tools/kvm/guest/init.c

   1 /*
   2  * This is a simple init for shared rootfs guests. It brings up critical
   3  * mountpoints and then launches /bin/sh.
   4  */
   5 #include <sys/mount.h>
   6 #include <string.h>
   7 #include <unistd.h>
   8 #include <stdio.h>
   9 #include <errno.h>
  10
  11 static int run_process(char *filename)
  12 {
  13         char *new_argv[] = { filename, NULL };
  14         char *new_env[] = { NULL };
  15
  16         return execve(filename, new_argv, new_env);
  17 }
  18
  19 static void do_mounts(void)
  20 {
  21         mount("hostfs", "/host", "9p", MS_RDONLY, "trans=virtio,version=9p2000.L");
  22         mount("", "/sys", "sysfs", 0, NULL);
  23         mount("proc", "/proc", "proc", 0, NULL);
  24         mount("devtmpfs", "/dev", "devtmpfs", 0, NULL);
  25 }
  26
  27 int main(int argc, char *argv[])
  28 {
  29         puts("Mounting...");
  30
  31         do_mounts();
  32
  33         puts("Starting '/bin/sh'...");
  34
  35         run_process("/bin/sh");
  36
  37         printf("Init failed: %s\n", strerror(errno));
  38
  39         return 0;
  40 }