$ git clone -n https://src.fedoraproject.org/rpms/pdfsign.git /var/lib/mock/f39-build-2237868-53552/root/chroot_tmpdir/scmroot/pdfsign
Cloning into '/var/lib/mock/f39-build-2237868-53552/root/chroot_tmpdir/scmroot/pdfsign'...
$ git fetch origin 30ba5d58d752e3c30203a118096053ce0214972e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pdfsign
 * [new ref]         30ba5d58d752e3c30203a118096053ce0214972e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 30ba5d5 Switch to BR podofo0.9-devel