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Fix related image environment variable discovery
The related image discovery feature currently only reads environment variables from the manager container. This was causing an error when the deployment labels or container name that was expected were not present. This fixes that by collecting related images from all containers across all deployments. This change also enables users to use related images in other containers since related images from everywhere will be considered.
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151 changes: 151 additions & 0 deletions
151
internal/cmd/operator-sdk/generate/internal/relatedimages.go
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,151 @@ | ||
| // Copyright 2020 The Operator-SDK Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
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| package genutil | ||
|
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||
| import ( | ||
| "fmt" | ||
| "strings" | ||
|
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| operatorsv1alpha1 "github.com/operator-framework/api/pkg/operators/v1alpha1" | ||
| "github.com/operator-framework/operator-sdk/internal/generate/collector" | ||
| log "github.com/sirupsen/logrus" | ||
| corev1 "k8s.io/api/core/v1" | ||
| "k8s.io/apimachinery/pkg/util/sets" | ||
| ) | ||
|
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| // FindRelatedImages looks in the controller manager's environment for images used by the operator. | ||
| func FindRelatedImages(manifestCol *collector.Manifests) ([]operatorsv1alpha1.RelatedImage, error) { | ||
| col := relatedImageCollector{ | ||
| relatedImages: []*relatedImage{}, | ||
| relatedImagesByName: make(map[string][]*relatedImage), | ||
| relatedImagesByImageRef: make(map[string][]*relatedImage), | ||
| seenRelatedImages: sets.NewString(), | ||
| } | ||
|
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| for _, deployment := range manifestCol.Deployments { | ||
| containers := deployment.Spec.Template.Spec.Containers | ||
| for _, container := range containers { | ||
| // containerRef can just be the deployment if there's only one container | ||
| // otherwise we need {{ deployment.Name }}-{{ container.Name }} | ||
| containerRef := deployment.Name | ||
| if len(containers) > 1 { | ||
| containerRef += "-" + container.Name | ||
| } | ||
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| if err := col.collectFromEnvironment(containerRef, container.Env); err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| } | ||
|
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| return col.collectedRelatedImages(), nil | ||
| } | ||
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| const relatedImagePrefix = "RELATED_IMAGE_" | ||
|
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| type relatedImage struct { | ||
| name string | ||
| imageRef string | ||
| containerRef string // If 1 container then {{deployment}} else {{deployment}}-{{container}} | ||
| } | ||
|
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| type relatedImageCollector struct { | ||
| relatedImages []*relatedImage | ||
| relatedImagesByName map[string][]*relatedImage | ||
| relatedImagesByImageRef map[string][]*relatedImage | ||
| seenRelatedImages sets.String | ||
| } | ||
|
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| func (c *relatedImageCollector) collectFromEnvironment(containerRef string, env []corev1.EnvVar) error { | ||
| for _, envVar := range env { | ||
| if strings.HasPrefix(envVar.Name, relatedImagePrefix) { | ||
| if envVar.ValueFrom != nil { | ||
| return fmt.Errorf("related images with valueFrom field unsupported, found in %s`", envVar.Name) | ||
| } | ||
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| name := c.formatName(envVar.Name) | ||
| c.collect(name, envVar.Value, containerRef) | ||
| } | ||
| } | ||
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| return nil | ||
| } | ||
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| func (c *relatedImageCollector) collect(name, imageRef, containerRef string) { | ||
| // Don't add exact duplicates (same name and image) | ||
| key := name + "-" + imageRef | ||
| if c.seenRelatedImages.Has(key) { | ||
| return | ||
| } | ||
| c.seenRelatedImages.Insert(key) | ||
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| relatedImg := relatedImage{ | ||
| name: name, | ||
| imageRef: imageRef, | ||
| containerRef: containerRef, | ||
| } | ||
|
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| c.relatedImages = append(c.relatedImages, &relatedImg) | ||
| if relatedImages, ok := c.relatedImagesByName[name]; ok { | ||
| c.relatedImagesByName[name] = append(relatedImages, &relatedImg) | ||
| } else { | ||
| c.relatedImagesByName[name] = []*relatedImage{&relatedImg} | ||
| } | ||
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| if relatedImages, ok := c.relatedImagesByImageRef[imageRef]; ok { | ||
| c.relatedImagesByImageRef[imageRef] = append(relatedImages, &relatedImg) | ||
| } else { | ||
| c.relatedImagesByImageRef[imageRef] = []*relatedImage{&relatedImg} | ||
| } | ||
| } | ||
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| func (c *relatedImageCollector) collectedRelatedImages() []operatorsv1alpha1.RelatedImage { | ||
| final := make([]operatorsv1alpha1.RelatedImage, 0, len(c.relatedImages)) | ||
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| for _, relatedImage := range c.relatedImages { | ||
| name := relatedImage.name | ||
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| // Prefix the name with the containerRef on name collisions. | ||
| if len(c.relatedImagesByName[relatedImage.name]) > 1 { | ||
| name = relatedImage.containerRef + "-" + name | ||
| } | ||
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| // Only add the related image to the final list if its the first occurrence of an image. | ||
| // Blank out the name since the image is used multiple times and warn the user. | ||
| // Multiple containers using she same related image should use the same exact name. | ||
| if relatedImages := c.relatedImagesByImageRef[relatedImage.imageRef]; len(relatedImages) > 1 { | ||
| if relatedImages[0].name != relatedImage.name { | ||
| continue | ||
| } | ||
|
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| name = "" | ||
| log.Warnf( | ||
| "warning: multiple related images with the same image ref, %q, and different names found."+ | ||
| "The image will only be listed once with an empty name."+ | ||
| "It is recmmended to either remove the duplicate or use the exact same name.", | ||
| relatedImage.name, | ||
| ) | ||
| } | ||
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| final = append(final, operatorsv1alpha1.RelatedImage{Name: name, Image: relatedImage.imageRef}) | ||
| } | ||
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| return final | ||
| } | ||
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| // formatName transforms RELATED_IMAGE_This_IS_a_cool_image to this-is-a-cool-image | ||
| func (c *relatedImageCollector) formatName(name string) string { | ||
| return strings.ToLower(strings.Replace(strings.TrimPrefix(name, relatedImagePrefix), "_", "-", -1)) | ||
| } |
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