$ git clone -n https://src.fedoraproject.org/rpms/rust-heatseeker.git /var/lib/mock/f38-build-side-43-rust-devel-1409872-31406/root/chroot_tmpdir/scmroot/rust-heatseeker
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1409872-31406/root/chroot_tmpdir/scmroot/rust-heatseeker'...
$ git fetch origin 358d3bbf54d8b3dcd4e01c45d9b10c5f0c962908:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-heatseeker
 * [new ref]         358d3bbf54d8b3dcd4e01c45d9b10c5f0c962908 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 358d3bb Rebuild for fixed frame pointer compiler flags in Rust RPM macros