$ git clone -n https://src.fedoraproject.org/rpms/rust-argh.git /var/lib/mock/f38-build-side-43-rust-devel-1397707-31053/root/chroot_tmpdir/scmroot/rust-argh
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1397707-31053/root/chroot_tmpdir/scmroot/rust-argh'...
$ git fetch origin 59fff6ca524daa1b48765407aa23a4ef8647c952:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-argh
 * [new ref]         59fff6ca524daa1b48765407aa23a4ef8647c952 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 59fff6c Update to version 0.1.12; Fixes RHBZ#2229848