$ git clone -n https://src.fedoraproject.org/rpms/rust-mailparse.git /var/lib/mock/f45-build-43108-800/root/chroot_tmpdir/scmroot/rust-mailparse
Cloning into '/var/lib/mock/f45-build-43108-800/root/chroot_tmpdir/scmroot/rust-mailparse'...
$ git fetch origin 039944765fc10790c4699867bc88c565b709ec3c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-mailparse
 * [new ref]         039944765fc10790c4699867bc88c565b709ec3c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0399447 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild