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Diffstat (limited to 'misc-utils/findmnt.c')
| -rw-r--r-- | misc-utils/findmnt.c | 1723 |
1 files changed, 1723 insertions, 0 deletions
diff --git a/misc-utils/findmnt.c b/misc-utils/findmnt.c new file mode 100644 index 0000000..331460b --- /dev/null +++ b/misc-utils/findmnt.c @@ -0,0 +1,1723 @@ +/* + * findmnt(8) + * + * Copyright (C) 2010-2015 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> +#ifdef HAVE_LIBUDEV +# include <libudev.h> +#endif +#include <libmount.h> +#include <libsmartcols.h> + +#include "pathnames.h" +#include "nls.h" +#include "closestream.h" +#include "c.h" +#include "strutils.h" +#include "xalloc.h" +#include "optutils.h" +#include "mangle.h" + +#include "findmnt.h" + +/* 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, + COL_FSROOT, + COL_TID, + COL_ID, + COL_OPT_FIELDS, + COL_PROPAGATION, + COL_FREQ, + COL_PASSNO +}; + +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; /* libsmartcols 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[] = { + [COL_SOURCE] = { "SOURCE", 0.25, SCOLS_FL_NOEXTREMES, N_("source device") }, + [COL_TARGET] = { "TARGET", 0.30, SCOLS_FL_TREE| SCOLS_FL_NOEXTREMES, N_("mountpoint") }, + [COL_FSTYPE] = { "FSTYPE", 0.10, SCOLS_FL_TRUNC, N_("filesystem type") }, + [COL_OPTIONS] = { "OPTIONS", 0.10, SCOLS_FL_TRUNC, N_("all mount options") }, + [COL_VFS_OPTIONS] = { "VFS-OPTIONS", 0.20, SCOLS_FL_TRUNC, N_("VFS specific mount options") }, + [COL_FS_OPTIONS] = { "FS-OPTIONS", 0.10, SCOLS_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, SCOLS_FL_STRICTWIDTH, N_("action detected by --poll") }, + [COL_OLD_OPTIONS] = { "OLD-OPTIONS", 0.10, SCOLS_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, SCOLS_FL_RIGHT, N_("filesystem size") }, + [COL_AVAIL] = { "AVAIL", 5, SCOLS_FL_RIGHT, N_("filesystem size available") }, + [COL_USED] = { "USED", 5, SCOLS_FL_RIGHT, N_("filesystem size used") }, + [COL_USEPERC] = { "USE%", 3, SCOLS_FL_RIGHT, N_("filesystem use percentage") }, + [COL_FSROOT] = { "FSROOT", 0.25, SCOLS_FL_NOEXTREMES, N_("filesystem root") }, + [COL_TID] = { "TID", 4, SCOLS_FL_RIGHT, N_("task ID") }, + [COL_ID] = { "ID", 2, SCOLS_FL_RIGHT, N_("mount ID") }, + [COL_OPT_FIELDS] = { "OPT-FIELDS", 0.10, SCOLS_FL_TRUNC, N_("optional mount fields") }, + [COL_PROPAGATION] = { "PROPAGATION", 0.10, 0, N_("VFS propagation flags") }, + [COL_FREQ] = { "FREQ", 1, SCOLS_FL_RIGHT, N_("dump(8) period in days [fstab only]") }, + [COL_PASSNO] = { "PASSNO", 1, SCOLS_FL_RIGHT, N_("pass number on parallel fsck(8) [fstab only]") } +}; + +/* columns[] array specifies all currently wanted output column. The columns + * are defined by infos[] array and you can specify (on command line) each + * column twice. That's enough, dynamically allocated array of the columns is + * unnecessary overkill and over-engineering in this case */ +static int columns[ARRAY_SIZE(infos) * 2]; +static size_t ncolumns; + +static inline size_t err_columns_index(size_t arysz, size_t idx) +{ + if (idx >= arysz) + errx(EXIT_FAILURE, _("too many columns specified, " + "the limit is %zu columns"), + arysz - 1); + return idx; +} + +#define add_column(ary, n, id) \ + ((ary)[ err_columns_index(ARRAY_SIZE(ary), (n)) ] = (id)) + +/* poll actions (parsed --poll=<list> */ +#define FINDMNT_NACTIONS 4 /* mount, umount, move, remount */ +static int actions[FINDMNT_NACTIONS]; +static int nactions; + +/* global (accessed from findmnt-verify.c too) */ +int flags; +int parse_nerrors; +struct libmnt_cache *cache; + + +#ifdef HAVE_LIBUDEV +static struct udev *udev; +#endif + +static int match_func(struct libmnt_fs *fs, void *data __attribute__ ((__unused__))); + + +static int get_column_id(int num) +{ + assert(num >= 0); + assert((size_t) num < ncolumns); + assert((size_t) columns[num] < ARRAY_SIZE(infos)); + 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((size_t) id < ARRAY_SIZE(infos)); + 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((size_t) id < ARRAY_SIZE(infos)); + return