$ git clone -n https://src.fedoraproject.org/rpms/rust-heapless.git /var/lib/mock/f38-build-side-43-rust-devel-1411401-31435/root/chroot_tmpdir/scmroot/rust-heapless
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1411401-31435/root/chroot_tmpdir/scmroot/rust-heapless'...
$ git fetch origin 19e56ce2e822cd5194fe33bfc9609c679d13f656:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-heapless
 * [new ref]         19e56ce2e822cd5194fe33bfc9609c679d13f656 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 19e56ce Initial Fedora package