Ensure "rabbitmqadmin" is extracted and ready for use in the management image variants

Author: tianon

3.6/alpine/management/Dockerfile

@@ -2,4 +2,26 @@ FROM rabbitmq:alpine
 
 RUN rabbitmq-plugins enable --offline rabbitmq_management
 
+# extract "rabbitmqadmin" from inside the "rabbitmq_management-X.Y.Z.ez" plugin zipfile
+# see https://github.com/docker-library/rabbitmq/issues/207
+RUN set -eux; \
+	erl -noinput -eval ' \
+		{ ok, AdminBin } = zip:foldl(fun(FileInArchive, GetInfo, GetBin, Acc) -> \
+			case Acc of \
+				"" -> \
+					case lists:suffix("/rabbitmqadmin", FileInArchive) of \
+						true -> GetBin(); \
+						false -> Acc \
+					end; \
+				_ -> Acc \
+			end \
+		end, "", init:get_plain_arguments()), \
+		io:format("~s", [ AdminBin ]), \
+		init:stop(). \
+	' -- /plugins/rabbitmq_management-*.ez > /usr/local/bin/rabbitmqadmin; \
+	[ -s /usr/local/bin/rabbitmqadmin ]; \
+	chmod +x /usr/local/bin/rabbitmqadmin; \
+	apk add --no-cache python; \
+	rabbitmqadmin --version
+
 EXPOSE 15671 15672

3.6/debian/management/Dockerfile

@@ -2,4 +2,28 @@ FROM rabbitmq
 
 RUN rabbitmq-plugins enable --offline rabbitmq_management
 
+# extract "rabbitmqadmin" from inside the "rabbitmq_management-X.Y.Z.ez" plugin zipfile
+# see https://github.com/docker-library/rabbitmq/issues/207
+RUN set -eux; \
+	erl -noinput -eval ' \
+		{ ok, AdminBin } = zip:foldl(fun(FileInArchive, GetInfo, GetBin, Acc) -> \
+			case Acc of \
+				"" -> \
+					case lists:suffix("/rabbitmqadmin", FileInArchive) of \
+						true -> GetBin(); \
+						false -> Acc \
+					end; \
+				_ -> Acc \
+			end \
+		end, "", init:get_plain_arguments()), \
+		io:format("~s", [ AdminBin ]), \
+		init:stop(). \
+	' -- /plugins/rabbitmq_management-*.ez > /usr/local/bin/rabbitmqadmin; \
+	[ -s /usr/local/bin/rabbitmqadmin ]; \
+	chmod +x /usr/local/bin/rabbitmqadmin; \
+	apt-get update; \
+	apt-get install -y --no-install-recommends python; \
+	rm -rf /var/lib/apt/lists/*; \
+	rabbitmqadmin --version
+
 EXPOSE 15671 15672