Godeps, vendor: convert dependency management to trash (#3198)

This commit converts the dependency management from Godeps to the vendor
folder, also switching the tool from godep to trash. Since the upstream tool
lacks a few features proposed via a few PRs, until those PRs are merged in
(if), use github.com/karalabe/trash.

You can update dependencies via trash --update.

All dependencies have been updated to their latest version.

Parts of the build system are reworked to drop old notions of Godeps and
invocation of the go vet command so that it doesn't run against the vendor
folder, as that will just blow up during vetting.

The conversion drops OpenCL (and hence GPU mining support) from ethash and our
codebase. The short reasoning is that there's noone to maintain and having
opencl libs in our deps messes up builds as go install ./... tries to build
them, failing with unsatisfied link errors for the C OpenCL deps.

golang.org/x/net/context is not vendored in. We expect it to be fetched by the
user (i.e. using go get). To keep ci.go builds reproducible the package is
"vendored" in build/_vendor.

1 files changed, 208 insertions, 0 deletions

diff --git a/vendor/github.com/syndtr/goleveldb/leveldb/session.go b/vendor/github.com/syndtr/goleveldb/leveldb/session.go
new file mode 100644
index 000000000..f3e747701
--- /dev/null
+++ b/vendor/github.com/syndtr/goleveldb/leveldb/session.go
@@ -0,0 +1,208 @@
+// Copyright (c) 2012, Suryandaru Triandana <syndtr@gmail.com>
+// All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package leveldb
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"sync"
+
+	"github.com/syndtr/goleveldb/leveldb/errors"
+	"github.com/syndtr/goleveldb/leveldb/journal"
+	"github.com/syndtr/goleveldb/leveldb/opt"
+	"github.com/syndtr/goleveldb/leveldb/storage"
+)
+
+// ErrManifestCorrupted records manifest corruption. This error will be
+// wrapped with errors.ErrCorrupted.
+type ErrManifestCorrupted struct {
+	Field  string
+	Reason string
+}
+
+func (e *ErrManifestCorrupted) Error() string {
+	return fmt.Sprintf("leveldb: manifest corrupted (field '%s'): %s", e.Field, e.Reason)
+}
+
+func newErrManifestCorrupted(fd storage.FileDesc, field, reason string) error {
+	return errors.NewErrCorrupted(fd, &ErrManifestCorrupted{field, reason})
+}
+
+// session represent a persistent database session.
+type session struct {
+	// Need 64-bit alignment.
+	stNextFileNum    int64 // current unused file number
+	stJournalNum     int64 // current journal file number; need external synchronization
+	stPrevJournalNum int64 // prev journal file number; no longer used; for compatibility with older version of leveldb
+	stTempFileNum    int64
+	stSeqNum         uint64 // last mem compacted seq; need external synchronization
+
+	stor     storage.Storage
+	storLock storage.Locker
+	o        *cachedOptions
+	icmp     *iComparer
+	tops     *tOps
+
+	manifest       *journal.Writer
+	manifestWriter storage.Writer
+	manifestFd     storage.FileDesc
+
+	stCompPtrs []internalKey // compaction pointers; need external synchronization
+	stVersion  *version      // current version
+	vmu        sync.Mutex
+}
+
+// Creates new initialized session instance.
+func newSession(stor storage.Storage, o *opt.Options) (s *session, err error) {
+	if stor == nil {
+		return nil, os.ErrInvalid
+	}
+	storLock, err := stor.Lock()
+	if err != nil {
+		return
+	}
+	s = &session{
+		stor:     stor,
