container.h

   1 /*
   2  * Copyright (C) 2019 Paul Spooren <mail@aparcar.de>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU Lesser General Public License version 2.1
   6  * as published by the Free Software Foundation
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #ifndef __CONTAINER_H
  15 #define __CONTAINER_H
  16
  17 #include <stdlib.h>
  18 #include <stdbool.h>
  19 #include <sys/stat.h>
  20
  21 static inline bool is_container() {
  22         struct stat s;
  23         int r = stat("/.dockerenv", &s);
  24         return !!getenv("container") || r == 0;
  25 }
  26
  27 #endif