gitea/modules/git/sha1.go
zeripath 6e4480835f
Fix issue with DiffIndex on initial commit (#11677)
Unfortunately #11614 introduced a bug whereby the initial commit of a
repository could not be seen due to there being no parent commit to
create a clear diff from.

Here we create a diffstat from the difference between the parentless SHA and the SHA of the empty tree - a constant known to git. (With thanks to @L0veSunshine for informing me of this SHA)

Thanks to @a1012112796 for initial attempt to fix.

Fix #11650

Closes #11674

Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-Authored-By: L0veSunshine <xuan199651@gmail.com>
2020-05-29 22:14:00 +01:00

63 lines
1.5 KiB
Go

// Copyright 2015 The Gogs Authors. All rights reserved.
// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package git
import (
"encoding/hex"
"fmt"
"regexp"
"strings"
"github.com/go-git/go-git/v5/plumbing"
)
// EmptySHA defines empty git SHA
const EmptySHA = "0000000000000000000000000000000000000000"
// EmptyTreeSHA is the SHA of an empty tree
const EmptyTreeSHA = "4b825dc642cb6eb9a060e54bf8d69288fbee4904"
// SHAPattern can be used to determine if a string is an valid sha
var SHAPattern = regexp.MustCompile(`^[0-9a-f]{4,40}$`)
// SHA1 a git commit name
type SHA1 = plumbing.Hash
// MustID always creates a new SHA1 from a [20]byte array with no validation of input.
func MustID(b []byte) SHA1 {
var id SHA1
copy(id[:], b)
return id
}
// NewID creates a new SHA1 from a [20]byte array.
func NewID(b []byte) (SHA1, error) {
if len(b) != 20 {
return SHA1{}, fmt.Errorf("Length must be 20: %v", b)
}
return MustID(b), nil
}
// MustIDFromString always creates a new sha from a ID with no validation of input.
func MustIDFromString(s string) SHA1 {
b, _ := hex.DecodeString(s)
return MustID(b)
}
// NewIDFromString creates a new SHA1 from a ID string of length 40.
func NewIDFromString(s string) (SHA1, error) {
var id SHA1
s = strings.TrimSpace(s)
if len(s) != 40 {
return id, fmt.Errorf("Length must be 40: %s", s)
}
b, err := hex.DecodeString(s)
if err != nil {
return id, err
}
return NewID(b)
}