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, 77 insertions, 0 deletions

diff --git a/modules/git/blob_nogogit.go b/modules/git/blob_nogogit.go
new file mode 100644
index 0000000000..401b172860
--- /dev/null
+++ b/modules/git/blob_nogogit.go
@@ -0,0 +1,77 @@
+// 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"
+	"io"
+	"strconv"
+	"strings"
+)
+
+// Blob represents a Git object.
+type Blob struct {
+	ID SHA1
+
+	gotSize  bool
+	size     int64
+	repoPath string
+	name     string
+}
+
+// DataAsync gets a ReadCloser for the contents of a blob without reading it all.
+// Calling the Close function on the result will discard all unread output.
+func (b *Blob) DataAsync() (io.ReadCloser, error) {
+	stdoutReader, stdoutWriter := io.Pipe()
+	var err error
+
+	go func() {
+		stderr := &strings.Builder{}
+		err = NewCommand("cat-file", "--batch").RunInDirFullPipeline(b.repoPath, stdoutWriter, stderr, strings.NewReader(b.ID.String()+"\n"))
+		if err != nil {
+			err = ConcatenateError(err, stderr.String())
+			_ = stdoutWriter.CloseWithError(err)
+		} else {
+			_ = stdoutWriter.Close()
+		}
+	}()
+
+	bufReader := bufio.NewReader(stdoutReader)
+	_, _, size, err := ReadBatchLine(bufReader)
+	if err != nil {
+		stdoutReader.Close()
+		return nil, err
+	}
+
+	return &LimitedReaderCloser{
+		R: bufReader,
+		C: stdoutReader,
+		N: int64(size),
+	}, err
+}
+
+// Size returns the uncompressed size of the blob
+func (b *Blob) Size() int64 {
+	if b.gotSize {
+		return b.size
+	}
+
+	size, err := NewCommand("cat-file", "-s", b.ID.String()).RunInDir(b.repoPath)
+	if err != nil {
+		log("error whilst reading size for %s in %s. Error: %v", b.ID.String(), b.repoPath, err)
+		return 0
+	}
+
+	b.size, err = strconv.ParseInt(size[:len(size)-1], 10, 64)
+	if err != nil {
+		log("error whilst parsing size %s for %s in %s. Error: %v", size, b.ID.String(), b.repoPath, err)
+		return 0
+	}
+	b.gotSize = true
+
+	return b.size
+}