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package dotgit
import (
"errors"
"os"
"strings"
"gopkg.in/src-d/go-git.v4/core"
"gopkg.in/src-d/go-git.v4/utils/fs"
)
const (
suffix = ".git"
packedRefsPath = "packed-refs"
configPath = "config"
)
var (
// ErrNotFound is returned by New when the path is not found.
ErrNotFound = errors.New("path not found")
// ErrIdxNotFound is returned by Idxfile when the idx file is not found
ErrIdxNotFound = errors.New("idx file not found")
// ErrPackfileNotFound is returned by Packfile when the packfile is not found
ErrPackfileNotFound = errors.New("packfile not found")
// ErrObjfileNotFound is returned by Objectfile when the objectffile is not found
ErrObjfileNotFound = errors.New("object file not found")
// ErrConfigNotFound is returned by Config when the config is not found
ErrConfigNotFound = errors.New("config file not found")
)
// The DotGit type represents a local git repository on disk. This
// type is not zero-value-safe, use the New function to initialize it.
type DotGit struct {
fs fs.FS
path string
}
// New returns a DotGit value ready to be used. The path argument must
// be the absolute path of a git repository directory (e.g.
// "/foo/bar/.git").
func New(fs fs.FS, path string) (*DotGit, error) {
d := &DotGit{fs: fs, path: path}
if _, err := fs.Stat(path); err != nil {
if os.IsNotExist(err) {
return nil, ErrNotFound
}
return nil, err
}
return d, nil
}
// Refs scans the git directory collecting references, which it returns.
// Symbolic references are resolved and included in the output.
func (d *DotGit) Refs() ([]*core.Reference, error) {
var refs []*core.Reference
if err := d.addRefsFromPackedRefs(&refs); err != nil {
return nil, err
}
if err := d.addRefsFromRefDir(&refs); err != nil {
return nil, err
}
if err := d.addRefFromHEAD(&refs); err != nil {
return nil, err
}
return refs, nil
}
// Packfile returns the path of the packfile (really, it returns the
// path of the first file in the "objects/pack/" directory with a
// ".pack" extension.
func (d *DotGit) Packfile() (fs.FS, string, error) {
packDir := d.fs.Join(d.path, "objects", "pack")
files, err := d.fs.ReadDir(packDir)
if err != nil {
if os.IsNotExist(err) {
return nil, "", ErrPackfileNotFound
}
return nil, "", err
}
for _, f := range files {
if strings.HasSuffix(f.Name(), ".pack") {
return d.fs, d.fs.Join(packDir, f.Name()), nil
}
}
return nil, "", ErrPackfileNotFound
}
// Idxfile returns the path of the idx file (really, it returns the
// path of the first file in the "objects/pack/" directory with an
// ".idx" extension.
func (d *DotGit) Idxfile() (fs.FS, string, error) {
packDir := d.fs.Join(d.path, "objects", "pack")
files, err := d.fs.ReadDir(packDir)
if err != nil {
if os.IsNotExist(err) {
return nil, "", ErrIdxNotFound
}
return nil, "", err
}
for _, f := range files {
if strings.HasSuffix(f.Name(), ".idx") {
return d.fs, d.fs.Join(packDir, f.Name()), nil
}
}
return nil, "", ErrIdxNotFound
}
// Config returns the path of the config file
func (d *DotGit) Config() (fs.FS, string, error) {
configFile := d.fs.Join(d.path, configPath)
if _, err := d.fs.Stat(configFile); err != nil {
if os.IsNotExist(err) {
return nil, "", ErrNotFound
}
return nil, "", err
}
return d.fs, configFile, nil
}
// Objectfiles returns a slice with the hashes of objects found under the
// .git/objects/ directory.
func (dg *DotGit) Objectfiles() (fs.FS, []core.Hash, error) {
objsDir := dg.fs.Join(dg.path, "objects")
files, err := dg.fs.ReadDir(objsDir)
if err != nil {
if os.IsNotExist(err) {
return nil, nil, ErrObjfileNotFound
}
return nil, nil, err
}
var objects []core.Hash
for _, f := range files {
if f.IsDir() && len(f.Name()) == 2 && isHex(f.Name()) {
objDir := f.Name()
d, err := dg.fs.ReadDir(dg.fs.Join(objsDir, objDir))
if err != nil {
return nil, nil, err
}
for _, o := range d {
objects = append(objects, core.NewHash(objDir+o.Name()))
}
}
}
return dg.fs, objects, nil
}
func isHex(s string) bool {
for _, b := range []byte(s) {
if isNum(b) {
continue
}
if isHexAlpha(b) {
continue
}
return false
}
return true
}
func isNum(b byte) bool {
return b >= '0' && b <= '9'
}
func isHexAlpha(b byte) bool {
return b >= 'a' && b <= 'f' || b >= 'A' && b <= 'F'
}
// Objectfile returns the path of the object file for a given hash
// *if the file exists*, otherwise returns an ErrObjfileNotFound error.
func (d *DotGit) Objectfile(h core.Hash) (fs.FS, string, error) {
hash := h.String()
objFile := d.fs.Join(d.path, "objects", hash[0:2], hash[2:40])
if _, err := d.fs.Stat(objFile); err != nil {
if os.IsNotExist(err) {
return nil, "", ErrObjfileNotFound
}
return nil, "", err
}
return d.fs, objFile, nil
}
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