132 lines
3.1 KiB
Go
132 lines
3.1 KiB
Go
// This package implements a provisioner for Packer that executes
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// shell scripts within the remote machine.
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package shell
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import (
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"bytes"
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"fmt"
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"github.com/mitchellh/iochan"
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"github.com/mitchellh/mapstructure"
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"github.com/mitchellh/packer/packer"
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"io"
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"log"
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"os"
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"strings"
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"text/template"
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)
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const DefaultRemotePath = "/tmp/script.sh"
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type config struct {
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// The local path of the shell script to upload and execute.
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Path string
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// The remote path where the local shell script will be uploaded to.
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// This should be set to a writable file that is in a pre-existing directory.
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RemotePath string `mapstructure:"remote_path"`
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// The command used to execute the script. The '{{ .Path }}' variable
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// should be used to specify where the script goes.
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ExecuteCommand string `mapstructure:"execute_command"`
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}
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type Provisioner struct {
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config config
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}
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type ExecuteCommandTemplate struct {
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Path string
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}
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func (p *Provisioner) Prepare(raws ...interface{}) error {
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for _, raw := range raws {
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if err := mapstructure.Decode(raw, &p.config); err != nil {
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return err
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}
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}
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if p.config.ExecuteCommand == "" {
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p.config.ExecuteCommand = "chmod +x {{.Path}} && {{.Path}}"
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}
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if p.config.RemotePath == "" {
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p.config.RemotePath = DefaultRemotePath
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}
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return nil
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}
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func (p *Provisioner) Provision(ui packer.Ui, comm packer.Communicator) {
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ui.Say(fmt.Sprintf("Provisioning with shell script: %s", p.config.Path))
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log.Printf("Opening %s for reading", p.config.Path)
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f, err := os.Open(p.config.Path)
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if err != nil {
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ui.Error(fmt.Sprintf("Error opening shell script: %s", err))
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return
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}
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log.Printf("Uploading %s => %s", p.config.Path, p.config.RemotePath)
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err = comm.Upload(p.config.RemotePath, f)
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if err != nil {
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ui.Error(fmt.Sprintf("Error uploading shell script: %s", err))
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return
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}
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// Compile the command
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var command bytes.Buffer
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t := template.Must(template.New("command").Parse(p.config.ExecuteCommand))
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t.Execute(&command, &ExecuteCommandTemplate{p.config.RemotePath})
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// Setup the remote command
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stdout_r, stdout_w := io.Pipe()
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stderr_r, stderr_w := io.Pipe()
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var cmd packer.RemoteCmd
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cmd.Command = command.String()
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cmd.Stdout = stdout_w
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cmd.Stderr = stderr_w
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log.Printf("Executing command: %s", cmd.Command)
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err = comm.Start(&cmd)
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if err != nil {
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ui.Error(fmt.Sprintf("Failed executing command: %s", err))
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return
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}
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exitChan := make(chan int, 1)
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stdoutChan := iochan.DelimReader(stdout_r, '\n')
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stderrChan := iochan.DelimReader(stderr_r, '\n')
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go func() {
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defer stdout_w.Close()
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defer stderr_w.Close()
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cmd.Wait()
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exitChan <- cmd.ExitStatus
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}()
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OutputLoop:
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for {
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select {
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case output := <-stderrChan:
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ui.Message(strings.TrimSpace(output))
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case output := <-stdoutChan:
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ui.Message(strings.TrimSpace(output))
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case exitStatus := <-exitChan:
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log.Printf("shell provisioner exited with status %d", exitStatus)
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break OutputLoop
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}
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}
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// Make sure we finish off stdout/stderr because we may have gotten
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// a message from the exit channel first.
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for output := range stdoutChan {
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ui.Message(output)
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}
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for output := range stderrChan {
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ui.Message(output)
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}
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}
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