From 1c576e90435283451051056bb6987b28212122f3 Mon Sep 17 00:00:00 2001 From: Ian Campbell Date: Wed, 19 Dec 2018 14:49:20 +0000 Subject: [PATCH] Integrate CLI plugins into `docker info` Fairly straight forward. It became necessary to wrap `Plugin.Err` with a type which implements `encoding.MarshalText` in order to have that field rendered properly in the `docker info -f '{{json}}'` output. Since I changed the type somewhat I also added a unit test for `formatInfo`. Signed-off-by: Ian Campbell --- cli-plugins/manager/candidate_test.go | 3 + cli-plugins/manager/error.go | 43 ++++++++++++++ cli-plugins/manager/error_test.go | 24 ++++++++ cli-plugins/manager/metadata.go | 10 ++-- cli-plugins/manager/plugin.go | 23 ++++---- cli/command/system/info.go | 27 ++++++++- cli/command/system/info_test.go | 37 +++++++++++- .../testdata/docker-info-badsec.json.golden | 2 +- .../docker-info-daemon-warnings.json.golden | 2 +- .../docker-info-legacy-warnings.json.golden | 2 +- .../testdata/docker-info-no-swarm.json.golden | 2 +- .../docker-info-plugins-warnings.golden | 1 + .../testdata/docker-info-plugins.golden | 56 +++++++++++++++++++ .../testdata/docker-info-plugins.json.golden | 1 + .../docker-info-with-swarm.json.golden | 2 +- 15 files changed, 210 insertions(+), 25 deletions(-) create mode 100644 cli-plugins/manager/error.go create mode 100644 cli-plugins/manager/error_test.go create mode 100644 cli/command/system/testdata/docker-info-plugins-warnings.golden create mode 100644 cli/command/system/testdata/docker-info-plugins.golden create mode 100644 cli/command/system/testdata/docker-info-plugins.json.golden diff --git a/cli-plugins/manager/candidate_test.go b/cli-plugins/manager/candidate_test.go index 11384226a5..b5ed06453f 100644 --- a/cli-plugins/manager/candidate_test.go +++ b/cli-plugins/manager/candidate_test.go @@ -2,11 +2,13 @@ package manager import ( "fmt" + "reflect" "strings" "testing" "github.com/spf13/cobra" "gotest.tools/assert" + "gotest.tools/assert/cmp" ) type fakeCandidate struct { @@ -73,6 +75,7 @@ func TestValidateCandidate(t *testing.T) { assert.ErrorContains(t, err, tc.err) } else if tc.invalid != "" { assert.NilError(t, err) + assert.Assert(t, cmp.ErrorType(p.Err, reflect.TypeOf(&pluginError{}))) assert.ErrorContains(t, p.Err, tc.invalid) } else { assert.NilError(t, err) diff --git a/cli-plugins/manager/error.go b/cli-plugins/manager/error.go new file mode 100644 index 0000000000..1ad2867869 --- /dev/null +++ b/cli-plugins/manager/error.go @@ -0,0 +1,43 @@ +package manager + +import ( + "github.com/pkg/errors" +) + +// pluginError is set as Plugin.Err by NewPlugin if the plugin +// candidate fails one of the candidate tests. This exists primarily +// to implement encoding.TextMarshaller such that rendering a plugin as JSON +// (e.g. for `docker info -f '{{json .CLIPlugins}}'`) renders the Err +// field as a useful string and not just `{}`. See +// https://github.com/golang/go/issues/10748 for some discussion +// around why the builtin error type doesn't implement this. +type pluginError struct { + cause error +} + +// Error satisfies the core error interface for pluginError. +func (e *pluginError) Error() string { + return e.cause.Error() +} + +// Cause satisfies the errors.causer interface for pluginError. +func (e *pluginError) Cause() error { + return e.cause +} + +// MarshalText marshalls the pluginError into a textual form. +func (e *pluginError) MarshalText() (text []byte, err error) { + return []byte(e.cause.Error()), nil +} + +// wrapAsPluginError wraps an error in a pluginError with an +// additional message, analogous to errors.Wrapf. +func wrapAsPluginError(err error, msg string) error { + return &pluginError{cause: errors.Wrap(err, msg)} +} + +// NewPluginError creates a new pluginError, analogous to +// errors.Errorf. +func NewPluginError(msg string, args ...interface{}) error { + return &pluginError{cause: errors.Errorf(msg, args...)