A fork of Gitea (see branch `mj`) adding Majority Judgment Polls 𐄷 over Issues and Merge Requests. https://git.mieuxvoter.fr
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// Copyright 2017 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.
// +build !gogit
package git
import (
"bufio"
"bytes"
"fmt"
"io"
"math"
"path"
"sort"
"strings"
)
// GetCommitsInfo gets information of all commits that are corresponding to these entries
func (tes Entries) GetCommitsInfo(commit *Commit, treePath string, cache *LastCommitCache) ([]CommitInfo, *Commit, error) {
entryPaths := make([]string, len(tes)+1)
// Get the commit for the treePath itself
entryPaths[0] = ""
for i, entry := range tes {
entryPaths[i+1] = entry.Name()
}
var err error
var revs map[string]*Commit
if cache != nil {
var unHitPaths []string
revs, unHitPaths, err = getLastCommitForPathsByCache(commit.ID.String(), treePath, entryPaths, cache)
if err != nil {
return nil, nil, err
}
if len(unHitPaths) > 0 {
sort.Strings(unHitPaths)
commits, err := GetLastCommitForPaths(commit, treePath, unHitPaths)
if err != nil {
return nil, nil, err
}
for i, found := range commits {
if err := cache.Put(commit.ID.String(), path.Join(treePath, unHitPaths[i]), found.ID.String()); err != nil {
return nil, nil, err
}
revs[unHitPaths[i]] = found
}
}
} else {
sort.Strings(entryPaths)
revs = map[string]*Commit{}
var foundCommits []*Commit
foundCommits, err = GetLastCommitForPaths(commit, treePath, entryPaths)
for i, found := range foundCommits {
revs[entryPaths[i]] = found
}
}
if err != nil {
return nil, nil, err
}
commitsInfo := make([]CommitInfo, len(tes))
for i, entry := range tes {
commitsInfo[i] = CommitInfo{
Entry: entry,
}
if entryCommit, ok := revs[entry.Name()]; ok {
commitsInfo[i].Commit = entryCommit
if entry.IsSubModule() {
subModuleURL := ""
var fullPath string
if len(treePath) > 0 {
fullPath = treePath + "/" + entry.Name()
} else {
fullPath = entry.Name()
}
if subModule, err := commit.GetSubModule(fullPath); err != nil {
return nil, nil, err
} else if subModule != nil {
subModuleURL = subModule.URL
}
subModuleFile := NewSubModuleFile(entryCommit, subModuleURL, entry.ID.String())
commitsInfo[i].SubModuleFile = subModuleFile
}
}
}
// Retrieve the commit for the treePath itself (see above). We basically
// get it for free during the tree traversal and it's used for listing
// pages to display information about newest commit for a given path.
var treeCommit *Commit
var ok bool
if treePath == "" {
treeCommit = commit
} else if treeCommit, ok = revs[""]; ok {
treeCommit.repo = commit.repo
}
return commitsInfo, treeCommit, nil
}
func getLastCommitForPathsByCache(commitID, treePath string, paths []string, cache *LastCommitCache) (map[string]*Commit, []string, error) {
var unHitEntryPaths []string
var results = make(map[string]*Commit)
for _, p := range paths {
lastCommit, err := cache.Get(commitID, path.Join(treePath, p))
if err != nil {
return nil, nil, err
}
if lastCommit != nil {
results[p] = lastCommit.(*Commit)
continue
}
unHitEntryPaths = append(unHitEntryPaths, p)
}
return results, unHitEntryPaths, nil
}
// GetLastCommitForPaths returns last commit information
func GetLastCommitForPaths(commit *Commit, treePath string, paths []string) ([]*Commit, error) {
// We read backwards from the commit to obtain all of the commits
// We'll do this by using rev-list to provide us with parent commits in order
revListReader, revListWriter := io.Pipe()
defer func() {
_ = revListWriter.Close()
_ = revListReader.Close()
}()
go func() {
stderr := strings.Builder{}
err := NewCommand("rev-list", "--format=%T", commit.ID.String()).RunInDirPipeline(commit.repo.Path, revListWriter, &stderr)
if err != nil {
_ = revListWriter.CloseWithError(ConcatenateError(err, (&stderr).String()))
} else {
_ = revListWriter.Close()
}
}()
batchStdinWriter, batchReader, cancel := CatFileBatch(commit.repo.Path)
defer cancel()
mapsize := 4096
if len(paths) > mapsize {
mapsize = len(paths)
}
path2idx := make(map[string]int, mapsize)
for i, path := range paths {
path2idx[path] = i
}
fnameBuf := make([]byte, 4096)
modeBuf := make([]byte, 40)
allShaBuf := make([]byte, (len(paths)+1)*20)
shaBuf := make([]byte, 20)
tmpTreeID := make([]byte, 40)
// commits is the returnable commits matching the paths provided
commits := make([]string, len(paths))
// ids are the blob/tree ids for the paths
ids := make([][]byte, len(paths))
// We'll use a scanner for the revList because it's simpler than a bufio.Reader
scan := bufio.NewScanner(revListReader)
revListLoop:
for scan.Scan() {
// Get the next parent commit ID
commitID := scan.Text()
if !scan.Scan() {
break revListLoop
}
commitID = commitID[7:]
rootTreeID := scan.Text()
// push the tree to the cat-file --batch process
_, err := batchStdinWriter.Write([]byte(rootTreeID + "\n"))
if err != nil {
return nil, err
}
currentPath := ""
// OK if the target tree path is "" and the "" is in the paths just set this now
if treePath == "" && paths[0] == "" {
// If this is the first time we see this set the id appropriate for this paths to this tree and set the last commit to curCommit
if len(ids[0]) == 0 {
ids[0] = []byte(rootTreeID)
commits[0] = string(commitID)
} else if bytes.Equal(ids[0], []byte(rootTreeID)) {
commits[0] = string(commitID)
}
}
treeReadingLoop:
for {
_, _, size, err := ReadBatchLine(batchReader)
if err != nil {
return nil, err
}
// Handle trees
// n is counter for file position in the tree file
var n int64
// Two options: currentPath is the targetTreepath
if treePath == currentPath {
// We are in the right directory
// Parse each tree line in turn. (don't care about mode here.)
for n < size {
fname, sha, count, err := ParseTreeLineSkipMode(batchReader, fnameBuf, shaBuf)
shaBuf = sha
if err != nil {
return nil, err
}
n += int64(count)
idx, ok := path2idx[string(fname)]
if ok {
// Now if this is the first time round set the initial Blob(ish) SHA ID and the commit
if len(ids[idx]) == 0 {
copy(allShaBuf[20*(idx+1):20*(idx+2)], shaBuf)
ids[idx] = allShaBuf[20*(idx+1) : 20*(idx+2)]
commits[idx] = string(commitID)
} else if bytes.Equal(ids[idx], shaBuf) {
commits[idx] = string(commitID)
}
}
// FIXME: is there any order to the way strings are emitted from cat-file?
// if there is - then we could skip once we've passed all of our data
}
break treeReadingLoop
}
var treeID []byte
// We're in the wrong directory
// Find target directory in this directory
idx := len(currentPath)
if idx > 0 {
idx++
}
target := strings.SplitN(treePath[idx:], "/", 2)[0]
for n < size {
// Read each tree entry in turn
mode, fname, sha, count, err := ParseTreeLine(batchReader, modeBuf, fnameBuf, shaBuf)
if err != nil {
return nil, err
}
n += int64(count)
// if we have found the target directory
if bytes.Equal(fname, []byte(target)) && bytes.Equal(mode, []byte("40000")) {
copy(tmpTreeID, sha)
treeID = tmpTreeID
break
}
}
if n < size {
// Discard any remaining entries in the current tree
discard := size - n
for discard > math.MaxInt32 {
_, err := batchReader.Discard(math.MaxInt32)
if err != nil {
return nil, err
}
discard -= math.MaxInt32
}
_, err := batchReader.Discard(int(discard))
if err != nil {
return nil, err
}
}
// if we haven't found a treeID for the target directory our search is over
if len(treeID) == 0 {
break treeReadingLoop
}
// add the target to the current path
if idx > 0 {
currentPath += "/"
}
currentPath += target
// if we've now found the current path check its sha id and commit status
if treePath == currentPath && paths[0] == "" {
if len(ids[0]) == 0 {
copy(allShaBuf[0:20], treeID)
ids[0] = allShaBuf[0:20]
commits[0] = string(commitID)
} else if bytes.Equal(ids[0], treeID) {
commits[0] = string(commitID)
}
}
treeID = To40ByteSHA(treeID)
_, err = batchStdinWriter.Write(treeID)
if err != nil {
return nil, err
}
_, err = batchStdinWriter.Write([]byte("\n"))
if err != nil {
return nil, err
}
}
}
commitsMap := make(map[string]*Commit, len(commits))
commitsMap[commit.ID.String()] = commit
commitCommits := make([]*Commit, len(commits))
for i, commitID := range commits {
c, ok := commitsMap[commitID]
if ok {
commitCommits[i] = c
continue
}
if len(commitID) == 0 {
continue
}
_, err := batchStdinWriter.Write([]byte(commitID + "\n"))
if err != nil {
return nil, err
}
_, typ, size, err := ReadBatchLine(batchReader)
if err != nil {
return nil, err
}
if typ != "commit" {
return nil, fmt.Errorf("unexpected type: %s for commit id: %s", typ, commitID)
}
c, err = CommitFromReader(commit.repo, MustIDFromString(string(commitID)), io.LimitReader(batchReader, int64(size)))
if err != nil {
return nil, err
}
commitCommits[i] = c
}
return commitCommits, scan.Err()
}