$ git clone -n https://src.fedoraproject.org/rpms/libdigidocpp.git /var/lib/mock/f42-build-865133-172821/root/chroot_tmpdir/scmroot/libdigidocpp
Cloning into '/var/lib/mock/f42-build-865133-172821/root/chroot_tmpdir/scmroot/libdigidocpp'...
$ git fetch origin 0b7efc80e31297d8967d95bdb326f033777eb39e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libdigidocpp
 * [new ref]         0b7efc80e31297d8967d95bdb326f033777eb39e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0b7efc8 Upstream 4.0.0 release