$ git clone -n https://src.fedoraproject.org/rpms/rust-tinyvec_macros.git /var/lib/mock/f38-build-side-43-rust-devel-1417742-31459/root/chroot_tmpdir/scmroot/rust-tinyvec_macros
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1417742-31459/root/chroot_tmpdir/scmroot/rust-tinyvec_macros'...
$ git fetch origin c6649463980195a063db43aa298a02265cde6874:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tinyvec_macros
 * [new ref]         c6649463980195a063db43aa298a02265cde6874 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c664946 Update to version 0.1.1; Fixes RHBZ#2166794