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, 106 insertions, 0 deletions

diff --git a/modules/lfs/endpoint.go b/modules/lfs/endpoint.go
new file mode 100644
index 0000000000..add16ce9f1
--- /dev/null
+++ b/modules/lfs/endpoint.go
@@ -0,0 +1,106 @@
+// 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 (
+	"fmt"
+	"net/url"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+
+	"code.gitea.io/gitea/modules/log"
+)
+
+// DetermineEndpoint determines an endpoint from the clone url or uses the specified LFS url.
+func DetermineEndpoint(cloneurl, lfsurl string) *url.URL {
+	if len(lfsurl) > 0 {
+		return endpointFromURL(lfsurl)
+	}
+	return endpointFromCloneURL(cloneurl)
+}
+
+func endpointFromCloneURL(rawurl string) *url.URL {
+	ep := endpointFromURL(rawurl)
+	if ep == nil {
+		return ep
+	}
+
+	if strings.HasSuffix(ep.Path, "/") {
+		ep.Path = ep.Path[:len(ep.Path)-1]
+	}
+
+	if ep.Scheme == "file" {
+		return ep
+	}
+
+	if path.Ext(ep.Path) == ".git" {
+		ep.Path += "/info/lfs"
+	} else {
+		ep.Path += ".git/info/lfs"
+	}
+
+	return ep
+}
+
+func endpointFromURL(rawurl string) *url.URL {
+	if strings.HasPrefix(rawurl, "/") {
+		return endpointFromLocalPath(rawurl)
+	}
+
+	u, err := url.Parse(rawurl)
+	if err != nil {
+		log.Error("lfs.endpointFromUrl: %v", err)
+		return nil
+	}
+
+	switch u.Scheme {
+	case "http", "https":
+		return u
+	case "git":
+		u.Scheme = "https"
+		return u
+	case "file":
+		return u
+	default:
+		if _, err := os.Stat(rawurl); err == nil {
+			return endpointFromLocalPath(rawurl)
+		}
+
+		log.Error("lfs.endpointFromUrl: unknown url")
+		return nil
+	}
+}
+
+func endpointFromLocalPath(path string) *url.URL {
+	var slash string
+	if abs, err := filepath.Abs(path); err == nil {
+		if !strings.HasPrefix(abs, "/") {
+			slash = "/"
+		}
+		path = abs
+	}
+
+	var gitpath string
+	if filepath.Base(path) == ".git" {
+		gitpath = path
+		path = filepath.Dir(path)
+	} else {
+		gitpath = filepath.Join(path, ".git")
+	}
+
+	if _, err := os.Stat(gitpath); err == nil {
+		path = gitpath
+	} else if _, err := os.Stat(path); err != nil {
+		return nil
+	}
+
+	path = fmt.Sprintf("file://%s%s", slash, filepath.ToSlash(path))
+
+	u, _ := url.Parse(path)
+
+	return u
+}