Bernhard Fischer provided a mountpoint(1) applet. This is apparently something

sysvinit provides, and which is used by the debian init scripts.

diff --git a/include/applets.h b/include/applets.h
index e2fe251..a4e78af 100644 (file)
--- a/include/applets.h
+++ b/include/applets.h
@@ -435,6 +435,9 @@
 #ifdef CONFIG_MOUNT
        APPLET(mount, mount_main, _BB_DIR_BIN, _BB_SUID_NEVER)
 #endif
+#ifdef CONFIG_MOUNTPOINT
+       APPLET(mountpoint, mountpoint_main, _BB_DIR_BIN, _BB_SUID_NEVER)
+#endif
 #ifdef CONFIG_MSH
        APPLET_NOUSAGE("msh", msh_main, _BB_DIR_BIN, _BB_SUID_NEVER)
 #endif

diff --git a/include/usage.h b/include/usage.h
index dc8058a..6622278 100644 (file)
--- a/include/usage.h
+++ b/include/usage.h
@@ -1922,6 +1922,20 @@
        "$ mount /dev/fd0 /mnt -t msdos -o ro\n" \
        "$ mount /tmp/diskimage /opt -t ext2 -o loop\n"
 
+#define mountpoint_trivial_usage \
+       "[-q] <[-d] DIR | -x DEVICE>"
+#define mountpoint_full_usage \
+       "mountpoint checks if the directory is a mountpoint\n\n" \
+       "Options:\n"  \
+       "\t-q:\t\tBe more quiet\n" \
+       "\t-d:\t\tPrint major/minor device number of the filesystem\n" \
+       "\t-x:\t\tPrint major/minor device number of the blockdevice"
+#define mountpoint_example_usage \
+       "$ mountpoint /proc\n" \
+       "/proc is not a mountpoint\n" \
+       "$ mountpoint /sys\n" \
+       "/sys is a mountpoint\n"
+
 #define mt_trivial_usage \
        "[-f device] opcode value"
 #define mt_full_usage \

diff --git a/miscutils/Config.in b/miscutils/Config.in
index 6c68cd0..1f14d21 100644 (file)
--- a/miscutils/Config.in
+++ b/miscutils/Config.in
@@ -194,6 +194,12 @@ config CONFIG_FEATURE_MAKEDEVS_TABLE
 
 endchoice
 
+config CONFIG_MOUNTPOINT
+       bool "mountpoint"
+       default n
+       help
+         mountpoint checks if the directory is a mountpoint.
+
 config CONFIG_MT
        bool "mt"
        default n

diff --git a/miscutils/Makefile.in b/miscutils/Makefile.in
index 8c53104..ee1cc75 100644 (file)
--- a/miscutils/Makefile.in
+++ b/miscutils/Makefile.in
@@ -34,6 +34,7 @@ MISCUTILS-$(CONFIG_EJECT)       += eject.o
 MISCUTILS-$(CONFIG_HDPARM)      += hdparm.o
 MISCUTILS-$(CONFIG_LAST)        += last.o
 MISCUTILS-$(CONFIG_MAKEDEVS)    += makedevs.o
+MISCUTILS-$(CONFIG_MOUNTPOINT) += mountpoint.o
 MISCUTILS-$(CONFIG_MT)          += mt.o
 MISCUTILS-$(CONFIG_RX)          += rx.o
 MISCUTILS-$(CONFIG_SETSID)      += setsid.o

diff --git a/miscutils/mountpoint.c b/miscutils/mountpoint.c
new file mode 100644 (file)
index 0000000..46b2d4e
--- /dev/null
+++ b/miscutils/mountpoint.c
@@ -0,0 +1,70 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * mountpoint implementation for busybox
+ *
+ * Copyright (C) 2005 Bernhard Fischer
+ *
+ * Licensed under the GPL v2, see the file LICENSE in this tarball.
+ *
+ * Based on sysvinit's mountpoint
+ */
+
+#include <sys/stat.h>
+#include <errno.h> /* errno */
+#include <string.h> /* strerror */
+#include <getopt.h> /* optind */
+#include "busybox.h"
+
+int mountpoint_main(int argc, char **argv)
+{
+       int opt = bb_getopt_ulflags(argc, argv, "qdx");
+#define OPT_q (1)
+#define OPT_d (2)
+#define OPT_x (4)
+
+       if (optind != argc - 1)
+               bb_show_usage();
+       {
+               char *arg = argv[optind];
+               struct stat st;
+
+               if ( (opt & OPT_x && stat(arg, &st) == 0) || (lstat(arg, &st) == 0) ) {
+                       if (opt & OPT_x) {
+                               if (S_ISBLK(st.st_mode))
+                               {
+                                       bb_printf("%u:%u\n", major(st.st_rdev),
+                                                               minor(st.st_rdev));
+                                       return EXIT_SUCCESS;
+                               } else {
+                                       if (opt & OPT_q)
+                                               putchar('\n');
+                                       else
+                                               bb_error_msg("%s: not a block device", arg);
+                               }
+                               return EXIT_FAILURE;
+                       } else
+                       if (S_ISDIR(st.st_mode)) {
+                               dev_t st_dev = st.st_dev;
+                               ino_t st_ino = st.st_ino;
+                               char *p;
+                               bb_xasprintf(&p, "%s/..", arg);
+                               if (stat(p, &st) == 0) {
+                                       short ret = (st_dev != st.st_dev) ||
+                                               (st_dev == st.st_dev && st_ino == st.st_ino);
+                                       if (opt & OPT_d)
+                                               bb_printf("%u:%u\n", major(st_dev), minor(st_dev));
+                                       else if (!(opt & OPT_q))
+                                               bb_printf("%s is %sa mountpoint\n", arg, ret?"":"not ");
+                                       return !ret;
+                               }
+                       } else {
+                               if (!(opt & OPT_q))
+                                       bb_error_msg("%s: not a directory", arg);
+                               return EXIT_FAILURE;
+                       }
+               }
+               if (!(opt & OPT_q))
+                       bb_perror_msg(arg);
+               return EXIT_FAILURE;
+       }
+}