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docker.go
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docker.go
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/*
* Copyright 2015 Fabrício Godoy
*
* 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 docker
/*
* Based on https://github.com/niilo/golib/blob/master/test/dockertest/docker.go
* Copyright 2014 The Camlistore Authors
*/
import (
"bytes"
"os/exec"
)
const (
// DockerBinaryName defines the default name for Docker binary.
DockerBinaryName = "docker"
)
// A Docker represents a Docker binary.
type Docker struct {
binCmd string
}
// NewDocker creates a new instance of Docker with default binary name.
func NewDocker() *Docker {
return &Docker{
binCmd: DockerBinaryName,
}
}
// HasBin check whether Docker binary is available.
func (s *Docker) HasBin() bool {
_, err := exec.LookPath(s.binCmd)
return err == nil
}
// Run executes especified command on Docker.
//
// Returns ExternalCmdError on error.
func (s *Docker) Run(cmd string, args ...string) (string, error) {
cmdArgs := make([]string, 0, len(args)+1)
cmdArgs = append(cmdArgs, cmd)
cmdArgs = append(cmdArgs, args...)
exe := exec.Command(s.binCmd, cmdArgs...)
var stdout, stderr bytes.Buffer
exe.Stdout, exe.Stderr = &stdout, &stderr
if err := exe.Run(); err != nil {
return stdout.String(), ExternalCmdError{
err, stderr.String(), stdout.String()}
}
return stdout.String(), nil
}