/*
* findmnt(8)
*
* Copyright (C) 2010 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <err.h>
#include <unistd.h>
#include <getopt.h>
#include <string.h>
#include <termios.h>
#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#include <assert.h>
#define USE_UNSTABLE_LIBMOUNT_API
#include <mount.h>
#include "pathnames.h"
#include "nls.h"
#include "c.h"
#include "tt.h"
/* flags */
enum {
FL_EVALUATE = (1 << 1),
FL_CANONICALIZE = (1 << 2),
FL_FIRSTONLY = (1 << 3),
FL_INVERT = (1 << 4),
FL_NOSWAPMATCH = (1 << 6),
};
/* column IDs */
enum {
COL_SOURCE,
COL_TARGET,
COL_FSTYPE,
COL_OPTIONS,
COL_VFS_OPTIONS,
COL_FS_OPTIONS,
COL_LABEL,
COL_UUID,
__NCOLUMNS
};
/* column names */
struct colinfo {
const char *name; /* header */
double whint; /* width hint (N < 1 is in percent of termwidth) */
int truncate; /* boolean */
const char *match; /* pattern for match_func() */
};
/* columns descriptions */
struct colinfo infos[__NCOLUMNS] = {
[COL_SOURCE] = { "SOURCE", 0.25, FALSE },
[COL_TARGET] = { "TARGET", 0.30, FALSE },
[COL_FSTYPE] = { "FSTYPE", 0.10, TRUE },
[COL_OPTIONS] = { "OPTIONS", 0.10, TRUE },
[COL_VFS_OPTIONS] = { "VFS-OPTIONS", 0.20, TRUE },
[COL_FS_OPTIONS] = { "FS-OPTIONS", 0.10, TRUE },
[COL_LABEL] = { "LABEL", 0.10, FALSE },
[COL_UUID] = { "UUID", 36, FALSE },
};
/* global flags */
int flags;
/* array with IDs of enabled columns */
int columns[__NCOLUMNS];
int ncolumns;
/* libmount cache */
mnt_cache *cache;
static int get_column_id(int num)
{
assert(num < ncolumns);
assert(columns[num] < __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 < __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_truncate(int num)
{
return get_column_info(num)->truncate;
}
static const char *get_match(int id)
{
assert(id < __NCOLUMNS);
return infos[id].match;
}
static void set_match(int id, const char *match)
{
assert(id < __NCOLUMNS);
infos[id].match = match;
}
/*
* "findmnt" without any filter
*/
static int is_listall_mode(void)
{
return (!get_match(COL_SOURCE) &&
!get_match(COL_TARGET) &&
!get_match(COL_FSTYPE) &&
!get_match(COL_OPTIONS));
}
/*
* 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 set_all_columns_truncate(int set)
{
int i;
for (i = 0; i < __NCOLUMNS; i++)
infos[i].truncate = set;
}
/*
* converts @name to column ID
*/
static int column_name_to_id(const char *name, size_t namesz)
{
int i;
for (i = 0; i < __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;
}
/*
* parses list of columns from @str and add IDs to columns[]
*/
static int set_columns(const char *str)
{
const char *begin = NULL, *p;
ncolumns = 0;
if (!str || !*str)
return -1;
ncolumns = 0;
for (p = str; p && *p; p++) {
const char *end = NULL;
int id;
if (!begin)
begin = p; /* begin of the column name */
if (*p == ',')
end = p; /* terminate the name */
if (*(p + 1) == '\0')
end = p + 1; /* end of string */
if (!begin || !end)
continue;
if (end <= begin)
return -1;
id = column_name_to_id(begin, end - begin);
if (id == -1)
return -1;
columns[ ncolumns++ ] = id;
begin = NULL;
if (end && !*end)
break;
}
return 0;
}
/* Returns LABEL or UUID */
static const char *get_tag(mnt_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;
}
/* reads FS data from libmount */
static const char *get_data(mnt_fs *fs, int num)
{
const char *str = NULL;
switch(get_column_id(num)) {
case COL_SOURCE:
/* dir or dev */
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);
}
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_optstr(fs);
break;
case COL_VFS_OPTIONS:
str = mnt_fs_get_vfs_optstr(fs);
break;
case COL_FS_OPTIONS:
str = mnt_fs_get_fs_optstr(fs);
break;
case COL_UUID:
str = get_tag(fs, "UUID");
break;
case COL_LABEL:
str = get_tag(fs, "LABEL");
break;
default:
break;
}
return str;
}
/* adds one line to the output @tab */
static struct tt_line *add_line(struct tt *tt, mnt_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));
