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bootstrapper.go
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bootstrapper.go
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package truss
import (
"bytes"
"fmt"
"os"
"path/filepath"
"text/template"
)
// Bootstrapper bootstraps a deployment
type Bootstrapper struct {
TemplateSource
TrussDir string
Template string
}
// BootstrapManifest represents the manifest thingy
type BootstrapManifest struct {
Params []struct {
Name string `yaml:"name"`
Type string `yaml:"type"`
Prompt string `yaml:"prompt"`
Default interface{} `yaml:"default"`
} `yaml:"params"`
}
// TemplateSource sources templates
type TemplateSource interface {
ListTemplates() ([]string, error)
LocalDirectory(template string) (string, error)
GetTemplateManifest(t string) *BootstrapManifest
Cleanup()
}
// NewBootstrapper returns a new TemplateSource
func NewBootstrapper(ts TemplateSource, trussDir, template string) *Bootstrapper {
return &Bootstrapper{ts, trussDir, template}
}
// GetTemplateManifest gets a template's manifest
func (b Bootstrapper) GetTemplateManifest() *BootstrapManifest {
return b.TemplateSource.GetTemplateManifest(b.Template)
}
// Bootstrap does the thing!
func (b Bootstrapper) Bootstrap(params *BootstrapParams) error {
wd, _ := os.Getwd()
trussDir := filepath.Join(wd, b.TrussDir)
if _, err := os.Stat(trussDir); err == nil {
return fmt.Errorf("the target directory [%s] already exists", trussDir)
}
l, err := b.LocalDirectory(b.Template)
if err != nil {
return err
}
return filepath.Walk(l, func(path string, info os.FileInfo, err error) error {
rel, _ := filepath.Rel(l, path)
data := map[string]interface{}{
"Params": params,
"TrussDir": b.TrussDir,
"Template": b.Template,
}
if rel == ".truss-manifest.yaml" {
return nil
}
if info.IsDir() {
dstDir, err := quickTemplate(filepath.Join(trussDir, rel), data)
if err != nil {
return err
}
return os.MkdirAll(dstDir, 0766)
}
t, err := template.ParseFiles(path)
if err != nil {
return err
}
dstFile, err := quickTemplate(filepath.Join(trussDir, rel), data)
if err != nil {
return err
}
dst, err := os.Create(dstFile)
if err != nil {
return err
}
defer dst.Close()
return t.Execute(dst, data)
})
}
func quickTemplate(tmpl string, data map[string]interface{}) (string, error) {
t, err := template.New("dstFile").Parse(tmpl)
if err != nil {
return "", err
}
out := bytes.NewBuffer(nil)
if err := t.Execute(out, data); err != nil {
return "", err
}
return out.String(), nil
}