Merge pull request #1225 from thaJeztah/told_you_so_I_wont_warn_you_again

Use warnings provided by daemon

cli/command/system/info.go

@@ -206,45 +206,7 @@ func prettyPrintInfo(dockerCli command.Cli, info types.Info) error {
 	fmt.Fprintln(dockerCli.Out(), "Live Restore Enabled:", info.LiveRestoreEnabled)
 	fmt.Fprint(dockerCli.Out(), "\n")
 
-	// Only output these warnings if the server does not support these features
-	if info.OSType != "windows" {
-		printStorageDriverWarnings(dockerCli, info)
-
-		if !info.MemoryLimit {
-			fmt.Fprintln(dockerCli.Err(), "WARNING: No memory limit support")
-		}
-		if !info.SwapLimit {
-			fmt.Fprintln(dockerCli.Err(), "WARNING: No swap limit support")
-		}
-		if !info.KernelMemory {
-			fmt.Fprintln(dockerCli.Err(), "WARNING: No kernel memory limit support")
-		}
-		if !info.OomKillDisable {
-			fmt.Fprintln(dockerCli.Err(), "WARNING: No oom kill disable support")
-		}
-		if !info.CPUCfsQuota {
-			fmt.Fprintln(dockerCli.Err(), "WARNING: No cpu cfs quota support")
-		}
-		if !info.CPUCfsPeriod {
-			fmt.Fprintln(dockerCli.Err(), "WARNING: No cpu cfs period support")
-		}
-		if !info.CPUShares {
-			fmt.Fprintln(dockerCli.Err(), "WARNING: No cpu shares support")
-		}
-		if !info.CPUSet {
-			fmt.Fprintln(dockerCli.Err(), "WARNING: No cpuset support")
-		}
-		if !info.IPv4Forwarding {
-			fmt.Fprintln(dockerCli.Err(), "WARNING: IPv4 forwarding is disabled")
-		}
-		if !info.BridgeNfIptables {
-			fmt.Fprintln(dockerCli.Err(), "WARNING: bridge-nf-call-iptables is disabled")
-		}
-		if !info.BridgeNfIP6tables {
-			fmt.Fprintln(dockerCli.Err(), "WARNING: bridge-nf-call-ip6tables is disabled")
-		}
-	}
-
+	printWarnings(dockerCli, info)
 	return nil
 }
 
@@ -315,11 +277,73 @@ func printSwarmInfo(dockerCli command.Cli, info types.Info) {
 	}
 }
 
+func printWarnings(dockerCli command.Cli, info types.Info) {
+	if len(info.Warnings) > 0 {
+		fmt.Fprintln(dockerCli.Err(), strings.Join(info.Warnings, "\n"))
+		return
+	}
+	// daemon didn't return warnings. Fallback to old behavior
+	printStorageDriverWarnings(dockerCli, info)
+	printWarningsLegacy(dockerCli, info)
+}
+
+// printWarningsLegacy generates warnings based on information returned by the daemon.
+// DEPRECATED: warnings are now generated by the daemon, and returned in
+// info.Warnings. This function is used to provide backward compatibility with
+// daemons that do not provide these warnings. No new warnings should be added
+// here.
+func printWarningsLegacy(dockerCli command.Cli, info types.Info) {
+	if info.OSType == "windows" {
+		return
+	}
+	if !info.MemoryLimit {
+		fmt.Fprintln(dockerCli.Err(), "WARNING: No memory limit support")
+	}
+	if !info.SwapLimit {
+		fmt.Fprintln(dockerCli.Err(), "WARNING: No swap limit support")
+	}
+	if !info.KernelMemory {
+		fmt.Fprintln(dockerCli.Err(), "WARNING: No kernel memory limit support")
+	}
+	if !info.OomKillDisable {
+		fmt.Fprintln(dockerCli.Err(), "WARNING: No oom kill disable support")
+	}
+	if !info.CPUCfsQuota {
+		fmt.Fprintln(dockerCli.Err(), "WARNING: No cpu cfs quota support")
+	}
+	if !info.CPUCfsPeriod {
+		fmt.Fprintln(dockerCli.Err(), "WARNING: No cpu cfs period support")
+	}
+	if !info.CPUShares {
+		fmt.Fprintln(dockerCli.Err(), "WARNING: No cpu shares support")
+	}
+	if !info.CPUSet {
+		fmt.Fprintln(dockerCli.Err(), "WARNING: No cpuset support")
+	}
+	if !info.IPv4Forwarding {
+		fmt.Fprintln(dockerCli.Err(), "WARNING: IPv4 forwarding is disabled")
+	}
+	if !info.BridgeNfIptables {
+		fmt.Fprintln(dockerCli.Err(), "WARNING: bridge-nf-call-iptables is disabled")
+	}
+	if !info.BridgeNfIP6tables {
+		fmt.Fprintln(dockerCli.Err(), "WARNING: bridge-nf-call-ip6tables is disabled")
+	}
+}
+
+// printStorageDriverWarnings generates warnings based on storage-driver information
+// returned by the daemon.
+// DEPRECATED: warnings are now generated by the daemon, and returned in
+// info.Warnings. This function is used to provide backward compatibility with
+// daemons that do not provide these warnings. No new warnings should be added
+// here.
 func printStorageDriverWarnings(dockerCli command.Cli, info types.Info) {
+	if info.OSType == "windows" {
+		return
+	}
 	if info.DriverStatus == nil {
 		return
 	}
-
 	for _, pair := range info.DriverStatus {
 		if pair[0] == "Data loop file" {
 			fmt.Fprintf(dockerCli.Err(), "WARNING: %s: usage of loopback devices is "+

