$ git clone -n https://src.fedoraproject.org/rpms/rust-pom.git /var/lib/mock/f45-build-43937-809/root/chroot_tmpdir/scmroot/rust-pom
Cloning into '/var/lib/mock/f45-build-43937-809/root/chroot_tmpdir/scmroot/rust-pom'...
$ git fetch origin d6bdfb748f899bf76eb4335fe56b8b73f766ed90:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pom
 * [new ref]         d6bdfb748f899bf76eb4335fe56b8b73f766ed90 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d6bdfb7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild