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Fix incorrect object id hash function (#30708)

Browse Source 
Great thanks to @oliverpool for figuring out the problem and proposing a
fix.

Regression of #28138

Incorrect hash causes the user's LFS files get all deleted when running
`doctor fix all`

(by the way, remove unused/non-standard comments)

Co-authored-by: Giteabot <teabot@gitea.io>
This commit is contained in:
wxiaoguang 2024-04-26 17:49:48 +08:00 committed by GitHub
parent 1e749b80d7
commit cd70ab31cd
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
3 changed files with 8 additions and 15 deletions
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16
modules/git/object_format.go
View File

@ -33,7 +33,6 @@ type ObjectFormat interface {
ComputeHash(t ObjectType, content []byte) ObjectID
}
/* SHA1 Type */
type Sha1ObjectFormatImpl struct{}
var (
@ -70,14 +69,10 @@ func (h Sha1ObjectFormatImpl) ComputeHash(t ObjectType, content []byte) ObjectID
_, _ = hasher.Write([]byte(" "))
_, _ = hasher.Write([]byte(strconv.FormatInt(int64(len(content)), 10)))
_, _ = hasher.Write([]byte{0})
// HashSum generates a SHA1 for the provided hash
var sha1 Sha1Hash
copy(sha1[:], hasher.Sum(nil))
return &sha1
_, _ = hasher.Write(content)
return h.MustID(hasher.Sum(nil))
}
/* SHA256 Type */
type Sha256ObjectFormatImpl struct{}
var (
@ -116,11 +111,8 @@ func (h Sha256ObjectFormatImpl) ComputeHash(t ObjectType, content []byte) Object
_, _ = hasher.Write([]byte(" "))
_, _ = hasher.Write([]byte(strconv.FormatInt(int64(len(content)), 10)))
_, _ = hasher.Write([]byte{0})
// HashSum generates a SHA256 for the provided hash
var sha256 Sha1Hash
copy(sha256[:], hasher.Sum(nil))
return &sha256
_, _ = hasher.Write(content)
return h.MustID(hasher.Sum(nil))
}
var (

3
modules/git/object_id.go
View File

@ -16,7 +16,6 @@ type ObjectID interface {
Type() ObjectFormat
}
/* SHA1 */
type Sha1Hash [20]byte
func (h *Sha1Hash) String() string {
@ -40,7 +39,6 @@ func MustIDFromString(hexHash string) ObjectID {
return id
}
/* SHA256 */
type Sha256Hash [32]byte
func (h *Sha256Hash) String() string {
@ -54,7 +52,6 @@ func (h *Sha256Hash) IsZero() bool {
func (h *Sha256Hash) RawValue() []byte { return h[:] }
func (*Sha256Hash) Type() ObjectFormat { return Sha256ObjectFormat }
/* utility */
func NewIDFromString(hexHash string) (ObjectID, error) {
var theObjectFormat ObjectFormat
for _, objectFormat := range SupportedObjectFormats {

4
modules/git/object_id_test.go
View File

@ -18,4 +18,8 @@ func TestIsValidSHAPattern(t *testing.T) {
assert.False(t, h.IsValid("abc"))
assert.False(t, h.IsValid("123g"))
assert.False(t, h.IsValid("some random text"))
assert.Equal(t, "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391", ComputeBlobHash(Sha1ObjectFormat, nil).String())
assert.Equal(t, "2e65efe2a145dda7ee51d1741299f848e5bf752e", ComputeBlobHash(Sha1ObjectFormat, []byte("a")).String())
assert.Equal(t, "473a0f4c3be8a93681a267e3b1e9a7dcda1185436fe141f7749120a303721813", ComputeBlobHash(Sha256ObjectFormat, nil).String())
assert.Equal(t, "eb337bcee2061c5313c9a1392116b6c76039e9e30d71467ae359b36277e17dc7", ComputeBlobHash(Sha256ObjectFormat, []byte("a")).String())
}