$ git clone -n https://src.fedoraproject.org/rpms/glycin-loaders.git /var/lib/mock/f41-build-side-1-2951935-35499/root/chroot_tmpdir/scmroot/glycin-loaders
Cloning into '/var/lib/mock/f41-build-side-1-2951935-35499/root/chroot_tmpdir/scmroot/glycin-loaders'...
$ git fetch origin 6e1ad9b81f1df8b3bc1909d989a5873a69171ddf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glycin-loaders
 * [new ref]         6e1ad9b81f1df8b3bc1909d989a5873a69171ddf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e1ad9b replaced by glycin