build: support 'make deb'

Problem: The 'make deb' target was dropped in the conversion to cmake,
but having an easy way to build test .deb packages has become an
essential component of testing.

Add a custom 'deb' target to CmakeLists.txt. Since this target requires
'make dist', add a 'dist' custom target as well.

Some versions of git do not support the `--add-virtual-file` option,
so instead of using that to add the flux-sched.ver file to the archive,
just create the file, add it, and subsequently remove it.

Fixes #1072

CMakeLists.txt

@@ -198,15 +198,25 @@ add_custom_target(check
   )
 add_custom_target(installcheck
   COMMAND env FLUX_SCHED_TEST_INSTALLED=1 ${CMAKE_CTEST_COMMAND} ${CTEST_COMMON_FLAGS})
+add_custom_target(dist
+  WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+  COMMAND echo ${FLUX_SCHED_VER} > flux-sched.ver
+  COMMAND git archive --format=tar.gz
+  --add-file=flux-sched.ver
+  --prefix=flux-sched-${FLUX_SCHED_VER}/
+  --output=${CMAKE_BINARY_DIR}/flux-sched-${FLUX_SCHED_VER}.tar.gz
+  HEAD .
+  COMMAND rm flux-sched.ver
+  COMMENT "Generated flux-sched-${FLUX_SCHED_VER}.tar.gz"
+  )
 # run installcheck, if it passes then write out version information and pack up
 # a tarball with the result
 add_custom_target(distcheck
   WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
   COMMAND ${CMAKE_COMMAND} --build ${CMAKE_BINARY_DIR} --target all
   COMMAND ${CMAKE_COMMAND} --build ${CMAKE_BINARY_DIR} --target check
-  COMMAND git archive --format=tar.gz
-  --add-virtual-file=flux-sched.ver:${FLUX_SCHED_VER}
-  --prefix=flux-sched-${FLUX_SCHED_VER}/
-  --output=${CMAKE_BINARY_DIR}/flux-sched-${FLUX_SCHED_VER}.tar.gz
-  HEAD .
+  COMMAND ${CMAKE_COMMAND} --build ${CMAKE_BINARY_DIR} --target dist
+  )
+add_custom_target(deb
+  COMMAND ${CMAKE_SOURCE_DIR}/scripts/debbuild.sh ${CMAKE_SOURCE_DIR}
   )