Check minimum required go version when build

[gmgigi96]

When build reva, if go version is below the minimum required, it will warn the user with a message.

Closes #1758

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[labkode]

@gmgigi96 please provide a changelog as per CI

[ishank011]

@gmgigi96 I don't see the echo output, just the command invocation even though my version is lower than the recommended one

$ make build                                                                              [12:22:29]
GOPROXY=off
echo BUILD_DATE=`date +%FT%T%z`
BUILD_DATE=2021-06-04T12:22:33+0200
echo GIT_COMMIT=`git rev-parse --short HEAD`
GIT_COMMIT=288eafd9
echo GIT_DIRTY=`git diff-index --quiet HEAD -- || echo "dirty-"`
GIT_DIRTY=dirty-
echo VERSION=`git describe --always`
VERSION=v1.7.0-65-g288eafd9
echo GO_VERSION=1.15.0
GO_VERSION=1.15.0
`go env GOPATH`/bin/goimports -w tools pkg internal cmd
echo -e "1.16.2\n15.0" | sort -Vc &> /dev/null || echo -e "\n\033[33;5m[WARNING]\033[0m You are using a not supported go version. Please use 1.16.2 or above.\n"
go build -ldflags "-X main.gitCommit=`git rev-parse --short HEAD` -X main.version=`git describe --always` -X main.goVersion=1.15.0 -X main.buildDate=`date +%FT%T%z`" -o ./cmd/revad/revad ./cmd/revad
go build -ldflags "-X main.gitCommit=`git rev-parse --short HEAD` -X main.version=`git describe --always` -X main.goVersion=1.15.0 -X main.buildDate=`date +%FT%T%z`" -o ./cmd/reva/reva ./cmd/reva

[gmgigi96]

@ishank011 could you paste me your go version output?

[ishank011]

I set GO_VERSION manually to 1.15.0 to test it

[ishank011]

Ah my bad. It's supposed to be go1.15.0. Works now. Can you add @ before echo to suppress the command invocation?

[gmgigi96]

I set GO_VERSION manually to 1.15.0 to test it

I was asking because in my machine and other different machines the third argument of go version is go<version>, so to work the variable should be set to go1.15.0...
Maybe try to change the MINIMUM_GO_VERSION variable to test it

[gmgigi96]

Ah my bad. It's supposed to be go1.15.0. Works now. Can you add @ before echo to suppress the command invocation?

Of course, thanks

[gmgigi96]

Ah my bad. It's supposed to be go1.15.0. Works now. Can you add @ before echo to suppress the command invocation?

Now should work also if you don't put go before the version