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repos.go
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repos.go
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// Copyright 2022 The kpt and Nephio Authors
//
// 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 git
import (
"context"
"fmt"
"path/filepath"
"sync"
"time"
gogit "github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/object"
)
type Repos interface {
FindRepo(ctx context.Context, id string) (*Repo, error)
}
// StaticRepos holds multiple registered git repositories
type StaticRepos struct {
mutex sync.Mutex
repos map[string]*Repo
}
// NewRepos constructs an instance of Repos
func NewStaticRepos() *StaticRepos {
return &StaticRepos{
repos: make(map[string]*Repo),
}
}
// FindRepo returns a repo registered under the specified id, or nil if none is registered.
func (r *StaticRepos) FindRepo(ctx context.Context, id string) (*Repo, error) {
r.mutex.Lock()
defer r.mutex.Unlock()
return r.repos[id], nil
}
// Add registers a git repository under the specified id
func (r *StaticRepos) Add(id string, repo *Repo) error {
if !isRepoIDAllowed(id) {
return fmt.Errorf("invalid name %q", id)
}
r.mutex.Lock()
defer r.mutex.Unlock()
if _, found := r.repos[id]; found {
return fmt.Errorf("repo %q already exists", id)
}
r.repos[id] = repo
return nil
}
func NewDynamicRepos(baseDir string, gitRepoOptions []GitRepoOption) *DynamicRepos {
return &DynamicRepos{
baseDir: baseDir,
repos: make(map[string]*dynamicRepo),
gitRepoOptions: gitRepoOptions,
}
}
type DynamicRepos struct {
mutex sync.Mutex
repos map[string]*dynamicRepo
baseDir string
gitRepoOptions []GitRepoOption
}
type dynamicRepo struct {
mutex sync.Mutex
repo *Repo
dir string
gitRepoOptions []GitRepoOption
}
func isRepoIDAllowed(s string) bool {
if len(s) == 0 {
return false
}
for _, r := range s {
if r >= 'a' && r <= 'z' {
// OK
} else if r >= '0' && r <= '9' {
// OK
} else {
switch r {
case '-':
// OK
default:
return false
}
}
}
return true
}
func (r *DynamicRepos) FindRepo(ctx context.Context, id string) (*Repo, error) {
dir := filepath.Join(r.baseDir, id)
if !isRepoIDAllowed(id) {
return nil, fmt.Errorf("invalid name %q", id)
}
r.mutex.Lock()
repo := r.repos[id]
if repo == nil {
repo = &dynamicRepo{
dir: dir,
gitRepoOptions: r.gitRepoOptions,
}
r.repos[id] = repo
}
r.mutex.Unlock()
return repo.open()
}
func (r *dynamicRepo) open() (*Repo, error) {
r.mutex.Lock()
defer r.mutex.Unlock()
if r.repo == nil {
var gogitRepo *gogit.Repository
var err error
if gogitRepo, err = gogit.PlainOpen(r.dir); err != nil {
if err != gogit.ErrRepositoryNotExists {
return nil, fmt.Errorf("failed to open git repository %q: %w", r.dir, err)
}
isBare := true
gogitRepo, err = gogit.PlainInit(r.dir, isBare)
if err != nil {
return nil, fmt.Errorf("failed to initialize git repository %q: %w", r.dir, err)
}
if err := CreateEmptyCommit(gogitRepo); err != nil {
return nil, err
}
// Delete go-git default branch
_ = gogitRepo.Storer.RemoveReference(plumbing.Master)
}
repo, err := NewRepo(gogitRepo, r.gitRepoOptions...)
if err != nil {
return nil, err
}
r.repo = repo
}
return r.repo, nil
}
func CreateEmptyCommit(repo *gogit.Repository) error {
store := repo.Storer
// Create first commit using empty tree.
emptyTree := object.Tree{}
encodedTree := store.NewEncodedObject()
if err := emptyTree.Encode(encodedTree); err != nil {
return fmt.Errorf("failed to encode initial empty commit tree: %w", err)
}
treeHash, err := store.SetEncodedObject(encodedTree)
if err != nil {
return fmt.Errorf("failed to create initial empty commit tree: %w", err)
}
sig := object.Signature{
Name: "Git Server",
Email: "git-server@kpt.dev",
When: time.Now(),
}
commit := object.Commit{
Author: sig,
Committer: sig,
Message: "Empty Commit",
TreeHash: treeHash,
ParentHashes: []plumbing.Hash{}, // No parents
}
encodedCommit := store.NewEncodedObject()
if err := commit.Encode(encodedCommit); err != nil {
return fmt.Errorf("failed to encode initial empty commit: %w", err)
}
commitHash, err := store.SetEncodedObject(encodedCommit)
if err != nil {
return fmt.Errorf("failed to create initial empty commit: %w", err)
}
main := plumbing.NewHashReference(plumbing.ReferenceName("refs/heads/main"), commitHash)
if err := repo.Storer.SetReference(main); err != nil {
return fmt.Errorf("failed to set refs/heads/main to commit sha %s: %w", commitHash, err)
}
head := plumbing.NewSymbolicReference(plumbing.HEAD, "refs/heads/main")
if err := repo.Storer.SetReference(head); err != nil {
return fmt.Errorf("failed to set HEAD to refs/heads/main: %w", err)
}
return nil
}