$ git clone -n https://src.fedoraproject.org/rpms/rust-im-rc.git /var/lib/mock/f45-build-42515-794/root/chroot_tmpdir/scmroot/rust-im-rc
Cloning into '/var/lib/mock/f45-build-42515-794/root/chroot_tmpdir/scmroot/rust-im-rc'...
$ git fetch origin 6a1569eaacf2603b0640264fa7cada0ea4fcb954:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-im-rc
 * [new ref]         6a1569eaacf2603b0640264fa7cada0ea4fcb954 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6a1569e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild