modernize code with slices and maps packages

cli-plugins/manager/cobra_test.go

@@ -3,6 +3,7 @@ package manager
 import (
 	"os"
 	"path/filepath"
+	"slices"
 	"sync"
 	"testing"
 
@@ -45,7 +46,7 @@ func TestPluginStubCompletionRestoresOSArgs(t *testing.T) {
 	t.Cleanup(func() { os.Args = savedArgs })
 
 	originalArgs := []string{"docker", "image", "ls"}
-	os.Args = append([]string(nil), originalArgs...)
+	os.Args = slices.Clone(originalArgs)
 
 	_, directive := cmd.ValidArgsFunction(cmd, []string{"--all"}, "alp")
 	assert.Equal(t, directive, cobra.ShellCompDirectiveError)

cli/command/completion/functions_test.go

@@ -3,9 +3,9 @@ package completion
 import (
 	"context"
 	"errors"
-	"sort"
 	"testing"
 
+	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/moby/moby/api/types/container"
 	"github.com/moby/moby/api/types/image"
 	"github.com/moby/moby/api/types/network"
@@ -177,9 +177,10 @@ func TestCompleteEnvVarNames(t *testing.T) {
 	values, directives := EnvVarNames()(nil, nil, "")
 	assert.Check(t, is.Equal(directives&cobra.ShellCompDirectiveNoFileComp, cobra.ShellCompDirectiveNoFileComp), "Should not perform file completion")
 
-	sort.Strings(values)
 	expected := []string{"ENV_A", "ENV_B"}
-	assert.Check(t, is.DeepEqual(values, expected))
+	assert.Check(t, is.DeepEqual(values, expected, cmpopts.SortSlices(func(a, b string) bool {
+		return a < b
+	})))
 }
 
 func TestCompleteFileNames(t *testing.T) {

cli/command/container/create_test.go

@@ -7,14 +7,14 @@ import (
 	"os"
 	"path/filepath"
 	"runtime"
-	"sort"
 	"strings"
 	"testing"
 
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/config/configfile"
 	"github.com/docker/cli/internal/test"
 	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/moby/moby/api/types/container"
 	"github.com/moby/moby/api/types/system"
 	"github.com/moby/moby/client"
@@ -284,12 +284,12 @@ func TestCreateContainerWithProxyConfig(t *testing.T) {
 		"ALL_PROXY=allProxy",
 		"all_proxy=allProxy",
 	}
-	sort.Strings(expected)
 
 	fakeCLI := test.NewFakeCli(&fakeClient{
 		createContainerFunc: func(options client.ContainerCreateOptions) (client.ContainerCreateResult, error) {
-			sort.Strings(options.Config.Env)
-			assert.DeepEqual(t, options.Config.Env, expected)
+			assert.DeepEqual(t, options.Config.Env, expected, cmpopts.SortSlices(func(a, b string) bool {
+				return a < b
+			}))
 			return client.ContainerCreateResult{}, nil
 		},
 	})

cli/command/container/restart_test.go

@@ -4,11 +4,11 @@ import (
 	"context"
 	"errors"
 	"io"
-	"sort"
 	"sync"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
+	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/moby/moby/client"
 	"gotest.tools/v3/assert"
 	is "gotest.tools/v3/assert/cmp"
@@ -87,8 +87,9 @@ func TestRestart(t *testing.T) {
 			} else {
 				assert.Check(t, is.Nil(err))
 			}
-			sort.Strings(restarted)
-			assert.Check(t, is.DeepEqual(restarted, tc.restarted))
+			assert.Check(t, is.DeepEqual(restarted, tc.restarted, cmpopts.SortSlices(func(a, b string) bool {
+				return a < b
+			})))
 		})
 	}
 }

cli/command/container/rm_test.go

@@ -4,11 +4,11 @@ import (
 	"context"
 	"errors"
 	"io"
-	"sort"
 	"sync"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
+	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/moby/moby/client"
 	"gotest.tools/v3/assert"
 )
@@ -53,8 +53,10 @@ func TestRemoveForce(t *testing.T) {
 				assert.NilError(t, err)
 			}
 			assert.Equal(t, cli.ErrBuffer().String(), "")
-			sort.Strings(removed)
-			assert.DeepEqual(t, removed, []string{"mycontainer", "nosuchcontainer"})
+			expected := []string{"mycontainer", "nosuchcontainer"}
+			assert.DeepEqual(t, removed, expected, cmpopts.SortSlices(func(a, b string) bool {
+				return a < b
+			}))
 		})
 	}
 }

