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132 lines
3.5 KiB
Go
132 lines
3.5 KiB
Go
// Copyright 2016 bee authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"): you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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package dockerize
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import (
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"flag"
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"os"
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"path"
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"path/filepath"
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"strings"
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"text/template"
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"github.com/beego/bee/v2/cmd/commands"
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"github.com/beego/bee/v2/cmd/commands/version"
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beeLogger "github.com/beego/bee/v2/logger"
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"github.com/beego/bee/v2/utils"
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)
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const dockerBuildTemplate = `FROM {{.BaseImage}}
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# Godep for vendoring
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RUN go get github.com/tools/godep
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# Recompile the standard library without CGO
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RUN CGO_ENABLED=0 go install -a std
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ENV APP_DIR $GOPATH{{.Appdir}}
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RUN mkdir -p $APP_DIR
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# Set the entrypoint
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ENTRYPOINT (cd $APP_DIR && ./{{.Entrypoint}})
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ADD . $APP_DIR
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# Compile the binary and statically link
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RUN cd $APP_DIR && CGO_ENABLED=0 godep go build -ldflags '-d -w -s'
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EXPOSE {{.Expose}}
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`
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// Dockerfile holds the information about the Docker container.
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type Dockerfile struct {
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BaseImage string
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Appdir string
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Entrypoint string
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Expose string
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}
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var CmdDockerize = &commands.Command{
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CustomFlags: true,
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UsageLine: "dockerize",
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Short: "Generates a Dockerfile for your Beego application",
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Long: `Dockerize generates a Dockerfile for your Beego Web Application.
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The Dockerfile will compile, get the dependencies with {{"godep"|bold}}, and set the entrypoint.
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{{"Example:"|bold}}
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$ bee dockerize -expose="3000,80,25"
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`,
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PreRun: func(cmd *commands.Command, args []string) { version.ShowShortVersionBanner() },
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Run: dockerizeApp,
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}
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var (
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expose string
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baseImage string
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)
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func init() {
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fs := flag.NewFlagSet("dockerize", flag.ContinueOnError)
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fs.StringVar(&baseImage, "image", "library/golang", "Set the base image of the Docker container.")
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fs.StringVar(&expose, "expose", "8080", "Port(s) to expose in the Docker container.")
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CmdDockerize.Flag = *fs
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commands.AvailableCommands = append(commands.AvailableCommands, CmdDockerize)
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}
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func dockerizeApp(cmd *commands.Command, args []string) int {
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if err := cmd.Flag.Parse(args); err != nil {
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beeLogger.Log.Fatalf("Error parsing flags: %v", err.Error())
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}
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beeLogger.Log.Info("Generating Dockerfile...")
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gopath := os.Getenv("GOPATH")
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dir, err := filepath.Abs(".")
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if err != nil {
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beeLogger.Log.Error(err.Error())
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}
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appdir := strings.Replace(dir, gopath, "", 1)
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// In case of multiple ports to expose inside the container,
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// replace all the commas with whitespaces.
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// See the verb EXPOSE in the Docker documentation.
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expose = strings.Replace(expose, ",", " ", -1)
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_, entrypoint := path.Split(appdir)
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dockerfile := Dockerfile{
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BaseImage: baseImage,
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Appdir: appdir,
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Entrypoint: entrypoint,
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Expose: expose,
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}
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generateDockerfile(dockerfile)
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return 0
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}
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func generateDockerfile(df Dockerfile) {
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t := template.Must(template.New("dockerBuildTemplate").Parse(dockerBuildTemplate)).Funcs(utils.BeeFuncMap())
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f, err := os.Create("Dockerfile")
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if err != nil {
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beeLogger.Log.Fatalf("Error writing Dockerfile: %v", err.Error())
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}
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defer utils.CloseFile(f)
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t.Execute(f, df)
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beeLogger.Log.Success("Dockerfile generated.")
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}
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