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// Copyright 2019 CUE 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 os
import (
"os"
"strings"
"cuelang.org/go/cue"
"cuelang.org/go/cue/ast"
"cuelang.org/go/cue/errors"
"cuelang.org/go/internal/cli"
"cuelang.org/go/internal/task"
)
func init() {
task.Register("tool/os.Getenv", newGetenvCmd)
task.Register("tool/os.Environ", newEnvironCmd)
// TODO:
// Tasks:
// - Exit?
// - Getwd/ Setwd (or in tool/file?)
// Functions:
// - Hostname
// - UserCache/Home/Config (or in os/user?)
}
type getenvCmd struct{}
func newGetenvCmd(v cue.Value) (task.Runner, error) {
return &getenvCmd{}, nil
}
func (c *getenvCmd) Run(ctx *task.Context) (res interface{}, err error) {
iter, err := ctx.Obj.Fields()
if err != nil {
return nil, err
}
update := map[string]interface{}{}
for iter.Next() {
name := iter.Selector().Unquoted()
if strings.HasPrefix(name, "$") {
continue
}
v := iter.Value()
if err := v.Err(); err != nil {
return nil, err
}
if err := validateEntry(name, v); err != nil {
return nil, err
}
str, ok := os.LookupEnv(name)
if !ok {
update[name] = nil
continue
}
x, err := fromString(name, str, v)
if err != nil {
return nil, err
}
update[name] = x
}
return update, nil
}
type environCmd struct{}
func newEnvironCmd(v cue.Value) (task.Runner, error) {
return &environCmd{}, nil
}
func (c *environCmd) Run(ctx *task.Context) (res interface{}, err error) {
iter, err := ctx.Obj.Fields()
if err != nil {
return nil, err
}
update := map[string]interface{}{}
for _, kv := range os.Environ() {
name, str, _ := strings.Cut(kv, "=")
if v := ctx.Obj.LookupPath(cue.MakePath(cue.Str(name))); v.Exists() {
update[name], err = fromString(name, str, v)
if err != nil {
return nil, err
}
} else {
update[name] = str
}
}
for iter.Next() {
name := iter.Selector().Unquoted()
if strings.HasPrefix(name, "$") {
continue
}
v := iter.Value()
if err := v.Err(); err != nil {
return nil, err
}
if err := validateEntry(name, v); err != nil {
return nil, err
}
if _, ok := update[name]; !ok {
update[name] = nil
}
}
return update, nil
}
func validateEntry(name string, v cue.Value) error {
if k := v.IncompleteKind(); k&^(cue.NumberKind|cue.NullKind|cue.BoolKind|cue.StringKind) != 0 {
return errors.Newf(v.Pos(),
"invalid type %s for environment variable %s", k, name)
}
return nil
}
func fromString(name, str string, v cue.Value) (x ast.Node, err error) {
k := v.IncompleteKind()
return cli.ParseValue(v.Pos(), name, str, k)
}
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