Add in a nifty function for mount to use.

 -Erik

diff --git a/utility.c b/utility.c
index 29edbf1c4899e898fe2940ba8ced040dadc7febc..37f698ea4452ff0711233a453a2f564c068782c0 100644 (file)
--- a/utility.c
+++ b/utility.c
@@ -1469,6 +1469,42 @@ extern char *find_unused_loop_device(void)
 }
 #endif                                                 /* BB_FEATURE_MOUNT_LOOP */
 
+#if defined BB_MOUNT
+char* find_real_root_device_name(void)
+{
+       int gotIt=0;
+       DIR *dir;
+       struct dirent *entry;
+       struct stat statBuf, rootStat;
+       char fileName[BUFSIZ];
+
+       if (stat("/", &rootStat) != 0)
+               fatalError("Wierd.  I could not stat '/'\n");
+
+       if (!(dir = opendir("/dev"));
+               fatalError("Wierd.  I could not open '/dev'\n");
+
+       while((entry = readdir(dir)) != NULL) {
+               /* Must skip ".." since that is "/", and so we 
+                * would get a false positive on ".."  */
+
+               if (strcmp(entry->d_name, "..") == 0)
+                       continue;
+
+               sprintf( fileName, "/dev/%s", entry->d_name);
+
+               if (stat(fileName, &statBuf) != 0)
+                       continue;
+               if (statBuf.st_rdev == rootStat.st_rdev) {
+                       return (strdup(fileName));
+               }
+       }
+
+       return( NULL);
+}
+#endif
+
+
 #if defined BB_MTAB
 #define whine_if_fstab_is_missing() {}
 #else