110 lines
2.6 KiB
Go
110 lines
2.6 KiB
Go
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package yaml
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import (
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"fmt"
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"strconv"
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"strings"
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)
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// Build represents a build element in compose file.
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// It can take multiple form in the compose file, hence this special type
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type Build struct {
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Context string
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Dockerfile string
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Args map[string]string
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}
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// MarshalYAML implements the Marshaller interface.
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func (b Build) MarshalYAML() (tag string, value interface{}, err error) {
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m := map[string]interface{}{}
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if b.Context != "" {
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m["context"] = b.Context
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}
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if b.Dockerfile != "" {
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m["dockerfile"] = b.Dockerfile
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}
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if len(b.Args) > 0 {
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m["args"] = b.Args
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}
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return "", m, nil
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}
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// UnmarshalYAML implements the Unmarshaller interface.
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func (b *Build) UnmarshalYAML(tag string, value interface{}) error {
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switch v := value.(type) {
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case string:
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b.Context = v
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case map[interface{}]interface{}:
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for mapKey, mapValue := range v {
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switch mapKey {
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case "context":
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b.Context = mapValue.(string)
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case "dockerfile":
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b.Dockerfile = mapValue.(string)
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case "args":
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args, err := handleBuildArgs(mapValue)
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if err != nil {
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return err
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}
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b.Args = args
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default:
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// Ignore unknown keys
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continue
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}
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}
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default:
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return fmt.Errorf("Failed to unmarshal Build: %#v", value)
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}
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return nil
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}
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func handleBuildArgs(value interface{}) (map[string]string, error) {
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var args map[string]string
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switch v := value.(type) {
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case map[interface{}]interface{}:
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return handleBuildArgMap(v)
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case []interface{}:
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return handleBuildArgSlice(v)
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default:
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return args, fmt.Errorf("Failed to unmarshal Build args: %#v", value)
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}
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}
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func handleBuildArgSlice(s []interface{}) (map[string]string, error) {
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var args = map[string]string{}
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for _, arg := range s {
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// check if a value is provided
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switch v := strings.SplitN(arg.(string), "=", 2); len(v) {
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case 1:
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// if we have not specified a a value for this build arg, we assign it an ascii null value and query the environment
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// later when we build the service
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args[v[0]] = "\x00"
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case 2:
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// if we do have a value provided, we use it
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args[v[0]] = v[1]
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}
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}
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return args, nil
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}
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func handleBuildArgMap(m map[interface{}]interface{}) (map[string]string, error) {
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args := map[string]string{}
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for mapKey, mapValue := range m {
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var argValue string
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name, ok := mapKey.(string)
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if !ok {
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return args, fmt.Errorf("Cannot unmarshal '%v' to type %T into a string value", name, name)
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}
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switch a := mapValue.(type) {
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case string:
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argValue = a
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case int64:
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argValue = strconv.Itoa(int(a))
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default:
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return args, fmt.Errorf("Cannot unmarshal '%v' to type %T into a string value", mapValue, mapValue)
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}
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args[name] = argValue
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}
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return args, nil
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}
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