Untested generic solution for real root.

scan-filesystem/cython/main.pyx

@@ -271,6 +271,7 @@ cdef int start(const char *path) nogil:
         dev_whitelist_paths.append(b'/boot/efi')
         dev_whitelist_paths.append(b'/root')
         dev_whitelist_paths.append(b'/sysroot')
+        dev_whitelist_paths.append(path)
 
         dev_whitelist = cyplist[dev_t]()
         for p in dev_whitelist_paths:
@@ -322,8 +323,11 @@ cdef int start(const char *path) nogil:
 
         return 0
 
-cdef public int main() nogil:
-    return start(<char*>'/')
+cdef public int main(int argc, char* argv[]) nogil:
+    if argc >= 2:
+        return start(<char*>argv[1])
+    else:
+        return start(<char*>'/')
 
 #def python_main():
 #    start(<char*>'.')