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Fix LFS commit finder not working (#15856)

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* Create a copy of the sha bytes.


Co-authored-by: Andrew Thornton <art27@cantab.net>
This commit is contained in:
KN4CK3R 2021-05-14 15:12:11 +02:00 • committed by GitHub
commit df72cf6211
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 12 additions and 9 deletions
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13
modules/git/batch_reader.go
View file

@ -186,17 +186,18 @@ headerLoop:
// constant hextable to help quickly convert between 20byte and 40byte hashes
const hextable = "0123456789abcdef"
// To40ByteSHA converts a 20-byte SHA in a 40-byte slice into a 40-byte sha in place
// without allocations. This is at least 100x quicker that hex.EncodeToString
// NB This requires that sha is a 40-byte slice
func To40ByteSHA(sha []byte) []byte {
// To40ByteSHA converts a 20-byte SHA into a 40-byte sha. Input and output can be the
// same 40 byte slice to support in place conversion without allocations.
// This is at least 100x quicker that hex.EncodeToString
// NB This requires that out is a 40-byte slice
func To40ByteSHA(sha, out []byte) []byte {
for i := 19; i >= 0; i-- {
v := sha[i]
vhi, vlo := v>>4, v&0x0f
shi, slo := hextable[vhi], hextable[vlo]
sha[i*2], sha[i*2+1] = shi, slo
out[i*2], out[i*2+1] = shi, slo
}
return sha
return out
}
// ParseTreeLineSkipMode reads an entry from a tree in a cat-file --batch stream

2
modules/git/commit_info_nogogit.go
View file

@ -310,7 +310,7 @@ revListLoop:
commits[0] = string(commitID)
}
}
treeID = To40ByteSHA(treeID)
treeID = To40ByteSHA(treeID, treeID)
_, err = batchStdinWriter.Write(treeID)
if err != nil {
return nil, err

6
modules/git/pipeline/lfs_nogogit.go
View file

@ -72,7 +72,7 @@ func FindLFSFile(repo *git.Repository, hash git.SHA1) ([]*LFSResult, error) {
fnameBuf := make([]byte, 4096)
modeBuf := make([]byte, 40)
workingShaBuf := make([]byte, 40)
workingShaBuf := make([]byte, 20)
for scan.Scan() {
// Get the next commit ID
@ -140,7 +140,9 @@ func FindLFSFile(repo *git.Repository, hash git.SHA1) ([]*LFSResult, error) {
}
resultsMap[curCommit.ID.String()+":"+curPath+string(fname)] = &result
} else if string(mode) == git.EntryModeTree.String() {
trees = append(trees, git.To40ByteSHA(sha20byte))
sha40Byte := make([]byte, 40)
git.To40ByteSHA(sha20byte, sha40Byte)
trees = append(trees, sha40Byte)
paths = append(paths, curPath+string(fname)+"/")
}
}