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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 exec
import (
"fmt"
"os/exec"
"strings"
"cuelang.org/go/cue"
"cuelang.org/go/cue/errors"
"cuelang.org/go/internal/task"
)
func init() {
task.Register("tool/exec.Run", newExecCmd)
// For backwards compatibility.
task.Register("exec", newExecCmd)
}
type execCmd struct{}
func newExecCmd(v cue.Value) (task.Runner, error) {
return &execCmd{}, nil
}
func (c *execCmd) Run(ctx *task.Context) (res interface{}, err error) {
cmd, doc, err := mkCommand(ctx)
if err != nil {
return cue.Value{}, err
}
// TODO: set environment variables, if defined.
stream := func(name string) (stream cue.Value, ok bool) {
c := ctx.Obj.LookupPath(cue.ParsePath(name))
if err := c.Null(); c.Err() != nil || err == nil {
return
}
return c, true
}
if v, ok := stream("stdin"); !ok {
cmd.Stdin = ctx.Stdin
} else if cmd.Stdin, err = v.Reader(); err != nil {
return nil, errors.Wrapf(err, v.Pos(), "invalid input")
}
_, captureOut := stream("stdout")
if !captureOut {
cmd.Stdout = ctx.Stdout
}
_, captureErr := stream("stderr")
if !captureErr {
cmd.Stderr = ctx.Stderr
}
v := ctx.Obj.LookupPath(cue.ParsePath("mustSucceed"))
mustSucceed, err := v.Bool()
if err != nil {
return nil, errors.Wrapf(err, v.Pos(), "invalid bool value")
}
update := map[string]interface{}{}
if captureOut {
var stdout []byte
stdout, err = cmd.Output()
update["stdout"] = string(stdout)
} else {
err = cmd.Run()
}
update["success"] = err == nil
if err == nil {
return update, nil
}
if captureErr {
if exit := (*exec.ExitError)(nil); errors.As(err, &exit) {
update["stderr"] = string(exit.Stderr)
} else {
update["stderr"] = err.Error()
}
}
if !mustSucceed {
return update, nil
}
return nil, fmt.Errorf("command %q failed: %v", doc, err)
}
// mkCommand builds an [exec.Cmd] from a CUE task value,
// also returning the full list of arguments as a string slice
// so that it can be used in error messages.
func mkCommand(ctx *task.Context) (c *exec.Cmd, doc []string, err error) {
v := ctx.Lookup("cmd")
if ctx.Err != nil {
return nil, nil, ctx.Err
}
var bin string
var args []string
switch v.Kind() {
case cue.StringKind:
str, _ := v.String()
list := strings.Fields(str)
bin, args = list[0], list[1:]
case cue.ListKind:
list, _ := v.List()
if !list.Next() {
return nil, nil, errors.New("empty command list")
}
bin, err = list.Value().String()
if err != nil {
return nil, nil, err
}
for list.Next() {
str, err := list.Value().String()
if err != nil {
return nil, nil, err
}
args = append(args, str)
}
}
if bin == "" {
return nil, nil, errors.New("empty command")
}
cmd := exec.CommandContext(ctx.Context, bin, args...)
cmd.Dir, _ = ctx.Obj.LookupPath(cue.ParsePath("dir")).String()
env := ctx.Obj.LookupPath(cue.ParsePath("env"))
// List case.
for iter, _ := env.List(); iter.Next(); {
v, _ := iter.Value().Default()
str, err := v.String()
if err != nil {
return nil, nil, errors.Wrapf(err, v.Pos(),
"invalid environment variable value %q", v)
}
cmd.Env = append(cmd.Env, str)
}
// Struct case.
for iter, _ := env.Fields(); iter.Next(); {
label := iter.Selector().Unquoted()
v, _ := iter.Value().Default()
var str string
switch v.Kind() {
case cue.StringKind:
str, _ = v.String()
case cue.IntKind, cue.FloatKind, cue.NumberKind:
str = fmt.Sprint(v)
default:
return nil, nil, errors.Newf(v.Pos(),
"invalid environment variable value %q", v)
}
cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", label, str))
}
return cmd, append([]string{bin}, args...), nil
}
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