build and convert implementations

centos: WIP

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>

dockerfile.go

@@ -0,0 +1,72 @@
+// 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 docker2vm
+
+import (
+	_ "embed"
+	"fmt"
+	"io"
+	"text/template"
+)
+
+//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 Dockerfile struct {
+	Image    string
+	Password string
+	Release  OSRelease
+	tmpl     *template.Template
+}
+
+func (d Dockerfile) Render(w io.Writer) error {
+	return d.tmpl.Execute(w, d)
+}
+
+func NewDockerfile(release OSRelease, img, password string) (Dockerfile, error) {
+	if password == "" {
+		password = "root"
+	}
+	d := Dockerfile{Release: release, Image: img, Password: password}
+	switch release.ID {
+	case ReleaseDebian:
+		d.tmpl = debianDockerfileTemplate
+	case ReleaseUbuntu:
+		d.tmpl = ubuntuDockerfileTemplate
+	case ReleaseAlpine:
+		d.tmpl = alpineDockerfileTemplate
+	case ReleaseCentOS:
+		d.tmpl = centOSDockerfileTemplate
+	default:
+		return Dockerfile{}, fmt.Errorf("unsupported distribution: %s", release.ID)
+	}
+	return d, nil
+}