Git LFS support v2 (#122)

* Import github.com/git-lfs/lfs-test-server as lfs module base

Imported commit is 3968aac269a77b73924649b9412ae03f7ccd3198

Removed:

Dockerfile CONTRIBUTING.md mgmt* script/ vendor/ kvlogger.go
.dockerignore .gitignore README.md

* Remove config, add JWT support from github.com/mgit-at/lfs-test-server

Imported commit f0cdcc5a01599c5a955dc1bbf683bb4acecdba83

* Add LFS settings

* Add LFS meta object model

* Add LFS routes and initialization

* Import github.com/dgrijalva/jwt-go into vendor/

* Adapt LFS module: handlers, routing, meta store

* Move LFS routes to /user/repo/info/lfs/*

* Add request header checks to LFS BatchHandler / PostHandler

* Implement LFS basic authentication

* Rework JWT secret generation / load

* Implement LFS SSH token authentication with JWT

Specification: https://github.com/github/git-lfs/tree/master/docs/api

* Integrate LFS settings into install process

* Remove LFS objects when repository is deleted

Only removes objects from content store when deleted repo is the only
referencing repository

* Make LFS module stateless

Fixes bug where LFS would not work after installation without
restarting Gitea

* Change 500 'Internal Server Error' to 400 'Bad Request'

* Change sql query to xorm call

* Remove unneeded type from LFS module

* Change internal imports to code.gitea.io/gitea/

* Add Gitea authors copyright

* Change basic auth realm to "gitea-lfs"

* Add unique indexes to LFS model

* Use xorm count function in LFS check on repository delete

* Return io.ReadCloser from content store and close after usage

* Add LFS info to runWeb()

* Export LFS content store base path

* LFS file download from UI

* Work around git-lfs client issue with unauthenticated requests

Returning a dummy Authorization header for unauthenticated requests
lets git-lfs client skip asking for auth credentials
See: https://github.com/github/git-lfs/issues/1088

* Fix unauthenticated UI downloads from public repositories

* Authentication check order, Finish LFS file view logic

* Ignore LFS hooks if installed for current OS user

Fixes Gitea UI actions for repositories tracking LFS files.
Checks for minimum needed git version by parsing the semantic version
string.

* Hide LFS metafile diff from commit view, marking as binary

* Show LFS notice if file in commit view is tracked

* Add notbefore/nbf JWT claim

* Correct lint suggestions - comments for structs and functions

- Add comments to LFS model
- Function comment for GetRandomBytesAsBase64
- LFS server function comments and lint variable suggestion

* Move secret generation code out of conditional

Ensures no LFS code may run with an empty secret

* Do not hand out JWT tokens if LFS server support is disabled

models/repo.go

@@ -1480,6 +1480,35 @@ func DeleteRepository(uid, repoID int64) error {
 		RemoveAllWithNotice("Delete attachment", attachmentPaths[i])
 	}
 
+	// Remove LFS objects
+	var lfsObjects []*LFSMetaObject
+
+	if err = sess.Where("repository_id=?", repoID).Find(&lfsObjects); err != nil {
+		return err
+	}
+
+	for _, v := range lfsObjects {
+		count, err := sess.Count(&LFSMetaObject{Oid: v.Oid})
+
+		if err != nil {
+			return err
+		}
+
+		if count > 1 {
+			continue
+		}
+
+		oidPath := filepath.Join(v.Oid[0:2], v.Oid[2:4], v.Oid[4:len(v.Oid)])
+		err = os.Remove(filepath.Join(setting.LFS.ContentPath, oidPath))
+		if err != nil {
+			return err
+		}
+	}
+
+	if _, err := sess.Delete(&LFSMetaObject{RepositoryID: repoID}); err != nil {
+		return err
+	}
+
 	if err = sess.Commit(); err != nil {
 		return fmt.Errorf("Commit: %v", err)
 	}
@@ -2240,6 +2269,34 @@ func ForkRepository(u *User, oldRepo *Repository, name, desc string) (_ *Reposit
 		return nil, fmt.Errorf("createUpdateHook: %v", err)
 	}
 
+	//Commit repo to get Fork ID
+	err = sess.Commit()
+	if err != nil {
+		return nil, err
+	}
+	sessionRelease(sess)
+
+	// Copy LFS meta objects in new session
+	sess = x.NewSession()
+	defer sessionRelease(sess)
+	if err = sess.Begin(); err != nil {
+		return nil, err
+	}
+
+	var lfsObjects []*LFSMetaObject
+
+	if err = sess.Where("repository_id=?", oldRepo.ID).Find(&lfsObjects); err != nil {
+		return nil, err
+	}
+
+	for _, v := range lfsObjects {
+		v.ID = 0
+		v.RepositoryID = repo.ID
+		if _, err = sess.Insert(v); err != nil {
+			return nil, err
+		}
+	}
+
 	return repo, sess.Commit()
 }