infos[id].match; +} + +static void *get_match_data(int id) +{ + assert((size_t) id < ARRAY_SIZE(infos)); + return infos[id].match_data; +} + +static void set_match(int id, const char *match) +{ + assert((size_t) id < ARRAY_SIZE(infos)); + infos[id].match = match; +} + +static void set_match_data(int id, void *data) +{ + assert((size_t) id < ARRAY_SIZE(infos)); + 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); +} + +/* + * Extra functionality for --target <path>. The function mnt_table_find_mountpoint() + * also checks parents (path elements in reverse order) to get mountpoint. + * + * @tb has to be from kernel (so no fstab or so)! + */ +static void enable_extra_target_match(struct libmnt_table *tb) +{ + char *cn = NULL; + const char *tgt = NULL, *mnt = NULL; + struct libmnt_fs *fs; + + /* + * Check if match pattern is mountpoint, if not use the + * real mountpoint. + */ + if (flags & FL_NOCACHE) + tgt = get_match(COL_TARGET); + else { + tgt = cn = mnt_resolve_path(get_match(COL_TARGET), cache); + if (!cn) + return; + } + + fs = mnt_table_find_mountpoint(tb, tgt, MNT_ITER_BACKWARD); + if (fs) + mnt = mnt_fs_get_target(fs); + if (mnt && strcmp(mnt, tgt) != 0) + set_match(COL_TARGET, xstrdup(mnt)); /* replace the current setting */ + + if (!cache) + free(cn); +} + + +static int is_tabdiff_column(int id) +{ + assert((size_t) id < ARRAY_SIZE(infos)); + + switch(id) { + case COL_ACTION: + case COL_OLD_TARGET: + case COL_OLD_OPTIONS: + return 1; + default: + break; + } + return 0; +} + +/* + * "findmnt" without any filter + */ +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) +{ + size_t i; + + for (i = 0; i < ARRAY_SIZE(infos); i++) + infos[i].flags &= ~SCOLS_FL_TRUNC; +} + +/* + * converts @name to column ID + */ +static int column_name_to_id(const char *name, size_t namesz) +{ + size_t i; + + for (i = 0; i < ARRAY_SIZE(infos); 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; +} + + +#ifdef HAVE_LIBUDEV +static char *get_tag_from_udev(const char *devname, int col) +{ + struct udev_device *dev; + const char *data = NULL; + char *res = NULL, *path; + + if (!udev) + udev = udev_new(); + if (!udev) + return NULL; + + /* libudev don't like /dev/mapper/ symlinks */ + path = realpath(devname, NULL); + if (path) + devname = path; + + if (strncmp(devname, "/dev/", 5) == 0) + devname += 5; + + dev = udev_device_new_from_subsystem_sysname(udev, "block", devname); + free(path); + + if (!dev) + return NULL; + + switch(col) { + case COL_LABEL: + data = udev_device_get_property_value(dev, "ID_FS_LABEL_ENC"); + break; + case COL_UUID: + data = udev_device_get_property_value(dev, "ID_FS_UUID_ENC"); + break; + case COL_PARTUUID: + data = udev_device_get_property_value(dev, "ID_PART_ENTRY_UUID"); + break; + case COL_PARTLABEL: + data = udev_device_get_property_value(dev, "ID_PART_ENTRY_NAME"); + break; + default: + break; + } + + if (data) { + res = xstrdup(data); + unhexmangle_string(res); + } + + udev_device_unref(dev); + return res; +} +#endif /* HAVE_LIBUDEV */ + +/* Returns LABEL or UUID */ +static char *get_tag(struct libmnt_fs *fs, const char *tagname, int col +#ifndef HAVE_LIBUDEV + __attribute__((__unused__)) +#endif + ) +{ + const char *t, *v; + char *res = NULL; + + if (!mnt_fs_get_tag(fs, &t, &v) && !strcmp(t, tagname)) + res = xstrdup(v); + else { + const char *dev = mnt_fs_get_source(fs); + + if (dev && !(flags & FL_NOCACHE)) + dev = mnt_resolve_spec(dev, cache); +#ifdef HAVE_LIBUDEV + if (dev) + res = get_tag_from_udev(dev, col); +#endif + if (!res) { + res = mnt_cache_find_tag_value(cache, dev, tagname); + if (res && cache) + /* don't return pointer to cache */ + res = xstrdup(res); + } + } + + return res; +} + +static 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_bavail; + 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 xstrdup("-"); + + xasprintf(&sizestr, "%.0f%%", + (double)(buf.f_blocks - buf.f_bfree) / + buf.f_blocks * 100); + return sizestr; + } + + if (!vfs_attr) + sizestr = xstrdup("0"); + else if (flags & FL_BYTES) + xasprintf(&sizestr, "%ju", vfs_attr); + else + sizestr = size_to_human_string(SIZE_SUFFIX_1LETTER, vfs_attr); + + return sizestr; +} + +/* reads FS data from libmount + */ +static char *get_data(struct libmnt_fs *fs, int num) +{ + char *str = NULL; + int col_id = get_column_id(num); + + switch (col_id) { + case COL_SOURCE: + { + const char *root = mnt_fs_get_root(fs); + const char *spec = mnt_fs_get_srcpath(fs); + char *cn = NULL; + + if (spec && (flags & FL_CANONICALIZE)) + spec = cn = mnt_resolve_path(spec, cache); + if (!spec) { + spec = mnt_fs_get_source(fs); + + if (spec && (flags & FL_EVALUATE)) + spec = cn = mnt_resolve_spec(spec, cache); + } + if (root && spec && !(flags & FL_NOFSROOT) && strcmp(root, "/")) + xasprintf(&str, "%s[%s]", spec, root); + else if (spec) + str = xstrdup(spec); + if (!cache) + free(cn); + break; + } + case COL_TARGET: + str = xstrdup(mnt_fs_get_target(fs)); + break; + case COL_FSTYPE: + str = xstrdup(mnt_fs_get_fstype(fs)); + break; + case COL_OPTIONS: + str = xstrdup(mnt_fs_get_options(fs)); + break; + case COL_VFS_OPTIONS: + str = xstrdup(mnt_fs_get_vfs_options(fs)); + break; + case COL_FS_OPTIONS: + str = xstrdup(mnt_fs_get_fs_options(fs)); + break; + case COL_OPT_FIELDS: + str = xstrdup(mnt_fs_get_optional_fields(fs)); + break; + case COL_UUID: + str = get_tag(fs, "UUID", col_id); + break; + case COL_PARTUUID: + str = get_tag(fs, "PARTUUID", col_id); + break; + case COL_LABEL: + str = get_tag(fs, "LABEL", col_id); + break; + case COL_PARTLABEL: + str = get_tag(fs, "PARTLABEL", col_id); + break; + + case COL_MAJMIN: + { + dev_t devno = mnt_fs_get_devno(fs); + if (!devno) + break; + + if ((flags & FL_RAW) || (flags & FL_EXPORT) || (flags & FL_JSON)) + xasprintf(&str, "%u:%u", major(devno), minor(devno)); + else + xasprintf(&str, "%3u:%-3u", major(devno), minor(devno)); + break; + } + case COL_SIZE: + case COL_AVAIL: + case COL_USED: + case COL_USEPERC: + str = get_vfs_attr(fs, col_id); + break; + case COL_FSROOT: + str = xstrdup(mnt_fs_get_root(fs)); + break; + case COL_TID: + if (mnt_fs_get_tid(fs)) + xasprintf(&str, "%d", mnt_fs_get_tid(fs)); + break; + case COL_ID: + if (mnt_fs_get_id(fs)) + xasprintf(&str, "%d", mnt_fs_get_id(fs)); + break; + case COL_PROPAGATION: + if (mnt_fs_is_kernel(fs)) { + unsigned long fl = 0; + char *n = NULL; + + if (mnt_fs_get_propagation(fs, &fl) != 0) + break; + + n = xstrdup((fl & MS_SHARED) ? "shared" : "private"); + + if (fl & MS_SLAVE) { + xasprintf(&str, "%s,slave", n); + free(n); + n = str; + } + if (fl & MS_UNBINDABLE) { + xasprintf(&str, "%s,unbindable", n); + free(n); + n = str; + } + str = n; + } + break; + case COL_FREQ: + if (!mnt_fs_is_kernel(fs)) + xasprintf(&str, "%d", mnt_fs_get_freq(fs)); + break; + case COL_PASSNO: + if (!mnt_fs_is_kernel(fs)) + xasprintf(&str, "%d", mnt_fs_get_passno(fs)); + break; + default: + break; + } + return str; +} + +static char *get_tabdiff_data(struct libmnt_fs *old_fs, + struct libmnt_fs *new_fs, + int change, + int num) +{ + 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; + } + str = xstrdup(str); + break; + case COL_OLD_OPTIONS: + if (old_fs && (change == MNT_TABDIFF_REMOUNT || + change == MNT_TABDIFF_UMOUNT)) + str = xstrdup(mnt_fs_get_options(old_fs)); + break; + case COL_OLD_TARGET: + if (old_fs && (change == MNT_TABDIFF_MOVE || + change == MNT_TABDIFF_UMOUNT)) + str = xstrdup(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 libscols_line *add_line(struct libscols_table *table, struct libmnt_fs *fs, + struct libscols_line *parent) +{ + size_t i; + struct libscols_line *line = scols_table_new_line(table, parent); + + if (!line) + err(EXIT_FAILURE, _("failed to allocate output line")); + + for (i = 0; i < ncolumns; i++) { + if (scols_line_refer_data(line, i, get_data(fs, i))) + err(EXIT_FAILURE, _("failed to add output data")); + } + + scols_line_set_userdata(line, fs); + return line; +} + +static struct libscols_line *add_tabdiff_line(struct libscols_table *table, struct