+		storLock: storLock,
+	}
+	s.setOptions(o)
+	s.tops = newTableOps(s)
+	s.setVersion(newVersion(s))
+	s.log("log@legend F·NumFile S·FileSize N·Entry C·BadEntry B·BadBlock Ke·KeyError D·DroppedEntry L·Level Q·SeqNum T·TimeElapsed")
+	return
+}
+
+// Close session.
+func (s *session) close() {
+	s.tops.close()
+	if s.manifest != nil {
+		s.manifest.Close()
+	}
+	if s.manifestWriter != nil {
+		s.manifestWriter.Close()
+	}
+	s.manifest = nil
+	s.manifestWriter = nil
+	s.setVersion(&version{s: s, closing: true})
+}
+
+// Release session lock.
+func (s *session) release() {
+	s.storLock.Unlock()
+}
+
+// Create a new database session; need external synchronization.
+func (s *session) create() error {
+	// create manifest
+	return s.newManifest(nil, nil)
+}
+
+// Recover a database session; need external synchronization.
+func (s *session) recover() (err error) {
+	defer func() {
+		if os.IsNotExist(err) {
+			// Don't return os.ErrNotExist if the underlying storage contains
+			// other files that belong to LevelDB. So the DB won't get trashed.
+			if fds, _ := s.stor.List(storage.TypeAll); len(fds) > 0 {
+				err = &errors.ErrCorrupted{Fd: storage.FileDesc{Type: storage.TypeManifest}, Err: &errors.ErrMissingFiles{}}
+			}
+		}
+	}()
+
+	fd, err := s.stor.GetMeta()
+	if err != nil {
+		return
+	}
+
+	reader, err := s.stor.Open(fd)
+	if err != nil {
+		return
+	}
+	defer reader.Close()
+
+	var (
+		// Options.
+		strict = s.o.GetStrict(opt.StrictManifest)
+
+		jr      = journal.NewReader(reader, dropper{s, fd}, strict, true)
+		rec     = &sessionRecord{}
+		staging = s.stVersion.newStaging()
+	)
+	for {
+		var r io.Reader
+		r, err = jr.Next()
+		if err != nil {
+			if err == io.EOF {
+				err = nil
+				break
+			}
+			return errors.SetFd(err, fd)
+		}
+
+		err = rec.decode(r)
+		if err == nil {
+			// save compact pointers
+			for _, r := range rec.compPtrs {
+				s.setCompPtr(r.level, internalKey(r.ikey))
+			}
+			// commit record to version staging
+			staging.commit(rec)
+		} else {
+			err = errors.SetFd(err, fd)
+			if strict || !errors.IsCorrupted(err) {
+				return
+			}
+			s.logf("manifest error: %v (skipped)", errors.SetFd(err, fd))
+		}
+		rec.resetCompPtrs()
+		rec.resetAddedTables()
+		rec.resetDeletedTables()
+	}
+
+	switch {
+	case !rec.has(recComparer):
+		return newErrManifestCorrupted(fd, "comparer", "missing")
+	case rec.comparer != s.icmp.uName():
+		return newErrManifestCorrupted(fd, "comparer", fmt.Sprintf("mismatch: want '%s', got '%s'", s.icmp.uName(), rec.comparer))
+	case !rec.has(recNextFileNum):
+		return newErrManifestCorrupted(fd, "next-file-num", "missing")
+	case !rec.has(recJournalNum):
+		return newErrManifestCorrupted(fd, "journal-file-num", "missing")
+	case !rec.has(recSeqNum):
+		return newErrManifestCorrupted(fd, "seq-num", "missing")
+	}
+
+	s.manifestFd = fd
+	s.setVersion(staging.finish())
+	s.setNextFileNum(rec.nextFileNum)
+	s.recordCommited(rec)
+	return nil
+}
+
+// Commit session; need external synchronization.
+func (s *session) commit(r *sessionRecord) (err error) {
+	v := s.version()
+	defer v.release()
+
+	// spawn new version based on current version
+	nv := v.spawn(r)
+
+	if s.manifest == nil {
+		// manifest journal writer not yet created, create one
+		err = s.newManifest(r, nv)
+	} else {
+		err = s.flushManifest(r)
+	}
+
+	// finally, apply new version if no error rise
+	if err == nil {
+		s.setVersion(nv)
+	}
+
+	return
+}