golang 1.12.0 (#3376)

- update docker image on circleci
 - remove GOCACHE=off from Makefile (see:
 https://tip.golang.org/doc/go1.12#gocache)
 - update badge in readme
 - update in scripts/install
 - update Vagrantfile
 - update in networks/remote/integration.sh
 - tools/build/Makefile

.circleci/config.yml

@@ -3,7 +3,7 @@ version: 2
 defaults: &defaults
   working_directory: /go/src/github.com/tendermint/tendermint
   docker:
-    - image: circleci/golang:1.11.4
+    - image: circleci/golang:1.12.0
   environment:
     GOBIN: /tmp/workspace/bin
 
@@ -154,7 +154,7 @@ jobs:
             for pkg in $(go list github.com/tendermint/tendermint/... | circleci tests split --split-by=timings); do
               id=$(basename "$pkg")
 
-              GOCACHE=off go test -v -timeout 5m -race -coverprofile=/tmp/workspace/profiles/$id.out -covermode=atomic "$pkg" | tee "/tmp/logs/$id-$RANDOM.log"
+              go test -v -timeout 5m -race -coverprofile=/tmp/workspace/profiles/$id.out -covermode=atomic "$pkg" | tee "/tmp/logs/$id-$RANDOM.log"
             done
       - persist_to_workspace:
           root: /tmp/workspace

Makefile

@@ -131,7 +131,7 @@ clean_certs:
 	rm -f db/remotedb/::.crt db/remotedb/::.key
 
 test_libs: gen_certs
-	GOCACHE=off go test -tags gcc $(PACKAGES)
+	go test -tags gcc $(PACKAGES)
 	make clean_certs
 
 grpc_dbserver:
@@ -214,11 +214,11 @@ vagrant_test:
 ### go tests
 test:
 	@echo "--> Running go test"
-	@GOCACHE=off go test -p 1 $(PACKAGES)
+	go test -p 1 $(PACKAGES)
 
 test_race:
 	@echo "--> Running go test --race"
-	@GOCACHE=off go test -p 1 -v -race $(PACKAGES)
+	go test -p 1 -v -race $(PACKAGES)
 
 # uses https://github.com/sasha-s/go-deadlock/ to detect potential deadlocks
 test_with_deadlock:

README.md

@@ -8,7 +8,7 @@ Or [Blockchain](https://en.wikipedia.org/wiki/Blockchain_(database)), for short.
 [![API Reference](
 https://camo.githubusercontent.com/915b7be44ada53c290eb157634330494ebe3e30a/68747470733a2f2f676f646f632e6f72672f6769746875622e636f6d2f676f6c616e672f6764646f3f7374617475732e737667
 )](https://godoc.org/github.com/tendermint/tendermint)
-[![Go version](https://img.shields.io/badge/go-1.10.4-blue.svg)](https://github.com/moovweb/gvm)
+[![Go version](https://img.shields.io/badge/go-1.12.0-blue.svg)](https://github.com/moovweb/gvm)
 [![riot.im](https://img.shields.io/badge/riot.im-JOIN%20CHAT-green.svg)](https://riot.im/app/#/room/#tendermint:matrix.org)
 [![license](https://img.shields.io/github/license/tendermint/tendermint.svg)](https://github.com/tendermint/tendermint/blob/master/LICENSE)
 [![](https://tokei.rs/b1/github/tendermint/tendermint?category=lines)](https://github.com/tendermint/tendermint)

Vagrantfile

@@ -29,10 +29,10 @@ Vagrant.configure("2") do |config|
     usermod -a -G docker vagrant
 
     # install go
-    wget -q https://dl.google.com/go/go1.11.linux-amd64.tar.gz
-    tar -xvf go1.11.linux-amd64.tar.gz
+    wget -q https://dl.google.com/go/go1.12.linux-amd64.tar.gz
+    tar -xvf go1.12.linux-amd64.tar.gz
     mv go /usr/local
-    rm -f go1.11.linux-amd64.tar.gz
+    rm -f go1.12.linux-amd64.tar.gz
 
     # install nodejs (for docs)
     curl -sL https://deb.nodesource.com/setup_11.x | bash -

networks/remote/integration.sh

@@ -10,8 +10,8 @@ sudo apt-get upgrade -y
 sudo apt-get install -y jq unzip python-pip software-properties-common make
 
 # get and unpack golang
-curl -O https://storage.googleapis.com/golang/go1.10.linux-amd64.tar.gz
-tar -xvf go1.10.linux-amd64.tar.gz
+curl -O https://storage.googleapis.com/golang/go1.12.linux-amd64.tar.gz
+tar -xvf go1.12.linux-amd64.tar.gz
 
 ## move binary and add to path
 mv go /usr/local

scripts/install/install_tendermint_arm.sh

@@ -5,7 +5,7 @@ REPO=github.com/tendermint/tendermint
 # change this to a specific release or branch
 BRANCH=master
 
-GO_VERSION=1.11.4
+GO_VERSION=1.12.0
 
 sudo apt-get update -y
 

scripts/install/install_tendermint_bsd.sh

@@ -16,7 +16,7 @@
 set BRANCH=master
 set REPO=github.com/tendermint/tendermint
 
-set GO_VERSION=1.11.4
+set GO_VERSION=1.12.0
 
 sudo pkg update
 

scripts/install/install_tendermint_ubuntu.sh

@@ -13,7 +13,7 @@ REPO=github.com/tendermint/tendermint
 # change this to a specific release or branch
 BRANCH=master
 
-GO_VERSION=1.11.4
+GO_VERSION=1.12.0
 
 sudo apt-get update -y
 sudo apt-get install -y make

tools/build/Makefile

@@ -4,7 +4,7 @@
 
 requirements_check = true
 gpg_check = false
-go_min_version = 1.9.4
+go_min_version = 1.12.0
 gpg_key = 2122CBE9
 
 ifeq ($(requirements_check),true)