libmnt_fs *new_fs, + struct libmnt_fs *old_fs, int change) +{ + size_t i; + struct libscols_line *line = scols_table_new_line(table, NULL); + + if (!line) + err(EXIT_FAILURE, _("failed to allocate output line")); + + for (i = 0; i < ncolumns; i++) { + if (scols_line_refer_data(line, i, + get_tabdiff_data(old_fs, new_fs, change, i))) + err(EXIT_FAILURE, _("failed to add output data")); + } + + return line; +} + +static int has_line(struct libscols_table *table, struct libmnt_fs *fs) +{ + struct libscols_line *ln; + struct libscols_iter *itr; + int rc = 0; + + itr = scols_new_iter(SCOLS_ITER_FORWARD); + if (!itr) + return 0; + + while (scols_table_next_line(table, itr, &ln) == 0) { + if ((struct libmnt_fs *) scols_line_get_userdata(ln) == fs) { + rc = 1; + break; + } + } + + scols_free_iter(itr); + return rc; +} + +/* reads filesystems from @tb (libmount) and fillin @table (output table) */ +static int create_treenode(struct libscols_table *table, struct libmnt_table *tb, + struct libmnt_fs *fs, struct libscols_line *parent_line) +{ + struct libmnt_fs *chld = NULL; + struct libmnt_iter *itr = NULL; + struct libscols_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(table, fs)) + return 0; + + itr = mnt_new_iter(MNT_ITER_FORWARD); + if (!itr) + goto leave; + + if ((flags & FL_SUBMOUNTS) || match_func(fs, NULL)) { + line = add_line(table, fs, parent_line); + if (!line) + goto leave; + } else + line = parent_line; + + /* + * add all children to the output table + */ + while(mnt_table_next_child_fs(tb, itr, fs, &chld) == 0) { + if (create_treenode(table, 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 -- ignored"), filename, line); + ++parse_nerrors; + return 1; +} + +static char **append_tabfile(char **files, int *nfiles, char *filename) +{ + files = xrealloc(files, sizeof(char *) * (*nfiles + 1)); + files[(*nfiles)++] = filename; + return files; +} + +static char **append_pid_tabfile(char **files, int *nfiles, pid_t pid) +{ + char *path = NULL; + + xasprintf(&path, "/proc/%d/mountinfo", (int) pid); + return append_tabfile(files, nfiles, path); +} + +/* 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_unref_table(tb); + warn(_("can't read %s"), path); + return NULL; + } + } while (--nfiles > 0); + + return tb; +} + +/* + * Parses mountinfo and calls mnt_cache_set_targets(cache, mtab). Only + * necessary if @tb in main() was read from a non-kernel source. + */ +static void cache_set_targets(struct libmnt_cache *tmp) +{ + struct libmnt_table *tb; + const char *path; + + tb = mnt_new_table(); + if (!tb) + return; + + path = access(_PATH_PROC_MOUNTINFO, R_OK) == 0 ? + _PATH_PROC_MOUNTINFO : + _PATH_PROC_MOUNTS; + + if (mnt_table_parse_file(tb, path) == 0) + mnt_cache_set_targets(tmp, tb); + + mnt_unref_table(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; + int rc = 0; + + itr = mnt_new_iter(MNT_ITER_BACKWARD); + if (!itr) + return 0; + + rc = (mnt_table_next_fs(tb, itr, &fs) == 0 && + mnt_fs_is_kernel(fs) && + mnt_fs_get_root(fs)); + + mnt_free_iter(itr); + return rc; +} + +/* checks if all fs in @tb are from kernel */ +static int tab_is_kernel(struct libmnt_table *tb) +{ + struct libmnt_fs *fs = NULL; + struct libmnt_iter *itr; + + itr = mnt_new_iter(MNT_ITER_BACKWARD); + if (!itr) + return 0; + + while (mnt_table_next_fs(tb, itr, &fs) == 0) { + if (!mnt_fs_is_kernel(fs)) { + mnt_free_iter(itr); + return 0; + } + } + + mnt_free_iter(itr); + return 1; +} + +/* 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_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; + + 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; + + 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; + } + + if ((flags & FL_REAL) && mnt_fs_is_pseudofs(fs)) + return rc; + + if ((flags & FL_PSEUDO) && !mnt_fs_is_pseudofs(fs)) + return rc; + + return !rc; +} + +/* iterate over filesystems in @tb */ +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) searches 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; +} + +/* + * Filter out unwanted lines for --list output or top level lines for + * --submounts tree output. + */ +static int add_matching_lines(struct libmnt_table *tb, + struct libscols_table *table, int direction) +{ + struct libmnt_iter *itr; + 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 ((flags & FL_TREE) || (flags & FL_SUBMOUNTS)) + rc = create_treenode(table, tb, fs, NULL); + else + rc = !add_line(table, 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 libscols_table *table, int direction) +{ + FILE *f = NULL; + int rc = -1; + struct libmnt_iter *itr = NULL; + struct libmnt_table *tb_new; + 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(_("cannot open %s"), 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(table, new, old, change); + if (rc) + goto done; + if (flags & FL_FIRSTONLY) + break; + } + + if (count) { + rc = scols_table_print_range(table, NULL, NULL); + if (rc == 0) + fputc('\n', scols_table_get_stream(table)); + fflush(stdout); + if (rc) + goto done; + } + + /* swap tables */ + tmp = tb; + tb = tb_new; + tb_new = tmp; + + /* remove already printed lines to reduce memory usage */ + scols_table_remove_lines(table); + mnt_reset_table(tb_new); + + if (count && (flags & FL_FIRSTONLY)) + break; + } + + rc = 0; +done: + mnt_unref_table(tb_new); + mnt_free_tabdiff(diff); + mnt_free_iter(itr); + if (f) + fclose(f); + return rc; +} + +static int uniq_fs_target_cmp( + struct libmnt_table *tb __attribute__((__unused__)), + struct libmnt_fs *a, + struct libmnt_fs *b) +{ + return !mnt_fs_match_target(a, mnt_fs_get_target(b), cache); +} + +static void __attribute__((__noreturn__)) usage(void) +{ + FILE *out = stdout; + size_t 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 <path> | --mountpoint <dir>]\n"), + program_invocation_short_name); + + fputs(USAGE_SEPARATOR, out); + fputs(_("Find a (mounted) filesystem.\n"), out); + + fputs(USAGE_OPTIONS, out); + fputs(_(" -s, --fstab search in static table of filesystems\n"), out); + fputs(_(" -m, --mtab search in table of mounted filesystems\n" + " (includes user space mount options)\n"), out); + fputs(_(" -k, --kernel search in kernel table of mounted\n" + " filesystems (default)\n"), out); + fputc('\n', out); + fputs(_(" -p, --poll[=<list>] monitor changes in table of mounted filesystems\n"), out); + fputs(_(" -w, --timeout <num> upper limit in milliseconds that --poll will block\n"), out); + fputc('\n', out); + + fputs(_(" -A, --all disable all built-in filters, print all filesystems\n"), out); + fputs(_(" -a, --ascii use ASCII chars for tree formatting\n"), out); + fputs(_(" -b, --bytes print sizes in bytes rather than in human readable format\n"), out); + fputs(_(" -C, --nocanonicalize don't canonicalize when comparing paths\n"), out); + fputs(_(" -c, --canonicalize canonicalize printed paths\n"), out); + fputs(_(" -D, --df imitate the output of df(1)\n"), out); + fputs(_(" -d, --direction <word> direction of search, 'forward' or 'backward'\n"), out); + fputs(_(" -e, --evaluate convert tags (LABEL,UUID,PARTUUID,PARTLABEL) \n" + " to device names\n"), out); + fputs(_(" -F, --tab-file <path> alternative file for -s, -m or -k options\n"), out); + fputs(_(" -f, --first-only print the first found filesystem only\n"), out); + fputs(_(" -i, --invert invert the sense of matching\n"), out); + fputs(_(" -J, --json use JSON output format\n"), out); + fputs(_(" -l, --list use list format output\n"), out); + fputs(_(" -N, --task <tid> use alternative namespace (/proc/<tid>/mountinfo file)\n"), out); + fputs(_(" -n, --noheadings don't print column headings\n"), out); + fputs(_(" -O, --options <list> limit the set of filesystems by mount options\n"), out); + fputs(_(" -o, --output <list> the output columns to be shown\n"), out); + fputs(_(" --output-all output all available columns\n"), out); + fputs(_(" -P, --pairs use key=\"value\" output format\n"), out); + fputs(_(" --pseudo print only pseudo-filesystems\n"), out); + fputs(_(" -R, --submounts print all submounts for the matching filesystems\n"), out); + fputs(_(" -r, --raw use raw output format\n"), out); + fputs(_(" --real print only real filesystems\n"), out); + fputs(_(" -S, --source <string> the device to mount (by name, maj:min, \n" + " LABEL=, UUID=, PARTUUID=, PARTLABEL=)\n"), out); + fputs(_(" -T, --target <path> the path to the filesystem to use\n"), out); + fputs(_(" --tree enable tree format output is possible\n"), out); + fputs(_(" -M, --mountpoint <dir> the mountpoint directory\n"), out); + fputs(_(" -t, --types <list> limit the set of filesystems by FS types\n"), out); + fputs(_(" -U, --uniq ignore filesystems with duplicate target\n"), out); + fputs(_(" -u, --notruncate don't truncate text in columns\n"), out); + fputs(_(" -v, --nofsroot don't print [/dir] for bind or btrfs mounts\n"), out); + + fputc('\n', out); + fputs(_(" -x, --verify verify mount table content (default is fstab)\n"), out); + fputs(_(" --verbose print more details\n"), out); + + fputs(USAGE_SEPARATOR, out); + printf(USAGE_HELP_OPTIONS(24)); + + fputs(USAGE_COLUMNS, out); + for (i = 0; i < ARRAY_SIZE(infos); i++) + fprintf(out, " %11s %s\n", infos[i].name, _(infos[i].help)); + + printf(USAGE_MAN_TAIL("findmnt(8)")); + + exit(EXIT_SUCCESS); +} + +int main(int argc, char *argv[]) +{ + struct libmnt_table *tb = NULL; + char **tabfiles = NULL; + int direction = MNT_ITER_FORWARD; + int verify = 0; + int c, rc = -1, timeout = -1; + int ntabfiles = 0, tabtype = 0; + char *outarg = NULL; + size_t i; + int force_tree = 0, istree = 0; + + struct libscols_table *table = NULL; + + enum { + FINDMNT_OPT_VERBOSE = CHAR_MAX + 1, + FINDMNT_OPT_TREE, + FINDMNT_OPT_OUTPUT_ALL, + FINDMNT_OPT_PSEUDO, + FINDMNT_OPT_REAL + }; + + static const struct option longopts[] = { + { "all", no_argument, NULL, 'A' }, + { "ascii", no_argument, NULL, 'a' }, + { "bytes", no_argument, NULL, 'b' }, + { "canonicalize", no_argument, NULL, 'c' }, + { "direction", required_argument, NULL, 'd' }, + { "df", no_argument, NULL, 'D' }, + { "evaluate", no_argument, NULL, 'e' }, + { "first-only", no_argument, NULL, 'f' }, + { "fstab", no_argument, NULL, 's' }, + { "help", no_argument, NULL, 'h' }, + { "invert", no_argument, NULL, 'i' }, + { "json", no_argument, NULL, 'J' }, + { "kernel", no_argument, NULL, 'k' }, + { "list", no_argument, NULL, 'l' }, + { "mountpoint", required_argument, NULL, 'M' }, + { "mtab", no_argument, NULL, 'm' }, + { "noheadings", no_argument, NULL, 'n' }, + { "notruncate", no_argument, NULL, 'u' }, + { "options", required_argument, NULL, 'O' }, + { "output", required_argument, NULL, 'o' }, + { "output-all", no_argument, NULL, FINDMNT_OPT_OUTPUT_ALL }, + { "poll", optional_argument, NULL, 'p' }, + { "pairs", no_argument, NULL, 'P' }, + { "raw", no_argument, NULL, 'r' }, + { "types", required_argument, NULL, 't' }, + { "nocanonicalize", no_argument, NULL, 'C' }, + { "nofsroot", no_argument, NULL, 'v' }, + { "submounts", no_argument, NULL, 'R' }, + { "source", required_argument, NULL, 'S' }, + { "tab-file", required_argument, NULL, 'F' }, + { "task", required_argument, NULL, 'N' }, + { "target", required_argument, NULL, 'T' }, + { "timeout", required_argument, NULL, 'w' }, + { "uniq", no_argument, NULL, 'U' }, + { "verify", no_argument, NULL, 'x' }, + { "version", no_argument, NULL, 'V' }, + { "verbose", no_argument, NULL, FINDMNT_OPT_VERBOSE }, + { "tree", no_argument, NULL, FINDMNT_OPT_TREE }, + { "real", no_argument, NULL, FINDMNT_OPT_REAL }, + { "pseudo", no_argument, NULL, FINDMNT_OPT_PSEUDO }, + { NULL, 0, NULL, 0 } + }; + + static const ul_excl_t excl[] = { /* rows and cols in ASCII order */ + { 'C', 'c'}, /* [no]canonicalize */ + { 'C', 'e' }, /* nocanonicalize, evaluate */ + { 'J', 'P', 'r','x' }, /* json,pairs,raw,verify */ + { 'M', 'T' }, /* mountpoint, target */ + { 'N','k','m','s' }, /* task,kernel,mtab,fstab */ + { 'P','l','r','x' }, /* pairs,list,raw,verify */ + { 'p','x' }, /* poll,verify */ + { 'm','p','s' }, /* mtab,poll,fstab */ + { FINDMNT_OPT_PSEUDO, FINDMNT_OPT_REAL }, + { 0 } + }; + int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT; + + setlocale(LC_ALL, ""); + bindtextdomain(PACKAGE, LOCALEDIR); + textdomain(PACKAGE); + atexit(close_stdout); + + /* default output format */ + flags |= FL_TREE; + + while ((c = getopt_long(argc, argv, + "AabCcDd:ehiJfF:o:O:p::PklmM:nN:rst:uvRS:T:Uw:Vx", + longopts, NULL)) != -1) { + + err_exclusive_options(c, longopts, excl, excl_st); + + switch(c) { + case 'A': + flags |= FL_ALL; + break; + case 'a': + flags |= FL_ASCII; + break; + case 'b': + flags |= FL_BYTES; + break; + case 'C': + flags |= FL_NOCACHE; + break; + case 'c': + flags |= FL_CANONICALIZE; + break; + case 'D': + flags &= ~FL_TREE; + flags |= FL_DF; + 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(); + break; + case 'i': + flags |= FL_INVERT; + break; + case 'J': + flags |= FL_JSON; + break; + case 'f': + flags |= FL_FIRSTONLY; + break; + case 'F': + tabfiles = append_tabfile(tabfiles, &ntabfiles, optarg); + break; + case 'u': + disable_columns_truncate(); + break; + case 'o': + outarg = optarg; + break; + case FINDMNT_OPT_OUTPUT_ALL: + for (ncolumns = 0; ncolumns < ARRAY_SIZE(infos); ncolumns++) { + if (is_tabdiff_column(ncolumns)) + continue; + columns[ncolumns] = ncolumns; + } + break; + case 'O': + set_match(COL_OPTIONS, optarg); + break; + case 'p': + if (optarg) { + nactions = string_to_idarray(optarg, + actions, ARRAY_SIZE(actions), + poll_action_name_to_id); + if (nactions < 0) + exit(EXIT_FAILURE); + } + flags |= FL_POLL; + flags &= ~FL_TREE; + break; + case 'P': + flags |= FL_EXPORT; + flags &= ~FL_TREE; + break; + case 'm': /* mtab */ + tabtype = TABTYPE_MTAB; + flags &= ~FL_TREE; + break; + case 's': /* fstab */ + tabtype = TABTYPE_FSTAB; + flags &= ~FL_TREE; + break; + case 'k': /* kernel (mountinfo) */ + tabtype = TABTYPE_KERNEL; + break; + case 't': + set_match(COL_FSTYPE, optarg); + break; + case 'r': + flags &= ~FL_TREE; /* disable the default */ + flags |= FL_RAW; /* enable raw */ + break; + case 'l': + flags &= ~FL_TREE; /* disable the default */ + break; + case 'n': + flags |= FL_NOHEADINGS; + break; + case 'N': + tabtype = TABTYPE_KERNEL; + tabfiles = append_pid_tabfile(tabfiles, &ntabfiles, + strtou32_or_err(optarg, + _("invalid TID argument"))); + break; + case 'v': + flags |= FL_NOFSROOT; + break; + case 'R': + flags |= FL_SUBMOUNTS; + break; + case 'S': + set_source_match(optarg); + flags |= FL_NOSWAPMATCH; + break; + case 'M': + flags |= FL_STRICTTARGET; + /* fallthrough */ + case 'T': + set_match(COL_TARGET, optarg); + flags |= FL_NOSWAPMATCH; + break; + case 'U': + flags |= FL_UNIQ; + break; + case 'w': + timeout = strtos32_or_err(optarg, _("invalid timeout argument")); + break; + case 'V': + printf(UTIL_LINUX_VERSION); + return EXIT_SUCCESS; + case 'x': + verify = 1; + break; + case FINDMNT_OPT_VERBOSE: + flags |= FL_VERBOSE; + break; + case FINDMNT_OPT_TREE: + force_tree = 1; + break; + case FINDMNT_OPT_PSEUDO: + flags |= FL_PSEUDO; + break; + case FINDMNT_OPT_REAL: + flags |= FL_REAL; + break; + default: + errtryhelp(EXIT_FAILURE); + } + } + + if (!ncolumns && (flags & FL_DF)) { + add_column(columns, ncolumns++, COL_SOURCE); + add_column(columns, ncolumns++, COL_FSTYPE); + add_column(columns, ncolumns++, COL_SIZE); + add_column(columns, ncolumns++, COL_USED); + add_column(columns, ncolumns++, COL_AVAIL); + add_column(columns, ncolumns++, COL_USEPERC); + add_column(columns, ncolumns++, COL_TARGET); + } + + /* default columns */ + if (!ncolumns) { + if (flags & FL_POLL) + add_column(columns, ncolumns++, COL_ACTION); + + add_column(columns, ncolumns++, COL_TARGET); + add_column(columns, ncolumns++, COL_SOURCE); + add_column(columns, ncolumns++, COL_FSTYPE); + add_column(columns, ncolumns++, COL_OPTIONS); + } + + if (outarg && string_add_to_idarray(outarg, columns, ARRAY_SIZE(columns), + &ncolumns, column_name_to_id) < 0) + return EXIT_FAILURE; + + if (!tabtype) + tabtype = verify ? TABTYPE_FSTAB : TABTYPE_KERNEL; + + if ((flags & FL_POLL) && ntabfiles > 1) + errx(EXIT_FAILURE, _("--poll accepts only one file, but more specified by --tab-file")); + + 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_source_match(argv[optind++]); /* dev/tag/mountpoint/maj:min */ + if (optind < argc) + set_match(COL_TARGET, argv[optind++]); /* mountpoint */ + + if ((flags & FL_SUBMOUNTS) && is_listall_mode()) + /* don't care about submounts if list all mounts */ + flags &= ~FL_SUBMOUNTS; + + if (!