$ git clone -n https://src.fedoraproject.org/rpms/rust-sha2_0.10.git /var/lib/mock/f45-build-44909-819/root/chroot_tmpdir/scmroot/rust-sha2_0.10
Cloning into '/var/lib/mock/f45-build-44909-819/root/chroot_tmpdir/scmroot/rust-sha2_0.10'...
$ git fetch origin 12c3fce3cb1b1c2f593b51b32828fce5e8706d89:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-sha2_0.10
 * [new ref]         12c3fce3cb1b1c2f593b51b32828fce5e8706d89 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 12c3fce Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild