Add support for MCR/NO

Bug: b/203788354
Change-Id: I7e01cfb2e1e2dee636491baddbdf1309f7ba3ceb

code-owners.config

diff --git a/code-owners.config b/code-owners.config
new file mode 100644
index 0000000..5858a4b
--- /dev/null
+++ b/code-owners.config
@@ -0,0 +1,6 @@
+[codeOwners]
+	overrideApproval = Owners-Override+1
+	rejectNonResolvableCodeOwners = false
+	pathExpressions = SIMPLE
+	disabled = true
+	fallbackCodeOwners = ALL_USERS

project.config

diff --git a/project.config b/project.config
index 1ec2daf..33244ee 100644
--- a/project.config
+++ b/project.config
@@ -49,6 +49,11 @@
 	createTag = group Project Owners
 	createSignedTag = group Administrators
 	createSignedTag = group Project Owners
+[label "Bot-Commit"]
+	defaultValue = 0
+	value = 0 No score
+	value = +1 Looks good to me
+	function = NoBlock
 [label "Code-Review"]
 	function = MaxWithBlock
 	defaultValue = 0
@@ -60,6 +65,15 @@
 	value = 0 No score
 	value = +1 Looks good to me, but someone else must approve
 	value = +2 Looks good to me, approved
+	ignoreSelfApproval = false
+[label "Owners-Override"]
+	defaultValue = 0
+	value = 0 No score
+	value = +1 Looks good to me
+	function = NoBlock
+	copyAllScoresOnTrivialRebase = true
+	copyAllScoresIfNoCodeChange = true
+	copyAllScoresIfListOfFilesDidNotChange = true
 [access "refs/for/*"]
 	addPatchSet = group Registered Users
 	pushMerge = deny group Registered Users

rules.pl

diff --git a/rules.pl b/rules.pl
new file mode 100644
index 0000000..55d9a60
--- /dev/null
+++ b/rules.pl
@@ -0,0 +1,22 @@
+% If Bot-Commit+1 vote exists, replace all `need(_)` votes on Code-Review and
+% Verified with `may(_)` votes.
+% `ok(_)`s and `reject(_)`s are preserved.
+% This means that Code-Review and Verified labels are never needed to submit a
+% change, but may be approved or rejected.
+submit_filter(In, Out) :-
+  gerrit:commit_label(label('Bot-Commit', 1), _),
+  !,
+  In =.. [submit | A],
+  filter_label('Code-Review', A, B),
+  filter_label('Verified', B, C),
+  Out =.. [submit | C].
+% If Bot-Commit+1 is not present, do nothing.
+submit_filter(In, In).
+% Replace instances of `label(Name, need(_))` with `label(Name, may(_))` and
+% leave the rest unchanged.
+filter_label(_, [], []).
+filter_label(Name, [label(Name, need(_)) | Ls], [label(Name, may(_)) | Rs]) :-
+  !,
+  filter_label(Name, Ls, Rs).
+filter_label(Name, [L | Ls], [L | Rs]) :-
+  filter_label(Name, Ls, Rs).