} +} diff --git a/cli-plugins/manager/error_test.go b/cli-plugins/manager/error_test.go new file mode 100644 index 0000000000..04614e24ff --- /dev/null +++ b/cli-plugins/manager/error_test.go @@ -0,0 +1,24 @@ +package manager + +import ( + "fmt" + "testing" + + "github.com/pkg/errors" + "gopkg.in/yaml.v2" + "gotest.tools/assert" +) + +func TestPluginError(t *testing.T) { + err := NewPluginError("new error") + assert.Error(t, err, "new error") + + inner := fmt.Errorf("testing") + err = wrapAsPluginError(inner, "wrapping") + assert.Error(t, err, "wrapping: testing") + assert.Equal(t, inner, errors.Cause(err)) + + actual, err := yaml.Marshal(err) + assert.NilError(t, err) + assert.Equal(t, "'wrapping: testing'\n", string(actual)) +} diff --git a/cli-plugins/manager/metadata.go b/cli-plugins/manager/metadata.go index 2d5734e868..1df3c8e08f 100644 --- a/cli-plugins/manager/metadata.go +++ b/cli-plugins/manager/metadata.go @@ -13,13 +13,13 @@ const ( // Metadata provided by the plugin type Metadata struct { // SchemaVersion describes the version of this struct. Mandatory, must be "0.1.0" - SchemaVersion string + SchemaVersion string `json:",omitempty"` // Vendor is the name of the plugin vendor. Mandatory - Vendor string + Vendor string `json:",omitempty"` // Version is the optional version of this plugin. - Version string + Version string `json:",omitempty"` // ShortDescription should be suitable for a single line help message. - ShortDescription string + ShortDescription string `json:",omitempty"` // URL is a pointer to the plugin's homepage. - URL string + URL string `json:",omitempty"` } diff --git a/cli-plugins/manager/plugin.go b/cli-plugins/manager/plugin.go index cc7e312db8..06a0ba8345 100644 --- a/cli-plugins/manager/plugin.go +++ b/cli-plugins/manager/plugin.go @@ -19,8 +19,8 @@ var ( type Plugin struct { Metadata - Name string - Path string + Name string `json:",omitempty"` + Path string `json:",omitempty"` // Err is non-nil if the plugin failed one of the candidate tests. Err error `json:",omitempty"` @@ -31,8 +31,9 @@ type Plugin struct { // newPlugin determines if the given candidate is valid and returns a // Plugin. If the candidate fails one of the tests then `Plugin.Err` -// is set, but the `Plugin` is still returned with no error. An error -// is only returned due to a non-recoverable error. +// is set, and is always a `pluginError`, but the `Plugin` is still +// returned with no error. An error is only returned due to a +// non-recoverable error. func newPlugin(c Candidate, rootcmd *cobra.Command) (Plugin, error) { path := c.Path() if path == "" { @@ -63,7 +64,7 @@ func newPlugin(c Candidate, rootcmd *cobra.Command) (Plugin, error) { // Now apply the candidate tests, so these update p.Err. if !pluginNameRe.MatchString(p.Name) { - p.Err = errors.Errorf("plugin candidate %q did not match %q", p.Name, pluginNameRe.String()) + p.Err = NewPluginError("plugin candidate %q did not match %q", p.Name, pluginNameRe.String()) return p, nil } @@ -76,11 +77,11 @@ func newPlugin(c Candidate, rootcmd *cobra.Command) (Plugin, error) { continue } if cmd.Name() == p.Name { - p.Err = errors.Errorf("plugin %q duplicates builtin command", p.Name) + p.Err = NewPluginError("plugin %q duplicates builtin command", p.Name) return p, nil } if cmd.HasAlias(p.Name) { - p.Err = errors.Errorf("plugin %q duplicates an