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Add CLI command to generate k8s manifests (jaegertracing#1046)
* Add CLI command jaeger-operator generate to generate manifests Defaults to stdin/stdout Examples: jaeger-operator generate --jaeger-all-in-one-image localimage --cr ./deploy/examples/all-in-one-with-options.yaml | kubectl apply -f - cat jaeger.yaml | podman run jaeger-operator generate > manifest.yaml Fixes jaegertracing#375 Signed-off-by: Carl Henrik Lunde <[email protected]> * Add missing TypeMeta for corev1.ServiceAccount Signed-off-by: Carl Henrik Lunde <[email protected]> * Add e2e tests for `jaeger-operator generate` Signed-off-by: Carl Henrik Lunde <[email protected]> * Avoid command line flag duplication Signed-off-by: Carl Henrik Lunde <[email protected]> * Fixup - allow EOF on stdin Signed-off-by: Carl Henrik Lunde <[email protected]> * README: Explain generate subcommand Signed-off-by: Carl Henrik Lunde <[email protected]> * Generate command description: update Signed-off-by: Carl Henrik Lunde <[email protected]> * Strategy: Test that All includes all types Signed-off-by: Carl Henrik Lunde <[email protected]> * Remove solved TODOs Signed-off-by: Carl Henrik Lunde <[email protected]> * Use AllInOneSmokeTest for e2e CLI generate Signed-off-by: Carl Henrik Lunde <[email protected]> * Fix tag name in README Signed-off-by: Carl Henrik Lunde <[email protected]> * Update docs Signed-off-by: Carl Henrik Lunde <[email protected]> * Use require.No* for better error message in e2e test Signed-off-by: Carl Henrik Lunde <[email protected]> * Update docs, mark as experimental Signed-off-by: Carl Henrik Lunde <[email protected]> * Minor refactor/cleanup Signed-off-by: Carl Henrik Lunde <[email protected]> Co-authored-by: Carl Henrik Lunde <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| package generate | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "os" | ||
|
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| log "github.com/sirupsen/logrus" | ||
| "github.com/spf13/cobra" | ||
| "github.com/spf13/viper" | ||
|
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| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| k8s_json "k8s.io/apimachinery/pkg/runtime/serializer/json" | ||
| "k8s.io/apimachinery/pkg/util/yaml" | ||
|
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| v1 "github.com/jaegertracing/jaeger-operator/pkg/apis/jaegertracing/v1" | ||
| "github.com/jaegertracing/jaeger-operator/pkg/cmd/start" | ||
| "github.com/jaegertracing/jaeger-operator/pkg/strategy" | ||
| ) | ||
|
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| // NewGenerateCommand starts the Jaeger Operator | ||
| func NewGenerateCommand() *cobra.Command { | ||
| cmd := &cobra.Command{ | ||
| Use: "generate", | ||
| Short: "(experimental) Generate YAML manifests from Jaeger CRD", | ||
| Long: `Generate YAML manifests from Jaeger CRD. | ||
| Defaults to reading Jaeger CRD from standard input and writing the manifest file to standard output, override with --cr <filename> and --output <filename>.`, | ||
| RunE: generate, | ||
| } | ||
|
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| cmd.Flags().String("cr", "/dev/stdin", "Input Jaeger CRD") | ||
| viper.BindPFlag("cr", cmd.Flags().Lookup("cr")) | ||
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| cmd.Flags().String("output", "/dev/stdout", "Where to print the generated YAML documents") | ||
| viper.BindPFlag("output", cmd.Flags().Lookup("output")) | ||
|
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| start.AddFlags(cmd) | ||
|
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| return cmd | ||
| } | ||
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| func createSpecFromYAML(filename string) (*v1.Jaeger, error) { | ||
| // #nosec G304: Potential file inclusion via variable | ||
| f, err := os.Open(filename) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer f.Close() | ||
|
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| var spec v1.Jaeger | ||
| decoder := yaml.NewYAMLOrJSONDecoder(f, 8192) | ||
| if err := decoder.Decode(&spec); err != nil && err != io.EOF { | ||
| return nil, err | ||
| } | ||
|
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| return &spec, nil | ||
| } | ||
|
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| func generate(_ *cobra.Command, _ []string) error { | ||
| level, err := log.ParseLevel(viper.GetString("log-level")) | ||
| if err != nil { | ||
| log.SetLevel(log.InfoLevel) | ||
| } else { | ||
| log.SetLevel(level) | ||
| } | ||
|
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| input := viper.GetString("cr") | ||
| if input == "/dev/stdin" { | ||
| // Reading from stdin by default is neat when running as a | ||
| // container instead of a binary, but is confusing when no | ||
| // input is sent and the program just hangs | ||
| log.Info("Reading Jaeger CRD from standard input (use --cr <filename> to override)") | ||
| } | ||
|
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| spec, err := createSpecFromYAML(input) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| s := strategy.For(context.Background(), spec) | ||
|
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| outputName := viper.GetString("output") | ||
| out, err := os.OpenFile(outputName, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0600) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| defer out.Close() | ||
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| encoder := k8s_json.NewYAMLSerializer(k8s_json.DefaultMetaFactory, nil, nil) | ||
| for _, obj := range s.All() { | ||
| // OwnerReferences normally references the CR, but it is not a | ||
| // resource in the cluster so we must remove it | ||
|
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| type f interface { | ||
| SetOwnerReferences(references []metav1.OwnerReference) | ||
| } | ||
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| meta := obj.(f) | ||
| meta.SetOwnerReferences(nil) | ||
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| fmt.Fprintln(out, "---") | ||
| if err := encoder.Encode(obj, out); err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| } | ||
|
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||
| return nil | ||
| } |
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