return line;
}
/* reads filesystems from @tb (libmount) and fillin @tab (output table) */
static int create_treenode(struct tt *tt, mnt_tab *tb,
mnt_fs *fs, struct tt_line *parent_line)
{
mnt_fs *chld = NULL;
mnt_iter *itr = NULL;
struct tt_line *line;
int rc = -1;
if (!fs) {
/* first call, get root FS */
if (mnt_tab_get_root_fs(tb, &fs))
goto leave;
parent_line = NULL;
}
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_tab_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;
}
/* calls libmount fstab/mtab/mountinfo parser */
static mnt_tab *parse_tabfile(const char *path)
{
mnt_tab *tb = mnt_new_tab(path);
if (!tb) {
warn(_("failed to initialize libmount tab"));
return NULL;
}
if (mnt_tab_parse_file(tb) != 0) {
mnt_free_tab(tb);
warn(_("can't read: %s"), path);
return NULL;
}
if (mnt_tab_get_nerrs(tb)) {
char buf[BUFSIZ];
mnt_tab_strerror(tb, buf, sizeof(buf));
warnx(_("%s: parse error: %s"), path, buf);
}
return tb;
}
/* filter function for libmount (mnt_tab_find_next_fs()) */
static int match_func(mnt_fs *fs, void *data)
{
int rc = flags & FL_INVERT ? 1 : 0;
const char *m;
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;
return !rc;
}
/* iterate over filesystems in @tb */
static mnt_fs *get_next_fs(mnt_tab *tb, mnt_iter *itr)
{
mnt_fs *fs = NULL;
if (is_listall_mode()) {
/*
* Print whole file
*/
mnt_tab_next_fs(tb, itr, &fs);
} 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_tab_find_source(tb, get_match(COL_SOURCE),
mnt_iter_get_direction(itr));
if (!fs)
fs = mnt_tab_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_tab_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 __attribute__((__noreturn__)) usage(FILE *out)
{
fprintf(out, _(
"\nUsage:\n"
" %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"
" -c, --canonicalize canonicalize printed paths\n"
" -d, --direction <word> search direction - 'forward' or 'backward'\n"
" -e, --evaluate print all TAGs (LABEL/UUID) evaluated\n"
" -f, --first-only print the first found filesystem only\n"
" -h, --help print this help\n"
" -i, --invert invert sense of matching\n"
" -l, --list use list format ouput\n"
" -n, --noheadings don't print headings\n"
" -u, --notruncate don't truncate text in columns\n"
" -O, --options <list> limit the set of filesystems by mount options\n"
" -o, --output <list> output columns\n"
" -r, --raw use raw format output\n"
" -a, --ascii use ascii chars for tree formatting\n"
" -t, --types <list> limit the set of filesystem by FS types\n"
" -S, --source <string> device, LABEL= or UUID=device\n"
" -T, --target <string> mountpoint\n\n"));
fprintf(out, _("\nFor more information see findmnt(1).\n"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
static int __attribute__((__noreturn__))
errx_mutually_exclusive(const char *opts)
{
errx(EXIT_FAILURE, "%s %s", opts, _("options are mutually exclusive"));
}
int main(int argc, char *argv[])
{
/* libmount */
mnt_tab *tb = NULL;
mnt_iter *itr = NULL;
mnt_fs *fs = NULL;
char *tabfile = NULL;
int direction = MNT_ITER_FORWARD;
/* table.h */
struct tt *tt = NULL;
int tt_flags = 0;
int i, c, rc = EXIT_FAILURE;
struct option longopts[] = {
{ "ascii", 0, 0, 'a' },
{ "canonicalize", 0, 0, 'c' },
{ "direction", 1, 0, 'd' },
{ "evaluate", 0, 0, 'e' },
{ "first-only", 0, 0, 'f' },
{ "fstab", 0, 0, 's' },
{ "help", 0, 0, 'h' },
{ "invert", 0, 0, 'i' },
{ "kernel", 0, 0, 'k' },
{ "list", 0, 0, 'l' },
{ "mtab", 0, 0, 'm' },
{ "noheadings", 0, 0, 'n' },
{ "notruncate", 0, 0, 'u' },
{ "options", 1, 0, 'O' },
{ "output", 1, 0, 'o' },
{ "raw", 0, 0, 'r' },
{ "types", 1, 0, 't' },
{ "source", 1, 0, 'S' },
{ "target", 1, 0, 'T' },
{ NULL, 0, 0, 0 }
};
assert(ARRAY_SIZE(columns) == __NCOLUMNS);
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
/* default enabled columns */
columns[ncolumns++] = COL_TARGET;
columns[ncolumns++] = COL_SOURCE;
