From b89f7fa1d648abe6753e18eacebbb374b369700b Mon Sep 17 00:00:00 2001
From: Niels de Vos <ndevos@redhat.com>
Date: Mon, 4 May 2020 10:28:40 +0200
Subject: [PATCH] build: add check for functional environment

Updates: #1000
Reported-by: Madhu Rajanna <madhupr007@gmail.com>
Signed-off-by: Niels de Vos <ndevos@redhat.com>
---
 Makefile             | 13 ++++++++-----
 scripts/check-env.sh | 46 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+), 5 deletions(-)
 create mode 100755 scripts/check-env.sh

diff --git a/Makefile b/Makefile
index 5de0d33c6..e52fba9c2 100644
--- a/Makefile
+++ b/Makefile
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-.PHONY: all cephcsi
+.PHONY: all cephcsi check-env
 
 CONTAINER_CMD?=$(shell docker version >/dev/null 2>&1 && echo docker)
 ifeq ($(CONTAINER_CMD),)
@@ -62,12 +62,12 @@ all: cephcsi
 
 .PHONY: go-test static-check mod-check go-lint go-lint-text gosec
 test: go-test static-check mod-check
-static-check: go-lint go-lint-text gosec
+static-check: check-env go-lint go-lint-text gosec
 
-go-test:
+go-test: check-env
 	./scripts/test-go.sh
 
-mod-check:
+mod-check: check-env
 	@echo 'running: go mod verify'
 	@go mod verify && [ "$(shell sha512sum go.mod)" = "`sha512sum go.mod`" ] || ( echo "ERROR: go.mod was modified by 'go mod verify'" && false )
 
@@ -83,8 +83,11 @@ gosec:
 func-test:
 	go test -mod=vendor github.com/ceph/ceph-csi/e2e $(TESTOPTIONS)
 
+check-env:
+	@./scripts/check-env.sh
+
 .PHONY: cephcsi
-cephcsi:
+cephcsi: check-env
 	if [ ! -d ./vendor ]; then (go mod tidy && go mod vendor); fi
 	GOOS=linux go build -mod vendor -a -ldflags '$(LDFLAGS)' -o _output/cephcsi ./cmd/
 
diff --git a/scripts/check-env.sh b/scripts/check-env.sh
new file mode 100755
index 000000000..e530362b8
--- /dev/null
+++ b/scripts/check-env.sh
@@ -0,0 +1,46 @@
+#!/bin/sh
+#
+# Check the environment for dependencies and configuration
+#
+
+# count errors, run script to the end before exiting
+ERRORS=0
+fail() {
+	echo "${*}" > /dev/stderr
+	ERRORS=$((ERRORS+1))
+}
+
+# check if 'go' is available
+[ -n "$(command -v go)" ] \
+	|| fail "could not find 'go' executable"
+
+# parse the Golang version, return the digit passed as argument
+# 1.13.9 -> go_version 1 -> 1
+# 1.13.9 -> go_version 2 -> 13
+# 1.13.9 -> go_version 3 -> 9
+go_version() {
+	go version | cut -d' ' -f3 | sed 's/^go//' | cut -d'.' -f"${1}"
+}
+
+# Golang needs to be > 1.13
+GO_MAJOR=$(go_version 1)
+GO_MINOR=$(go_version 2)
+if ! [ "${GO_MAJOR}" -gt 1 ]
+then
+	if ! { [ "${GO_MAJOR}" -eq 1 ] && [ "${GO_MINOR}" -ge 13 ]; }
+	then
+		fail "go version needs to be >= 1.13"
+	fi
+fi
+
+# we're building with modules, so GO111MODULE needs to be 'on' or 'auto'
+# some versions of Go return nothing when GO111MODULE is not explicitly
+# configured
+[ "$(go env GO111MODULE 2>&1)" = '' ] || [ "$(go env GO111MODULE)" = 'on' ] || [ "$(go env GO111MODULE)" = 'auto' ] \
+	|| fail "GO111MODULE should be set to 'on' or 'auto'"
+
+# CGO needs to be enabled, we build with go-ceph language bindings
+[ "$(go env CGO_ENABLED)" = '1' ] \
+	|| fail "CGO_ENABLED should be set to '1'"
+
+exit ${ERRORS}