// NewRockerfile reads parses Rockerfile from an io.Reader
func NewRockerfile(name string, in io.Reader, vars template.Vars, funs template.Funs) (r *Rockerfile, err error) {
r = &Rockerfile{
Name: name,
Vars: vars,
Funs: funs,
}
var (
source []byte
content *bytes.Buffer
)
if source, err = ioutil.ReadAll(in); err != nil {
return nil, fmt.Errorf("Failed to read Rockerfile %s, error: %s", name, err)
}
r.Source = string(source)
if content, err = template.Process(name, bytes.NewReader(source), vars, funs); err != nil {
return nil, err
}
r.Content = content.String()
// TODO: update parser from Docker
if r.rootNode, err = parser.Parse(content); err != nil {
return nil, err
}
return r, nil
}
func parseOnbuildCommands(onBuildTriggers []string) ([]ConfigCommand, error) {
commands := []ConfigCommand{}
for _, step := range onBuildTriggers {
ast, err := parser.Parse(strings.NewReader(step))
if err != nil {
return commands, err
}
for _, n := range ast.Children {
switch strings.ToUpper(n.Value) {
case "ONBUILD":
return commands, fmt.Errorf("Chaining ONBUILD via `ONBUILD ONBUILD` isn't allowed")
case "MAINTAINER", "FROM":
return commands, fmt.Errorf("%s isn't allowed as an ONBUILD trigger", n.Value)
}
commands = append(commands, parseCommand(n, true))
}
}
return commands, nil
}