cli/command/system/info_test.go

@@ -207,25 +207,51 @@ func TestPrettyPrintInfo(t *testing.T) {
 	infoWithWarningsLinux.BridgeNfIptables = false
 	infoWithWarningsLinux.BridgeNfIP6tables = false
 
+	sampleInfoDaemonWarnings := sampleInfoNoSwarm
+	sampleInfoDaemonWarnings.Warnings = []string{
+		"WARNING: No memory limit support",
+		"WARNING: No swap limit support",
+		"WARNING: No kernel memory limit support",
+		"WARNING: No oom kill disable support",
+		"WARNING: No cpu cfs quota support",
+		"WARNING: No cpu cfs period support",
+		"WARNING: No cpu shares support",
+		"WARNING: No cpuset support",
+		"WARNING: IPv4 forwarding is disabled",
+		"WARNING: bridge-nf-call-iptables is disabled",
+		"WARNING: bridge-nf-call-ip6tables is disabled",
+	}
+
 	for _, tc := range []struct {
+		doc            string
 		dockerInfo     types.Info
 		expectedGolden string
 		warningsGolden string
 	}{
 		{
+			doc:            "info without swarm",
 			dockerInfo:     sampleInfoNoSwarm,
 			expectedGolden: "docker-info-no-swarm",
 		},
 		{
+			doc:            "info with swarm",
 			dockerInfo:     infoWithSwarm,
 			expectedGolden: "docker-info-with-swarm",
 		},
 		{
+			doc:            "info with legacy warnings",
 			dockerInfo:     infoWithWarningsLinux,
 			expectedGolden: "docker-info-no-swarm",
 			warningsGolden: "docker-info-warnings",
 		},
+		{
+			doc:            "info with daemon warnings",
+			dockerInfo:     sampleInfoDaemonWarnings,
+			expectedGolden: "docker-info-no-swarm",
+			warningsGolden: "docker-info-warnings",
+		},
 	} {
+		t.Run(tc.doc, func(t *testing.T) {
 			cli := test.NewFakeCli(&fakeClient{})
 			assert.NilError(t, prettyPrintInfo(cli, tc.dockerInfo))
 			golden.Assert(t, cli.OutBuffer().String(), tc.expectedGolden+".golden")
@@ -234,5 +260,6 @@ func TestPrettyPrintInfo(t *testing.T) {
 			} else {
 				assert.Check(t, is.Equal("", cli.ErrBuffer().String()))
 			}
+		})
 	}
 }

vendor.conf

@@ -12,7 +12,7 @@ github.com/cpuguy83/go-md2man v1.0.8
 github.com/davecgh/go-spew 346938d642f2ec3594ed81d874461961cd0faa76 # v1.1.0
 github.com/dgrijalva/jwt-go a2c85815a77d0f951e33ba4db5ae93629a1530af
 github.com/docker/distribution 83389a148052d74ac602f5f1d62f86ff2f3c4aa5
-github.com/docker/docker 1800883bd16664846db1572b8c8fbe8c85892cee
+github.com/docker/docker 2629fe93266e82751af4f1c7568e21060f065b73
 github.com/docker/docker-credential-helpers 5241b46610f2491efdf9d1c85f1ddf5b02f6d962
 # the docker/go package contains a customized version of canonical/json
 # and is used by Notary. The package is periodically rebased on current Go versions.

vendor/github.com/docker/docker/api/types/types.go

@@ -206,6 +206,7 @@ type Info struct {
 	InitCommit         Commit
 	SecurityOptions    []string
 	ProductLicense     string `json:",omitempty"`
+	Warnings           []string
 }
 
 // KeyValue holds a key/value pair