alias of builtin command %q", p.Name, cmd.Name()) + p.Err = NewPluginError("plugin %q duplicates an alias of builtin command %q", p.Name, cmd.Name()) return p, nil } } @@ -89,21 +90,21 @@ func newPlugin(c Candidate, rootcmd *cobra.Command) (Plugin, error) { // We are supposed to check for relevant execute permissions here. Instead we rely on an attempt to execute. meta, err := c.Metadata() if err != nil { - p.Err = errors.Wrap(err, "failed to fetch metadata") + p.Err = wrapAsPluginError(err, "failed to fetch metadata") return p, nil } if err := json.Unmarshal(meta, &p.Metadata); err != nil { - p.Err = errors.Wrap(err, "invalid metadata") + p.Err = wrapAsPluginError(err, "invalid metadata") return p, nil } if p.Metadata.SchemaVersion != "0.1.0" { - p.Err = errors.Errorf("plugin SchemaVersion %q is not valid, must be 0.1.0", p.Metadata.SchemaVersion) + p.Err = NewPluginError("plugin SchemaVersion %q is not valid, must be 0.1.0", p.Metadata.SchemaVersion) return p, nil } if p.Metadata.Vendor == "" { - p.Err = errors.Errorf("plugin metadata does not define a vendor") + p.Err = NewPluginError("plugin metadata does not define a vendor") return p, nil } return p, nil diff --git a/cli/command/system/info.go b/cli/command/system/info.go index 29380ea1a3..c86c04993c 100644 --- a/cli/command/system/info.go +++ b/cli/command/system/info.go @@ -8,6 +8,7 @@ import ( "strings" "github.com/docker/cli/cli" + pluginmanager "github.com/docker/cli/cli-plugins/manager" "github.com/docker/cli/cli/command" "github.com/docker/cli/cli/debug" "github.com/docker/cli/templates" @@ -23,6 +24,7 @@ type infoOptions struct { type clientInfo struct { Debug bool + Plugins []pluginmanager.Plugin Warnings []string } @@ -47,7 +49,7 @@ func NewInfoCommand(dockerCli command.Cli) *cobra.Command { Short: "Display system-wide information", Args: cli.NoArgs, RunE: func(cmd *cobra.Command, args []string) error { - return runInfo(dockerCli, &opts) + return runInfo(cmd, dockerCli, &opts) }, } @@ -58,7 +60,7 @@ func NewInfoCommand(dockerCli command.Cli) *cobra.Command { return cmd } -func runInfo(dockerCli command.Cli, opts *infoOptions) error { +func runInfo(cmd *cobra.Command, dockerCli command.Cli, opts *infoOptions) error { var info info ctx := context.Background() @@ -71,6 +73,11 @@ func runInfo(dockerCli command.Cli, opts *infoOptions) error { info.ClientInfo = &clientInfo{ Debug: debug.IsEnabled(), } + if plugins, err := pluginmanager.ListPlugins(dockerCli, cmd.Root()); err == nil { + info.ClientInfo.Plugins = plugins + } else { + info.ClientErrors = append(info.ClientErrors, err.Error()) + } if opts.format == "" { return prettyPrintInfo(dockerCli, info) @@ -109,6 +116,17 @@ func prettyPrintInfo(dockerCli command.Cli, info info) error { func prettyPrintClientInfo(dockerCli command.Cli, info clientInfo) error { fmt.Fprintln(dockerCli.Out(), " Debug Mode:", info.Debug) + if len(info.Plugins) > 0 { + fmt.Fprintln(dockerCli.Out(), " Plugins:") + for _, p := range info.Plugins { + if p.Err == nil { + fmt.Fprintf(dockerCli.Out(), " %s: (%s, %s) %s\n", p.Name, p.Version, p.Vendor, p.ShortDescription) + } else { + info.Warnings = append(info.Warnings, fmt.Sprintf("WARNING: Plugin %q is not valid: %s", p.Path, p.Err)) + } + } + } + if len(info.Warnings) > 0 { fmt.Fprintln(dockerCli.Err(), strings.Join(info.Warnings, "\n")) } @@ -447,6 +465,11 @@ func getBackingFs(info types.Info) string { } func formatInfo(dockerCli command.Cli, info info, format string) error { + // Ensure slice/array fields render as `[]` not `null` + if info.ClientInfo != nil && info.ClientInfo.Plugins == nil { + info.ClientInfo.Plugins = make([]pluginmanager.Plugin, 