Package rugnux as its own rpm and deb

rugnux was a component of the jfjoch-viewer package, so getting the
offline analysis CLI meant installing the desktop viewer, Qt and the XDS
plugin with it. It links none of the hardware libraries and talks to no
service, so a machine that only processes data should be able to install
it alone.

It is packaged as "rugnux", not "jfjoch-rugnux": the binary, the release
tarball and docs/NAMING.md all call it that, and it is what a user types.
Overriding the component's package name is the only way to drop the
CPACK_PACKAGE_NAME prefix.

/usr/bin/rugnux moves between two packages that both continue to exist,
so the declaration has to be a bound on the OLD viewer rather than an
Obsoletes - obsoleting jfjoch-viewer would uninstall the viewer. rpm gets
Conflicts, deb gets Breaks+Replaces so the two stay co-installable from
here on. rpm rewrites "-" to "_" in a package version (an installed
release reads 1.0.0_rc.160), so the bound is built with the same
substitution; spelled 1.0.0-rc.164 the comparison would silently never
match, which is the failure mode this kind of guard usually has.

Verified by building rpms from a project mirroring these settings: the
package comes out named rugnux at 1.0.0_rc.164 carrying /usr/bin/rugnux
and its notices, the jfjoch package no longer carries rugnux, and
"rpm -i --test" against the rc.160 viewer installed on this workstation
reports the intended dependency conflict rather than a raw file
collision - which is what lets dnf resolve it by upgrading the viewer in
the same transaction. The deb side is checked against CPackDeb.cmake,
which supports NAME, BREAKS and REPLACES per component, but no .deb was
built: this host is RHEL.

CI needs no change; the upload step globs *.rpm and *.deb.

CMakeLists.txt

@@ -484,7 +484,12 @@ if (JFJOCH_RUGNUX_ONLY)
 elseif (JFJOCH_VIEWER_ONLY)
     set(CPACK_COMPONENTS_ALL viewer)
 else()
-    set(CPACK_COMPONENTS_ALL jfjoch writer)
+    # rugnux is packaged separately from everything else, as "rugnux" rather than "jfjoch-rugnux"
+    # (see the DEB/RPM branches below). It is the offline analysis CLI: it links none of the
+    # hardware libraries and talks to no service, so a machine that only processes data can install
+    # it alone. Up to 1.0.0-rc.163 it rode inside the jfjoch-viewer package, which is why both
+    # branches below declare the file move.
+    set(CPACK_COMPONENTS_ALL jfjoch writer rugnux)
     if (JFJOCH_INSTALL_DRIVER_SOURCE)
         list(APPEND CPACK_COMPONENTS_ALL driver-dkms)
     endif()
@@ -605,6 +610,18 @@ elseif (EXISTS "/etc/debian_version")
     set(CPACK_DEBIAN_JFJOCH_PACKAGE_REPLACES "jfjoch-jfjoch")
     set(CPACK_DEBIAN_JFJOCH_PACKAGE_CONFLICTS "jfjoch-jfjoch")
 
+    # rugnux ships as plain "rugnux", not "jfjoch-rugnux": it is a separately named product (see
+    # docs/NAMING.md), the released tarball is called rugnux-<version>-..., and it is what a user
+    # types. Overriding the name is the only way to drop the CPACK_PACKAGE_NAME prefix.
+    set(CPACK_DEBIAN_RUGNUX_PACKAGE_NAME "rugnux")
+
+    # /usr/bin/rugnux moved out of jfjoch-viewer into this package. Breaks+Replaces, NOT Conflicts:
+    # the two packages are meant to be co-installable from 1.0.0-rc.164 on, and this only has to
+    # stop an OLD viewer (which still owns the file) from being unpacked alongside. Without it dpkg
+    # refuses with "trying to overwrite '/usr/bin/rugnux', which is also in package jfjoch-viewer".
+    set(CPACK_DEBIAN_RUGNUX_PACKAGE_BREAKS "jfjoch-viewer (<< ${JFJOCH_VERSION})")
+    set(CPACK_DEBIAN_RUGNUX_PACKAGE_REPLACES "jfjoch-viewer (<< ${JFJOCH_VERSION})")
+
     # Enable automatic shlib dependency discovery
     set(CPACK_DEBIAN_PACKAGE_SHLIBDEPS ON)
 
@@ -646,6 +663,22 @@ elseif (EXISTS "/etc/redhat-release")
     set(CPACK_RPM_EXCLUDE_FROM_AUTO_FILELIST_ADDITION
             /usr/src /usr/share /usr/share/dbus-1 /usr/share/dbus-1/services /usr/share/pixmaps /usr/share/applications)
 
+    # rugnux ships as plain "rugnux", not "jfjoch-rugnux" -- see the DEB branch above for why.
+    set(CPACK_RPM_RUGNUX_PACKAGE_NAME "rugnux")
+    set(CPACK_RPM_RUGNUX_PACKAGE_SUMMARY "Offline crystallographic data analysis for Jungfraujoch")
+    set(CPACK_RPM_RUGNUX_PACKAGE_DESCRIPTION
+            "rugnux processes a stored Jungfraujoch HDF5 dataset: spot finding, indexing, geometry
+refinement, Bragg integration, scaling and merging. It needs none of the acquisition stack -- no
+broker, no detector, no FPGA card -- so it can be installed on a machine that only processes data.")
+
+    # /usr/bin/rugnux moved out of the jfjoch-viewer package into this one. Conflicts against the
+    # OLD viewer only, and deliberately NOT Obsoletes: obsoleting jfjoch-viewer would uninstall the
+    # viewer, which still exists and is still wanted. rpm turns "-" into "_" in a package version
+    # (an installed release reads 1.0.0_rc.160), so the bound has to be spelled the same way or the
+    # comparison silently never matches.
+    string(REPLACE "-" "_" _jfjoch_rpm_version "${JFJOCH_VERSION}")
+    set(CPACK_RPM_RUGNUX_PACKAGE_CONFLICTS "jfjoch-viewer < ${_jfjoch_rpm_version}")
+
     # DKMS component scripts and requirements for RPM
     if (JFJOCH_INSTALL_DRIVER_SOURCE)
         set(CPACK_RPM_DRIVER-DKMS_PACKAGE_REQUIRES "dkms, gcc, bash, sed")