfs_attr = buf.f_frsize * buf.f_blocks;
break;
case COL_AVAIL:
vfs_attr = buf.f_frsize * buf.f_bfree;
break;
case COL_USED:
vfs_attr = buf.f_frsize * (buf.f_blocks - buf.f_bfree);
break;
case COL_USEPERC:
if (buf.f_blocks == 0)
return "-";
xasprintf(&sizestr, "%.0f%%",
(double)(buf.f_blocks - buf.f_bfree) /
buf.f_blocks * 100);
return sizestr;
}
return vfs_attr == 0 ? "0" :
size_to_human_string(SIZE_SUFFIX_1LETTER, vfs_attr);
}
/* reads FS data from libmount
*/
static const char *get_data(struct libmnt_fs *fs, int num)
{
const char *str = NULL;
int col_id = get_column_id(num);
switch (col_id) {
case COL_SOURCE:
{
const char *root = mnt_fs_get_root(fs);
str = mnt_fs_get_srcpath(fs);
if (str && (flags & FL_CANONICALIZE))
str = mnt_resolve_path(str, cache);
if (!str) {
str = mnt_fs_get_source(fs);
if (str && (flags & FL_EVALUATE))
str = mnt_resolve_spec(str, cache);
}
if (root && str && !(flags & FL_NOFSROOT) && strcmp(root, "/")) {
char *tmp;
if (xasprintf(&tmp, "%s[%s]", str, root) > 0)
str = tmp;
}
break;
}
case COL_TARGET:
str = mnt_fs_get_target(fs);
break;
case COL_FSTYPE:
str = mnt_fs_get_fstype(fs);
break;
case COL_OPTIONS:
str = mnt_fs_get_options(fs);
break;
case COL_VFS_OPTIONS:
str = mnt_fs_get_vfs_options(fs);
break;
case COL_FS_OPTIONS:
str = mnt_fs_get_fs_options(fs);
break;
case COL_UUID:
str = get_tag(fs, "UUID");
break;
case COL_PARTUUID:
str = get_tag(fs, "PARTUUID");
break;
case COL_LABEL:
str = get_tag(fs, "LABEL");
break;
case COL_PARTLABEL:
str = get_tag(fs, "PARTLABEL");
break;
case COL_MAJMIN:
{
dev_t devno = mnt_fs_get_devno(fs);
if (devno) {
char *tmp;
int rc = 0;
if ((tt_flags & TT_FL_RAW) || (tt_flags & TT_FL_EXPORT))
rc = xasprintf(&tmp, "%u:%u",
major(devno), minor(devno));
else
rc = xasprintf(&tmp, "%3u:%-3u",
major(devno), minor(devno));
if (rc)
str = tmp;
}
break;
}
case COL_SIZE:
case COL_AVAIL:
case COL_USED:
case COL_USEPERC:
str = get_vfs_attr(fs, col_id);
break;
default:
break;
}
return str;
}
static const char *get_tabdiff_data(struct libmnt_fs *old_fs,
struct libmnt_fs *new_fs,
int change,
int num)
{
const char *str = NULL;
switch (get_column_id(num)) {
case COL_ACTION:
switch (change) {
case MNT_TABDIFF_MOUNT:
str = _("mount");
break;
case MNT_TABDIFF_UMOUNT:
str = _("umount");
break;
case MNT_TABDIFF_REMOUNT:
str = _("remount");
break;
case MNT_TABDIFF_MOVE:
str = _("move");
break;
default:
str = _("unknown");
break;
}
break;
case COL_OLD_OPTIONS:
if (old_fs && (change == MNT_TABDIFF_REMOUNT ||
change == MNT_TABDIFF_UMOUNT))
str = mnt_fs_get_options(old_fs);
break;
case COL_OLD_TARGET:
if (old_fs && (change == MNT_TABDIFF_MOVE ||
change == MNT_TABDIFF_UMOUNT))
str = mnt_fs_get_target(old_fs);
break;
default:
if (new_fs)
str = get_data(new_fs, num);
else
str = get_data(old_fs, num);
break;
}
return str;
}
