Download ccache from release PRs for backports

tests/ci/build_check.py

@@ -291,7 +291,9 @@ def main():
 
     logging.info("Will try to fetch cache for our build")
     try:
-        get_ccache_if_not_exists(ccache_path, s3_helper, pr_info.number, TEMP_PATH)
+        get_ccache_if_not_exists(
+            ccache_path, s3_helper, pr_info.number, TEMP_PATH, pr_info.release_pr
+        )
     except Exception as e:
         # In case there are issues with ccache, remove the path and do not fail a build
         logging.info("Failed to get ccache, building without it. Error: %s", e)

tests/ci/ccache_utils.py

@@ -11,6 +11,7 @@ import requests  # type: ignore
 
 from compress_files import decompress_fast, compress_fast
 from env_helper import S3_DOWNLOAD, S3_BUILDS_BUCKET
+from s3_helper import S3Helper
 
 DOWNLOAD_RETRIES_COUNT = 5
 
@@ -57,12 +58,19 @@ def dowload_file_with_progress(url, path):
 
 
 def get_ccache_if_not_exists(
-    path_to_ccache_dir, s3_helper, current_pr_number, temp_path
+    path_to_ccache_dir: str,
+    s3_helper: S3Helper,
+    current_pr_number: int,
+    temp_path: str,
+    release_pr: int,
 ) -> int:
     """returns: number of PR for downloaded PR. -1 if ccache not found"""
     ccache_name = os.path.basename(path_to_ccache_dir)
     cache_found = False
     prs_to_check = [current_pr_number]
+    # Release PR is either 0 or defined
+    if release_pr:
+        prs_to_check.append(release_pr)
     ccache_pr = -1
     if current_pr_number != 0:
         prs_to_check.append(0)

tests/ci/fast_test_check.py

@@ -125,7 +125,7 @@ if __name__ == "__main__":
 
     logging.info("Will try to fetch cache for our build")
     ccache_for_pr = get_ccache_if_not_exists(
-        cache_path, s3_helper, pr_info.number, temp_path
+        cache_path, s3_helper, pr_info.number, temp_path, pr_info.release_pr
     )
     upload_master_ccache = ccache_for_pr in (-1, 0)
 

tests/ci/pr_info.py

@@ -86,7 +86,7 @@ class PRInfo:
         self.changed_files = set()  # type: Set[str]
         self.body = ""
         self.diff_urls = []
-        self.release_pr = ""
+        self.release_pr = 0
         ref = github_event.get("ref", "refs/head/master")
         if ref and ref.startswith("refs/heads/"):
             ref = ref[11:]