[FIX] runbot: invalidate cache at each commit.

In some rare case db could become inconsistent if some data
in cache were used between two _schedule loop turn.

runbot/models/build.py

@@ -508,6 +508,7 @@ class runbot_build(models.Model):
 
         for build in self:
             self.env.cr.commit()  # commit between each build to minimise transactionnal errors due to state computations
+            self.invalidate_cache()
             if build.local_state == 'deathrow':
                 build._kill(result='manually_killed')
                 continue
@@ -607,6 +608,8 @@ class runbot_build(models.Model):
             # cleanup only needed if it was not killed
             if build.local_state == 'done':
                 build._local_cleanup()
+        self.env.cr.commit()
+        self.invalidate_cache()
 
     def _path(self, *l, **kw):
         """Return the repo build path"""
@@ -794,6 +797,7 @@ class runbot_build(models.Model):
             self.env.cr.commit()
             build._github_status()
             build._local_cleanup()
+            self.invalidate_cache()
 
     def _ask_kill(self):
         # todo xdo, should we kill or skip children builds? it looks like yes, but we need to be carefull if subbuild can be duplicates

runbot/models/build_config.py

@@ -261,6 +261,7 @@ class ConfigStep(models.Model):
         build_path = build._path()
         build_port = build.port
         self.env.cr.commit()  # commit before docker run to be 100% sure that db state is consistent with dockers
+        self.invalidate_cache()
         return docker_run(build_odoo_cmd(cmd), log_path, build_path, docker_name, exposed_ports=[build_port, build_port + 1])
 
     def _run_odoo_install(self, build, log_path):

runbot/models/repo.py

@@ -370,6 +370,7 @@ class runbot_repo(models.Model):
         build_ids = Build.search(domain_host + [('local_state', 'in', ['testing', 'running', 'deathrow'])])
         build_ids._schedule()
         self.env.cr.commit()
+        self.invalidate_cache()
 
         # launch new tests
 
@@ -382,6 +383,7 @@ class runbot_repo(models.Model):
                 # commit transaction to reduce the critical section duration
                 def allocate_builds(where_clause, limit):
                     self.env.cr.commit()
+                    self.invalidate_cache()
                     # self-assign to be sure that another runbot instance cannot self assign the same builds
                     query = """UPDATE
                                     runbot_build
@@ -421,7 +423,6 @@ class runbot_repo(models.Model):
             pending_build = Build.search(domain_host + [('local_state', '=', 'pending')], limit=available_slots)
             if pending_build:
                 pending_build._schedule()
-                self.env.cr.commit()
 
         # terminate and reap doomed build
         build_ids = Build.search(domain_host + [('local_state', '=', 'running')]).ids