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.

4 files changed, 13 insertions, 158 deletions

diff --git a/eth/api.go b/eth/api.go
index c2fdbe99c..48f512b1b 100644
--- a/eth/api.go
+++ b/eth/api.go
@@ -102,7 +102,7 @@ func (s *PublicMinerAPI) SubmitWork(nonce rpc.HexNumber, solution, digest common
 // result[2], 32 bytes hex encoded boundary condition ("target"), 2^256/difficulty
 func (s *PublicMinerAPI) GetWork() (work [3]string, err error) {
 	if !s.e.IsMining() {
-		if err := s.e.StartMining(0, ""); err != nil {
+		if err := s.e.StartMining(0); err != nil {
 			return work, err
 		}
 	}
@@ -141,7 +141,7 @@ func (s *PrivateMinerAPI) Start(threads *rpc.HexNumber) (bool, error) {
 		threads = rpc.NewHexNumber(runtime.NumCPU())
 	}
 
-	err := s.e.StartMining(threads.Int(), "")
+	err := s.e.StartMining(threads.Int())
 	if err == nil {
 		return true, nil
 	}
diff --git a/eth/backend.go b/eth/backend.go
index c4a883c9e..24419d6d8 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -362,6 +362,17 @@ func (self *Ethereum) SetEtherbase(etherbase common.Address) {
 	self.miner.SetEtherbase(etherbase)
 }
 
+func (s *Ethereum) StartMining(threads int) error {
+	eb, err := s.Etherbase()
+	if err != nil {
+		err = fmt.Errorf("Cannot start mining without etherbase address: %v", err)
+		glog.V(logger.Error).Infoln(err)
+		return err
+	}
+	go s.miner.Start(eb, threads)
+	return nil
+}
+
 func (s *Ethereum) StopMining()         { s.miner.Stop() }
 func (s *Ethereum) IsMining() bool      { return s.miner.Mining() }
 func (s *Ethereum) Miner() *miner.Miner { return s.miner }
diff --git a/eth/cpu_mining.go b/eth/cpu_mining.go
deleted file mode 100644
index 3469d394e..000000000
--- a/eth/cpu_mining.go
+++ /dev/null
@@ -1,54 +0,0 @@
-// Copyright 2015 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-// +build !opencl
-
-package eth
-
-import (
-	"errors"
-	"fmt"
-
-	"github.com/ethereum/go-ethereum/logger"
-	"github.com/ethereum/go-ethereum/logger/glog"
-)
-
-const disabledInfo = "Set GO_OPENCL and re-build to enable."
-
-func (s *Ethereum) StartMining(threads int, gpus string) error {
-	eb, err := s.Etherbase()
-	if err != nil {
-		err = fmt.Errorf("Cannot start mining without etherbase address: %v", err)
-		glog.V(logger.Error).Infoln(err)
-		return err
-	}
-
-	if gpus != "" {
-		return errors.New("GPU mining disabled. " + disabledInfo)
-	}
-
-	// CPU mining
-	go s.miner.Start(eb, threads)
-	return nil
-}
-
-func GPUBench(gpuid uint64) {
-	fmt.Println("GPU mining disabled. " + disabledInfo)
-}
-
-func PrintOpenCLDevices() {
-	fmt.Println("OpenCL disabled. " + disabledInfo)
-}
diff --git a/eth/gpu_mining.go b/eth/gpu_mining.go
deleted file mode 100644
index 12fa74601..000000000
--- a/eth/gpu_mining.go
+++ /dev/null
@@ -1,102 +0,0 @@
-// Copyright 2015 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-// +build opencl
-
-package eth
-
-import (
-	"fmt"
-	"math/big"
-	"strconv"
-	"strings"
-	"time"
-
-	"github.com/ethereum/ethash"
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/ethereum/go-ethereum/logger"
-	"github.com/ethereum/go-ethereum/logger/glog"
-	"github.com/ethereum/go-ethereum/miner"
-)
-
-func (s *Ethereum) StartMining(threads int, gpus string) error {
-	eb, err := s.Etherbase()
-	if err != nil {
-		err = fmt.Errorf("Cannot start mining without etherbase address: %v", err)
-		glog.V(logger.Error).Infoln(err)
-		return err
-	}
-
-	// GPU mining
-	if gpus != "" {
-		var ids []int
-		for _, s := range strings.Split(gpus, ",") {
-			i, err := strconv.Atoi(s)
-			if err != nil {
-				return fmt.Errorf("Invalid GPU id(s): %v", err)
-			}
-			if i < 0 {
-				return fmt.Errorf("Invalid GPU id: %v", i)
-			}
-			ids = append(ids, i)
-		}
-
-		// TODO: re-creating miner is a bit ugly
-		s.miner = miner.New(s, s.chainConfig, s.EventMux(), ethash.NewCL(ids))
-		go s.miner.Start(eb, len(ids))
-		return nil
-	}
-
-	// CPU mining
-	go s.miner.Start(eb, threads)
-	return nil
-}
-
-func GPUBench(gpuid uint64) {
-	e := ethash.NewCL([]int{int(gpuid)})
-
-	var h common.Hash
-	bogoHeader := &types.Header{
-		ParentHash: h,
-		Number:     big.NewInt(int64(42)),
-		Difficulty: big.NewInt(int64(999999999999999)),
-	}
-	bogoBlock := types.NewBlock(bogoHeader, nil, nil, nil)
-
-	err := ethash.InitCL(bogoBlock.NumberU64(), e)
-	if err != nil {
-		fmt.Println("OpenCL init error: ", err)
-		return
-	}
-
-	stopChan := make(chan struct{})
-	reportHashRate := func() {
-		for {
-			time.Sleep(3 * time.Second)
-			fmt.Printf("hashes/s : %v\n", e.GetHashrate())
-		}
-	}
-	fmt.Printf("Starting benchmark (%v seconds)\n", 60)
-	go reportHashRate()
-	go e.Search(bogoBlock, stopChan, 0)
-	time.Sleep(60 * time.Second)
-	fmt.Println("OK.")
-}
-
-func PrintOpenCLDevices() {
-	ethash.PrintDevices()
-}