columns[ncolumns++] = COL_FSTYPE;
columns[ncolumns++] = COL_OPTIONS;
/* default output format */
tt_flags |= TT_FL_TREE;
while ((c = getopt_long(argc, argv,
"cd:ehifo:O:klmnrst:uS:T:", longopts, NULL)) != -1) {
switch(c) {
case 'a':
tt_flags |= TT_FL_ASCII;
break;
case 'c':
flags |= FL_CANONICALIZE;
break;
case 'd':
if (!strcmp(optarg, "forward"))
direction = MNT_ITER_FORWARD;
else if (!strcmp(optarg, "backward"))
direction = MNT_ITER_BACKWARD;
else
errx(EXIT_FAILURE,
_("unknown direction '%s'"), optarg);
break;
case 'e':
flags |= FL_EVALUATE;
break;
case 'h':
usage(stdout);
break;
case 'i':
flags |= FL_INVERT;
break;
case 'f':
flags |= FL_FIRSTONLY;
break;
case 'u':
set_all_columns_truncate(FALSE);
break;
case 'o':
if (set_columns(optarg))
exit(EXIT_FAILURE);
break;
case 'O':
set_match(COL_OPTIONS, optarg);
break;
case 'm': /* mtab */
if (tabfile)
errx_mutually_exclusive("--{fstab,mtab,kernel}");
tabfile = _PATH_MOUNTED;
tt_flags &= ~TT_FL_TREE;
break;
case 's': /* fstab */
if (tabfile)
errx_mutually_exclusive("--{fstab,mtab,kernel}");
tabfile = _PATH_MNTTAB;
tt_flags &= ~TT_FL_TREE;
break;
case 'k': /* kernel (mountinfo) */
if (tabfile)
errx_mutually_exclusive("--{fstab,mtab,kernel}");
tabfile = _PATH_PROC_MOUNTINFO;
break;
case 't':
set_match(COL_FSTYPE, optarg);
break;
case 'r':
tt_flags &= ~TT_FL_TREE; /* disable the default */
tt_flags |= TT_FL_RAW; /* enable raw */
break;
case 'l':
if (tt_flags & TT_FL_RAW)
errx_mutually_exclusive("--{raw,list}");
tt_flags &= ~TT_FL_TREE; /* disable the default */
break;
case 'n':
tt_flags |= TT_FL_NOHEADINGS;
break;
case 'S':
set_match(COL_SOURCE, optarg);
flags |= FL_NOSWAPMATCH;
break;
case 'T':
set_match(COL_TARGET, optarg);
flags |= FL_NOSWAPMATCH;
break;
default:
usage(stderr);
break;
}
}
if (!tabfile) {
tabfile = _PATH_PROC_MOUNTINFO;
if (access(tabfile, R_OK)) { /* old kernel? */
tabfile = _PATH_PROC_MOUNTS;
tt_flags &= ~TT_FL_TREE;
}
}
if (optind < argc && (get_match(COL_SOURCE) || get_match(COL_TARGET)))
errx(EXIT_FAILURE, _(
"options --target and --source can't be used together "
"with command line element that is not an option"));
if (optind < argc)
set_match(COL_SOURCE, argv[optind++]); /* dev/tag/mountpoint */
if (optind < argc)
set_match(COL_TARGET, argv[optind++]); /* mountpoint */
if (!is_listall_mode() || (flags & FL_FIRSTONLY))
tt_flags &= ~TT_FL_TREE;
if (!(flags & FL_NOSWAPMATCH) &&
!get_match(COL_TARGET) && get_match(COL_SOURCE)) {
/*
* Check if we can swap source and target, it's
* not possible if the source is LABEL=/UUID=
*/
const char *x = get_match(COL_SOURCE);
if (!strncmp(x, "LABEL=", 6) || !strncmp(x, "UUID=", 5))
flags |= FL_NOSWAPMATCH;
}
/*
* initialize libmount
*/
mnt_init_debug(0);
tb = parse_tabfile(tabfile);
if (!tb)
goto leave;
itr = mnt_new_iter(direction);
if (!itr) {
warn(_("failed to initialize libmount iterator"));
goto leave;
}
cache = mnt_new_cache();
if (!cache) {
warn(_("failed to initialize libmount cache"));
goto leave;
}
mnt_tab_set_cache(tb, cache);
/*
* initialize output formatting (tt.h)
*/
tt = tt_new_table(tt_flags);
if (!tt) {
warn(_("failed to initialize output table"));
goto leave;
}
for (i = 0; i < ncolumns; i++) {
int fl = get_column_truncate(i) ? TT_FL_TRUNCATE : 0;
if (get_column_id(i) == COL_TARGET && (tt_flags & TT_FL_TREE))
fl |= TT_FL_TREE;
if (!tt_define_column(tt, get_column_name(i),
get_column_whint(i), fl)) {
warn(_("failed to initialize output column"));
goto leave;
}
}
/*
* Fill in data to the output table
*/
if (tt_flags & TT_FL_TREE) {
if (create_treenode(tt, tb, NULL, NULL))
goto leave;
} else {
while((fs = get_next_fs(tb, itr))) {
if (!add_line(tt, fs, NULL))
goto leave;
if (flags & FL_FIRSTONLY)
break;
}
}
/*
* Print the output table
*/
tt_print_table(tt);
rc = EXIT_SUCCESS;
leave:
tt_free_table(tt);
mnt_free_tab(tb);
mnt_free_cache(cache);
mnt_free_iter(itr);
return rc;
}
