$ git clone -n https://src.fedoraproject.org/rpms/rust-unicode-xid.git /var/lib/mock/f45-build-45936-829/root/chroot_tmpdir/scmroot/rust-unicode-xid
Cloning into '/var/lib/mock/f45-build-45936-829/root/chroot_tmpdir/scmroot/rust-unicode-xid'...
$ git fetch origin 2cd5fa43b3489b706e6ff085c3d96be45807652f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-unicode-xid
 * [new ref]         2cd5fa43b3489b706e6ff085c3d96be45807652f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2cd5fa4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild