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411 lines (315 loc) · 9.8 KB
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// Package repository contains helper methods for working with the Git repo.
package repository
import (
"bytes"
"fmt"
"path"
"path/filepath"
"strings"
"sync"
"github.com/MichaelMure/git-bug/util/lamport"
)
const (
clockPath = "git-bug"
)
var _ ClockedRepo = &GitRepo{}
var _ TestedRepo = &GitRepo{}
// GitRepo represents an instance of a (local) git repository.
type GitRepo struct {
gitCli
path string
clocksMutex sync.Mutex
clocks map[string]lamport.Clock
keyring Keyring
}
// NewGitRepo determines if the given working directory is inside of a git repository,
// and returns the corresponding GitRepo instance if it is.
func NewGitRepo(path string, clockLoaders []ClockLoader) (*GitRepo, error) {
k, err := defaultKeyring()
if err != nil {
return nil, err
}
repo := &GitRepo{
gitCli: gitCli{path: path},
path: path,
clocks: make(map[string]lamport.Clock),
keyring: k,
}
// Check the repo and retrieve the root path
stdout, err := repo.runGitCommand("rev-parse", "--absolute-git-dir")
// Now dir is fetched with "git rev-parse --git-dir". May be it can
// still return nothing in some cases. Then empty stdout check is
// kept.
if err != nil || stdout == "" {
return nil, ErrNotARepo
}
// Fix the path to be sure we are at the root
repo.path = stdout
repo.gitCli.path = stdout
for _, loader := range clockLoaders {
allExist := true
for _, name := range loader.Clocks {
if _, err := repo.getClock(name); err != nil {
allExist = false
}
}
if !allExist {
err = loader.Witnesser(repo)
if err != nil {
return nil, err
}
}
}
return repo, nil
}
// InitGitRepo create a new empty git repo at the given path
func InitGitRepo(path string) (*GitRepo, error) {
repo := &GitRepo{
gitCli: gitCli{path: path},
path: path + "/.git",
clocks: make(map[string]lamport.Clock),
}
_, err := repo.runGitCommand("init", path)
if err != nil {
return nil, err
}
return repo, nil
}
// InitBareGitRepo create a new --bare empty git repo at the given path
func InitBareGitRepo(path string) (*GitRepo, error) {
repo := &GitRepo{
gitCli: gitCli{path: path},
path: path,
clocks: make(map[string]lamport.Clock),
}
_, err := repo.runGitCommand("init", "--bare", path)
if err != nil {
return nil, err
}
return repo, nil
}
// LocalConfig give access to the repository scoped configuration
func (repo *GitRepo) LocalConfig() Config {
return newGitConfig(repo.gitCli, false)
}
// GlobalConfig give access to the global scoped configuration
func (repo *GitRepo) GlobalConfig() Config {
return newGitConfig(repo.gitCli, true)
}
// AnyConfig give access to a merged local/global configuration
func (repo *GitRepo) AnyConfig() ConfigRead {
return mergeConfig(repo.LocalConfig(), repo.GlobalConfig())
}
// Keyring give access to a user-wide storage for secrets
func (repo *GitRepo) Keyring() Keyring {
return repo.keyring
}
// GetPath returns the path to the repo.
func (repo *GitRepo) GetPath() string {
return filepath.FromSlash(repo.path)
}
// GetUserName returns the name the the user has used to configure git
func (repo *GitRepo) GetUserName() (string, error) {
return repo.runGitCommand("config", "user.name")
}
// GetUserEmail returns the email address that the user has used to configure git.
func (repo *GitRepo) GetUserEmail() (string, error) {
return repo.runGitCommand("config", "user.email")
}
// GetCoreEditor returns the name of the editor that the user has used to configure git.
func (repo *GitRepo) GetCoreEditor() (string, error) {
return repo.runGitCommand("var", "GIT_EDITOR")
}
// GetRemotes returns the configured remotes repositories.
func (repo *GitRepo) GetRemotes() (map[string]string, error) {
stdout, err := repo.runGitCommand("remote", "--verbose")
if err != nil {
return nil, err
}
lines := strings.Split(stdout, "\n")
remotes := make(map[string]string, len(lines))
for _, line := range lines {
if strings.TrimSpace(line) == "" {
continue
}
elements := strings.Fields(line)
if len(elements) != 3 {
return nil, fmt.Errorf("git remote: unexpected output format: %s", line)
}
remotes[elements[0]] = elements[1]
}
return remotes, nil
}
// FetchRefs fetch git refs from a remote
func (repo *GitRepo) FetchRefs(remote, refSpec string) (string, error) {
stdout, err := repo.runGitCommand("fetch", remote, refSpec)
if err != nil {
return stdout, fmt.Errorf("failed to fetch from the remote '%s': %v", remote, err)
}
return stdout, err
}
// PushRefs push git refs to a remote
func (repo *GitRepo) PushRefs(remote string, refSpec string) (string, error) {
stdout, stderr, err := repo.runGitCommandRaw(nil, "push", remote, refSpec)
if err != nil {
return stdout + stderr, fmt.Errorf("failed to push to the remote '%s': %v", remote, stderr)
}
return stdout + stderr, nil
}
// StoreData will store arbitrary data and return the corresponding hash
func (repo *GitRepo) StoreData(data []byte) (Hash, error) {
var stdin = bytes.NewReader(data)
stdout, err := repo.runGitCommandWithStdin(stdin, "hash-object", "--stdin", "-w")
return Hash(stdout), err
}
// ReadData will attempt to read arbitrary data from the given hash
func (repo *GitRepo) ReadData(hash Hash) ([]byte, error) {
var stdout bytes.Buffer
var stderr bytes.Buffer
err := repo.runGitCommandWithIO(nil, &stdout, &stderr, "cat-file", "-p", string(hash))
if err != nil {
return []byte{}, err
}
return stdout.Bytes(), nil
}
// StoreTree will store a mapping key-->Hash as a Git tree
func (repo *GitRepo) StoreTree(entries []TreeEntry) (Hash, error) {
buffer := prepareTreeEntries(entries)
stdout, err := repo.runGitCommandWithStdin(&buffer, "mktree")
if err != nil {
return "", err
}
return Hash(stdout), nil
}
// StoreCommit will store a Git commit with the given Git tree
func (repo *GitRepo) StoreCommit(treeHash Hash) (Hash, error) {
stdout, err := repo.runGitCommand("commit-tree", string(treeHash))
if err != nil {
return "", err
}
return Hash(stdout), nil
}
// StoreCommitWithParent will store a Git commit with the given Git tree
func (repo *GitRepo) StoreCommitWithParent(treeHash Hash, parent Hash) (Hash, error) {
stdout, err := repo.runGitCommand("commit-tree", string(treeHash),
"-p", string(parent))
if err != nil {
return "", err
}
return Hash(stdout), nil
}
// UpdateRef will create or update a Git reference
func (repo *GitRepo) UpdateRef(ref string, hash Hash) error {
_, err := repo.runGitCommand("update-ref", ref, string(hash))
return err
}
// RemoveRef will remove a Git reference
func (repo *GitRepo) RemoveRef(ref string) error {
_, err := repo.runGitCommand("update-ref", "-d", ref)
return err
}
// ListRefs will return a list of Git ref matching the given refspec
func (repo *GitRepo) ListRefs(refPrefix string) ([]string, error) {
stdout, err := repo.runGitCommand("for-each-ref", "--format=%(refname)", refPrefix)
if err != nil {
return nil, err
}
split := strings.Split(stdout, "\n")
if len(split) == 1 && split[0] == "" {
return []string{}, nil
}
return split, nil
}
// RefExist will check if a reference exist in Git
func (repo *GitRepo) RefExist(ref string) (bool, error) {
stdout, err := repo.runGitCommand("for-each-ref", ref)
if err != nil {
return false, err
}
return stdout != "", nil
}
// CopyRef will create a new reference with the same value as another one
func (repo *GitRepo) CopyRef(source string, dest string) error {
_, err := repo.runGitCommand("update-ref", dest, source)
return err
}
// ListCommits will return the list of commit hashes of a ref, in chronological order
func (repo *GitRepo) ListCommits(ref string) ([]Hash, error) {
stdout, err := repo.runGitCommand("rev-list", "--first-parent", "--reverse", ref)
if err != nil {
return nil, err
}
split := strings.Split(stdout, "\n")
casted := make([]Hash, len(split))
for i, line := range split {
casted[i] = Hash(line)
}
return casted, nil
}
// ReadTree will return the list of entries in a Git tree
func (repo *GitRepo) ReadTree(hash Hash) ([]TreeEntry, error) {
stdout, err := repo.runGitCommand("ls-tree", string(hash))
if err != nil {
return nil, err
}
return readTreeEntries(stdout)
}
// FindCommonAncestor will return the last common ancestor of two chain of commit
func (repo *GitRepo) FindCommonAncestor(hash1 Hash, hash2 Hash) (Hash, error) {
stdout, err := repo.runGitCommand("merge-base", string(hash1), string(hash2))
if err != nil {
return "", err
}
return Hash(stdout), nil
}
// GetTreeHash return the git tree hash referenced in a commit
func (repo *GitRepo) GetTreeHash(commit Hash) (Hash, error) {
stdout, err := repo.runGitCommand("rev-parse", string(commit)+"^{tree}")
if err != nil {
return "", err
}
return Hash(stdout), nil
}
// GetOrCreateClock return a Lamport clock stored in the Repo.
// If the clock doesn't exist, it's created.
func (repo *GitRepo) GetOrCreateClock(name string) (lamport.Clock, error) {
c, err := repo.getClock(name)
if err == nil {
return c, nil
}
if err != ErrClockNotExist {
return nil, err
}
repo.clocksMutex.Lock()
defer repo.clocksMutex.Unlock()
p := path.Join(repo.path, clockPath, name+"-clock")
c, err = lamport.NewPersistedClock(p)
if err != nil {
return nil, err
}
repo.clocks[name] = c
return c, nil
}
func (repo *GitRepo) getClock(name string) (lamport.Clock, error) {
repo.clocksMutex.Lock()
defer repo.clocksMutex.Unlock()
if c, ok := repo.clocks[name]; ok {
return c, nil
}
p := path.Join(repo.path, clockPath, name+"-clock")
c, err := lamport.LoadPersistedClock(p)
if err == nil {
repo.clocks[name] = c
return c, nil
}
if err == lamport.ErrClockNotExist {
return nil, ErrClockNotExist
}
return nil, err
}
// AddRemote add a new remote to the repository
// Not in the interface because it's only used for testing
func (repo *GitRepo) AddRemote(name string, url string) error {
_, err := repo.runGitCommand("remote", "add", name, url)
return err
}