From 783d57af7bb2b851c16cf87df848e0365e5052da Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Wed, 12 Apr 2017 13:58:40 +0200 Subject: Sort some miscutils/ applets into coreutils or util-linux No code changes Signed-off-by: Denys Vlasenko --- util-linux/mountpoint.c | 105 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 105 insertions(+) create mode 100644 util-linux/mountpoint.c (limited to 'util-linux/mountpoint.c') diff --git a/util-linux/mountpoint.c b/util-linux/mountpoint.c new file mode 100644 index 000000000..8b9e1d779 --- /dev/null +++ b/util-linux/mountpoint.c @@ -0,0 +1,105 @@ +/* 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" +//config: default y +//config: help +//config: mountpoint checks if the directory is a mountpoint. + +//applet:IF_MOUNTPOINT(APPLET(mountpoint, BB_DIR_BIN, BB_SUID_DROP)) + +//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) +{ + struct stat st; + const char *msg; + char *arg; + int rc, opt; + + opt_complementary = "=1"; /* must have one argument */ + opt = getopt32(argv, "qdxn"); +#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); + + 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); + + 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: + if (!(opt & OPT_q)) + bb_perror_msg(msg, arg); + return EXIT_FAILURE; +} -- cgit v1.2.3