Move dependencies of tools package to a tools directory

Makefile

@@ -1,10 +1,11 @@
 EXAMPLES := $(shell ./get_main_pkgs.sh ./example)
+TOOLS_MOD_DIR := ./tools
 
 # All source code and documents. Used in spell check.
 ALL_DOCS := $(shell find . -name '*.md' -type f | sort)
-# All directories with go.mod files. Used in go mod tidy.
-ALL_GO_MOD_DIRS := $(shell find . -type f -name 'go.mod' -exec dirname {} \; | sort)
-ALL_COVERAGE_MOD_DIRS := $(shell find . -type f -name 'go.mod' -exec dirname {} \; | egrep -v '^./example' | sort)
+# All directories with go.mod files related to opentelemetry library. Used for building, testing and linting.
+ALL_GO_MOD_DIRS := $(filter-out $(TOOLS_MOD_DIR), $(shell find . -type f -name 'go.mod' -exec dirname {} \; | sort))
+ALL_COVERAGE_MOD_DIRS := $(shell find . -type f -name 'go.mod' -exec dirname {} \; | egrep -v '^./example|^$(TOOLS_MOD_DIR)' | sort)
 
 GOTEST_MIN = go test -v -timeout 30s
 GOTEST = $(GOTEST_MIN) -race
@@ -14,15 +15,18 @@ GOTEST_WITH_COVERAGE = $(GOTEST) -coverprofile=coverage.txt -covermode=atomic
 
 .PHONY: precommit
 
-TOOLS_DIR := ./.tools
+TOOLS_DIR := $(abspath ./.tools)
 
-$(TOOLS_DIR)/golangci-lint: go.mod go.sum tools.go
+$(TOOLS_DIR)/golangci-lint: $(TOOLS_MOD_DIR)/go.mod $(TOOLS_MOD_DIR)/go.sum $(TOOLS_MOD_DIR)/tools.go
+	cd $(TOOLS_MOD_DIR) && \
 	go build -o $(TOOLS_DIR)/golangci-lint github.com/golangci/golangci-lint/cmd/golangci-lint
 
-$(TOOLS_DIR)/misspell: go.mod go.sum tools.go
+$(TOOLS_DIR)/misspell: $(TOOLS_MOD_DIR)/go.mod $(TOOLS_MOD_DIR)/go.sum $(TOOLS_MOD_DIR)/tools.go
+	cd $(TOOLS_MOD_DIR) && \
 	go build -o $(TOOLS_DIR)/misspell github.com/client9/misspell/cmd/misspell
 
-$(TOOLS_DIR)/stringer: go.mod go.sum tools.go
+$(TOOLS_DIR)/stringer: $(TOOLS_MOD_DIR)/go.mod $(TOOLS_MOD_DIR)/go.sum $(TOOLS_MOD_DIR)/tools.go
+	cd $(TOOLS_MOD_DIR) && \
 	go build -o $(TOOLS_DIR)/stringer golang.org/x/tools/cmd/stringer
 
 precommit: generate build lint examples test
@@ -88,15 +92,15 @@ lint: $(TOOLS_DIR)/golangci-lint $(TOOLS_DIR)/misspell
 	set -e; for dir in $(ALL_GO_MOD_DIRS); do \
 	  echo "golangci-lint in $${dir}"; \
 	  (cd "$${dir}" && \
-	    $(abspath $(TOOLS_DIR))/golangci-lint run --fix && \
-	    $(abspath $(TOOLS_DIR))/golangci-lint run); \
+	    $(TOOLS_DIR)/golangci-lint run --fix && \
+	    $(TOOLS_DIR)/golangci-lint run); \
 	done
 	$(TOOLS_DIR)/misspell -w $(ALL_DOCS)
-	set -e; for dir in $(ALL_GO_MOD_DIRS); do \
+	set -e; for dir in $(ALL_GO_MOD_DIRS) $(TOOLS_MOD_DIR); do \
 	  echo "go mod tidy in $${dir}"; \
 	  (cd "$${dir}" && \
 	    go mod tidy); \
 	done
 
 generate: $(TOOLS_DIR)/stringer
-	PATH="$(abspath $(TOOLS_DIR)):$${PATH}" go generate ./...
+	PATH="$(TOOLS_DIR):$${PATH}" go generate ./...

go.mod

@@ -5,28 +5,14 @@ go 1.13
 require (
 	github.com/DataDog/sketches-go v0.0.0-20190923095040-43f19ad77ff7
 	github.com/benbjohnson/clock v1.0.0
-	github.com/client9/misspell v0.3.4
-	github.com/gogo/protobuf v1.3.1 // indirect
-	github.com/golangci/gocyclo v0.0.0-20180528144436-0a533e8fa43d // indirect
-	github.com/golangci/golangci-lint v1.21.0
-	github.com/golangci/revgrep v0.0.0-20180812185044-276a5c0a1039 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/google/go-cmp v0.3.1
 	github.com/google/gofuzz v1.0.0 // indirect
-	github.com/gostaticanalysis/analysisutil v0.0.3 // indirect
-	github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect
-	github.com/magiconair/properties v1.8.1 // indirect
-	github.com/mattn/go-isatty v0.0.10 // indirect
+	github.com/kr/pretty v0.1.0 // indirect
 	github.com/opentracing/opentracing-go v1.1.1-0.20190913142402-a7454ce5950e
-	github.com/pelletier/go-toml v1.5.0 // indirect
-	github.com/securego/gosec v0.0.0-20191008095658-28c1128b7336 // indirect
-	github.com/spf13/afero v1.2.2 // indirect
-	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/stretchr/testify v1.4.0
-	github.com/uudashr/gocognit v1.0.0 // indirect
-	golang.org/x/sys v0.0.0-20191010194322-b09406accb47 // indirect
-	golang.org/x/tools v0.0.0-20191025174333-e96d959c4788
 	google.golang.org/genproto v0.0.0-20191009194640-548a555dbc03 // indirect
 	google.golang.org/grpc v1.24.0
-	mvdan.cc/unparam v0.0.0-20190917161559-b83a221c10a2 // indirect
-	sourcegraph.com/sqs/pbtypes v1.0.0 // indirect
+	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
+	gopkg.in/yaml.v2 v2.2.7 // indirect
 )

tools/go.mod

@@ -0,0 +1,9 @@
+module go.opentelemetry.io/otel/tools
+
+go 1.13
+
+require (
+	github.com/client9/misspell v0.3.4
+	github.com/golangci/golangci-lint v1.21.0
+	golang.org/x/tools v0.0.0-20191025174333-e96d959c4788
+)