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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_knr2aed692vi2g8amimns7jahd, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
static PKIKeyPair keyPairForProgram() {
  lock programLock();
  File f = secretProgramFile("key-pair.txt");
  pcall {
    PKIKeyPair pair = pkiKeyPairFromTwoLineFile(f);
    if (pair != null) ret pair;
  }
  PKIKeyPair pair = pki_newKeyPair();
  saveTextFile(f, linesLL(pair.publicKey, pair.privateKey));
  ret pair;
}