Start to use Danger for automating MR reviews

Signed-off-by: Rémy Coutable <remy@rymai.me>

1 files changed, 25 insertions, 0 deletions

diff --git a/danger/metadata/Dangerfile b/danger/metadata/Dangerfile
new file mode 100644
index 00000000000..033a84d6ecd
--- /dev/null
+++ b/danger/metadata/Dangerfile
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+# rubocop:disable Style/SignalException
+
+if gitlab.mr_body.size < 5
+  fail "Please provide a merge request description."
+end
+
+if gitlab.mr_labels.empty?
+  fail "Please add labels to this merge request."
+end
+
+unless gitlab.mr_json["assignee"]
+  warn "This merge request does not have any assignee yet. Setting an assignee clarifies who needs to take action on the merge request at any given time."
+end
+
+has_milestone = !gitlab.mr_json["milestone"].nil?
+
+unless has_milestone
+  warn "This merge request does not refer to an existing milestone.", sticky: false
+end
+
+has_pick_into_stable_label = gitlab.mr_labels.find { |label| label.start_with?('Pick into') }
+
+if gitlab.branch_for_base != "master" && !has_pick_into_stable_label
+  fail "All merge requests should target `master`. Otherwise, please set the relevant `Pick into X.Y` label."
+end