$ git clone -n https://src.fedoraproject.org/rpms/libglib-testing.git /var/lib/mock/f45-build-16268-484/root/chroot_tmpdir/scmroot/libglib-testing
Cloning into '/var/lib/mock/f45-build-16268-484/root/chroot_tmpdir/scmroot/libglib-testing'...
$ git fetch origin 2b219edc5cdaedc2d3054e7f22765c11ab40e1c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libglib-testing
 * [new ref]         2b219edc5cdaedc2d3054e7f22765c11ab40e1c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2b219ed Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild