$ git clone -n https://src.fedoraproject.org/rpms/rust-smartstring.git /var/lib/mock/f45-build-45051-820/root/chroot_tmpdir/scmroot/rust-smartstring
Cloning into '/var/lib/mock/f45-build-45051-820/root/chroot_tmpdir/scmroot/rust-smartstring'...
$ git fetch origin 0d048b8238d1189d56821664d7e85ea4a5e02982:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-smartstring
 * [new ref]         0d048b8238d1189d56821664d7e85ea4a5e02982 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0d048b8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild