Sync with latest Nix

Dependencies

• [2] WDGARQ76 Reuse build products / metrics stored in the database
• [3] 5CNQUQ77 Bump Nix
• [4] ACBS7C6Q hydra-queue-runner: Detect changes to the scheduling shares
• [5] 5AIYUMTB Basic remote building
• [6] BUEWVH2M Remove signing parameter (nix#f435f82)
• [7] IKJBYIGY Update to reflect BinaryCacheStore changes
• [8] PLA4FYMZ Fix regression caused by ee2e9f53
• [9] 24BMQDZA Start of single-process hydra-queue-runner
• [10] FITVNQ2S Keep track of the time we spend copying to/from build machines
• [11] L2IBPED2 Typo
• [12] BYVRA54Q Temporarily disable machines on any exception, not just connection failures
• [13] UVNTWTWG Prevent download of NARs we just uploaded
• [14] 73YR46NJ hydra-queue-runner: Write directly to a binary cache
• [15] 62MQPRXC Pass null values to libpqxx properly
• [*] MHVIT4JY Split hydra-queue-runner.cc more

Change contents

• replacement in src/hydra-queue-runner/build-remote.cc at line 227
  [4.2491]→[3.136:226](∅→∅)
  − copyClosure(ref<Store>(localStore), destStore, step->drv.inputSrcs, false, true);
  [4.2491]

  [4.3876]
  + copyClosure(ref<Store>(localStore), destStore, step->drv.inputSrcs, NoRepair, NoCheckSigs);
• replacement in src/hydra-queue-runner/build-remote.cc at line 419
  [4.8870]→[3.227:292](∅→∅)
  − destStore->importPaths(from, result.accessor, true);
  [4.8870]

  [4.231]
  + destStore->importPaths(from, result.accessor, NoCheckSigs);
• replacement in src/hydra-queue-runner/hydra-queue-runner.cc at line 438
  [4.824]→[4.824:948](∅→∅)
  − (printHash(product.sha1hash), product.isRegular)

  − (printHash(product.sha256hash), product.isRegular)
  [4.824]

  [4.18912]
  + (product.sha1hash.to_string(Base16, false), product.isRegular)

  + (product.sha256hash.to_string(Base16, false), product.isRegular)
• replacement in src/hydra-queue-runner/queue-monitor.cc at line 632
  [2.1702]→[2.1702:1782](∅→∅)
  − product.sha1hash = parseHash(htSHA1, row[3].as<std::string>());
  [2.1702]

  [2.1782]
  + product.sha1hash = Hash(row[3].as<std::string>(), htSHA1);
• replacement in src/hydra-queue-runner/queue-monitor.cc at line 634
  [2.1817]→[2.1817:1901](∅→∅)
  − product.sha256hash = parseHash(htSHA256, row[4].as<std::string>());
  [2.1817]

  [2.1901]
  + product.sha256hash = Hash(row[4].as<std::string>(), htSHA256);