* src/cuirass/remote.scm (zmq-server-info, zmq-worker-request-info-message):
New procedures.
* src/cuirass/remote-server.scm (%log-port, %publish-port): New parameters.
(read-worker-exp): Handle 'worker-request-info message.
(remote-server): Set the new parameters.
* src/cuirass/remote-worker.scm (start-worker): Rename "server" argument. Send
a 'worker-request-info message to discover the server log port and publish
port.
(remote-worker): Adapt it.
* src/sql/upgrade-4.sql: New file.
* Makefile.am (dist_sql_DATA): Add it.
* src/schema.sql (Builds)[weather]: New field.
(Builds_weather_evaluation): New index.
* src/cuirass/database.scm (db-get-last-status): New procedure.
(db-update-build-status!): Use it and update the new weather field.
(db-get-builds): Adapt it.
* tests/http.scm (build-query-result): Ditto.
* src/cuirass/database.scm (build-weather): New macro.
(build-status->weather): New procedure.
(db-get-builds): Return the build weather using the new procedure.
* src/cuirass/http.scm (build->hydra-build): Also return the weather.
* src/cuirass/templates.scm (weather-class, weather-title): New procedures.
(build-eval-table): Display the weather.
* tests/database.scm ("db-get-build weather"): New tests.
* tests/http.scm (build-query-result): Adapt it.
* src/cuirass/database.scm (db-update-build-status): Only consider evaluations
that happened before the current one. This is useful when updating the build
status of old evaluations.
* src/sql/upgrade-3.sql: New file.
* Makefile.am (dist_sql_DATA): Add it.
* src/schema.sql (Builds)[last_status]: New field.
* src/cuirass/database.scm (db-update-build-status!): Honor it.
(db-get-builds): Return it.
* tests/database.scm ("db-update-build-status!"): New test.
Evaluations are added sequentially to database but builds are not always
registered nor performed in order. This means that a build corresponding to an
older evaluation can be returned first if it was completed last. Order by
descending evaluation id to prevent it.
* src/cuirass/database.scm (db-get-builds): Add "evaluation" order.
* src/cuirass/http.scm (url-handler): Order latestbuilds by descending
evaluation number.
* src/cuirass/database.scm (db-add-worker): Rename ...
(db-add-or-update-worker): ... into this new procedure.
(db-get-worker, db-remove-unresponsive-workers): New procedures.
* src/cuirass/remote-server.scm (%workers): Remove it.
(pop-build): Adapt it.
(remove-unresponsive-workers!): Remove it.
(read-worker-exp): Adapt it.
(zmq-start-proxy): Ditto.
* tests/database.scm ("db-add-worker"): Rename ...
("db-add-or-update-worker"): ... into this new test.
("db-get-worker", "db-remove-unresponsive-workers"): New tests.
* src/cuirass/remote.scm: New file.
* src/cuirass/remote-server.scm: New file.
* src/cuirass/remote-worker.scm: New file.
* bin/remote-server.in: New file.
* bin/remote-worker.in: New file.
* Makefile.am (bin_SCRIPTS): Add new binaries,
(dist_pkgmodule_DATA): add new files,
(EXTRA_DIST): add new binaries,
(bin/remote-server, bin/remote-worker): new targets.
* .gitignore: Add new binaries.
* bin/cuirass.in (%options): Add "--build-remote" option,
(show-help): document it,
(main): honor it.
* src/cuirass/base.scm (with-build-offload-thread): New macro,
(%build-remote?, %build-offload-channel): new parameters,
(make-build-offload-thread): new procedure,
(build-derivations/offload): new procedure,
(restart-builds): use it to offload builds when %build-remote? is set,
(build-packages): ditto.
