1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
// Copyright 2021 The Bazel Authors. All rights reserved.
//
// 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 main
import (
"bytes"
"context"
"fmt"
"os"
"os/exec"
"strings"
)
// runForError runs a command without showing its output. If the command fails,
// runForError returns an error containing its stderr.
func runForError(ctx context.Context, dir string, name string, args ...string) error {
stderr := &bytes.Buffer{}
cmd := exec.CommandContext(ctx, name, args...)
cmd.Env = envWithoutBazel()
cmd.Dir = dir
cmd.Stdout = nil
cmd.Stderr = stderr
err := cmd.Run()
return cleanCmdError(err, name, args, stderr.Bytes())
}
// runForOutput runs a command and returns its output. If the command fails,
// runForOutput returns an error containing its stderr. The command's output
// is returned whether it failed or not.
func runForOutput(ctx context.Context, dir string, name string, args ...string) ([]byte, error) {
stdout := &bytes.Buffer{}
stderr := &bytes.Buffer{}
cmd := exec.CommandContext(ctx, name, args...)
cmd.Env = envWithoutBazel()
cmd.Dir = dir
cmd.Stdout = stdout
cmd.Stderr = stderr
err := cmd.Run()
return stdout.Bytes(), cleanCmdError(err, name, args, stderr.Bytes())
}
// envWithoutBazel runs the current process's environment without variables
// starting with "BUILD_" added by 'bazel run'. These can confuse subprocesses.
func envWithoutBazel() []string {
env := os.Environ()
filtered := make([]string, 0, len(env))
for _, e := range env {
if strings.HasPrefix(e, "BUILD_") {
continue
}
filtered = append(filtered, e)
}
return filtered
}
// cleanCmdError wraps an error returned by exec.Cmd.Run with the command that
// was run and its stderr output.
func cleanCmdError(err error, name string, args []string, stderr []byte) error {
if err == nil {
return nil
}
return &commandError{
argv: append([]string{name}, args...),
err: err,
}
}
type commandError struct {
argv []string
stderr []byte
err error
}
func (e *commandError) Error() string {
return fmt.Sprintf("running %s: %v\n%s", strings.Join(e.argv, " "), e.err, bytes.TrimSpace(e.stderr))
}
func (e *commandError) Unwrap() error {
return e.err
}
|
