Pass the --tmp value into run_creator and cleanup after a crash

Crashing can sometimes leave directories in /var/tmp/lmc-* so clean
those up after run_creator is finished.

src/pylorax/api/config.py

@@ -48,6 +48,7 @@ def configure(conf_file="/etc/lorax/composer.conf", root_dir="/", test_config=Fa
     conf.set("composer", "yum_root", os.path.realpath(joinpaths(root_dir, "/var/tmp/composer/yum/root/")))
     conf.set("composer", "repo_dir", os.path.realpath(joinpaths(root_dir, "/var/tmp/composer/repos.d/")))
     conf.set("composer", "cache_dir", os.path.realpath(joinpaths(root_dir, "/var/tmp/composer/cache/")))
+    conf.set("composer", "tmp", os.path.realpath(joinpaths(root_dir, "/var/tmp/")))
 
     conf.add_section("users")
     conf.set("users", "root", "1")

src/pylorax/api/queue.py

@@ -47,7 +47,8 @@ def start_queue_monitor(cfg, uid, gid):
     """
     lib_dir = cfg.get("composer", "lib_dir")
     share_dir = cfg.get("composer", "share_dir")
-    monitor_cfg = DataHolder(composer_dir=lib_dir, share_dir=share_dir, uid=uid, gid=gid)
+    tmp = cfg.get("composer", "tmp")
+    monitor_cfg = DataHolder(composer_dir=lib_dir, share_dir=share_dir, uid=uid, gid=gid, tmp=tmp)
     p = mp.Process(target=monitor, args=(monitor_cfg,))
     p.daemon = True
     p.start()
@@ -169,7 +170,7 @@ def make_compose(cfg, results_dir):
     cfg_dict["squashfs_args"] = None
 
     cfg_dict["lorax_templates"] = cfg.share_dir
-    cfg_dict["tmp"] = "/var/tmp/"
+    cfg_dict["tmp"] = cfg.tmp
     cfg_dict["dracut_args"] = None                  # Use default args for dracut
 
     # Compose things in a temporary directory inside the results directory
@@ -206,6 +207,10 @@ def make_compose(cfg, results_dir):
             # Extract the results of the compose into results_dir and cleanup the compose directory
             move_compose_results(install_cfg, results_dir)
     finally:
+        # Make sure any remaining temporary directories are removed (eg. if there was an exception)
+        for d in glob(joinpaths(cfg.tmp, "lmc-*")):
+            shutil.rmtree(d)
+
         # Make sure that everything under the results directory is owned by the user
         user = pwd.getpwuid(cfg.uid).pw_name
         group = grp.getgrgid(cfg.gid).gr_name

src/sbin/lorax-composer

@@ -210,6 +210,7 @@ if __name__ == '__main__':
         sys.exit(1)
 
     server.config["COMPOSER_CFG"] = configure(conf_file=opts.config)
+    server.config["COMPOSER_CFG"].set("composer", "tmp", opts.tmp)
 
     # Make sure the git repo can be accessed by the API uid/gid
     if os.path.exists(opts.BLUEPRINTS):