/
executor.go
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/
executor.go
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// Copyright 2021 Google Inc. 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 shell
import (
"bufio"
"bytes"
"os/exec"
)
// To rebuild mocks, run `go generate ./...`
//go:generate go run github.com/golang/mock/mockgen -package mocks -source $GOFILE -mock_names=Executor=MockShellExecutor -destination ../../../mocks/mock_shell_exececutor.go
// Executor is a shim over cmd.Output() that allows for testing.
type Executor interface {
// Exec executes program with args, and returns stdout if the return code is zero.
// If nonzero, stderr is included in error.
Exec(program string, args ...string) (string, error)
// ExecLines is similar to Exec, except it splits the output on newlines. All empty
// lines are discarded.
ExecLines(program string, args ...string) ([]string, error)
}
// NewShellExecutor creates a shell.Executor that is implemented by exec.Command.
func NewShellExecutor() Executor {
return &defaultShellExecutor{}
}
type defaultShellExecutor struct {
}
func (d *defaultShellExecutor) Exec(program string, args ...string) (string, error) {
cmd := exec.Command(program, args...)
stdout, err := cmd.Output()
return string(stdout), err
}
func (d *defaultShellExecutor) ExecLines(program string, args ...string) (allLines []string, err error) {
cmd := exec.Command(program, args...)
stdout, err := cmd.Output()
scanner := bufio.NewScanner(bytes.NewReader(stdout))
for scanner.Scan() {
line := scanner.Text()
if line != "" {
allLines = append(allLines, line)
}
}
return allLines, err
}