$ git clone -n https://src.fedoraproject.org/rpms/rust-os_str_bytes6.git /var/lib/mock/f45-build-43604-804/root/chroot_tmpdir/scmroot/rust-os_str_bytes6
Cloning into '/var/lib/mock/f45-build-43604-804/root/chroot_tmpdir/scmroot/rust-os_str_bytes6'...
$ git fetch origin 2be83824d45c3ad8b3561bdbe7c265ce88b534a5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-os_str_bytes6
 * [new ref]         2be83824d45c3ad8b3561bdbe7c265ce88b534a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2be8382 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild