/* * findmnt(8) * * Copyright (C) 2010-2015 Red Hat, Inc. All rights reserved. * Written by Karel Zak * * 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 #include #include #include #include #include #include #ifdef HAVE_SYS_IOCTL_H # include #endif #include #include #include #include #ifdef HAVE_LIBUDEV # include #endif #include #include #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= */ #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 . 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_REAL || flags & FL_PSEUDO) && !(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= */ 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 * * ... it works like "mount " */ static int is_mount_compatible_mode(void) { if (!get_match(COL_SOURCE)) return 0; /* 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, "/") != 0) xasprintf(&str, "%s[%s]", spec, root); else if (spec) str = xstrdup(spec); if (!cache) free(cn); break; } case COL_TARGET: if (mnt_fs_get_target(fs)) str = xstrdup(mnt_fs_get_target(fs)); break; case COL_FSTYPE: if (mnt_fs_get_fstype(fs)) str = xstrdup(mnt_fs_get_fstype(fs)); break; case COL_OPTIONS: if (mnt_fs_get_options(fs)) str = xstrdup(mnt_fs_get_options(fs)); break; case COL_VFS_OPTIONS: if (mnt_fs_get_vfs_options(fs)) str = xstrdup(mnt_fs_get_vfs_options(fs)); break; case COL_FS_OPTIONS: if (mnt_fs_get_fs_options(fs)) str = xstrdup(mnt_fs_get_fs_options(fs)); break; case COL_OPT_FIELDS: if (mnt_fs_get_optional_fields(fs)) 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: if (mnt_fs_get_root(fs)) 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) && mnt_fs_get_options(old_fs)) str = xstrdup(mnt_fs_get_options(old_fs)); break; case COL_OLD_TARGET: if (old_fs && (change == MNT_TABDIFF_MOVE || change == MNT_TABDIFF_UMOUNT) && mnt_fs_get_target(old_fs)) 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 */ 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] [-O ] [-t ] * findmnt [-l] [-O ] [-t ] */ again: if (mnt_table_find_next_fs(tb, itr, match_func, NULL, &fs) != 0) fs = NULL; 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] | \n" " %1$s [options] \n" " %1$s [options] [--source ] [--target | --mountpoint ]\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[=] monitor changes in table of mounted filesystems\n"), out); fputs(_(" -w, --timeout 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 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 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 use alternative namespace (/proc//mountinfo file)\n"), out); fputs(_(" -n, --noheadings don't print column headings\n"), out); fputs(_(" -O, --options limit the set of filesystems by mount options\n"), out); fputs(_(" -o, --output 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 the device to mount (by name, maj:min, \n" " LABEL=, UUID=, PARTUUID=, PARTLABEL=)\n"), out); fputs(_(" -T, --target the path to the filesystem to use\n"), out); fputs(_(" --tree enable tree format output is possible\n"), out); fputs(_(" -M, --mountpoint the mountpoint directory\n"), out); fputs(_(" -t, --types 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); close_stdout_atexit(); /* 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 '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 '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; case 'h': usage(); case 'V': print_version(EXIT_SUCCESS); 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; }