$ git clone -n https://src.fedoraproject.org/rpms/ImageMagick.git /var/lib/mock/eln-build-side-114847-60997272-6587467/root/chroot_tmpdir/scmroot/ImageMagick
Cloning into '/var/lib/mock/eln-build-side-114847-60997272-6587467/root/chroot_tmpdir/scmroot/ImageMagick'...
$ git fetch origin 5fc1a6b930aa7692d1845dc0f3e8d32857c51e5f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ImageMagick
 * [new ref]         5fc1a6b930aa7692d1845dc0f3e8d32857c51e5f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5fc1a6b Perl 5.42 rebuild