$ git clone -n https://src.fedoraproject.org/rpms/tangerine.git /var/lib/mock/f38-build-side-42-init-devel-988354-29088/root/chroot_tmpdir/scmroot/tangerine
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-988354-29088/root/chroot_tmpdir/scmroot/tangerine'...
$ git fetch origin 27c6a6e7ae6de7f9e41490541dce013396334a20:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tangerine
 * [new ref]         27c6a6e7ae6de7f9e41490541dce013396334a20 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 27c6a6e Simplify build and install phases