cli/command/container/stop_test.go

@@ -4,11 +4,11 @@ import (
 	"context"
 	"errors"
 	"io"
-	"sort"
 	"sync"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
+	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/moby/moby/client"
 	"gotest.tools/v3/assert"
 	is "gotest.tools/v3/assert/cmp"
@@ -88,8 +88,9 @@ func TestStop(t *testing.T) {
 			} else {
 				assert.Check(t, is.Nil(err))
 			}
-			sort.Strings(stopped)
-			assert.Check(t, is.DeepEqual(stopped, tc.stopped))
+			assert.Check(t, is.DeepEqual(stopped, tc.stopped, cmpopts.SortSlices(func(a, b string) bool {
+				return a < b
+			})))
 		})
 	}
 }

cli/command/formatter/buildcache.go

@@ -1,7 +1,10 @@
+// FIXME(thaJeztah): remove once we are a module; the go:build directive prevents go from downgrading language version to go1.16:
+//go:build go1.26
+
 package formatter
 
 import (
-	"sort"
+	"slices"
 	"strconv"
 	"strings"
 	"time"
@@ -52,20 +55,20 @@ shared: {{.Shared}}
 }
 
 func buildCacheSort(buildCache []build.CacheRecord) {
-	sort.Slice(buildCache, func(i, j int) bool {
-		lui, luj := buildCache[i].LastUsedAt, buildCache[j].LastUsedAt
+	slices.SortFunc(buildCache, func(a, b build.CacheRecord) int {
 		switch {
-		case lui == nil && luj == nil:
-			return strings.Compare(buildCache[i].ID, buildCache[j].ID) < 0
-		case lui == nil:
-			return true
-		case luj == nil:
-			return false
-		case lui.Equal(*luj):
-			return strings.Compare(buildCache[i].ID, buildCache[j].ID) < 0
-		default:
-			return lui.Before(*luj)
+		case a.LastUsedAt == nil && b.LastUsedAt == nil:
+			return strings.Compare(a.ID, b.ID)
+		case a.LastUsedAt == nil:
+			return -1
+		case b.LastUsedAt == nil:
+			return 1
+		}
+
+		if c := a.LastUsedAt.Compare(*b.LastUsedAt); c != 0 {
+			return c
 		}
+		return strings.Compare(a.ID, b.ID)
 	})
 }
 

cli/command/formatter/container.go

@@ -4,9 +4,10 @@
 package formatter
 
 import (
+	"cmp"
 	"fmt"
 	"net"
-	"sort"
+	"slices"
 	"strconv"
 	"strings"
 	"time"
@@ -295,7 +296,7 @@ func (c *ContainerContext) Labels() string {
 	for k, v := range c.c.Labels {
 		joinLabels = append(joinLabels, k+"="+v)
 	}
-	sort.Strings(joinLabels)
+	slices.Sort(joinLabels)
 	return strings.Join(joinLabels, ",")
 }
 
@@ -395,9 +396,7 @@ func DisplayablePorts(ports []container.PortSummary) string {
 	var result []string
 	var hostMappings []string
 	var groupMapKeys []string
-	sort.Slice(ports, func(i, j int) bool {
-		return comparePorts(ports[i], ports[j])
-	})
+	slices.SortFunc(ports, comparePorts)
 
 	for _, port := range ports {
 		current := port.PrivatePort
@@ -452,18 +451,13 @@ func formGroup(key string, start, last uint16) string {
 	return group + "/" + groupType
 }
 
-func comparePorts(i, j container.PortSummary) bool {
-	if i.PrivatePort != j.PrivatePort {
-		return i.PrivatePort < j.PrivatePort
-	}
-
-	if i.IP != j.IP {
-		return i.IP.Less(j.IP)
-	}
-
-	if i.PublicPort != j.PublicPort {
-		return i.PublicPort < j.PublicPort
-	}
-
-	return i.Type < j.Type
+// comparePorts compares ports by private port, IP address, public port,
+// and protocol, in that order.
+func comparePorts(a, b container.PortSummary) int {
+	return cmp.Or(
+		cmp.Compare(a.PrivatePort, b.PrivatePort),
+		a.IP.Compare(b.IP),
+		cmp.Compare(a.PublicPort, b.PublicPort),
+		cmp.Compare(a.Type, b.Type),
+	)
 }

cli/command/image/build/internal/git/gitutils.go

@@ -1,3 +1,6 @@
+// FIXME(thaJeztah): remove once we are a module; the go:build directive prevents go from downgrading language version to go1.16:
+//go:build go1.26
+
 package git
 
 import (
@@ -7,6 +10,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"slices"
 	"strings"
 
