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substitution.go
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substitution.go
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/*
* Copyright 2022 The Furiko 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.
*/
package podtaskexecutor
import (
v1 "k8s.io/api/core/v1"
execution "github.com/furiko-io/furiko/apis/execution/v1alpha1"
"github.com/furiko-io/furiko/pkg/core/options"
"github.com/furiko-io/furiko/pkg/execution/variablecontext"
)
type subFunc func(s string) string
// SubstitutePodSpec returns a PodSpec after substituting context variables.
func SubstitutePodSpec(
rj *execution.Job,
podSpec v1.PodSpec,
taskSpec variablecontext.TaskSpec,
) v1.PodSpec {
var subMaps []map[string]string
spec := podSpec.DeepCopy()
// Substitutions specified in the JobSpec takes the highest priority.
if len(rj.Spec.Substitutions) > 0 {
subMaps = append(subMaps, rj.Spec.Substitutions)
}
// Substitute job and task context variables.
subMaps = append(subMaps, variablecontext.ContextProvider.MakeVariablesFromJob(rj))
subMaps = append(subMaps, variablecontext.ContextProvider.MakeVariablesFromTask(taskSpec))
// Get list of all prefixes that were injected, and drop all leftover not
// substituted matches. This is to prevent cases like "Bad substitution" when
// trying to interpret in Bash.
removePrefixes := variablecontext.ContextProvider.GetAllPrefixes()
removePrefixes = append(removePrefixes, "option.")
sub := func(s string) string {
return options.SubstituteVariableMaps(s, subMaps, removePrefixes)
}
return substitutePodSpec(*spec, sub)
}
func substitutePodSpec(spec v1.PodSpec, sub subFunc) v1.PodSpec {
// Substitute init containers.
for i, container := range spec.InitContainers {
spec.InitContainers[i] = substituteContainer(container, sub)
}
// Substitute containers.
for i, container := range spec.Containers {
spec.Containers[i] = substituteContainer(container, sub)
}
return spec
}
func substituteContainer(container v1.Container, sub subFunc) v1.Container {
newContainer := container.DeepCopy()
// Substitute image.
newContainer.Image = sub(newContainer.Image)
// Substitute env vars.
for i, envVar := range newContainer.Env {
newEnvVar := envVar.DeepCopy()
newEnvVar.Value = sub(newEnvVar.Value)
newContainer.Env[i] = *newEnvVar
}
// Substitute command.
for i, cmd := range newContainer.Command {
newContainer.Command[i] = sub(cmd)
}
// Substitute args.
for i, cmd := range newContainer.Args {
newContainer.Args[i] = sub(cmd)
}
return *newContainer
}