forked from SUSE/container-feeder
/
docker.go
103 lines (86 loc) · 2.55 KB
/
docker.go
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/*
* container-feeder: import Linux container images delivered as RPMs
* Copyright 2017 SUSE LLC
*
* 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 (
"io/ioutil"
"os"
"os/exec"
"strings"
"golang.org/x/net/context"
"github.com/docker/docker/api/types"
"github.com/docker/docker/client"
)
// Figure the API version supported by the server
// by shelling out.
func dockerDaemonAPIVersion() (string, error) {
out, err := exec.Command(
"docker",
"version",
"--format",
"{{.Server.APIVersion}}").Output()
if err != nil {
return "", err
}
api := strings.Trim(string(out[:]), "\n")
return api, nil
}
// Connects to the local daemon using the right version of the API
func connectToDaemon() (*client.Client, error) {
// Set the exact version of the API in use, otherwise the library will
// try to use the latest one, which might be too newer compared to the
// one supported by the docker daemon
apiVersion, err := dockerDaemonAPIVersion()
if err != nil {
return nil, err
}
if err := os.Setenv("DOCKER_API_VERSION", apiVersion); err != nil {
return nil, err
}
return client.NewEnvClient()
}
// Returns images available on the docker host
// The images are stored inside of a list of strings where
// each string is following this convention: "<repo>:<tag>"
func existingImages(cli *client.Client) ([]string, error) {
tags := []string{}
images, err := cli.ImageList(context.Background(), types.ImageListOptions{})
if err != nil {
return tags, err
}
for _, image := range images {
for _, tag := range image.RepoTags {
tags = append(tags, tag)
}
}
return tags, nil
}
// Loads the specified image into docker
// Returns the message produced by the docker daemon
func loadDockerImage(cli *client.Client, pathToImage string) (string, error) {
image, err := os.Open(pathToImage)
if err != nil {
return "", err
}
defer image.Close()
ret, err := cli.ImageLoad(context.Background(), image, true)
if err != nil {
return "", err
}
defer ret.Body.Close()
b, err := ioutil.ReadAll(ret.Body)
return string(b[:]), nil
}