github.phpd.cn/hashicorp/packer@v1.3.2/builder/lxc/builder.go (about)

     1  package lxc
     2  
     3  import (
     4  	"log"
     5  	"os"
     6  	"path/filepath"
     7  
     8  	"github.com/hashicorp/packer/common"
     9  	"github.com/hashicorp/packer/helper/multistep"
    10  	"github.com/hashicorp/packer/packer"
    11  	"github.com/hashicorp/packer/template/interpolate"
    12  )
    13  
    14  // The unique ID for this builder
    15  const BuilderId = "ustream.lxc"
    16  
    17  type wrappedCommandTemplate struct {
    18  	Command string
    19  }
    20  
    21  type Builder struct {
    22  	config *Config
    23  	runner multistep.Runner
    24  }
    25  
    26  func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
    27  	c, errs := NewConfig(raws...)
    28  	if errs != nil {
    29  		return nil, errs
    30  	}
    31  	b.config = c
    32  
    33  	return nil, nil
    34  }
    35  
    36  func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packer.Artifact, error) {
    37  	wrappedCommand := func(command string) (string, error) {
    38  		b.config.ctx.Data = &wrappedCommandTemplate{Command: command}
    39  		return interpolate.Render(b.config.CommandWrapper, &b.config.ctx)
    40  	}
    41  
    42  	steps := []multistep.Step{
    43  		new(stepPrepareOutputDir),
    44  		new(stepLxcCreate),
    45  		&StepWaitInit{
    46  			WaitTimeout: b.config.InitTimeout,
    47  		},
    48  		new(StepProvision),
    49  		new(stepExport),
    50  	}
    51  
    52  	// Setup the state bag
    53  	state := new(multistep.BasicStateBag)
    54  	state.Put("config", b.config)
    55  	state.Put("cache", cache)
    56  	state.Put("hook", hook)
    57  	state.Put("ui", ui)
    58  	state.Put("wrappedCommand", CommandWrapper(wrappedCommand))
    59  
    60  	// Run
    61  	b.runner = common.NewRunnerWithPauseFn(steps, b.config.PackerConfig, ui, state)
    62  	b.runner.Run(state)
    63  
    64  	// If there was an error, return that
    65  	if rawErr, ok := state.GetOk("error"); ok {
    66  		return nil, rawErr.(error)
    67  	}
    68  
    69  	// Compile the artifact list
    70  	files := make([]string, 0, 5)
    71  	visit := func(path string, info os.FileInfo, err error) error {
    72  		if !info.IsDir() {
    73  			files = append(files, path)
    74  		}
    75  
    76  		return err
    77  	}
    78  
    79  	if err := filepath.Walk(b.config.OutputDir, visit); err != nil {
    80  		return nil, err
    81  	}
    82  
    83  	artifact := &Artifact{
    84  		dir: b.config.OutputDir,
    85  		f:   files,
    86  	}
    87  
    88  	return artifact, nil
    89  }
    90  
    91  func (b *Builder) Cancel() {
    92  	if b.runner != nil {
    93  		log.Println("Cancelling the step runner...")
    94  		b.runner.Cancel()
    95  	}
    96  }