Mage in CI

Posted: September 6, 2018
By: Nate Finch

So, there’s a bootstrap problem with Mage. What if you want to use Mage for your build, but you need to get it during your CI build? Mage is best built… with Mage. The problem is that if you don’t use the custom mage install then Mage isn’t compiled with ldflags that set all the usseful info in mage -version. So what do you do?

Luckily, Mage has a zero install option. You don’t need Mage to build Mage, there’s a bootstrap file that will let you use go run to install Mage with all the great version info. The bootstrap.go file in the root of the repo hooks into mage’s libraries and acts like Mage itself, so you can pass it mage targets in the current directory.

This will download the mage source and install it (if you’re using a gopath):

go get -d
go run $GOPATH/src/ install

If you’re using go modules, you can do it with good old git clone:

git clone
cd mage
go run bootstrap.go install

Note that in the second case, the binary will be copied to where go env GOPATH points (for now, PRs welcome).