$ git clone -n https://src.fedoraproject.org/rpms/rust-derive-where.git /var/lib/mock/f45-build-41209-780/root/chroot_tmpdir/scmroot/rust-derive-where
Cloning into '/var/lib/mock/f45-build-41209-780/root/chroot_tmpdir/scmroot/rust-derive-where'...
$ git fetch origin 695fa4c2ce52fc2a358f6b4f67e95e8ae510b71c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-derive-where
 * [new ref]         695fa4c2ce52fc2a358f6b4f67e95e8ae510b71c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 695fa4c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild