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d2vm/dockerfile.go

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// Copyright 2022 Linka Cloud 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 d2vm
import (
_ "embed"
"fmt"
"io"
"text/template"
"github.com/sirupsen/logrus"
)
//go:embed templates/ubuntu.Dockerfile
var ubuntuDockerfile string
//go:embed templates/debian.Dockerfile
var debianDockerfile string
//go:embed templates/alpine.Dockerfile
var alpineDockerfile string
//go:embed templates/centos.Dockerfile
var centOSDockerfile string
var (
ubuntuDockerfileTemplate = template.Must(template.New("ubuntu.Dockerfile").Parse(ubuntuDockerfile))
debianDockerfileTemplate = template.Must(template.New("debian.Dockerfile").Parse(debianDockerfile))
alpineDockerfileTemplate = template.Must(template.New("alpine.Dockerfile").Parse(alpineDockerfile))
centOSDockerfileTemplate = template.Must(template.New("centos.Dockerfile").Parse(centOSDockerfile))
)
type NetworkManager string
const (
NetworkManagerNone NetworkManager = "none"
NetworkManagerIfupdown2 NetworkManager = "ifupdown"
NetworkManagerNetplan NetworkManager = "netplan"
)
func (n NetworkManager) Validate() error {
switch n {
case NetworkManagerNone, NetworkManagerIfupdown2, NetworkManagerNetplan:
return nil
default:
return fmt.Errorf("unsupported network manager: %s", n)
}
}
type Dockerfile struct {
Image string
Password string
Release OSRelease
NetworkManager NetworkManager
Luks bool
tmpl *template.Template
}
func (d Dockerfile) Render(w io.Writer) error {
return d.tmpl.Execute(w, d)
}
func NewDockerfile(release OSRelease, img, password string, networkManager NetworkManager, luks bool) (Dockerfile, error) {
d := Dockerfile{Release: release, Image: img, Password: password, NetworkManager: networkManager, Luks: luks}
var net NetworkManager
switch release.ID {
case ReleaseDebian:
d.tmpl = debianDockerfileTemplate
net = NetworkManagerIfupdown2
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case ReleaseKali:
d.tmpl = debianDockerfileTemplate
net = NetworkManagerIfupdown2
case ReleaseUbuntu:
d.tmpl = ubuntuDockerfileTemplate
net = NetworkManagerNetplan
case ReleaseAlpine:
d.tmpl = alpineDockerfileTemplate
net = NetworkManagerIfupdown2
if networkManager == NetworkManagerNetplan {
return d, fmt.Errorf("netplan is not supported on alpine")
}
case ReleaseCentOS:
d.tmpl = centOSDockerfileTemplate
net = NetworkManagerNone
if networkManager != "" && networkManager != NetworkManagerNone {
return Dockerfile{}, fmt.Errorf("network manager is not supported on centos")
}
default:
return Dockerfile{}, fmt.Errorf("unsupported distribution: %s", release.ID)
}
if d.NetworkManager == "" {
if release.ID != ReleaseCentOS {
logrus.Warnf("no network manager specified, using distribution defaults: %s", net)
}
d.NetworkManager = net
}
if err := d.NetworkManager.Validate(); err != nil {
return Dockerfile{}, err
}
return d, nil
}