$ git clone -n https://src.fedoraproject.org/rpms/rust-cache-padded.git /var/lib/mock/f38-build-side-43-rust-devel-1425132-31553/root/chroot_tmpdir/scmroot/rust-cache-padded
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1425132-31553/root/chroot_tmpdir/scmroot/rust-cache-padded'...
$ git fetch origin c142e39c5a88ed4eaa2ef5dc305516b7e3702d59:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cache-padded
 * [new ref]         c142e39c5a88ed4eaa2ef5dc305516b7e3702d59 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c142e39 Update to version 1.3.0; Fixes RHBZ#2203349