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package dotgit
import (
"bufio"
"errors"
"io/ioutil"
"os"
"strings"
"gopkg.in/src-d/go-git.v4/core"
)
var (
// ErrPackedRefsDuplicatedRef is returned when a duplicated
// reference is found in the packed-ref file. This is usually the
// case for corrupted git repositories.
ErrPackedRefsDuplicatedRef = errors.New("duplicated ref found in packed-ref file")
// ErrPackedRefsBadFormat is returned when the packed-ref file
// corrupt.
ErrPackedRefsBadFormat = errors.New("malformed packed-ref")
// ErrSymRefTargetNotFound is returned when a symbolic reference is
// targeting a non-existing object. This usually means the
// repository is corrupt.
ErrSymRefTargetNotFound = errors.New("symbolic reference target not found")
)
const (
refsPath = "refs"
)
func (d *DotGit) addRefsFromPackedRefs(refs *[]*core.Reference) (err error) {
f, err := d.fs.Open(packedRefsPath)
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
defer func() {
if errClose := f.Close(); err == nil {
err = errClose
}
}()
s := bufio.NewScanner(f)
for s.Scan() {
ref, err := d.processLine(s.Text())
if err != nil {
return err
}
if ref != nil {
*refs = append(*refs, ref)
}
}
return s.Err()
}
// process lines from a packed-refs file
func (d *DotGit) processLine(line string) (*core.Reference, error) {
switch line[0] {
case '#': // comment - ignore
return nil, nil
case '^': // annotated tag commit of the previous line - ignore
return nil, nil
default:
ws := strings.Split(line, " ") // hash then ref
if len(ws) != 2 {
return nil, ErrPackedRefsBadFormat
}
return core.NewReferenceFromStrings(ws[1], ws[0]), nil
}
}
func (d *DotGit) addRefsFromRefDir(refs *[]*core.Reference) error {
return d.walkReferencesTree(refs, refsPath)
}
func (d *DotGit) walkReferencesTree(refs *[]*core.Reference, relPath string) error {
files, err := d.fs.ReadDir(relPath)
if err != nil {
return err
}
for _, f := range files {
newRelPath := d.fs.Join(relPath, f.Name())
if f.IsDir() {
if err = d.walkReferencesTree(refs, newRelPath); err != nil {
return err
}
continue
}
ref, err := d.readReferenceFile(".", newRelPath)
if err != nil {
return err
}
if ref != nil {
*refs = append(*refs, ref)
}
}
return nil
}
func (d *DotGit) addRefFromHEAD(refs *[]*core.Reference) error {
ref, err := d.readReferenceFile(".", "HEAD")
if err != nil {
return err
}
*refs = append(*refs, ref)
return nil
}
func (d *DotGit) readReferenceFile(refsPath, refFile string) (ref *core.Reference, err error) {
path := d.fs.Join(refsPath, refFile)
f, err := d.fs.Open(path)
if err != nil {
return nil, err
}
defer func() {
if errClose := f.Close(); err == nil {
err = errClose
}
}()
b, err := ioutil.ReadAll(f)
if err != nil {
return nil, err
}
line := strings.TrimSpace(string(b))
return core.NewReferenceFromStrings(refFile, line), nil
}
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