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clone.go
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clone.go
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// Copyright 2024 Eric Cornelissen
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package github
import (
"fmt"
"os"
"path"
"github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/plumbing"
)
// A Repository represents a GitHub repository.
type Repository struct {
// Owner is the name of the user or organization that owns the project.
Owner string
// Project is the name of the project to clone.
Project string
// Ref is the reference to check out.
Ref string
}
// Clone will clone the given repository at the exact ref from GitHub into the
// given directory. Note that the git index will be omitted.
func Clone(dir string, repo *Repository) error {
if err := clone(dir, repo); err != nil {
return err
}
if err := os.RemoveAll(path.Join(dir, ".git")); err != nil {
return fmt.Errorf("could not remove git index: %v", err)
}
return nil
}
func clone(dir string, repo *Repository) error {
if err := cloneAtTag(dir, repo); err == nil {
return nil
}
if err := cloneAtBranch(dir, repo); err == nil {
return nil
}
return cloneAtCommit(dir, repo)
}
func cloneAtBranch(dir string, repo *Repository) error {
opts := git.CloneOptions{
URL: toUrl(repo),
Depth: 1,
SingleBranch: true,
Tags: git.NoTags,
ReferenceName: plumbing.NewBranchReferenceName(repo.Ref),
}
_, err := git.PlainClone(dir, false, &opts)
if err != nil {
return fmt.Errorf("could not clone %q (as branch) from %q: %v", repo.Ref, opts.URL, err)
}
return nil
}
func cloneAtCommit(dir string, repo *Repository) error {
cloneOpts := git.CloneOptions{
URL: toUrl(repo),
Tags: git.NoTags,
}
repository, err := git.PlainClone(dir, false, &cloneOpts)
if err != nil {
return fmt.Errorf("could not clone from %q: %v", cloneOpts.URL, err)
}
worktree, err := repository.Worktree()
if err != nil {
return fmt.Errorf("could not obtain worktree for %s/%s: %v", repo.Owner, repo.Project, err)
}
checkoutOpts := git.CheckoutOptions{
Hash: plumbing.NewHash(repo.Ref),
}
if err = worktree.Checkout(&checkoutOpts); err == nil {
return nil
}
return fmt.Errorf("could not checkout ref %q for %s/%s: %v", repo.Ref, repo.Owner, repo.Project, err)
}
func cloneAtTag(dir string, repo *Repository) error {
opts := git.CloneOptions{
URL: toUrl(repo),
Depth: 1,
SingleBranch: true,
Tags: git.NoTags,
ReferenceName: plumbing.NewTagReferenceName(repo.Ref),
}
_, err := git.PlainClone(dir, false, &opts)
if err != nil {
return fmt.Errorf("could not clone %q (as tag) from %q: %v", repo.Ref, opts.URL, err)
}
return nil
}
func toUrl(repo *Repository) (url string) {
return fmt.Sprintf("https://github.com/%s/%s", repo.Owner, repo.Project)
}