SERVER-30565 Move burn_in_tests.py invocation out of compile task

(cherry picked from commit 7969a3e83d918a9a3ccaae65c6509b1abad4b34e)

Also includes the following related fix:
SERVER-30634 Fix burn_in_tests test detection on Windows
(cherry picked from commit 6b815203b752f4a1e1f8f810b7dda5e0a331b4ea)

1 files changed, 31 insertions, 8 deletions

diff --git a/etc/evergreen.yml b/etc/evergreen.yml
index 3d62987e75a..4aee63f0e35 100644
--- a/etc/evergreen.yml
+++ b/etc/evergreen.yml
@@ -1278,14 +1278,6 @@ tasks:
             ${strip_command|/usr/bin/strip} mongobridge
           fi
 
-          # If this is a scheduled build, we check for changes against the last scheduled commit.
-          if [ "${is_patch}" != "true" ]; then
-            burn_in_args="--checkEvergreen"
-          fi
-
-          # Capture a list of new and modified tests.
-          ${python|/opt/mongodbtoolchain/v2/bin/python2} buildscripts/burn_in_tests.py --branch=${branch_name} --buildVariant=${build_variant} --testListOutfile=jstests/new_tests.json --noExec $burn_in_args
-
           # On windows we need to make sure the paths in unittests.txt are compatible with cygwin tar
           sed 's|\\|/|g' build/unittests.txt > build/unittests-tarlist.txt
           ${tar|tar} -czvf mongodb-unittests.tgz -T build/unittests-tarlist.txt build/unittests.txt
@@ -1422,7 +1414,38 @@ tasks:
   depends_on:
   - name: compile
   commands:
+  - command: git.get_project
+    # The repository is cloned in a directory distinct from src for the modified test detection
+    # because the extraction of the artifacts performed in the 'do setup' causes
+    # 'git diff --name-only' to see all tests as modified on Windows (git 1.9.5). See SERVER-30634.
+    params:
+      directory: burn_in_tests_clonedir
+      revisions: # for each module include revision as <module_name> : ${<module_name>_rev}
+        enterprise: ${enterprise_rev}
+  - command: shell.exec
   - func: "do setup"
+  - func: "set up virtualenv"
+  - command: shell.exec
+    params:
+      working_dir: burn_in_tests_clonedir
+      script: |
+        set -o errexit
+        # Create a symbolic link to the venv in the src directory so activate_virtualenv can use it
+        # if it exists.
+        ln -s ../src/venv venv
+        ${activate_virtualenv}
+        set -o verbose
+        # If this is a scheduled build, we check for changes against the last scheduled commit.
+        if [ "${is_patch}" != "true" ]; then
+          burn_in_args="--checkEvergreen"
+        fi
+        # Copy the dbtest executable from the src dir because burn_in_tests.py calls it to get the
+        # list of dbtest suites.
+        cp ../src/dbtest${exe} .
+        # Capture a list of new and modified tests.
+        ${python|/opt/mongodbtoolchain/v2/bin/python2} buildscripts/burn_in_tests.py --branch=${branch_name} --buildVariant=${build_variant} --testListOutfile=jstests/new_tests.json --noExec $burn_in_args
+        # Copy the results to the src dir.
+        cp jstests/new_tests.json ../src/jstests/new_tests.json
   - func: "do multiversion setup"
   - func: "run tests"
     vars: