From 6eb3753dde6051b7cbf314ea9e17cc073d87bcdc Mon Sep 17 00:00:00 2001
From: Antoine Musso <hashar@free.fr>
Date: Fri, 24 Jan 2020 15:06:57 +0100
Subject: [PATCH] On CI, use a tmpfs for ZUUL_TEST_ROOT

Profiling shows git operations take significant time. They are done in
sub directories of a temporary directory optionally set via environment
variable ZUUL_TEST_ROOT.

Set ZUUL_TEST_ROOT at the jobs level.
When set, have test-setup to create a tmpfs.

Change-Id: I7923448aed1543593ace2cd9458b6c1b3ea60737
---
 .zuul.yaml          | 20 ++++++++++++++++++++
 tools/test-setup.sh |  6 ++++++
 2 files changed, 26 insertions(+)

diff --git a/.zuul.yaml b/.zuul.yaml
index e7379f63df..b9ad789b60 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -199,12 +199,22 @@
               - playbooks/zuul-migrate/.*
             nodeset: ubuntu-xenial
             timeout: 3600  # 60 minutes
+            vars:
+                test_setup_environment:
+                    ZUUL_TEST_ROOT: /tmp/zuul-test
+                tox_environment:
+                    ZUUL_TEST_ROOT: /tmp/zuul-test
         - tox-py37:
             irrelevant-files:
               - zuul/cmd/migrate.py
               - playbooks/zuul-migrate/.*
             timeout: 3600  # 60 minutes
             nodeset: ubuntu-bionic
+            vars:
+                test_setup_environment:
+                    ZUUL_TEST_ROOT: /tmp/zuul-test
+                tox_environment:
+                    ZUUL_TEST_ROOT: /tmp/zuul-test
         - zuul-build-dashboard
         - zuul-build-dashboard-multi-tenant
         - nodejs-npm-run-lint:
@@ -245,12 +255,22 @@
               - playbooks/zuul-migrate/.*
             nodeset: ubuntu-xenial
             timeout: 3600  # 60 minutes
+            vars:
+                test_setup_environment:
+                    ZUUL_TEST_ROOT: /tmp/zuul-test
+                tox_environment:
+                    ZUUL_TEST_ROOT: /tmp/zuul-test
         - tox-py37:
             irrelevant-files:
               - zuul/cmd/migrate.py
               - playbooks/zuul-migrate/.*
             timeout: 3600  # 60 minutes
             nodeset: ubuntu-bionic
+            vars:
+                test_setup_environment:
+                    ZUUL_TEST_ROOT: /tmp/zuul-test
+                tox_environment:
+                    ZUUL_TEST_ROOT: /tmp/zuul-test
         - zuul-build-dashboard
         - nodejs-npm-run-lint:
             vars:
diff --git a/tools/test-setup.sh b/tools/test-setup.sh
index e9ca7dca30..f4576ffb6a 100755
--- a/tools/test-setup.sh
+++ b/tools/test-setup.sh
@@ -12,6 +12,12 @@ sudo service zookeeper stop
 DATADIR=$(sed -n -e 's/^dataDir=//p' /etc/zookeeper/conf/zoo.cfg)
 sudo mount -t tmpfs -o nodev,nosuid,size=500M none $DATADIR
 
+# Prepare a tmpfs for Zuul test root
+if [[ -n "${ZUUL_TEST_ROOT:-}" ]]; then
+    sudo mkdir -p "$ZUUL_TEST_ROOT"
+    sudo mount -t tmpfs -o noatime,nodev,nosuid,size=64M none "$ZUUL_TEST_ROOT"
+fi
+
 # Be sure mysql and zookeeper are started.
 sudo service mysql start
 sudo service postgresql start