7c891bd5f2
message: Initial commit, can create master commit and verify previous master commits change_hash: ADgeVBdfi1hA0TTDrBIkYHaQQYoxZaInZz1p/BAH35Ng credentials: - type: pgp_signature pub_key_id: 95C46FA6A41148AC body: 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 account: mediocregopher
76 lines
1.6 KiB
Go
76 lines
1.6 KiB
Go
package dehub
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import (
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"crypto/sha256"
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"encoding/binary"
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"fmt"
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"hash"
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"sort"
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"gopkg.in/src-d/go-git.v4/plumbing/object"
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)
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var (
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defaultHashHelperAlgo = sha256.New
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)
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type hashHelper struct {
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hash.Hash
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varintBuf []byte
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}
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// if h is nil it then defaultHashHelperAlgo will be used
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func newHashHelper(h hash.Hash) *hashHelper {
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if h == nil {
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h = defaultHashHelperAlgo()
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}
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s := &hashHelper{
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Hash: h,
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varintBuf: make([]byte, binary.MaxVarintLen64),
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}
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return s
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}
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func (s *hashHelper) writeUint(i uint64) {
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n := binary.PutUvarint(s.varintBuf, i)
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if _, err := s.Write(s.varintBuf[:n]); err != nil {
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panic(fmt.Sprintf("error writing %x to sha256 sum: %v", s.varintBuf[:n], err))
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}
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}
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func (s *hashHelper) writeStr(str string) {
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s.writeUint(uint64(len(str)))
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s.Write([]byte(str))
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}
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func (s *hashHelper) writeTreeDiff(from, to *object.Tree) {
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filesChanged, err := calcDiff(from, to)
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if err != nil {
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panic(err.Error())
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}
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sort.Slice(filesChanged, func(i, j int) bool {
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return filesChanged[i].path < filesChanged[j].path
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})
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s.writeUint(uint64(len(filesChanged)))
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for _, fileChanged := range filesChanged {
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s.writeStr(fileChanged.path)
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s.Write(fileChanged.fromMode.Bytes())
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s.Write(fileChanged.fromHash[:])
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s.Write(fileChanged.toMode.Bytes())
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s.Write(fileChanged.toHash[:])
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}
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}
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var changeHashVersion = []byte{0}
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// if h is nil it then defaultHashHelperAlgo will be used
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func genChangeHash(h hash.Hash, msg string, from, to *object.Tree) []byte {
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s := newHashHelper(h)
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s.writeStr(msg)
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s.writeTreeDiff(from, to)
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return s.Sum(changeHashVersion)
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}
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