0) + } + tmpl, err := templates.Parse(format) if err != nil { return cli.StatusError{StatusCode: 64, diff --git a/cli/command/system/info_test.go b/cli/command/system/info_test.go index d3bcd7e02a..cb46715e53 100644 --- a/cli/command/system/info_test.go +++ b/cli/command/system/info_test.go @@ -6,6 +6,7 @@ import ( "testing" "time" + pluginmanager "github.com/docker/cli/cli-plugins/manager" "github.com/docker/cli/internal/test" "github.com/docker/docker/api/types" "github.com/docker/docker/api/types/registry" @@ -192,6 +193,24 @@ PQQDAgNIADBFAiEAo9fTQNM5DP9bHVcTJYfl2Cay1bFu1E+lnpmN+EYJfeACIGKH }, } +var samplePluginsInfo = []pluginmanager.Plugin{ + { + Name: "goodplugin", + Path: "/path/to/docker-goodplugin", + Metadata: pluginmanager.Metadata{ + SchemaVersion: "0.1.0", + ShortDescription: "unit test is good", + Vendor: "ACME Corp", + Version: "0.1.0", + }, + }, + { + Name: "badplugin", + Path: "/path/to/docker-badplugin", + Err: pluginmanager.NewPluginError("something wrong"), + }, +} + func TestPrettyPrintInfo(t *testing.T) { infoWithSwarm := sampleInfoNoSwarm infoWithSwarm.Swarm = sampleSwarmInfo @@ -228,8 +247,9 @@ func TestPrettyPrintInfo(t *testing.T) { sampleInfoBadSecurity.SecurityOptions = []string{"foo="} for _, tc := range []struct { - doc string - dockerInfo info + doc string + dockerInfo info + prettyGolden string warningsGolden string jsonGolden string @@ -245,6 +265,19 @@ func TestPrettyPrintInfo(t *testing.T) { jsonGolden: "docker-info-no-swarm", }, { + doc: "info with plugins", + dockerInfo: info{ + Info: &sampleInfoNoSwarm, + ClientInfo: &clientInfo{ + Plugins: samplePluginsInfo, + }, + }, + prettyGolden: "docker-info-plugins", + jsonGolden: "docker-info-plugins", + warningsGolden: "docker-info-plugins-warnings", + }, + { + doc: "info with swarm", dockerInfo: info{ Info: &infoWithSwarm, diff --git a/cli/command/system/testdata/docker-info-badsec.json.golden b/cli/command/system/testdata/docker-info-badsec.json.golden index 4b15ac0222..3f3eea2393 100644 --- a/cli/command/system/testdata/docker-info-badsec.json.golden +++ b/cli/command/system/testdata/docker-info-badsec.json.golden @@ -1 +1 @@ -{"ID":"EKHL:QDUU:QZ7U:MKGD:VDXK:S27Q:GIPU:24B7:R7VT:DGN6:QCSF:2UBX","Containers":0,"ContainersRunning":0,"ContainersPaused":0,"ContainersStopped":0,"Images":0,"Driver":"aufs","DriverStatus":[["Root Dir","/var/lib/docker/aufs"],["Backing Filesystem","extfs"],["Dirs","0"],["Dirperm1 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error happened"],"ClientInfo":{"Debug":false,"Warnings":null}} +{"ID":"EKHL:QDUU:QZ7U:MKGD:VDXK:S27Q:GIPU:24B7:R7VT:DGN6:QCSF:2UBX","Containers":0,"ContainersRunning":0,"ContainersPaused":0,"ContainersStopped":0,"Images":0,"Driver":"aufs","DriverStatus":[["Root Dir","/var/lib/docker/aufs"],["Backing Filesystem","extfs"],["Dirs","0"],["Dirperm1 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error happened"],"ClientInfo":{"Debug":false,"Plugins":[],"Warnings":null}} diff --git a/cli/command/system/testdata/docker-info-daemon-warnings.json.golden b/cli/command/system/testdata/docker-info-daemon-warnings.json.golden index 504939799d..0a387bb510 100644 --- a/cli/command/system/testdata/docker-info-daemon-warnings.json.golden +++ b/cli/command/system/testdata/docker-info-daemon-warnings.json.golden @@ -1 +1 @@ -{"ID":"EKHL:QDUU:QZ7U:MKGD:VDXK:S27Q:GIPU:24B7:R7VT:DGN6:QCSF:2UBX","Containers":0,"ContainersRunning":0,"ContainersPaused":0,"ContainersStopped":0,"Images":0,"Driver":"aufs","DriverStatus":[["Root Dir","/var/lib/docker/aufs"],["Backing Filesystem","extfs"],["Dirs","0"],["Dirperm1 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