$ git clone -n https://src.fedoraproject.org/rpms/ImageMagick.git /var/lib/mock/f42-build-side-1-3501699-45976/root/chroot_tmpdir/scmroot/ImageMagick
Cloning into '/var/lib/mock/f42-build-side-1-3501699-45976/root/chroot_tmpdir/scmroot/ImageMagick'...
$ git fetch origin 4a8111867fddfaf31716a635fd93d5d3a41feef3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ImageMagick
 * [new ref]         4a8111867fddfaf31716a635fd93d5d3a41feef3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4a81118 Update to 7.1.1.47 upstream release