/* adds one line to the output @tab */
static struct tt_line *add_line(struct tt *tt, struct libmnt_fs *fs,
struct tt_line *parent)
{
int i;
struct tt_line *line = tt_add_line(tt, parent);
if (!line) {
warn(_("failed to add line to output"));
return NULL;
}
for (i = 0; i < ncolumns; i++)
tt_line_set_data(line, i, get_data(fs, i));
tt_line_set_userdata(line, fs);
return line;
}
static struct tt_line *add_tabdiff_line(struct tt *tt, struct libmnt_fs *new_fs,
struct libmnt_fs *old_fs, int change)
{
int i;
struct tt_line *line = tt_add_line(tt, NULL);
if (!line) {
warn(_("failed to add line to output"));
return NULL;
}
for (i = 0; i < ncolumns; i++)
tt_line_set_data(line, i,
get_tabdiff_data(old_fs, new_fs, change, i));
return line;
}
static int has_line(struct tt *tt, struct libmnt_fs *fs)
{
struct list_head *p;
list_for_each(p, &tt->tb_lines) {
struct tt_line *ln = list_entry(p, struct tt_line, ln_lines);
if ((struct libmnt_fs *) ln->userdata == fs)
return 1;
}
return 0;
}
/* reads filesystems from @tb (libmount) and fillin @tt (output table) */
static int create_treenode(struct tt *tt, struct libmnt_table *tb,
struct libmnt_fs *fs, struct tt_line *parent_line)
{
struct libmnt_fs *chld = NULL;
struct libmnt_iter *itr = NULL;
struct tt_line *line;
int rc = -1;
if (!fs) {
/* first call, get root FS */
if (mnt_table_get_root_fs(tb, &fs))
goto leave;
parent_line = NULL;
} else if ((flags & FL_SUBMOUNTS) && has_line(tt, fs))
return 0;
itr = mnt_new_iter(MNT_ITER_FORWARD);
if (!itr)
goto leave;
line = add_line(tt, fs, parent_line);
if (!line)
goto leave;
/*
* add all children to the output table
*/
while(mnt_table_next_child_fs(tb, itr, fs, &chld) == 0) {
if (create_treenode(tt, tb, chld, line))
goto leave;
}
rc = 0;
leave:
mnt_free_iter(itr);
return rc;
}
/* error callback */
static int parser_errcb(struct libmnt_table *tb __attribute__ ((__unused__)),
const char *filename, int line)
{
warnx(_("%s: parse error at line %d"), filename, line);
return 0;
}
static char **append_tabfile(char **files, int *nfiles, char *filename)
{
files = xrealloc(files, sizeof(char *) * (*nfiles + 1));
files[(*nfiles)++] = filename;
return files;
}
/* calls libmount fstab/mtab/mountinfo parser */
static struct libmnt_table *parse_tabfiles(char **files,
int nfiles,
int tabtype)
{
struct libmnt_table *tb;
int rc = 0;
tb = mnt_new_table();
if (!tb) {
warn(_("failed to initialize libmount table"));
return NULL;
}
mnt_table_set_parser_errcb(tb, parser_errcb);
do {
/* NULL means that libmount will use default paths */
const char *path = nfiles ? *files++ : NULL;
switch (tabtype) {
case TABTYPE_FSTAB:
rc = mnt_table_parse_fstab(tb, path);
break;
case TABTYPE_MTAB:
rc = mnt_table_parse_mtab(tb, path);
break;
case TABTYPE_KERNEL:
if (!path)
path = access(_PATH_PROC_MOUNTINFO, R_OK) == 0 ?
