update.py: fix memory leaks

We're kind of abusing some bitbake internals here and the result is that
there are a bunch of global lists and caches that simply grow as we
parse more layers, until available memory is exhausted. We don't care
about the contents of any of these within the layer index update script
so just clear them out between layers.

Should fix [YOCTO #7663].

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/layerindex/update.py b/layerindex/update.py
index a56507bf3a..50a7932bf7 100755
--- a/layerindex/update.py
+++ b/layerindex/update.py
@@ -582,6 +582,19 @@ def main():
                     transaction.rollback()
                 else:
                     transaction.commit()
+
+                # Slightly hacky way of avoiding memory leaks
+                bb.event.ui_queue = []
+                bb.parse.parse_py.BBHandler.cached_statements = {}
+                bb.codeparser.codeparsercache = bb.codeparser.CodeParserCache()
+                bb.codeparser.codecache = bb.codeparser.SetCache()
+                bb.fetch._checksum_cache = bb.checksum.FileChecksumCache()
+                bb.fetch.urldata_cache = {}
+                bb.fetch.saved_headrevs = {}
+                bb.parse.__pkgsplit_cache__={}
+                bb.parse.__mtime_cache = {}
+                bb.parse.init_parser(tinfoil.config_data)
+
             except KeyboardInterrupt:
                 transaction.rollback()
                 logger.warn("Update interrupted, changes to %s rolled back" % layer.name)