busybox/util-linux/mountpoint.c

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/* vi: set sw=4 ts=4: */
/*
* mountpoint implementation for busybox
*
* Copyright (C) 2005 Bernhard Reutner-Fischer
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*
* Based on sysvinit's mountpoint
*/
//config:config MOUNTPOINT
//config: bool "mountpoint (4.5 kb)"
//config: default y
//config: help
//config: mountpoint checks if the directory is a mountpoint.
//applet:IF_MOUNTPOINT(APPLET_NOEXEC(mountpoint, mountpoint, BB_DIR_BIN, BB_SUID_DROP, mountpoint))
//kbuild:lib-$(CONFIG_MOUNTPOINT) += mountpoint.o
//usage:#define mountpoint_trivial_usage
//usage: "[-q] <[-dn] DIR | -x DEVICE>"
//usage:#define mountpoint_full_usage "\n\n"
//usage: "Check if the directory is a mountpoint\n"
//usage: "\n -q Quiet"
//usage: "\n -d Print major/minor device number of the filesystem"
//usage: "\n -n Print device name of the filesystem"
//usage: "\n -x Print major/minor device number of the blockdevice"
//usage:
//usage:#define mountpoint_example_usage
//usage: "$ mountpoint /proc\n"
//usage: "/proc is not a mountpoint\n"
//usage: "$ mountpoint /sys\n"
//usage: "/sys is a mountpoint\n"
#include "libbb.h"
int mountpoint_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int mountpoint_main(int argc UNUSED_PARAM, char **argv)
{
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struct stat st;
const char *msg;
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char *arg;
int rc, opt;
getopt32: remove opt_complementary function old new delta vgetopt32 1318 1392 +74 runsvdir_main 703 713 +10 bb_make_directory 423 425 +2 collect_cpu 546 545 -1 opt_chars 3 - -3 opt_complementary 4 - -4 tftpd_main 567 562 -5 ntp_init 476 471 -5 zcip_main 1266 1256 -10 xxd_main 428 418 -10 whois_main 140 130 -10 who_main 463 453 -10 which_main 212 202 -10 wget_main 2535 2525 -10 watchdog_main 291 281 -10 watch_main 222 212 -10 vlock_main 399 389 -10 uuencode_main 332 322 -10 uudecode_main 316 306 -10 unlink_main 45 35 -10 udhcpd_main 1482 1472 -10 udhcpc_main 2762 2752 -10 tune2fs_main 290 280 -10 tunctl_main 366 356 -10 truncate_main 218 208 -10 tr_main 518 508 -10 time_main 1134 1124 -10 tftp_main 286 276 -10 telnetd_main 1873 1863 -10 tcpudpsvd_main 1785 1775 -10 taskset_main 521 511 -10 tar_main 1009 999 -10 tail_main 1644 1634 -10 syslogd_main 1967 1957 -10 switch_root_main 368 358 -10 svlogd_main 1454 1444 -10 sv 1296 1286 -10 stat_main 104 94 -10 start_stop_daemon_main 1028 1018 -10 split_main 542 532 -10 sort_main 796 786 -10 slattach_main 624 614 -10 shuf_main 504 494 -10 setsid_main 96 86 -10 setserial_main 1132 1122 -10 setfont_main 388 378 -10 setconsole_main 78 68 -10 sendmail_main 1209 1199 -10 sed_main 677 667 -10 script_main 1077 1067 -10 run_parts_main 325 315 -10 rtcwake_main 454 444 -10 rm_main 175 165 -10 reformime_main 119 109 -10 readlink_main 123 113 -10 rdate_main 246 236 -10 pwdx_main 189 179 -10 pstree_main 317 307 -10 pscan_main 663 653 -10 popmaildir_main 818 808 -10 pmap_main 80 70 -10 nc_main 1042 1032 -10 mv_main 558 548 -10 mountpoint_main 477 467 -10 mount_main 1264 1254 -10 modprobe_main 768 758 -10 modinfo_main 333 323 -10 mktemp_main 200 190 -10 mkswap_main 324 314 -10 mkfs_vfat_main 1489 1479 -10 microcom_main 715 705 -10 md5_sha1_sum_main 521 511 -10 man_main 867 857 -10 makedevs_main 1052 1042 -10 ls_main 563 553 -10 losetup_main 432 422 -10 loadfont_main 89 79 -10 