Sort output of docker ps --filter with order by creation time

This fix tries to address the issue raised in 25374 where the
output of `docker ps --filter` is in random order and
not deterministic.

This fix sorts the list of containers by creation time so that the
output is deterministic.

An integration test has been added.

This fix fixes 25374.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

daemon/list.go

@@ -3,6 +3,7 @@ package daemon
 import (
 	"errors"
 	"fmt"
+	"sort"
 	"strconv"
 	"strings"
 
@@ -86,6 +87,15 @@ type listContext struct {
 	*types.ContainerListOptions
 }
 
+// byContainerCreated is a temporary type used to sort a list of containers by creation time.
+type byContainerCreated []*container.Container
+
+func (r byContainerCreated) Len() int      { return len(r) }
+func (r byContainerCreated) Swap(i, j int) { r[i], r[j] = r[j], r[i] }
+func (r byContainerCreated) Less(i, j int) bool {
+	return r[i].Created.UnixNano() < r[j].Created.UnixNano()
+}
+
 // Containers returns the list of containers to show given the user's filtering.
 func (daemon *Daemon) Containers(config *types.ContainerListOptions) ([]*types.Container, error) {
 	return daemon.reduceContainers(config, daemon.transformContainer)
@@ -149,6 +159,11 @@ func (daemon *Daemon) filterByNameIDMatches(ctx *listContext) []*container.Conta
 	for id := range matches {
 		cntrs = append(cntrs, daemon.containers.Get(id))
 	}
+
+	// Restore sort-order after filtering
+	// Created gives us nanosec resolution for sorting
+	sort.Sort(sort.Reverse(byContainerCreated(cntrs)))
+
 	return cntrs
 }
 

integration-cli/docker_cli_ps_test.go

@@ -864,3 +864,37 @@ func (s *DockerSuite) TestPsListContainersFilterNetwork(c *check.C) {
 
 	c.Assert(containerOut, checker.Contains, "onbridgenetwork")
 }
+
+func (s *DockerSuite) TestPsByOrder(c *check.C) {
+	name1 := "xyz-abc"
+	out, err := runSleepingContainer(c, "--name", name1)
+	c.Assert(err, checker.NotNil)
+	c.Assert(strings.TrimSpace(out), checker.Not(checker.Equals), "")
+	container1 := strings.TrimSpace(out)
+
+	name2 := "xyz-123"
+	out, err = runSleepingContainer(c, "--name", name2)
+	c.Assert(err, checker.NotNil)
+	c.Assert(strings.TrimSpace(out), checker.Not(checker.Equals), "")
+	container2 := strings.TrimSpace(out)
+
+	name3 := "789-abc"
+	out, err = runSleepingContainer(c, "--name", name3)
+	c.Assert(err, checker.NotNil)
+	c.Assert(strings.TrimSpace(out), checker.Not(checker.Equals), "")
+
+	name4 := "789-123"
+	out, err = runSleepingContainer(c, "--name", name4)
+	c.Assert(err, checker.NotNil)
+	c.Assert(strings.TrimSpace(out), checker.Not(checker.Equals), "")
+
+	// Run multiple time should have the same result
+	out, err = dockerCmd(c, "ps", "--no-trunc", "-q", "-f", "name=xyz")
+	c.Assert(err, checker.NotNil)
+	c.Assert(strings.TrimSpace(out), checker.Equals, fmt.Sprintf("%s\n%s", container2, container1))
+
+	// Run multiple time should have the same result
+	out, err = dockerCmd(c, "ps", "--no-trunc", "-q", "-f", "name=xyz")
+	c.Assert(err, checker.NotNil)
+	c.Assert(strings.TrimSpace(out), checker.Equals, fmt.Sprintf("%s\n%s", container2, container1))
+}