yq/pkg/yqlib/operator_env.go

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package yqlib
import (
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"container/list"
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"fmt"
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"os"
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"strings"
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envsubst "github.com/a8m/envsubst"
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yaml "gopkg.in/yaml.v3"
)
type envOpPreferences struct {
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StringValue bool
}
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func envOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
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envName := expressionNode.Operation.CandidateNode.Node.Value
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log.Debug("EnvOperator, env name:", envName)
rawValue := os.Getenv(envName)
preferences := expressionNode.Operation.Preferences.(envOpPreferences)
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var node *yaml.Node
if preferences.StringValue {
node = &yaml.Node{
Kind: yaml.ScalarNode,
Tag: "!!str",
Value: rawValue,
}
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} else if rawValue == "" {
return Context{}, fmt.Errorf("Value for env variable '%v' not provided in env()", envName)
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} else {
var dataBucket yaml.Node
decoder := yaml.NewDecoder(strings.NewReader(rawValue))
errorReading := decoder.Decode(&dataBucket)
if errorReading != nil {
return Context{}, errorReading
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}
//first node is a doc
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node = unwrapDoc(&dataBucket)
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}
log.Debug("ENV tag", node.Tag)
log.Debug("ENV value", node.Value)
log.Debug("ENV Kind", node.Kind)
target := &CandidateNode{Node: node}
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return context.SingleChildContext(target), nil
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}
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func envsubstOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
var results = list.New()
for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
candidate := el.Value.(*CandidateNode)
node := unwrapDoc(candidate.Node)
if node.Tag != "!!str" {
log.Warning("EnvSubstOperator, env name:", node.Tag, node.Value)
return Context{}, fmt.Errorf("cannot substitute with %v, can only substitute strings. Hint: Most often you'll want to use '|=' over '=' for this operation", node.Tag)
}
value, err := envsubst.String(node.Value)
if err != nil {
return Context{}, err
}
targetNode := &yaml.Node{Kind: yaml.ScalarNode, Value: value, Tag: "!!str"}
result := candidate.CreateReplacement(targetNode)
results.PushBack(result)
}
return context.ChildContext(results), nil
}