diff --git a/cli-plugins/manager/hooks.go b/cli-plugins/manager/hooks.go index 4d99e679b0..2e138b06d6 100644 --- a/cli-plugins/manager/hooks.go +++ b/cli-plugins/manager/hooks.go @@ -6,6 +6,7 @@ import ( "github.com/docker/cli/cli-plugins/hooks" "github.com/docker/cli/cli/command" + "github.com/sirupsen/logrus" "github.com/spf13/cobra" "github.com/spf13/pflag" ) @@ -92,11 +93,35 @@ func invokeAndCollectHooks(dockerCli command.Cli, rootCmd, subCmd *cobra.Command if err != nil { continue } - nextSteps = append(nextSteps, processedHook...) + + var appended bool + nextSteps, appended = appendNextSteps(nextSteps, processedHook) + if !appended { + logrus.Debugf("Plugin %s responded with an empty hook message %q. Ignoring.", pluginName, string(hookReturn)) + } } return nextSteps } +// appendNextSteps appends the processed hook output to the nextSteps slice. +// If the processed hook output is empty, it is not appended. +// Empty lines are not stripped if there's at least one non-empty line. +func appendNextSteps(nextSteps []string, processed []string) ([]string, bool) { + empty := true + for _, l := range processed { + if strings.TrimSpace(l) != "" { + empty = false + break + } + } + + if empty { + return nextSteps, false + } + + return append(nextSteps, processed...), true +} + // pluginMatch takes a plugin configuration and a string representing the // command being executed (such as 'image ls' – the root 'docker' is omitted) // and, if the configuration includes a hook for the invoked command, returns diff --git a/cli-plugins/manager/hooks_test.go b/cli-plugins/manager/hooks_test.go index c532702f7b..3060a2e9f1 100644 --- a/cli-plugins/manager/hooks_test.go +++ b/cli-plugins/manager/hooks_test.go @@ -4,6 +4,7 @@ import ( "testing" "gotest.tools/v3/assert" + is "gotest.tools/v3/assert/cmp" ) func TestGetNaiveFlags(t *testing.T) { @@ -108,3 +109,35 @@ func TestPluginMatch(t *testing.T) { assert.Equal(t, match, tc.expectedMatch) } } + +func TestAppendNextSteps(t *testing.T) { + testCases := []struct { + processed []string + expectedOut []string + }{ + { + processed: []string{}, + expectedOut: []string{}, + }, + { + processed: []string{"", ""}, + expectedOut: []string{}, + }, + { + processed: []string{"Some hint", "", "Some other hint"}, + expectedOut: []string{"Some hint", "", "Some other hint"}, + }, + { + processed: []string{"Hint 1", "Hint 2"}, + expectedOut: []string{"Hint 1", "Hint 2"}, + }, + } + + for _, tc := range testCases { + t.Run("", func(t *testing.T) { + got, appended := appendNextSteps([]string{}, tc.processed) + assert.Check(t, is.DeepEqual(got, tc.expectedOut)) + assert.Check(t, is.Equal(appended, len(got) > 0)) + }) + } +}