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repository.go
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repository.go
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package maker
import (
"errors"
"fmt"
"io"
"sync"
git "github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/object"
"github.com/go-git/go-git/v5/plumbing/storer"
"github.com/go-git/go-git/v5/storage/memory"
)
type FileReader interface {
ID() plumbing.Hash
Reader() (io.ReadCloser, error)
}
type Repository struct {
*git.Repository `yaml:"-"`
Snippets map[string]string `yaml:"snippets"`
Alias string `yaml:"alias,omitempty"`
URL string `yaml:"url"`
sync.Mutex `yaml:"-"`
}
func (repository *Repository) Init() error {
if repository.Repository != nil {
return nil
}
repo, err := git.Clone(memory.NewStorage(), nil, &git.CloneOptions{
URL: repository.URL,
})
if err != nil {
return err
}
repository.Repository = repo
return nil
}
func (repository *Repository) changeReference(reference string) error {
_, err := repository.ResolveRevision(plumbing.Revision(reference))
return err
}
func (repository *Repository) isOnReference(reference string) (bool, error) {
currentReference, err := repository.Head()
if err != nil {
return false, err
}
if currentReference.Target().String() == reference {
return true, nil
}
if currentReference.Hash().String() == reference {
return true, nil
}
return false, err
}
// Get returns the snippet file contents reader. The caller is responsible for
// closing it after usage.
func (repository *Repository) Get(reference, name string) (FileReader, error) {
// lock to ensure we retrieve the file from the proper reference
repository.Lock()
defer repository.Unlock()
is, err := repository.isOnReference(reference)
if err != nil {
return nil, err
}
if !is {
err = repository.changeReference(reference)
if err != nil {
return nil, err
}
}
trees, err := repository.TreeObjects()
if err != nil {
return nil, err
}
var file *object.File
err = trees.ForEach(func(t *object.Tree) error {
file, err = t.File(fmt.Sprintf("snippets/%s.mk", name))
if errors.Is(err, object.ErrFileNotFound) {
return nil
}
if err == nil && file != nil {
return storer.ErrStop
}
return err
})
if err != nil {
return nil, err
}
return file, nil
}
func (repository *Repository) HasSnippet(name string) bool {
_, exists := repository.Snippets[name]
return exists
}
func (repository *Repository) AddSnippet(name, version string) error {
if repository.HasSnippet(name) {
return fmt.Errorf("snippet %s already added", name)
}
repository.SetSnippet(name, version)
return nil
}
func (repository *Repository) SetSnippet(name, version string) {
repository.Snippets[name] = version
}