(flags & FL_SUBMOUNTS) && ((flags & FL_FIRSTONLY) + || get_match(COL_TARGET) + || get_match(COL_SOURCE) + || get_match(COL_MAJMIN))) + flags &= ~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) || + !strncmp(x, "PARTLABEL=", 10) || !strncmp(x, "PARTUUID=", 9)) + flags |= FL_NOSWAPMATCH; + } + + /* + * initialize libmount + */ + mnt_init_debug(0); + + tb = parse_tabfiles(tabfiles, ntabfiles, tabtype); + if (!tb) + goto leave; + + if (tabtype == TABTYPE_MTAB && tab_is_kernel(tb)) + tabtype = TABTYPE_KERNEL; + + istree = tab_is_tree(tb); + if (istree && force_tree) + flags |= FL_TREE; + + if ((flags & FL_TREE) && (ntabfiles > 1 || !istree)) + flags &= ~FL_TREE; + + if (!(flags & FL_NOCACHE)) { + cache = mnt_new_cache(); + if (!cache) { + warn(_("failed to initialize libmount cache")); + goto leave; + } + mnt_table_set_cache(tb, cache); + + if (tabtype != TABTYPE_KERNEL) + cache_set_targets(cache); + } + + if (flags & FL_UNIQ) + mnt_table_uniq_fs(tb, MNT_UNIQ_KEEPTREE, uniq_fs_target_cmp); + + if (verify) { + rc = verify_table(tb); + goto leave; + } + + /* + * initialize libsmartcols + */ + scols_init_debug(0); + table = scols_new_table(); + if (!table) { + warn(_("failed to allocate output table")); + goto leave; + } + scols_table_enable_raw(table, !!(flags & FL_RAW)); + scols_table_enable_export(table, !!(flags & FL_EXPORT)); + scols_table_enable_json(table, !!(flags & FL_JSON)); + scols_table_enable_ascii(table, !!(flags & FL_ASCII)); + scols_table_enable_noheadings(table, !!(flags & FL_NOHEADINGS)); + + if (flags & FL_JSON) + scols_table_set_name(table, "filesystems"); + + for (i = 0; i < ncolumns; i++) { + struct libscols_column *cl; + int fl = get_column_flags(i); + int id = get_column_id(i); + + if (!(flags & FL_TREE)) + fl &= ~SCOLS_FL_TREE; + + if (!(flags & FL_POLL) && is_tabdiff_column(id)) { + warnx(_("%s column is requested, but --poll " + "is not enabled"), get_column_name(i)); + goto leave; + } + cl = scols_table_new_column(table, get_column_name(i), + get_column_whint(i), fl); + if (!cl) { + warn(_("failed to allocate output column")); + goto leave; + } + + if (flags & FL_JSON) { + switch (id) { + case COL_SIZE: + case COL_AVAIL: + case COL_USED: + if (!(flags & FL_BYTES)) + break; + /* fallthrough */ + case COL_ID: + case COL_FREQ: + case COL_PASSNO: + case COL_TID: + scols_column_set_json_type(cl, SCOLS_JSON_NUMBER); + break; + default: + scols_column_set_json_type(cl, SCOLS_JSON_STRING); + break; + } + } + } + + /* + * Fill in data to the output table + */ + if (flags & FL_POLL) { + /* poll mode (accept the first tabfile only) */ + rc = poll_table(tb, tabfiles ? *tabfiles : _PATH_PROC_MOUNTINFO, timeout, table, direction); + + } else if ((flags & FL_TREE) && !(flags & FL_SUBMOUNTS)) { + /* whole tree */ + rc = create_treenode(table, tb, NULL, NULL); + } else { + /* whole list of sub-tree */ + rc = add_matching_lines(tb, table, direction); + + if (rc != 0 + && tabtype == TABTYPE_KERNEL + && (flags & FL_NOSWAPMATCH) + && !(flags & FL_STRICTTARGET) + && get_match(COL_TARGET)) { + /* + * Found nothing, maybe the --target is regular file, + * try it again with extra functionality for target + * match + */ + enable_extra_target_match(tb); + rc = add_matching_lines(tb, table, direction); + } + } + + /* + * Print the output table for non-poll modes + */ + if (!rc && !(flags & FL_POLL)) + scols_print_table(table); +leave: + scols_unref_table(table); + + mnt_unref_table(tb); + mnt_unref_cache(cache); + + free(tabfiles); +#ifdef HAVE_LIBUDEV + udev_unref(udev); +#endif + return rc ? EXIT_FAILURE : EXIT_SUCCESS; +} |