142 lines
3.3 KiB
Go
142 lines
3.3 KiB
Go
// Copyright 2017 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package build
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import (
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"os/exec"
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)
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// Cmd is a wrapper of os/exec.Cmd that integrates with the build context for
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// logging, the config's Environment for simpler environment modification, and
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// implements hooks for sandboxing
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type Cmd struct {
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*exec.Cmd
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Environment *Environment
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Sandbox Sandbox
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ctx Context
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config Config
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name string
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}
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func Command(ctx Context, config Config, name string, executable string, args ...string) *Cmd {
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ret := &Cmd{
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Cmd: exec.CommandContext(ctx.Context, executable, args...),
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Environment: config.Environment().Copy(),
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Sandbox: noSandbox,
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ctx: ctx,
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config: config,
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name: name,
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}
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return ret
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}
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func (c *Cmd) prepare() {
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if c.Env == nil {
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c.Env = c.Environment.Environ()
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}
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if c.sandboxSupported() {
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c.wrapSandbox()
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}
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c.ctx.Verboseln(c.Path, c.Args)
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}
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func (c *Cmd) Start() error {
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c.prepare()
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return c.Cmd.Start()
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}
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func (c *Cmd) Run() error {
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c.prepare()
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err := c.Cmd.Run()
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return err
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}
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func (c *Cmd) Output() ([]byte, error) {
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c.prepare()
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bytes, err := c.Cmd.Output()
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return bytes, err
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}
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func (c *Cmd) CombinedOutput() ([]byte, error) {
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c.prepare()
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bytes, err := c.Cmd.CombinedOutput()
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return bytes, err
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}
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// StartOrFatal is equivalent to Start, but handles the error with a call to ctx.Fatal
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func (c *Cmd) StartOrFatal() {
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if err := c.Start(); err != nil {
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c.ctx.Fatalf("Failed to run %s: %v", c.name, err)
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}
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}
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func (c *Cmd) reportError(err error) {
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if err == nil {
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return
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}
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if e, ok := err.(*exec.ExitError); ok {
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c.ctx.Fatalf("%s failed with: %v", c.name, e.ProcessState.String())
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} else {
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c.ctx.Fatalf("Failed to run %s: %v", c.name, err)
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}
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}
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// RunOrFatal is equivalent to Run, but handles the error with a call to ctx.Fatal
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func (c *Cmd) RunOrFatal() {
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c.reportError(c.Run())
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}
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// WaitOrFatal is equivalent to Wait, but handles the error with a call to ctx.Fatal
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func (c *Cmd) WaitOrFatal() {
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c.reportError(c.Wait())
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}
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// OutputOrFatal is equivalent to Output, but handles the error with a call to ctx.Fatal
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func (c *Cmd) OutputOrFatal() []byte {
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ret, err := c.Output()
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c.reportError(err)
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return ret
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}
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// CombinedOutputOrFatal is equivalent to CombinedOutput, but handles the error with
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// a call to ctx.Fatal
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func (c *Cmd) CombinedOutputOrFatal() []byte {
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ret, err := c.CombinedOutput()
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c.reportError(err)
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return ret
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}
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// RunAndPrintOrFatal will run the command, then after finishing
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// print any output, then handling any errors with a call to
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// ctx.Fatal
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func (c *Cmd) RunAndPrintOrFatal() {
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ret, err := c.CombinedOutput()
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st := c.ctx.Status.StartTool()
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if len(ret) > 0 {
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if err != nil {
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st.Error(string(ret))
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} else {
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st.Print(string(ret))
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}
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}
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st.Finish()
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c.reportError(err)
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}
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