$ git clone -n https://src.fedoraproject.org/rpms/rust-rgb.git /var/lib/mock/f45-build-44424-813/root/chroot_tmpdir/scmroot/rust-rgb
Cloning into '/var/lib/mock/f45-build-44424-813/root/chroot_tmpdir/scmroot/rust-rgb'...
$ git fetch origin 3dfe23efc2fd2eaf94bc7b40f33dc2a981db735c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rgb
 * [new ref]         3dfe23efc2fd2eaf94bc7b40f33dc2a981db735c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3dfe23e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild