tmpl/registry/registry.go

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package registry
import (
"errors"
"io/ioutil"
"os"
"path/filepath"
"strings"
"time"
"github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/plumbing"
"github.com/mholt/archiver/v3"
"gopkg.in/yaml.v3"
)
// Registry is a collection of Template
type Registry struct {
dir string
Sources []*Source `yaml:"sources"`
Templates []*Template `yaml:"templates"`
}
func (r *Registry) save() error {
fi, err := os.Create(r.MetaFilePath())
if err != nil {
return err
}
if err := yaml.NewEncoder(fi).Encode(r); err != nil {
return err
}
return fi.Close()
}
// MetaFilePath is the path to the Registry meta-file
func (r *Registry) MetaFilePath() string {
return filepath.Join(r.dir, "registry.yaml")
}
// GetTemplate retrieves a Template from the Registry
func (r *Registry) GetTemplate(name string) (*Template, error) {
for _, t := range r.Templates {
if strings.EqualFold(name, t.Name) {
t.reg = r
return t, nil
}
}
return nil, ErrTemplateNotFound{Name: name}
}
// DownloadTemplate downloads and adds a new Template to the Registry
func (r *Registry) DownloadTemplate(name, repo, branch string) (*Template, error) {
if _, err := r.GetTemplate(name); err == nil {
return nil, ErrTemplateExists{Name: name}
}
t := &Template{
reg: r,
Name: name,
Repository: repo,
Branch: branch,
LastUpdate: time.Now(),
}
r.Templates = append(r.Templates, t)
if err := download(repo, branch, t.ArchivePath()); err != nil {
return nil, err
}
return t, r.save()
}
// SaveTemplate saves a local Template to the Registry
func (r *Registry) SaveTemplate(name, path string) (*Template, error) {
if _, err := r.GetTemplate(name); err == nil {
return nil, ErrTemplateExists{Name: name}
}
t := &Template{
reg: r,
Name: name,
Path: path,
LastUpdate: time.Now(),
}
r.Templates = append(r.Templates, t)
if err := save(path, t.ArchivePath()); err != nil {
return nil, err
}
return t, r.save()
}
// RemoveTemplate removes the Template from disk and meta
func (r *Registry) RemoveTemplate(name string) error {
_, err := r.GetTemplate(name)
if err != nil {
return err
}
for idx, t := range r.Templates {
if strings.EqualFold(name, t.Name) {
r.Templates = append(r.Templates[:idx], r.Templates[idx+1:]...)
if err := os.Remove(t.ArchivePath()); err != nil {
return err
}
return r.save()
}
}
return nil
}
// UpdateTemplate updates the Template on disk and in meta
func (r *Registry) UpdateTemplate(name string) error {
_, err := r.GetTemplate(name)
if err != nil {
return err
}
for idx, t := range r.Templates {
if strings.EqualFold(name, t.Name) {
// If the path doesn't exist, we are replacing it regardless
if err := os.Remove(t.ArchivePath()); err != nil && !os.IsNotExist(err) {
return err
}
// Cut it out of the template list so we don't get a duplicate
r.Templates = append(r.Templates[:idx], r.Templates[idx+1:]...)
// If path exists, it is local
if t.Path != "" {
_, err = r.SaveTemplate(t.Name, t.Path)
} else {
_, err = r.DownloadTemplate(t.Name, t.Repository, t.Branch)
}
return err
}
}
return nil
}
// GetSource retrieves a Source from the Registry
func (r *Registry) GetSource(name string) (*Source, error) {
for _, s := range r.Sources {
if strings.EqualFold(name, s.Name) {
return s, nil
}
}
return nil, ErrSourceNotFound{Name: name}
}
// AddSource adds a new Source to the Registry
func (r *Registry) AddSource(url, name string) (*Source, error) {
url = strings.TrimSuffix(url, "/") + "/"
s := &Source{
Name: name,
URL: url,
}
r.Sources = append(r.Sources, s)
return s, r.save()
}
// RemoveSource removes the Source from the registry meta
func (r *Registry) RemoveSource(name string) error {
_, err := r.GetSource(name)
if err != nil {
return err
}
for idx, s := range r.Sources {
if strings.EqualFold(name, s.Name) {
r.Sources = append(r.Sources[:idx], r.Sources[idx+1:]...)
}
}
return r.save()
}
// Open opens a Registry, creating one if none exists at dir
func Open(dir string) (*Registry, error) {
reg := Registry{
dir: dir,
}
_, err := os.Lstat(reg.MetaFilePath())
if err != nil {
if os.IsNotExist(err) {
if err := create(reg.MetaFilePath()); err != nil {
return nil, err
}
} else {
return nil, err
}
}
contents, err := os.ReadFile(reg.MetaFilePath())
if err != nil {
return nil, err
}
if err := yaml.Unmarshal(contents, &reg); err != nil {
return nil, err
}
for _, tmpl := range reg.Templates {
tmpl.reg = &reg
}
return &reg, nil
}
func create(regFile string) error {
if err := os.MkdirAll(filepath.Dir(regFile), os.ModePerm); err != nil {
return err
}
fi, err := os.Create(regFile)
if err != nil {
return err
}
return fi.Close()
}
func download(cloneURL, branch, dest string) error {
tmp, err := ioutil.TempDir(os.TempDir(), "tmpl")
if err != nil {
return err
}
defer os.RemoveAll(tmp)
// Clone the repo
if _, err := git.PlainClone(tmp, false, &git.CloneOptions{
URL: cloneURL,
ReferenceName: plumbing.NewBranchReferenceName(branch),
SingleBranch: true,
Depth: 1,
Progress: os.Stdout,
}); err != nil {
return err
}
// Remove .git
if err := os.RemoveAll(filepath.Join(tmp, ".git")); err != nil {
return err
}
// Save the template
if err := save(tmp, dest); err != nil {
return err
}
return nil
}
func save(source, dest string) error {
// Make sure it's a valid template
if _, err := os.Lstat(filepath.Join(source, "tmpl.yaml")); err != nil {
return err
}
fi, err := os.Lstat(filepath.Join(source, "template"))
if err != nil {
return err
}
if !fi.IsDir() {
return errors.New("template found, expected directory")
}
// Create archive
glob, err := filepath.Glob(filepath.Join(source, "*"))
if err != nil {
return err
}
if err := archiver.Archive(glob, dest); err != nil {
return err
}
return nil
}