$ git clone -n https://src.fedoraproject.org/rpms/rust-der_derive0.7.git /var/lib/mock/f45-build-41207-780/root/chroot_tmpdir/scmroot/rust-der_derive0.7
Cloning into '/var/lib/mock/f45-build-41207-780/root/chroot_tmpdir/scmroot/rust-der_derive0.7'...
$ git fetch origin 9a52a866c0dba3bf4822326911b5daf08b26f2d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-der_derive0.7
 * [new ref]         9a52a866c0dba3bf4822326911b5daf08b26f2d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a52a86 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild