$ git clone -n https://src.fedoraproject.org/rpms/rust-charset.git /var/lib/mock/f45-build-40748-775/root/chroot_tmpdir/scmroot/rust-charset
Cloning into '/var/lib/mock/f45-build-40748-775/root/chroot_tmpdir/scmroot/rust-charset'...
$ git fetch origin 671b3ed74584134559ab3b19f503868024a1c023:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-charset
 * [new ref]         671b3ed74584134559ab3b19f503868024a1c023 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 671b3ed Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild