Makefile `go version` and `read` commands

In this article, php editor Baicao will introduce you to two commonly used commands in Makefile: `go version` and `read`. When writing Makefile, these two commands can help us obtain and display the version information of the Go language, as well as obtain data from user input. By understanding and flexibly using these two commands, we can manage and build our Go projects more efficiently. Let’s learn more about it together!

Question content

I want to extract and verify the go version in the Makefile.

This works in the shell:

% go version | read _ _ version _ && echo "A $version Z"
A go1.21.1 Z

But it doesn’t work in Makefile

check-golang-version:
    go version | read _ _ version _ && echo "A $$version Z"

result:

% make check-golang-version
go version | read _ _ version _ && echo "A $version Z"
A  Z

Ultimately I want a check like this:

check-golang-version:
    go version | read _ _ version _ && test "$$version" = "go1.21.1" || $(error "wrong go version: $$version")

Solution

By default, make uses /bin/sh as the shell (see 5.3.2 Selecting a Shell).

And most likely when you execute the command in a shell, the shell is zsh. zsh Pipe behavior is different from most other shells. See https://riptutorial.com/zsh/example/19869/pipes-and -subshells for an example.

I recommend using go env GOVERSION to get the version of go and assign it to a Makefile variable:

version = $(shell go env GOVERSION)

check-golang-version:
ifneq ($(version), go1.21.1)
    $(error wrong go version: $(version))
endif

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