string vdc_cryptfs_cmd(string log_name) {
    string cmd;

    cmd = "LD_LIBRARY_PATH=/system/lib64:/system/lib /system/bin/vdc cryptfs";

#ifndef TW_CRYPTO_SYSTEM_VOLD_DEBUG
    (void)log_name; // do nothing, but get rid of compiler warning in non debug builds
#else
    if (has_timeout && has_strace)
        cmd = "/sbin/strace -q -tt -ff -v -y -s 1000 -o /tmp/strace_vdc_" + log_name + " /sbin/timeout -t 30 -s KILL env " + cmd;
    else if (has_strace)
        cmd = "/sbin/strace -q -tt -ff -v -y -s 1000 -o /tmp/strace_vdc_" + log_name + " -E " + cmd;
    else
#endif
    if (has_timeout)
        cmd = "/sbin/timeout -t 30 -s KILL env " + cmd;

    return cmd;
}