Prevent orphaned build steps

Dependencies

• [2] 7LWB2J2Z Periodically clear orphaned build steps
• [3] MHVIT4JY Split hydra-queue-runner.cc more
• [4] BRAESISH Warn if PostgreSQL appears stalled
• [5] UNVMKJV5 Unify build and step status codes
• [6] FITVNQ2S Keep track of the time we spend copying to/from build machines
• [7] HH3LID6L Re-implement log size limits
• [8] NTEDD7T4 Provide a plugin hook for when build steps finish
• [9] BG6PEOB2 Make the output size limit configurable

Change contents

• edit in src/hydra-queue-runner/builder.cc at line 111
  [2.124]

  [2.124]
  + printError("marking step %d of build %d as orphaned", stepNr, build->id);
• edit in src/hydra-queue-runner/builder.cc at line 180
  [3.5347]

  [3.5347]
  + assert(stepNr);
• edit in src/hydra-queue-runner/builder.cc at line 201
  [3.2664]

  [3.5814]
  +

  + assert(stepNr);
• edit in src/hydra-queue-runner/builder.cc at line 300
  [3.9316]

  [3.9316]
  + /* For standard failures, we don't care about the error

  + message. */

  + if (result.stepStatus != bsAborted)

  + result.errorMsg = "";

  +
• edit in src/hydra-queue-runner/builder.cc at line 311
  [3.9513]→[3.9513:9514](∅→∅)
  −
• edit in src/hydra-queue-runner/builder.cc at line 326
  [3.10246]→[3.10246:10273](∅→∅)
  − break;
• edit in src/hydra-queue-runner/builder.cc at line 328
  [3.10305]

  [3.10305]
  +

  + if (indirect.empty() && stepFinished) break;
• edit in src/hydra-queue-runner/builder.cc at line 337
  [3.10807]→[3.10807:10910](∅→∅),[3.10910]→[3.2749:2801](∅→∅),[3.795]→[3.11177:11220](∅→∅),[3.2801]→[3.11177:11220](∅→∅),[3.11177]→[3.11177:11220](∅→∅)
  − /* For standard failures, we don't care about the error

  − message. */

  − if (result.stepStatus != bsAborted)

  − result.errorMsg = "";

  −
• replacement in src/hydra-queue-runner/builder.cc at line 350
  [3.12003]→[3.3362:3420](∅→∅)
  − if (result.stepStatus != bsCachedFailure)
  [3.12003]

  [3.691]
  + if (result.stepStatus != bsCachedFailure && !stepFinished) {

  + assert(stepNr);
• edit in src/hydra-queue-runner/builder.cc at line 354
  [3.3519]

  [3.12211]
  + }