$ git clone -n https://src.fedoraproject.org/rpms/rust-fake.git /var/lib/mock/f45-build-41538-784/root/chroot_tmpdir/scmroot/rust-fake
Cloning into '/var/lib/mock/f45-build-41538-784/root/chroot_tmpdir/scmroot/rust-fake'...
$ git fetch origin e9ce0c1d8d8ec67a6c73c7cec5a8a617e7d977af:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-fake
 * [new ref]         e9ce0c1d8d8ec67a6c73c7cec5a8a617e7d977af -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e9ce0c1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild