From 5015550f23ae529901c3311e672f2c07b72a64a4 Mon Sep 17 00:00:00 2001
From: Max Vovshin <36747317+Hyaxia@users.noreply.github.com>
Date: Tue, 16 Jul 2019 16:08:31 +0300
Subject: [PATCH] GH-11530 - Go major and minor version validation. (#11531)

* Added - golang version validation.

* Updated error message to include the minor version that is supported.

* Fixed issue with variable.

* Renamed variable.

* Added - golang version validation.

Added validation for major and minor versions of go.

* Fixed the way the validation is performed.

* Changed function declaration (define validate_go_version) to a target (validate_go_version).

* remove unneeded call to validate_go_version
---
 Makefile | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 9ca7947f1b..58e65aa776 100644
--- a/Makefile
+++ b/Makefile
@@ -54,6 +54,11 @@ LDFLAGS += -X "github.com/mattermost/mattermost-server/model.BuildDate=$(BUILD_D
 LDFLAGS += -X "github.com/mattermost/mattermost-server/model.BuildHash=$(BUILD_HASH)"
 LDFLAGS += -X "github.com/mattermost/mattermost-server/model.BuildHashEnterprise=$(BUILD_HASH_ENTERPRISE)"
 LDFLAGS += -X "github.com/mattermost/mattermost-server/model.BuildEnterpriseReady=$(BUILD_ENTERPRISE_READY)"
+GO_MAJOR_VERSION = $(shell $(GO) version | cut -c 14- | cut -d' ' -f1 | cut -d'.' -f1)
+GO_MINOR_VERSION = $(shell $(GO) version | cut -c 14- | cut -d' ' -f1 | cut -d'.' -f2)
+MINIMUM_SUPPORTED_GO_MAJOR_VERSION = 1
+MINIMUM_SUPPORTED_GO_MINOR_VERSION = 12
+GO_VERSION_VALIDATION_ERR_MSG = Golang version is not supported, please update to at least $(MINIMUM_SUPPORTED_GO_MAJOR_VERSION).$(MINIMUM_SUPPORTED_GO_MINOR_VERSION)
 
 # GOOS/GOARCH of the build host, used to determine whether we're cross-compiling or not
 BUILDER_GOOS_GOARCH="$(shell $(GO) env GOOS)_$(shell $(GO) env GOARCH)"
@@ -449,7 +454,18 @@ test-data: start-docker ## Add test data to the local instance.
 	@echo Login with a regular account username=user-1 password=user-1
 	@echo ========================================================================
 
-run-server: start-docker ## Starts the server.
+validate-go-version: ## Validates the installed version of go against Mattermost's minimum requirement.
+	@if [ $(GO_MAJOR_VERSION) -gt $(MINIMUM_SUPPORTED_GO_MAJOR_VERSION) ]; then \
+		exit 0 ;\
+	elif [ $(GO_MAJOR_VERSION) -lt $(MINIMUM_SUPPORTED_GO_MAJOR_VERSION) ]; then \
+		echo '$(GO_VERSION_VALIDATION_ERR_MSG)';\
+		exit 1; \
+	elif [ $(GO_MINOR_VERSION) -lt $(MINIMUM_SUPPORTED_GO_MINOR_VERSION) ] ; then \
+		echo '$(GO_VERSION_VALIDATION_ERR_MSG)';\
+		exit 1; \
+	fi
+
+run-server: validate-go-version start-docker ## Starts the server.
 	@echo Running mattermost for development
 
 	mkdir -p $(BUILD_WEBAPP_DIR)/dist/files