Add in a nifty function for mount to use.

 -Erik

1 files changed, 36 insertions, 0 deletions

diff --git a/utility.c b/utility.c
index 29edbf1c4..37f698ea4 100644
--- 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