Separate scons cache by branch (#1836)

* separate scons cache by branch

* debug

* guess you can only call CacheDir once

* remove another call

* pass git branch and commit through

* copytree

* set CI

SConstruct

@@ -1,4 +1,5 @@
 import os
+import shutil
 import subprocess
 import sys
 import platform
@@ -161,10 +162,19 @@ env = Environment(
 )
 
 if os.environ.get('SCONS_CACHE'):
-  if QCOM_REPLAY:
-    CacheDir('/tmp/scons_cache_qcom_replay')
-  else:
-    CacheDir('/tmp/scons_cache')
+  cache_dir = '/tmp/scons_cache'
+
+  if os.getenv('CI'):
+    branch = os.getenv('GIT_BRANCH')
+
+    if QCOM_REPLAY:
+      cache_dir = '/tmp/scons_cache_qcom_replay'
+    elif branch is not None and branch != 'master':
+      cache_dir_branch = '/tmp/scons_cache_' + branch
+      if not os.path.isdir(cache_dir_branch) and os.path.isdir(cache_dir):
+        shutil.copytree(cache_dir, cache_dir_branch)
+      cache_dir = cache_dir_branch
+  CacheDir(cache_dir)
 
 node_interval = 5
 node_count = 0

selfdrive/test/phone_ci.py

@@ -44,7 +44,7 @@ def run_on_phone(test_cmd):
 
   # pass in all environment variables prefixed with 'CI_'
   for k, v in os.environ.items():
-    if k.startswith("CI_"):
+    if k.startswith("CI_") or k in ["GIT_BRANCH", "GIT_COMMIT"]:
       conn.send(f"export {k}='{v}'\n")
   conn.send("export CI=1\n")