ln_main 524 514 -10 link_main 75 65 -10 ipcalc_main 544 534 -10 iostat_main 2397 2387 -10 install_main 768 758 -10 id_main 480 470 -10 i2cset_main 1239 1229 -10 i2cget_main 380 370 -10 i2cdump_main 1482 1472 -10 i2cdetect_main 682 672 -10 hwclock_main 406 396 -10 httpd_main 741 731 -10 grep_main 837 827 -10 getty_main 1559 1549 -10 fuser_main 297 287 -10 ftpgetput_main 345 335 -10 ftpd_main 2232 2222 -10 fstrim_main 251 241 -10 fsfreeze_main 77 67 -10 fsck_minix_main 2921 2911 -10 flock_main 314 304 -10 flashcp_main 740 730 -10 flash_eraseall_main 833 823 -10 fdformat_main 532 522 -10 expand_main 680 670 -10 eject_main 335 325 -10 dumpleases_main 630 620 -10 du_main 314 304 -10 dos2unix_main 441 431 -10 diff_main 1350 1340 -10 df_main 1064 1054 -10 date_main 1095 1085 -10 cut_main 961 951 -10 cryptpw_main 228 218 -10 crontab_main 575 565 -10 crond_main 1149 1139 -10 cp_main 370 360 -10 common_traceroute_main 3834 3824 -10 common_ping_main 1767 1757 -10 comm_main 239 229 -10 cmp_main 655 645 -10 chrt_main 379 369 -10 chpst_main 704 694 -10 chpasswd_main 308 298 -10 chown_main 171 161 -10 chmod_main 158 148 -10 cat_main 428 418 -10 bzip2_main 120 110 -10 blkdiscard_main 264 254 -10 base64_main 221 211 -10 arping_main 1665 1655 -10 ar_main 556 546 -10 adjtimex_main 406 396 -10 adduser_main 882 872 -10 addgroup_main 411 401 -10 acpid_main 1198 1188 -10 optstring 11 - -11 opt_string 18 - -18 OPT_STR 25 - -25 ubi_tools_main 1288 1258 -30 ls_options 31 - -31 ------------------------------------------------------------------------------ (add/remove: 0/6 grow/shrink: 3/129 up/down: 86/-1383) Total: -1297 bytes text data bss dec hex filename 915428 485 6876 922789 e14a5 busybox_old 914629 485 6872 921986 e1182 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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opt = getopt32(argv, "^" "qdxn" "\0" "=1");
#define OPT_q (1)
#define OPT_d (2)
#define OPT_x (4)
#define OPT_n (8)
arg = argv[optind];
msg = "%s";
rc = (opt & OPT_x) ? stat(arg, &st) : lstat(arg, &st);
if (rc != 0)
goto err;
if (opt & OPT_x) {
if (S_ISBLK(st.st_mode)) {
printf("%u:%u\n", major(st.st_rdev),
minor(st.st_rdev));
return EXIT_SUCCESS;
}
errno = 0; /* make perror_msg work as error_msg */
msg = "%s: not a block device";
goto err;
}
errno = ENOTDIR;
if (S_ISDIR(st.st_mode)) {
dev_t st_dev = st.st_dev;
ino_t st_ino = st.st_ino;
char *p = xasprintf("%s/..", arg);
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if (stat(p, &st) == 0) {
//int is_mnt = (st_dev != st.st_dev) || (st_dev == st.st_dev && st_ino == st.st_ino);
int is_not_mnt = (st_dev == st.st_dev) && (st_ino != st.st_ino);
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if (opt & OPT_d)
printf("%u:%u\n", major(st_dev), minor(st_dev));
if (opt & OPT_n) {
const char *d = find_block_device(arg);
/* name is undefined, but device is mounted -> anonymous superblock! */
/* happens with btrfs */
if (!d) {
d = "UNKNOWN";
/* TODO: iterate /proc/mounts, or /proc/self/mountinfo
* to find out the device name */
}
printf("%s %s\n", d, arg);
}
if (!(opt & (OPT_q | OPT_d | OPT_n)))
printf("%s is %sa mountpoint\n", arg, is_not_mnt ? "not " : "");
return is_not_mnt;
}
arg = p;
/* else: stat had set errno, just fall through */
}
err:
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if (!(opt & OPT_q))
bb_perror_msg(msg, arg);
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return EXIT_FAILURE;
}