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checkout.go
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checkout.go
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package git
import (
"context"
"fmt"
"io"
"io/fs"
"os"
"path"
"github.com/cardil/deviate/pkg/config/git"
"github.com/cardil/deviate/pkg/errors"
"github.com/go-git/go-billy/v5"
"github.com/go-git/go-billy/v5/memfs"
gitv5 "github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/config"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/storage/memory"
)
func (r Repository) Checkout(remote git.Remote, branch string) git.Checkout { //nolint:ireturn
return &onGoingCheckout{
remote: remote,
branch: branch,
repo: r,
ctx: r.Context,
}
}
type onGoingCheckout struct {
remote git.Remote
branch string
repo Repository
ctx context.Context
}
func (o onGoingCheckout) As(branch string) error {
repo := o.repo.Repository
err := o.repo.Fetch(o.remote)
if err != nil {
return errors.Wrap(err, ErrRemoteOperationFailed)
}
var hash *plumbing.Hash
hash, err = repo.ResolveRevision(o.revision())
if err != nil {
return errors.Wrap(err, ErrLocalOperationFailed)
}
wt, err := repo.Worktree()
if err != nil {
return errors.Wrap(err, ErrLocalOperationFailed)
}
var exist bool
exist, err = o.branchExists(branch)
if err != nil {
return errors.Wrap(err, ErrLocalOperationFailed)
}
coOpts := &gitv5.CheckoutOptions{
Branch: plumbing.NewBranchReferenceName(branch),
}
if !exist {
coOpts.Create = true
coOpts.Hash = *hash
err = repo.CreateBranch(&config.Branch{
Name: branch,
Remote: o.remote.Name,
Merge: plumbing.NewBranchReferenceName(branch),
})
if err != nil {
return errors.Wrap(err, ErrLocalOperationFailed)
}
}
err = wt.Checkout(coOpts)
if err != nil {
return errors.Wrap(err, ErrLocalOperationFailed)
}
return errors.Wrap(wt.Reset(&gitv5.ResetOptions{
Commit: *hash,
Mode: gitv5.HardReset,
}), ErrLocalOperationFailed)
}
func (o onGoingCheckout) OntoWorkspace() error {
coOpts := &gitv5.CloneOptions{
URL: "file://" + o.repo.Project.Path,
ReferenceName: plumbing.NewBranchReferenceName(o.branch),
SingleBranch: true,
Depth: 1,
}
wt := memfs.New()
_, err := gitv5.CloneContext(o.ctx, memory.NewStorage(), wt, coOpts)
if err != nil {
return errors.Wrap(err, ErrLocalOperationFailed)
}
return o.applyTree(wt, "/")
}
func (o onGoingCheckout) applyTree(fs billy.Filesystem, dir string) error {
files, err := fs.ReadDir(dir)
if err != nil {
return errors.Wrap(err, ErrLocalOperationFailed)
}
for _, f := range files {
fp := path.Join(dir, f.Name())
if f.IsDir() {
err = o.applyTree(fs, fp)
if err != nil {
return err
}
continue
}
err = o.applyFile(fs, fp, f.Mode())
if err != nil {
return err
}
}
return nil
}
func (o onGoingCheckout) applyFile(fs billy.Filesystem, filePath string, mode fs.FileMode) error {
fp := path.Join(o.repo.Path, filePath)
dp := path.Dir(fp)
const dirAllowAccessPerm = 0o755
err := os.MkdirAll(dp, dirAllowAccessPerm)
if err != nil {
return errors.Wrap(err, ErrLocalOperationFailed)
}
var (
reader io.ReadCloser
writer io.WriteCloser
)
reader, err = fs.Open(filePath)
if err != nil {
return errors.Wrap(err, ErrLocalOperationFailed)
}
defer func() {
_ = reader.Close()
}()
writer, err = createOfReplaceFile(fp, mode)
if err != nil {
return errors.Wrap(err, ErrLocalOperationFailed)
}
defer func() {
_ = writer.Close()
}()
_, err = io.Copy(writer, reader)
return errors.Wrap(err, ErrLocalOperationFailed)
}
func createOfReplaceFile(filePath string, mode fs.FileMode) (io.WriteCloser, error) {
if _, err := os.Stat(filePath); err == nil {
err = os.Remove(filePath)
if err != nil {
return nil, errors.Wrap(err, ErrLocalOperationFailed)
}
}
wc, err := os.OpenFile(filePath, os.O_CREATE|os.O_WRONLY, mode)
return wc, errors.Wrap(err, ErrLocalOperationFailed)
}
func (o onGoingCheckout) branchExists(branch string) (bool, error) {
repo := o.repo.Repository
iter, err := repo.Branches()
if err != nil {
return false, errors.Wrap(err, ErrLocalOperationFailed)
}
defer iter.Close()
var ref *plumbing.Reference
for ref, err = iter.Next(); !errors.Is(err, io.EOF); ref, err = iter.Next() {
name := ref.Name()
if name.IsBranch() && name.Short() == branch {
return true, nil
}
}
return false, nil
}
func (o onGoingCheckout) revision() plumbing.Revision {
return plumbing.Revision(fmt.Sprintf("%s/%s", o.remote.Name, o.branch))
}