$ git clone -n https://src.fedoraproject.org/rpms/ga.git /var/lib/mock/f42-build-3531885-46325/root/chroot_tmpdir/scmroot/ga
Cloning into '/var/lib/mock/f42-build-3531885-46325/root/chroot_tmpdir/scmroot/ga'...
$ git fetch origin 2cd00780f952bc13da2f42ccc8e04d821c280d16:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ga
 * [new ref]         2cd00780f952bc13da2f42ccc8e04d821c280d16 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2cd0078 Rebuild for scalapack SONAME change.