_PATH_PROC_MOUNTINFO :
_PATH_PROC_MOUNTS;
rc = mnt_table_parse_file(tb, path);
break;
}
if (rc) {
mnt_free_table(tb);
warn(_("can't read %s"), path);
return NULL;
}
} while (--nfiles > 0);
return tb;
}
/* checks if @tb contains parent->child relations */
static int tab_is_tree(struct libmnt_table *tb)
{
struct libmnt_fs *fs = NULL;
struct libmnt_iter *itr = NULL;
int rc = 0;
itr = mnt_new_iter(MNT_ITER_BACKWARD);
if (!itr)
return 0;
if (mnt_table_next_fs(tb, itr, &fs) == 0)
rc = mnt_fs_get_id(fs) > 0 && mnt_fs_get_parent_id(fs) > 0;
mnt_free_iter(itr);
return rc;
}
/* filter function for libmount (mnt_table_find_next_fs()) */
static int match_func(struct libmnt_fs *fs,
void *data __attribute__ ((__unused__)))
{
int rc = flags & FL_INVERT ? 1 : 0;
const char *m;
void *md;
m = get_match(COL_TARGET);
if (m && !mnt_fs_match_target(fs, m, cache))
return rc;
m = get_match(COL_SOURCE);
if (m && !mnt_fs_match_source(fs, m, cache))
return rc;
m = get_match(COL_FSTYPE);
if (m && !mnt_fs_match_fstype(fs, m))
return rc;
m = get_match(COL_OPTIONS);
if (m && !mnt_fs_match_options(fs, m))
return rc;
md = get_match_data(COL_MAJMIN);
if (md && mnt_fs_get_devno(fs) != *((dev_t *) md))
return rc;
if ((flags & FL_DF) && !(flags & FL_ALL)) {
const char *type = mnt_fs_get_fstype(fs);
if (type && strstr(type, "tmpfs")) /* tmpfs is wanted */
return !rc;
if (mnt_fs_is_pseudofs(fs))
return rc;
}
return !rc;
}
/* iterate over filesystems in @tb */
static struct libmnt_fs *get_next_fs(struct libmnt_table *tb,
struct libmnt_iter *itr)
{
struct libmnt_fs *fs = NULL;
if (is_listall_mode()) {
/*
* Print whole file
*/
if (mnt_table_next_fs(tb, itr, &fs) != 0)
return NULL;
} else if (is_mount_compatible_mode()) {
/*
* Look up for FS in the same way how mount(8) searchs in fstab
*
* findmnt -f <spec>
*/
fs = mnt_table_find_source(tb, get_match(COL_SOURCE),
mnt_iter_get_direction(itr));
if (!fs && !(flags & FL_NOSWAPMATCH))
fs = mnt_table_find_target(tb, get_match(COL_SOURCE),
mnt_iter_get_direction(itr));
} else {
/*
* Look up for all matching entries
*
* findmnt [-l] <source> <target> [-O <options>] [-t <types>]
* findmnt [-l] <spec> [-O <options>] [-t <types>]
*/
again:
mnt_table_find_next_fs(tb, itr, match_func, NULL, &fs);
if (!fs &&
!(flags & FL_NOSWAPMATCH) &&
!get_match(COL_TARGET) && get_match(COL_SOURCE)) {
/* swap 'spec' and target. */
set_match(COL_TARGET, get_match(COL_SOURCE));
set_match(COL_SOURCE, NULL);
mnt_reset_iter(itr, -1);
goto again;
}
}
return fs;
}
static int add_matching_lines(struct libmnt_table *tb,
struct tt *tt, int direction)
{
struct libmnt_iter *itr = NULL;
struct libmnt_fs *fs;
int nlines = 0, rc = -1;
itr = mnt_new_iter(direction);
if (!itr) {
warn(_("failed to initialize libmount iterator"));
goto done;
}
while((fs = get_next_fs(tb, itr))) {
if ((tt_flags & TT_FL_TREE) || (flags & FL_SUBMOUNTS))
rc = create_treenode(tt, tb, fs, NULL);
else
rc = !add_line(tt, fs, NULL);
if (rc)
goto done;
nlines++;
if (flags & FL_FIRSTONLY)
break;
flags |= FL_NOSWAPMATCH;
}
if (nlines)
rc = 0;
done:
mnt_free_iter(itr);
return rc;
}
static int poll_match(struct libmnt_fs *fs)
{
int rc = match_func(fs, NULL);
if (rc == 0 && !(flags & FL_NOSWAPMATCH) &&
get_match(COL_SOURCE) && !get_match(COL_TARGET)) {
/*
* findmnt --poll /foo
* The '/foo' maybe source as well as target.
