$ git clone -n https://src.fedoraproject.org/rpms/rust-field-offset.git /var/lib/mock/f45-build-41607-784/root/chroot_tmpdir/scmroot/rust-field-offset
Cloning into '/var/lib/mock/f45-build-41607-784/root/chroot_tmpdir/scmroot/rust-field-offset'...
$ git fetch origin 63b9027a8bc1c1db96e90a8c4074a0f63041a806:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-field-offset
 * [new ref]         63b9027a8bc1c1db96e90a8c4074a0f63041a806 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 63b9027 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild