Use native git variants by default with go-git variants as build tag (#13673)

* Move last commit cache back into modules/git

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Remove go-git from the interface for last commit cache

Signed-off-by: Andrew Thornton <art27@cantab.net>

* move cacheref to last_commit_cache

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Remove go-git from routers/private/hook

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Move FindLFSFiles to pipeline

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Make no-go-git variants

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Submodule RefID

Signed-off-by: Andrew Thornton <art27@cantab.net>

* fix issue with GetCommitsInfo

Signed-off-by: Andrew Thornton <art27@cantab.net>

* fix GetLastCommitForPaths

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Improve efficiency

Signed-off-by: Andrew Thornton <art27@cantab.net>

* More efficiency

Signed-off-by: Andrew Thornton <art27@cantab.net>

* even faster

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Reduce duplication

* As per @lunny

Signed-off-by: Andrew Thornton <art27@cantab.net>

* attempt to fix drone

Signed-off-by: Andrew Thornton <art27@cantab.net>

* fix test-tags

Signed-off-by: Andrew Thornton <art27@cantab.net>

* default to use no-go-git variants and add gogit build tag

Signed-off-by: Andrew Thornton <art27@cantab.net>

* placate lint

Signed-off-by: Andrew Thornton <art27@cantab.net>

* as per @6543

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

1 files changed, 109 insertions, 0 deletions

diff --git a/modules/git/repo_commit_nogogit.go b/modules/git/repo_commit_nogogit.go
new file mode 100644
index 0000000000..a43fe4b334
--- /dev/null
+++ b/modules/git/repo_commit_nogogit.go
@@ -0,0 +1,109 @@
+// Copyright 2020 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"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"strings"
+)
+
+// ResolveReference resolves a name to a reference
+func (repo *Repository) ResolveReference(name string) (string, error) {
+	stdout, err := NewCommand("show-ref", "--hash", name).RunInDir(repo.Path)
+	if err != nil {
+		if strings.Contains(err.Error(), "not a valid ref") {
+			return "", ErrNotExist{name, ""}
+		}
+		return "", err
+	}
+	stdout = strings.TrimSpace(stdout)
+	if stdout == "" {
+		return "", ErrNotExist{name, ""}
+	}
+
+	return stdout, nil
+}
+
+// GetRefCommitID returns the last commit ID string of given reference (branch or tag).
+func (repo *Repository) GetRefCommitID(name string) (string, error) {
+	stdout, err := NewCommand("show-ref", "--verify", "--hash", name).RunInDir(repo.Path)
+	if err != nil {
+		if strings.Contains(err.Error(), "not a valid ref") {
+			return "", ErrNotExist{name, ""}
+		}
+		return "", err
+	}
+
+	return strings.TrimSpace(stdout), nil
+}
+
+// IsCommitExist returns true if given commit exists in current repository.
+func (repo *Repository) IsCommitExist(name string) bool {
+	_, err := NewCommand("cat-file", "-e", name).RunInDir(repo.Path)
+	return err == nil
+}
+
+func (repo *Repository) getCommit(id SHA1) (*Commit, error) {
+	stdoutReader, stdoutWriter := io.Pipe()
+	defer func() {
+		_ = stdoutReader.Close()
+		_ = stdoutWriter.Close()
+	}()
+
+	go func() {
+		stderr := strings.Builder{}
+		err := NewCommand("cat-file", "--batch").RunInDirFullPipeline(repo.Path, stdoutWriter, &stderr, strings.NewReader(id.String()+"\n"))
+		if err != nil {
+			_ = stdoutWriter.CloseWithError(ConcatenateError(err, (&stderr).String()))
+		} else {
+			_ = stdoutWriter.Close()
+		}
+	}()
+
+	bufReader := bufio.NewReader(stdoutReader)
+	_, typ, size, err := ReadBatchLine(bufReader)
+	if err != nil {
+		return nil, err
+	}
+
+	switch typ {
+	case "tag":
+		// then we need to parse the tag
+		// and load the commit
+		data, err := ioutil.ReadAll(io.LimitReader(bufReader, size))
+		if err != nil {
+			return nil, err
+		}
+		tag, err := parseTagData(data)
+		if err != nil {
+			return nil, err
+		}
+		tag.repo = repo
+
+		commit, err := tag.Commit()
+		if err != nil {
+			return nil, err
+		}
+
+		commit.CommitMessage = strings.TrimSpace(tag.Message)
+		commit.Author = tag.Tagger
+		commit.Signature = tag.Signature
+
+		return commit, nil
+	case "commit":
+		return CommitFromReader(repo, id, io.LimitReader(bufReader, size))
+	default:
+		_ = stdoutReader.CloseWithError(fmt.Errorf("unknown typ: %s", typ))
+		log("Unknown typ: %s", typ)
+		return nil, ErrNotExist{
+			ID: id.String(),
+		}
+	}
+}