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vars_env_arg.go
52 lines (38 loc) · 1018 Bytes
/
vars_env_arg.go
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package template
import (
"os"
"strings"
bosherr "github.com/cloudfoundry/bosh-utils/errors"
"gopkg.in/yaml.v2"
)
type VarsEnvArg struct {
Vars StaticVariables
EnvironFunc func() []string
}
func (a *VarsEnvArg) UnmarshalFlag(prefix string) error {
if len(prefix) == 0 {
return bosherr.Errorf("Expected environment variable prefix to be non-empty")
}
if a.EnvironFunc == nil {
a.EnvironFunc = os.Environ
}
vars := StaticVariables{}
envVars := a.EnvironFunc()
for _, envVar := range envVars {
pieces := strings.SplitN(envVar, "=", 2)
if len(pieces) != 2 {
return bosherr.Error("Expected environment variable to be key-value pair")
}
if !strings.HasPrefix(pieces[0], prefix+"_") {
continue
}
var val interface{}
err := yaml.Unmarshal([]byte(pieces[1]), &val)
if err != nil {
return bosherr.WrapErrorf(err, "Deserializing YAML from environment variable '%s'", pieces[0])
}
vars[strings.TrimPrefix(pieces[0], prefix+"_")] = val
}
(*a).Vars = vars
return nil
}