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-rw-r--r--lib/api/merge_requests.rb5
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/api/merge_requests.rb b/lib/api/merge_requests.rb
index 4e7de8867b4..db304abe1c3 100644
--- a/lib/api/merge_requests.rb
+++ b/lib/api/merge_requests.rb
@@ -218,6 +218,7 @@ module API
# merge_commit_message (optional) - Custom merge commit message
# should_remove_source_branch (optional) - When true, the source branch will be deleted if possible
# merge_when_build_succeeds (optional) - When true, this MR will be merged when the build succeeds
+ # sha (optional) - When present, must have the HEAD SHA of the source branch
# Example:
# PUT /projects/:id/merge_requests/:merge_request_id/merge
#
@@ -233,6 +234,10 @@ module API
render_api_error!('Branch cannot be merged', 406) unless merge_request.can_be_merged?
+ if params[:sha] && merge_request.source_sha != params[:sha]
+ render_api_error!("SHA does not match HEAD of source branch: #{merge_request.source_sha}", 409)
+ end
+
merge_params = {
commit_message: params[:merge_commit_message],
should_remove_source_branch: params[:should_remove_source_branch]