hydra-queue-runner: Support running in a NixOS container

Dependencies

• [2] PW4TLMWS Sync with latest Nix
• [3] G7KWXSFM Distinguish build step states
• [4] 2BPAQMDH hydra-queue-runner: better error message if nix-store can not be started
• [5] IKJBYIGY Update to reflect BinaryCacheStore changes
• [6] EVSK5TBB Fix version test
• [7] 5AIYUMTB Basic remote building
• [8] PLA4FYMZ Fix regression caused by ee2e9f53
• [9] BYVRA54Q Temporarily disable machines on any exception, not just connection failures
• [10] LSUX6IQR Update to latest nixUnstable
• [11] SL3WSRAC hydra-queue-runner: Limit memory usage
• [12] 73YR46NJ hydra-queue-runner: Write directly to a binary cache
• [13] VZKB5CIE Workaround for RemoteStore not supporting cmdBuildDerivation yet
• [14] 7VQ4ALFY Update "make check" for the new queue runner
• [15] FITVNQ2S Keep track of the time we spend copying to/from build machines
• [16] EFWDY2V7 Support testing build determinism
• [17] 5CNQUQ77 Bump Nix
• [18] 4VYY2ADP Allow the machines file to specify host public keys
• [19] BG6PEOB2 Make the output size limit configurable
• [*] HJOEIMLR Refactor

Change contents

• replacement in src/hydra-queue-runner/build-remote.cc at line 51
  [5.297]→[4.21:68](∅→∅)
  − if (machine->sshName == "localhost") {
  [5.297]

  [4.68]
  + if (machine->isLocalhost()) {
• replacement in src/hydra-queue-runner/build-remote.cc at line 193
  [5.917]→[5.917:973](∅→∅)
  − if (GET_PROTOCOL_MINOR(remoteVersion) >= 1)
  [5.917]

  [5.973]
  + // Always send the derivation to localhost, since it's a

  + // no-op anyway but we might not be privileged to use

  + // cmdBuildDerivation (e.g. if we're running in a NixOS

  + // container).

  + if (GET_PROTOCOL_MINOR(remoteVersion) >= 1 && !machine->isLocalhost())
• replacement in src/hydra-queue-runner/build-remote.cc at line 243
  [5.2491]→[2.0:100](∅→∅)
  − copyClosure(ref<Store>(localStore), destStore, step->drv.inputSrcs, NoRepair, NoCheckSigs);
  [5.2491]

  [5.3876]
  + if (localStore != std::shared_ptr<Store>(destStore))

  + copyClosure(ref<Store>(localStore), destStore, step->drv.inputSrcs, NoRepair, NoCheckSigs);
• replacement in src/hydra-queue-runner/build-remote.cc at line 247
  [5.2581]→[5.2581:2639](∅→∅)
  − if (/* machine->sshName != "localhost" */ true) {
  [5.2581]

  [5.0]
  + if (!machine->isLocalhost()) {
• replacement in src/hydra-queue-runner/build-remote.cc at line 389
  [5.7000]→[5.7000:7058](∅→∅)
  − if (/* machine->sshName != "localhost" */ true) {
  [5.7000]

  [3.356]
  + result.accessor = destStore->getFSAccessor();

  +

  + if (!machine->isLocalhost() || localStore != std::shared_ptr<Store>(destStore)) {
• edit in src/hydra-queue-runner/build-remote.cc at line 436
  [5.8736]→[5.678:679](∅→∅),[5.678]→[5.678:679](∅→∅),[5.679]→[5.8737:8795](∅→∅)
  −

  − result.accessor = destStore->getFSAccessor();
• edit in src/hydra-queue-runner/state.hh at line 277
  [21.4328]

  [21.4328]
  +

  + bool isLocalhost()

  + {

  + return sshName == "localhost";

  + }