Support 'docker update' command.

Signed-off-by: Dong Chen <dongluo.chen@docker.com>

api/primary.go

@@ -70,6 +70,7 @@ var routes = map[string]map[string]handler{
 		"/containers/{name:.*}/restart":       proxyContainerAndForceRefresh,
 		"/containers/{name:.*}/start":         proxyContainerAndForceRefresh,
 		"/containers/{name:.*}/stop":          proxyContainerAndForceRefresh,
+		"/containers/{name:.*}/update":        proxyContainerAndForceRefresh,
 		"/containers/{name:.*}/wait":          proxyContainerAndForceRefresh,
 		"/containers/{name:.*}/resize":        proxyContainer,
 		"/containers/{name:.*}/attach":        proxyHijack,

test/integration/api/update.bats

@@ -0,0 +1,56 @@
+#!/usr/bin/env bats
+
+load ../helpers
+
+function teardown() {
+	swarm_manage_cleanup
+	stop_docker
+}
+
+@test "docker update" {
+	# docker update is introduced in docker 1.10, skip older version without update command
+	run docker help update
+	if [[ "${output}" != *"Usage:	docker update"* ]]; then
+		skip
+	fi
+
+	start_docker_with_busybox 1
+	swarm_manage
+	docker_swarm run -d --name test_container \
+				-m=10M \
+				--cpu-period=50000 \
+				--cpu-quota=25000 \
+				--blkio-weight=300 \
+			busybox sleep 100
+
+	run docker_swarm inspect test_container
+	[ "$status" -eq 0 ]
+	[[ "${output}" == *"\"Memory\": 10485760"* ]]
+	[[ "${output}" == *"\"CpuPeriod\": 50000"* ]]
+	[[ "${output}" == *"\"CpuQuota\": 25000"* ]]
+	[[ "${output}" == *"\"BlkioWeight\": 300"* ]]
+
+	# validate docker info reflects the resource change
+	run docker_swarm info
+	[ "$status" -eq 0 ]
+	[[ "${output}" == *"Reserved Memory: 10 MiB"* ]]
+
+	run docker_swarm update \
+				-m=100M \
+				--cpu-period=50000 \
+				--cpu-quota=5000 \
+				--blkio-weight=600 \
+			test_container
+	[ "$status" -eq 0 ]
+
+	run docker_swarm inspect test_container
+	[ "$status" -eq 0 ]
+	[[ "${output}" == *"\"Memory\": 104857600"* ]]
+	[[ "${output}" == *"\"CpuQuota\": 5000"* ]]
+	[[ "${output}" == *"\"BlkioWeight\": 600"* ]]
+
+	# validate docker info reflects the resource change
+	run docker_swarm info
+	[ "$status" -eq 0 ]
+	[[ "${output}" == *"Reserved Memory: 100 MiB"* ]]
+}