revlog: add punched revision flag
index flag to identify a revision as punched, i.e. it contains no data.
REVIDX_PUNCHED_FLAG = 2, is used to mark a revision as punched.
REVIDX_KNOWN_FLAGS is the accumulation of all index flags.
% hg init t
% hg add a
% hg commit
% hg verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
1 files, 1 changesets, 1 total revisions
% hg verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
verify failed
% hg verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
1 files, 1 changesets, 1 total revisions
% hg commit
commit failed
% hg diff
diff -r c1fab96507ef a
--- a/a
+++ b/a
@@ -1,1 +1,1 @@
-foo
+barber
% hg status
M a
? dir/a
% hg status
dir: Permission denied
M a