$ git clone -n https://src.fedoraproject.org/rpms/rust-serial_test1.git /var/lib/mock/f41-build-side-1-3134918-39764/root/chroot_tmpdir/scmroot/rust-serial_test1
Cloning into '/var/lib/mock/f41-build-side-1-3134918-39764/root/chroot_tmpdir/scmroot/rust-serial_test1'...
$ git fetch origin 926872cde8ba31ce82551c67e2b9667960b19dbb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serial_test1
 * [new ref]         926872cde8ba31ce82551c67e2b9667960b19dbb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 926872c compat package no longer needed