// run the applet
mockbuild@booky:~/pbdeps/yyyww$ ../ctrl-write 

mockbuild@booky:~/pbdeps/yyyww$ cat zzctrl 
Package: libxenmisc4.17t64
Provides: ${t64:Provides}
Replaces: libxenmisc4.17
Breaks: libxenmisc4.17 (<< ${source:Version})
Section: libs
Architecture: amd64 arm64 armhf
Depends: ${shlibs:Depends}, ${misc:Depends}

Package: libxencall1t64
Provides: ${t64:Provides}
Replaces: libxencall1
Breaks: libxencall1 (<< ${source:Version})
Section: libs
Architecture: amd64 arm64 armhf
Depends: ${shlibs:Depends}, ${misc:Depends}

Package: libxendevicemodel1t64
Provides: ${t64:Provides}
Replaces: libxendevicemodel1
Breaks: libxendevicemodel1 (<< ${source:Version})
Section: libs
Architecture: amd64 arm64 armhf
Depends: ${shlibs:Depends}, ${misc:Depends}

Package: libxenevtchn1t64
Provides: ${t64:Provides}
Replaces: libxenevtchn1
Breaks: libxenevtchn1 (<< ${source:Version})
Section: libs
Architecture: amd64 arm64 armhf
Depends: ${shlibs:Depends}, ${misc:Depends}

Package: libxenforeignmemory1t64
Provides: ${t64:Provides}
Replaces: libxenforeignmemory1
Breaks: libxenforeignmemory1 (<< ${source:Version})
Section: libs
Architecture: amd64 arm64 armhf
Depends: ${shlibs:Depends}, ${misc:Depends}

Package: libxengnttab1t64
Provides: ${t64:Provides}
Replaces: libxengnttab1
Breaks: libxengnttab1 (<< ${source:Version})
Section: libs
Architecture: amd64 arm64 armhf
Depends: ${shlibs:Depends}, ${misc:Depends}

Package: libxenstore4t64
Provides: ${t64:Provides}
Replaces: libxenstore4
Breaks: libxenstore4 (<< ${source:Version})
Section: libs
Architecture: amd64 arm64 armhf
Depends: ${shlibs:Depends}, ${misc:Depends}

Package: libxentoolcore1t64
Provides: ${t64:Provides}
Replaces: libxentoolcore1
Breaks: libxentoolcore1 (<< ${source:Version})
Section: libs
Architecture: amd64 arm64 armhf
Depends: ${shlibs:Depends}, ${misc:Depends}

Package: libxentoollog1t64
Provides: ${t64:Provides}
Replaces: libxentoollog1
Breaks: libxentoollog1 (<< ${source:Version})
Section: libs
Architecture: amd64 arm64 armhf
Depends: ${shlibs:Depends}, ${misc:Depends}

Package: libxenhypfs1t64
Provides: ${t64:Provides}
Replaces: libxenhypfs1
Breaks: libxenhypfs1 (<< ${source:Version})
Section: libs
Architecture: amd64 arm64 armhf
Depends: ${shlibs:Depends}, ${misc:Depends}

mockbuild@booky:~/pbdeps/yyyww$ dh_listpackages 
xenstore-utils
xen-utils-common
xen-hypervisor-common
xen-doc
xen-utils-4.17
xen-utils-4.17-dbg
xen-hypervisor-4.17-amd64
xen-hypervisor-4.17-amd64-dbg
xen-system-amd64
libxen-dev
libxenmisc4.17
libxencall1
libxendevicemodel1
libxenevtchn1
libxenforeignmemory1
libxengnttab1
libxenstore4
libxentoolcore1
libxentoollog1
libxenhypfs1

mockbuild@booky:~/pbdeps/yyyww$ cat ../ctrl-write 
#!/bin/bash

argwrite () {
ZZS=$1
cat >> zzctrl<<EOL
Package: ${ZZS}t64
Provides: \${t64:Provides}
Replaces: $1
Breaks: $2 (<< \${source:Version})
Section: libs
Architecture: amd64 arm64 armhf
Depends: \${shlibs:Depends}, \${misc:Depends}

EOL
}

for i in `dh_listpackages | grep '^lib' | sed -e '/\-dev/d' `; do argwrite $i $i ;done
 --- snip ---