 	"github.com/moby/sys/symlink"
@@ -202,7 +206,7 @@ func (repo gitRepo) checkout(root string) (string, error) {
 }
 
 func (repo gitRepo) gitWithinDir(dir string, args ...string) ([]byte, error) {
-	args = append([]string{"-c", "protocol.file.allow=never"}, args...) // Block sneaky repositories from using repos from the filesystem as submodules.
+	args = slices.Concat([]string{"-c", "protocol.file.allow=never"}, args) // Block sneaky repositories from using repos from the filesystem as submodules.
 	cmd := exec.Command("git", args...)
 	cmd.Dir = dir
 	// Disable unsafe remote protocols.

cli/command/image/build_test.go

@@ -8,7 +8,7 @@ import (
 	"io"
 	"os"
 	"path/filepath"
-	"sort"
+	"slices"
 	"testing"
 
 	"github.com/docker/cli/cli/streams"
@@ -211,6 +211,6 @@ func (f *fakeBuild) filenames(t *testing.T) []string {
 	for _, header := range h {
 		names = append(names, header.Name)
 	}
-	sort.Strings(names)
+	slices.Sort(names)
 	return names
 }

cli/command/image/push_test.go

@@ -102,9 +102,11 @@ func TestRunPushRespectsNoColorForAuxNotes(t *testing.T) {
 				SelectedManifest:             ocispec.Descriptor{Digest: "sha256:2222222222222222222222222222222222222222222222222222222222222222"},
 			})
 			assert.NilError(t, err)
-			line := append([]byte(`{"aux":`), aux...)
-			line = append(line, '}', '\n')
-			return fakeStreamResult{ReadCloser: io.NopCloser(bytes.NewReader(line))}, nil
+			var buf bytes.Buffer
+			buf.WriteString(`{"aux":`)
+			buf.Write(aux)
+			buf.WriteString("}\n")
+			return fakeStreamResult{ReadCloser: io.NopCloser(&buf)}, nil
 		},
 	})
 	cli.Out().SetIsTerminal(true)

cli/command/service/formatter.go

@@ -1,8 +1,13 @@
+// FIXME(thaJeztah): remove once we are a module; the go:build directive prevents go from downgrading language version to go1.16:
+//go:build go1.26
+
 package service
 
 import (
+	"cmp"
 	"errors"
 	"fmt"
+	"slices"
 	"sort"
 	"strconv"
 	"strings"
@@ -775,17 +780,16 @@ func (c *serviceContext) Ports() string {
 		return ""
 	}
 
-	pr := portRange{}
-	ports := []string{}
-
-	servicePorts := c.service.Endpoint.Ports
-	sort.Slice(servicePorts, func(i, j int) bool {
-		if servicePorts[i].Protocol == servicePorts[j].Protocol {
-			return servicePorts[i].PublishedPort < servicePorts[j].PublishedPort
-		}
-		return servicePorts[i].Protocol < servicePorts[j].Protocol
+	// Sort by protocol first, then by published port.
+	slices.SortFunc(c.service.Endpoint.Ports, func(a, b swarm.PortConfig) int {
+		return cmp.Or(
+			cmp.Compare(a.Protocol, b.Protocol),
+			cmp.Compare(a.PublishedPort, b.PublishedPort),
+		)
 	})
 
+	var pr portRange
+	var ports []string
 	for _, p := range c.service.Endpoint.Ports {
 		if p.PublishMode == swarm.PortConfigPublishModeIngress {
 			prIsRange := pr.tEnd != pr.tStart

cli/command/service/logs.go

@@ -1,3 +1,6 @@
+// FIXME(thaJeztah): remove once we are a module; the go:build directive prevents go from downgrading language version to go1.16:
+//go:build go1.26
+
 package service
 
 import (
@@ -6,7 +9,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"sort"
+	"slices"
 	"strconv"
 	"strings"
 
@@ -314,7 +317,7 @@ func (lw *logWriter) Write(buf []byte) (int, error) {
 			d = append(d, k+"="+details[k])
 		}
 		// then sort em
-		sort.Strings(d)
+		slices.Sort(d)
 		// then join and append
 		output = append(output, []byte(strings.Join(d, ","))...)
 		output = append(output, ' ')