$ git clone -n https://src.fedoraproject.org/rpms/rust-rublk.git /var/lib/mock/f45-build-44513-814/root/chroot_tmpdir/scmroot/rust-rublk
Cloning into '/var/lib/mock/f45-build-44513-814/root/chroot_tmpdir/scmroot/rust-rublk'...
$ git fetch origin 8b6586c3961514604d423c68511df2b70138ba6f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rublk
 * [new ref]         8b6586c3961514604d423c68511df2b70138ba6f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b6586c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild