$ git clone -n https://src.fedoraproject.org/rpms/glycin-loaders.git /var/lib/mock/f41-build-851334-165908/root/chroot_tmpdir/scmroot/glycin-loaders
Cloning into '/var/lib/mock/f41-build-851334-165908/root/chroot_tmpdir/scmroot/glycin-loaders'...
$ git fetch origin cdf5818c15d969f4b568d48be4d9a6754f4236c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glycin-loaders
 * [new ref]         cdf5818c15d969f4b568d48be4d9a6754f4236c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cdf5818 Re-enable OpenEXR support