Bernhard Fischer provided a mountpoint(1) applet. This is apparently something
sysvinit provides, and which is used by the debian init scripts.
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parent
fc3f048f8f
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@ -435,6 +435,9 @@
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#ifdef CONFIG_MOUNT
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APPLET(mount, mount_main, _BB_DIR_BIN, _BB_SUID_NEVER)
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#endif
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#ifdef CONFIG_MOUNTPOINT
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APPLET(mountpoint, mountpoint_main, _BB_DIR_BIN, _BB_SUID_NEVER)
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#endif
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#ifdef CONFIG_MSH
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APPLET_NOUSAGE("msh", msh_main, _BB_DIR_BIN, _BB_SUID_NEVER)
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#endif
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@ -1922,6 +1922,20 @@
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"$ mount /dev/fd0 /mnt -t msdos -o ro\n" \
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"$ mount /tmp/diskimage /opt -t ext2 -o loop\n"
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#define mountpoint_trivial_usage \
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"[-q] <[-d] DIR | -x DEVICE>"
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#define mountpoint_full_usage \
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"mountpoint checks if the directory is a mountpoint\n\n" \
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"Options:\n" \
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"\t-q:\t\tBe more quiet\n" \
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"\t-d:\t\tPrint major/minor device number of the filesystem\n" \
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"\t-x:\t\tPrint major/minor device number of the blockdevice"
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#define mountpoint_example_usage \
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"$ mountpoint /proc\n" \
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"/proc is not a mountpoint\n" \
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"$ mountpoint /sys\n" \
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"/sys is a mountpoint\n"
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#define mt_trivial_usage \
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"[-f device] opcode value"
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#define mt_full_usage \
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@ -194,6 +194,12 @@ config CONFIG_FEATURE_MAKEDEVS_TABLE
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endchoice
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config CONFIG_MOUNTPOINT
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bool "mountpoint"
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default n
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help
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mountpoint checks if the directory is a mountpoint.
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config CONFIG_MT
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bool "mt"
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default n
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@ -34,6 +34,7 @@ MISCUTILS-$(CONFIG_EJECT) += eject.o
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MISCUTILS-$(CONFIG_HDPARM) += hdparm.o
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MISCUTILS-$(CONFIG_LAST) += last.o
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MISCUTILS-$(CONFIG_MAKEDEVS) += makedevs.o
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MISCUTILS-$(CONFIG_MOUNTPOINT) += mountpoint.o
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MISCUTILS-$(CONFIG_MT) += mt.o
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MISCUTILS-$(CONFIG_RX) += rx.o
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MISCUTILS-$(CONFIG_SETSID) += setsid.o
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70
miscutils/mountpoint.c
Normal file
70
miscutils/mountpoint.c
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@ -0,0 +1,70 @@
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/* vi: set sw=4 ts=4: */
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/*
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* mountpoint implementation for busybox
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*
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* Copyright (C) 2005 Bernhard Fischer
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*
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* Licensed under the GPL v2, see the file LICENSE in this tarball.
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*
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* Based on sysvinit's mountpoint
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*/
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#include <sys/stat.h>
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#include <errno.h> /* errno */
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#include <string.h> /* strerror */
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#include <getopt.h> /* optind */
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#include "busybox.h"
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int mountpoint_main(int argc, char **argv)
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{
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int opt = bb_getopt_ulflags(argc, argv, "qdx");
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#define OPT_q (1)
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#define OPT_d (2)
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#define OPT_x (4)
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if (optind != argc - 1)
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bb_show_usage();
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{
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char *arg = argv[optind];
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struct stat st;
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if ( (opt & OPT_x && stat(arg, &st) == 0) || (lstat(arg, &st) == 0) ) {
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if (opt & OPT_x) {
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if (S_ISBLK(st.st_mode))
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{
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bb_printf("%u:%u\n", major(st.st_rdev),
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minor(st.st_rdev));
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return EXIT_SUCCESS;
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} else {
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if (opt & OPT_q)
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putchar('\n');
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else
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bb_error_msg("%s: not a block device", arg);
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}
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return EXIT_FAILURE;
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} else
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if (S_ISDIR(st.st_mode)) {
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dev_t st_dev = st.st_dev;
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ino_t st_ino = st.st_ino;
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char *p;
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bb_xasprintf(&p, "%s/..", arg);
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if (stat(p, &st) == 0) {
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short ret = (st_dev != st.st_dev) ||
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(st_dev == st.st_dev && st_ino == st.st_ino);
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if (opt & OPT_d)
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bb_printf("%u:%u\n", major(st_dev), minor(st_dev));
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else if (!(opt & OPT_q))
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bb_printf("%s is %sa mountpoint\n", arg, ret?"":"not ");
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return !ret;
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}
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} else {
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if (!(opt & OPT_q))
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bb_error_msg("%s: not a directory", arg);
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return EXIT_FAILURE;
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}
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}
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if (!(opt & OPT_q))
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bb_perror_msg(arg);
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return EXIT_FAILURE;
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}
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}
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