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-rw-r--r--toys/other/mountpoint.c39
1 files changed, 23 insertions, 16 deletions
diff --git a/toys/other/mountpoint.c b/toys/other/mountpoint.c
index 29b8ae67..266bea95 100644
--- a/toys/other/mountpoint.c
+++ b/toys/other/mountpoint.c
@@ -2,7 +2,7 @@
*
* Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
-USE_MOUNTPOINT(NEWTOY(mountpoint, "<1qdx", TOYFLAG_BIN))
+USE_MOUNTPOINT(NEWTOY(mountpoint, "<1qdx[-dx]", TOYFLAG_BIN))
config MOUNTPOINT
bool "mountpoint"
@@ -22,33 +22,40 @@ config MOUNTPOINT
void mountpoint_main(void)
{
struct stat st1, st2;
- int res = 0;
+ char *arg = *toys.optargs;
int quiet = toys.optflags & FLAG_q;
- toys.exitval = 1; // be pessimistic
- strncpy(toybuf, toys.optargs[0], sizeof(toybuf));
- if (((toys.optflags & FLAG_x) && lstat(toybuf, &st1)) || stat(toybuf, &st1))
- perror_exit("%s", toybuf);
- if (toys.optflags & FLAG_x){
+ toys.exitval = 1;
+ if (((toys.optflags & FLAG_x) ? lstat : stat)(arg, &st1))
+ perror_exit("%s", arg);
+
+ if (toys.optflags & FLAG_x) {
if (S_ISBLK(st1.st_mode)) {
if (!quiet) printf("%u:%u\n", major(st1.st_rdev), minor(st1.st_rdev));
toys.exitval = 0;
return;
}
- if (!quiet) printf("%s: not a block device\n", toybuf);
+ if (!quiet) printf("%s: not a block device\n", arg);
return;
}
- if(!S_ISDIR(st1.st_mode)){
- if (!quiet) printf("%s: not a directory\n", toybuf);
+ // Ignore the fact a file can be a mountpoint for --bind mounts.
+ if (!S_ISDIR(st1.st_mode)) {
+ if (!quiet) printf("%s: not a directory\n", arg);
return;
}
- strncat(toybuf, "/..", sizeof(toybuf));
- stat(toybuf, &st2);
- res = (st1.st_dev != st2.st_dev) ||
- (st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino);
- if (!quiet) printf("%s is %sa mountpoint\n", toys.optargs[0], res ? "" : "not ");
+
+ arg = xmprintf("%s/..", arg);
+ xstat(arg, &st2);
+ if (CFG_TOYBOX_FREE) free(arg);
+
+ // If the device is different, it's a mount point. If the device _and_
+ // inode are the same, it's probably "/". This misses --bind mounts from
+ // elsewhere in the same filesystem, but so does the other one and in the
+ // absence of a spec I guess that's the expected behavior?
+ toys.exitval = !(st1.st_dev != st2.st_dev || st1.st_ino == st2.st_ino);
if (toys.optflags & FLAG_d)
printf("%u:%u\n", major(st1.st_dev), minor(st1.st_dev));
- toys.exitval = res ? 0 : 1;
+ else if (!quiet)
+ printf("%s is %sa mountpoint\n", *toys.optargs, toys.exitval ? "not " : "");
}