Re: [Libguestfs] modifying open_guest function (copy_over.c)

It works, but I should delete if (guestfs_umount_all (destg) == -1)     exit (EXIT_FAILURE); inmain() function and /* Clean up. */   if (guestfs_umount_all (srcg) == -1) {     pthread_cancel (threaddata->mainthread);     exit (EXIT_FAILURE);   } in the start_scrthread() function or it will return an error after the program finish: libguestfs: error: umount_all: umount: /sys/fs/cgroup/systemd: umount: /sys/fs/cgroup/systemd: device is busy.         (In some cases useful info about processes that use          the device is found by lsof(8) or fuser(1))