$ git clone -n https://src.fedoraproject.org/rpms/ghc-GLUT.git /var/lib/mock/f40-build-2145848-50880/root/chroot_tmpdir/scmroot/ghc-GLUT
Cloning into '/var/lib/mock/f40-build-2145848-50880/root/chroot_tmpdir/scmroot/ghc-GLUT'...
$ git fetch origin 60f396644cb8024b03b5e4e5942bab2079b1c46f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-GLUT
 * [new ref]         60f396644cb8024b03b5e4e5942bab2079b1c46f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 60f3966 Convert to %autorelease and %autochangelog