Add LFS Migration and Mirror (#14726)

* Implemented LFS client.

* Implemented scanning for pointer files.

* Implemented downloading of lfs files.

* Moved model-dependent code into services.

* Removed models dependency. Added TryReadPointerFromBuffer.

* Migrated code from service to module.

* Centralised storage creation.

* Removed dependency from models.

* Moved ContentStore into modules.

* Share structs between server and client.

* Moved method to services.

* Implemented lfs download on clone.

* Implemented LFS sync on clone and mirror update.

* Added form fields.

* Updated templates.

* Fixed condition.

* Use alternate endpoint.

* Added missing methods.

* Fixed typo and make linter happy.

* Detached pointer parser from gogit dependency.

* Fixed TestGetLFSRange test.

* Added context to support cancellation.

* Use ReadFull to probably read more data.

* Removed duplicated code from models.

* Moved scan implementation into pointer_scanner_nogogit.

* Changed method name.

* Added comments.

* Added more/specific log/error messages.

* Embedded lfs.Pointer into models.LFSMetaObject.

* Moved code from models to module.

* Moved code from models to module.

* Moved code from models to module.

* Reduced pointer usage.

* Embedded type.

* Use promoted fields.

* Fixed unexpected eof.

* Added unit tests.

* Implemented migration of local file paths.

* Show an error on invalid LFS endpoints.

* Hide settings if not used.

* Added LFS info to mirror struct.

* Fixed comment.

* Check LFS endpoint.

* Manage LFS settings from mirror page.

* Fixed selector.

* Adjusted selector.

* Added more tests.

* Added local filesystem migration test.

* Fixed typo.

* Reset settings.

* Added special windows path handling.

* Added unit test for HTTPClient.

* Added unit test for BasicTransferAdapter.

* Moved into util package.

* Test if LFS endpoint is allowed.

* Added support for git://

* Just use a static placeholder as the displayed url may be invalid.

* Reverted to original code.

* Added "Advanced Settings".

* Updated wording.

* Added discovery info link.

* Implemented suggestion.

* Fixed missing format parameter.

* Added Pointer.IsValid().

* Always remove model on error.

* Added suggestions.

* Use channel instead of array.

* Update routers/repo/migrate.go

* fmt

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

Co-authored-by: zeripath <art27@cantab.net>

1 files changed, 50 insertions, 0 deletions

diff --git a/modules/lfs/filesystem_client.go b/modules/lfs/filesystem_client.go
new file mode 100644
index 0000000000..3a51564a82
--- /dev/null
+++ b/modules/lfs/filesystem_client.go
@@ -0,0 +1,50 @@
+// Copyright 2021 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.
+
+package lfs
+
+import (
+	"context"
+	"io"
+	"net/url"
+	"os"
+	"path/filepath"
+
+	"code.gitea.io/gitea/modules/util"
+)
+
+// FilesystemClient is used to read LFS data from a filesystem path
+type FilesystemClient struct {
+	lfsdir string
+}
+
+func newFilesystemClient(endpoint *url.URL) *FilesystemClient {
+	path, _ := util.FileURLToPath(endpoint)
+
+	lfsdir := filepath.Join(path, "lfs", "objects")
+
+	client := &FilesystemClient{lfsdir}
+
+	return client
+}
+
+func (c *FilesystemClient) objectPath(oid string) string {
+	return filepath.Join(c.lfsdir, oid[0:2], oid[2:4], oid)
+}
+
+// Download reads the specific LFS object from the target repository
+func (c *FilesystemClient) Download(ctx context.Context, oid string, size int64) (io.ReadCloser, error) {
+	objectPath := c.objectPath(oid)
+
+	if _, err := os.Stat(objectPath); os.IsNotExist(err) {
+		return nil, err
+	}
+
+	file, err := os.Open(objectPath)
+	if err != nil {
+		return nil, err
+	}
+
+	return file, nil
+}