software/erp5: add control for PYTHONHASHSEED

See https://docs.python.org/3/using/cmdline.html#envvar-PYTHONHASHSEED

Setting a value will set the environment variable for all processes
and for the test runner.

Default behavior is:
  - for zope, do not set the variable, so default python behavior will
  be used ( equivalent to setting `0` on python2 and `random` on python3)
  - for test runner, generate a random value for each execution and
  print it, to make it easy to re-run a failing test with the same seed.

software/erp5/instance-erp5-input-schema.json

@@ -107,6 +107,18 @@
       "description": "Set open file descriptors soft limit to hard limit",
       "type": "boolean"
     },
+    "python-hash-seed": {
+      "description": "Sets the value of `PYTHONHASHSEED` environment variable for zope processes and test runner. If not provided, zope processes use python default (`0` for python2, `random` for python3) and test runner generates a random `PYTHONHASHSEED`.",
+      "oneOf": [
+        {
+          "type": "number"
+        },
+        {
+          "const": "random",
+          "type": "string"
+        }
+      ]
+    },
     "family-override": {
       "description": "Family-wide options, possibly overriding global options",
       "default": {},

stack/erp5/buildout.cfg

@@ -272,6 +272,7 @@ link-binary =
   ${sed:location}/bin/sed
   ${tesseract:location}/bin/tesseract
   ${w3m:location}/bin/w3m
+  ${coreutils:location}/bin/shuf
 fonts =
   ${liberation-fonts:location}
   ${ipaex-fonts:location}

stack/erp5/buildout.hash.cfg

@@ -86,7 +86,7 @@ md5sum = 0ac4b74436f554cd677f19275d18d880
 
 [template-zope]
 filename = instance-zope.cfg.in
-md5sum = 6178ba7b42848f9e2412ab898a7b026c
+md5sum = 51ce470811f4ad0f1e3e44505acf4045
 
 [template-balancer]
 filename = instance-balancer.cfg.in

stack/erp5/instance-zope.cfg.in

@@ -85,6 +85,9 @@ environment +=
   JUPYTER_PATH=${directory:jupyter-dir}
   JUPYTER_CONFIG_DIR=${directory:jupyter-config-dir}
   JUPYTER_RUNTIME_DIR=${directory:jupyter-runtime-dir}
+{% if slapparameter_dict.get('python-hash-seed') %}
+  PYTHONHASHSEED={{ slapparameter_dict['python-hash-seed'] }}
+{% endif %}
 {% if slapparameter_dict.get('wendelin-core-zblk-fmt') %}
   WENDELIN_CORE_ZBLK_FMT={{ slapparameter_dict['wendelin-core-zblk-fmt'] }}
 {% endif %}
@@ -469,9 +472,23 @@ context =
 {% else -%}
 [{{ section('run-unit-test-userhosts-wrapper') }}]
 <= userhosts-wrapper-base
-wrapped-command-line = ${runUnitTest:wrapper-path}
+wrapped-command-line = ${run-unit-test-python-hash-seed-wrapper:output}
 wrapper-path = ${buildout:bin-directory}/runUnitTest
 
+[{{ section('run-unit-test-python-hash-seed-wrapper') }}]
+recipe = slapos.recipe.template
+inline =
+  #!/bin/sh
+  if [ -z "$PYTHONHASHSEED" ]; then
+    PYTHONHASHSEED=$(${buildout:bin-directory}/shuf -i 1-1024 -n 1)
+    export PYTHONHASHSEED
+    echo "Generated PYTHONHASHSEED: $PYTHONHASHSEED"
+  else
+    echo "Using PYTHONHASHSEED: $PYTHONHASHSEED"
+  fi
+  exec ${runUnitTest:wrapper-path} "$@"
+output = ${buildout:bin-directory}/runUnitTest.python-hash-seed
+
 [{{ section('run-test-suite-userhosts-wrapper') }}]
 <= userhosts-wrapper-base
 wrapped-command-line = ${runTestSuite:wrapper-path}