fix inspect format result

Currently `docker inspect -f` use json.Unmarshal() unmarshal
to interface, it will store all JSON numbers in float64, so
we use `docker inspect 4f0d73b75a0d | grep Memory` and
`docker inspect -f {{.HostConfig.Memory}} 4f0d73b75a0d` will
get different values.

Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
Upstream-commit: b0ef3194aaa8c22b674ed5301c59e8e557a7e85e
Component: engine

components/engine/integration-cli/docker_cli_inspect_test.go

@@ -21,3 +21,23 @@ func (s *DockerSuite) TestInspectImage(c *check.C) {
 	}
 
 }
+
+func (s *DockerSuite) TestInspectInt64(c *check.C) {
+	runCmd := exec.Command(dockerBinary, "run", "-d", "-m=300M", "busybox", "true")
+	out, _, _, err := runCommandWithStdoutStderr(runCmd)
+	if err != nil {
+		c.Fatalf("failed to run container: %v, output: %q", err, out)
+	}
+
+	out = strings.TrimSpace(out)
+
+	inspectCmd := exec.Command(dockerBinary, "inspect", "-f", "{{.HostConfig.Memory}}", out)
+	inspectOut, _, err := runCommandWithOutput(inspectCmd)
+	if err != nil {
+		c.Fatalf("failed to inspect container: %v, output: %q", err, inspectOut)
+	}
+
+	if strings.TrimSpace(inspectOut) != "314572800" {
+		c.Fatalf("inspect got wrong value, got: %q, expected: 314572800", inspectOut)
+	}
+}