*/
const char *str = get_match(COL_SOURCE);
set_match(COL_TARGET, str); /* swap */
set_match(COL_SOURCE, NULL);
rc = match_func(fs, NULL);
set_match(COL_TARGET, NULL); /* restore */
set_match(COL_SOURCE, str);
}
return rc;
}
static int poll_table(struct libmnt_table *tb, const char *tabfile,
int timeout, struct tt *tt, int direction)
{
FILE *f = NULL;
int rc = -1;
struct libmnt_iter *itr = NULL;
struct libmnt_table *tb_new = NULL;
struct libmnt_tabdiff *diff = NULL;
struct pollfd fds[1];
tb_new = mnt_new_table();
if (!tb_new) {
warn(_("failed to initialize libmount table"));
goto done;
}
itr = mnt_new_iter(direction);
if (!itr) {
warn(_("failed to initialize libmount iterator"));
goto done;
}
diff = mnt_new_tabdiff();
if (!diff) {
warn(_("failed to initialize libmount tabdiff"));
goto done;
}
/* cache is unnecessary to detect changes */
mnt_table_set_cache(tb, NULL);
mnt_table_set_cache(tb_new, NULL);
f = fopen(tabfile, "r");
if (!f) {
warn(_("%s: open failed"), tabfile);
goto done;
}
mnt_table_set_parser_errcb(tb_new, parser_errcb);
fds[0].fd = fileno(f);
fds[0].events = POLLPRI;
while (1) {
struct libmnt_table *tmp;
struct libmnt_fs *old, *new;
int change, count;
count = poll(fds, 1, timeout);
if (count == 0)
break; /* timeout */
if (count < 0) {
warn(_("poll() failed"));
goto done;
}
rewind(f);
rc = mnt_table_parse_stream(tb_new, f, tabfile);
if (!rc)
rc = mnt_diff_tables(diff, tb, tb_new);
if (rc < 0)
goto done;
count = 0;
mnt_reset_iter(itr, direction);
while(mnt_tabdiff_next_change(
diff, itr, &old, &new, &change) == 0) {
if (!has_poll_action(change))
continue;
if (!poll_match(new ? new : old))
continue;
count++;
rc = !add_tabdiff_line(tt, new, old, change);
if (rc)
goto done;
if (flags & FL_FIRSTONLY)
break;
}
if (count) {
rc = tt_print_table(tt);
if (rc)
goto done;
}
/* swap tables */
tmp = tb;
tb = tb_new;
tb_new = tmp;
tt_remove_lines(tt);
mnt_reset_table(tb_new);
if (count && (flags & FL_FIRSTONLY))
break;
}
rc = 0;
done:
mnt_free_table(tb_new);
mnt_free_tabdiff(diff);
mnt_free_iter(itr);
if (f)
fclose(f);
return rc;
}
static void __attribute__((__noreturn__)) usage(FILE *out)
{
int i;
fputs(USAGE_HEADER, out);
fprintf(out, _(
" %1$s [options]\n"
" %1$s [options] <device> | <mountpoint>\n"
" %1$s [options] <device> <mountpoint>\n"
" %1$s [options] [--source <device>] [--target <mountpoint>]\n"),
program_invocation_short_name);
fprintf(out, _(
"\nOptions:\n"
" -s, --fstab search in static table of filesystems\n"
" -m, --mtab search in table of mounted filesystems\n"
" -k, --kernel search in kernel table of mounted\n"
" filesystems (default)\n\n"));
fprintf(out, _(
" -p, --poll[=<list>] monitor changes in table of mounted filesystems\n"
" -w, --timeout <num> upper limit in milliseconds that --poll will block\n\n"));
fprintf(out, _(
" -A, --all disable all built-in filters, print all filesystems\n"
" -a, --ascii use ASCII chars for tree formatting\n"
" -c, --canonicalize canonicalize printed paths\n"
" -D, --df imitate the output of df(1)\n"
" -d, --direction <word> direction of search, 'forward' or 'backward'\n"
" -e, --evaluate convert tags (LABEL,UUID,PARTUUID,PARTLABEL) \n"
" to device names\n"
" -F, --tab-file <path> alternative file for --fstab, --mtab or --kernel options\n"
" -f, --first-only print the first found filesystem only\n"));
fprintf(out, _(
" -i, --invert invert the sense of matching\n"
" -l, --list use list format output\n"
" -n, --noheadings don't print column headings\n"
" -u, --notruncate don't truncate text in columns\n"));
fprintf(out, _(
" -O, --options <list> limit the set of filesystems by mount options\n"
" -o, --output <list> the output columns to be shown\n"
" -P, --pairs use key=\"value\" output format\n"
" -r, --raw use raw output format\n"
" -t, --types <list> limit the set of filesystems by FS types\n"));
fprintf(out, _(
" -v, --nofsroot don't print [/dir] for bind or btrfs mounts\n"
" -R, --submounts print all submounts for the matching filesystems\n"
" -S, --source <string> the device to mount (by name, maj:min, \n"
" LABEL=, UUID=, PARTUUID=, PARTLABEL=)\n"
" -T, --target <string> the mountpoint to use\n"));
fputs(USAGE_SEPARATOR, out);
fputs(USAGE_HELP, out);