make go-ipfs-source.tar.gz fails on master

[chris05atm]

Version information:

go-ipfs commit on master 3f6925d

On MacOS

Type: "bug"

Description:

mk/tarball.mk contains logic that breaks on MacOS. Mac's readlink -f is not compatible with what you'd see on a Linux system unfortunately.

cd $GOPATH/src/
mkdir -p ipfs/go-ipfs && cd $_
git clone https://github.com/ipfs/go-ipfs.git
git checkout 3f6925d # (tip of master just now)
make go-ipfs-source.tar.gz

Instead of doing the right thing the command fails due to -f behaving differently than expected across platforms.