$ git clone -n https://src.fedoraproject.org/rpms/rust-count-zeroes.git /var/lib/mock/f38-build-side-43-rust-devel-1417118-31459/root/chroot_tmpdir/scmroot/rust-count-zeroes
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1417118-31459/root/chroot_tmpdir/scmroot/rust-count-zeroes'...
$ git fetch origin a824b89e53194a582a40d1150e0495f54bc932bf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-count-zeroes
 * [new ref]         a824b89e53194a582a40d1150e0495f54bc932bf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a824b89 Rebuild for fixed frame pointer compiler flags in Rust RPM macros