first-commit
This commit is contained in:
199
modules/indexer/code/git.go
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199
modules/indexer/code/git.go
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@@ -0,0 +1,199 @@
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// Copyright 2019 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package code
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import (
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"context"
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"strconv"
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"strings"
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repo_model "code.gitea.io/gitea/models/repo"
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"code.gitea.io/gitea/modules/git"
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"code.gitea.io/gitea/modules/indexer/code/internal"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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)
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func getDefaultBranchSha(ctx context.Context, repo *repo_model.Repository) (string, error) {
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stdout, _, err := git.NewCommand("show-ref", "-s").AddDynamicArguments(git.BranchPrefix+repo.DefaultBranch).RunStdString(ctx, &git.RunOpts{Dir: repo.RepoPath()})
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if err != nil {
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return "", err
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}
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return strings.TrimSpace(stdout), nil
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}
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// getRepoChanges returns changes to repo since last indexer update
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func getRepoChanges(ctx context.Context, repo *repo_model.Repository, revision string) (*internal.RepoChanges, error) {
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status, err := repo_model.GetIndexerStatus(ctx, repo, repo_model.RepoIndexerTypeCode)
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if err != nil {
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return nil, err
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}
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needGenesis := len(status.CommitSha) == 0
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if !needGenesis {
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hasAncestorCmd := git.NewCommand("merge-base").AddDynamicArguments(status.CommitSha, revision)
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stdout, _, _ := hasAncestorCmd.RunStdString(ctx, &git.RunOpts{Dir: repo.RepoPath()})
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needGenesis = len(stdout) == 0
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}
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if needGenesis {
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return genesisChanges(ctx, repo, revision)
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}
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return nonGenesisChanges(ctx, repo, revision)
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}
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func isIndexable(entry *git.TreeEntry) bool {
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if !entry.IsRegular() && !entry.IsExecutable() {
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return false
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}
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name := strings.ToLower(entry.Name())
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for _, g := range setting.Indexer.ExcludePatterns {
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if g.Match(name) {
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return false
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}
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}
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for _, g := range setting.Indexer.IncludePatterns {
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if g.Match(name) {
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return true
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}
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}
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return len(setting.Indexer.IncludePatterns) == 0
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}
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// parseGitLsTreeOutput parses the output of a `git ls-tree -r --full-name` command
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func parseGitLsTreeOutput(stdout []byte) ([]internal.FileUpdate, error) {
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entries, err := git.ParseTreeEntries(stdout)
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if err != nil {
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return nil, err
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}
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idxCount := 0
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updates := make([]internal.FileUpdate, len(entries))
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for _, entry := range entries {
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if isIndexable(entry) {
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updates[idxCount] = internal.FileUpdate{
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Filename: entry.Name(),
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BlobSha: entry.ID.String(),
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Size: entry.Size(),
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Sized: true,
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}
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idxCount++
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}
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}
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return updates[:idxCount], nil
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}
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// genesisChanges get changes to add repo to the indexer for the first time
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func genesisChanges(ctx context.Context, repo *repo_model.Repository, revision string) (*internal.RepoChanges, error) {
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var changes internal.RepoChanges
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stdout, _, runErr := git.NewCommand("ls-tree", "--full-tree", "-l", "-r").AddDynamicArguments(revision).RunStdBytes(ctx, &git.RunOpts{Dir: repo.RepoPath()})
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if runErr != nil {
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return nil, runErr
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}
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var err error
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changes.Updates, err = parseGitLsTreeOutput(stdout)
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return &changes, err
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}
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// nonGenesisChanges get changes since the previous indexer update
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func nonGenesisChanges(ctx context.Context, repo *repo_model.Repository, revision string) (*internal.RepoChanges, error) {
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diffCmd := git.NewCommand("diff", "--name-status").AddDynamicArguments(repo.CodeIndexerStatus.CommitSha, revision)
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stdout, _, runErr := diffCmd.RunStdString(ctx, &git.RunOpts{Dir: repo.RepoPath()})
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if runErr != nil {
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// previous commit sha may have been removed by a force push, so
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// try rebuilding from scratch
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log.Warn("git diff: %v", runErr)
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if err := (*globalIndexer.Load()).Delete(ctx, repo.ID); err != nil {
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return nil, err
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}
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return genesisChanges(ctx, repo, revision)
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}
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var changes internal.RepoChanges
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var err error
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updatedFilenames := make([]string, 0, 10)
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updateChanges := func() error {
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cmd := git.NewCommand("ls-tree", "--full-tree", "-l").AddDynamicArguments(revision).
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AddDashesAndList(updatedFilenames...)
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lsTreeStdout, _, err := cmd.RunStdBytes(ctx, &git.RunOpts{Dir: repo.RepoPath()})
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if err != nil {
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return err
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}
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updates, err1 := parseGitLsTreeOutput(lsTreeStdout)
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if err1 != nil {
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return err1
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}
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changes.Updates = append(changes.Updates, updates...)
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return nil
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}
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lines := strings.SplitSeq(stdout, "\n")
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for line := range lines {
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line = strings.TrimSpace(line)
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if len(line) == 0 {
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continue
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}
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fields := strings.Split(line, "\t")
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if len(fields) < 2 {
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log.Warn("Unparseable output for diff --name-status: `%s`)", line)
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continue
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}
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filename := fields[1]
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if len(filename) == 0 {
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continue
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} else if filename[0] == '"' {
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filename, err = strconv.Unquote(filename)
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if err != nil {
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return nil, err
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}
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}
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switch status := fields[0][0]; status {
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case 'M', 'A':
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updatedFilenames = append(updatedFilenames, filename)
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case 'D':
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changes.RemovedFilenames = append(changes.RemovedFilenames, filename)
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case 'R', 'C':
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if len(fields) < 3 {
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log.Warn("Unparseable output for diff --name-status: `%s`)", line)
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continue
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}
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dest := fields[2]
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if len(dest) == 0 {
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log.Warn("Unparseable output for diff --name-status: `%s`)", line)
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continue
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}
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if dest[0] == '"' {
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dest, err = strconv.Unquote(dest)
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if err != nil {
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return nil, err
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}
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}
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if status == 'R' {
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changes.RemovedFilenames = append(changes.RemovedFilenames, filename)
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}
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updatedFilenames = append(updatedFilenames, dest)
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default:
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log.Warn("Unrecognized status: %c (line=%s)", status, line)
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}
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// According to https://learn.microsoft.com/en-us/troubleshoot/windows-client/shell-experience/command-line-string-limitation#more-information
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// the command line length should less than 8191 characters, assume filepath is 256, then 8191/256 = 31, so we use 30
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if len(updatedFilenames) >= 30 {
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if err := updateChanges(); err != nil {
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return nil, err
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}
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updatedFilenames = updatedFilenames[0:0]
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}
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}
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if len(updatedFilenames) > 0 {
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if err := updateChanges(); err != nil {
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return nil, err
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}
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}
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return &changes, err
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}
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