debian: Print warning if version mismatch

Signed-off-by: James Valleroy <jvalleroy@mailbox.org>
Reviewed-by: Sunil Mohan Adapa <sunil@medhas.org>

debian/rules

@@ -1,5 +1,7 @@
 #!/usr/bin/make -f
 
+include /usr/share/dpkg/pkg-info.mk
+
 export DH_VERBOSE=1
 export PYBUILD_DESTDIR=debian/tmp
 export PYBUILD_SYSTEM=custom
@@ -9,6 +11,8 @@ export PYBUILD_INSTALL_ARGS=make PYTHON={interpreter} DESTDIR={destdir} install
 export PYBUILD_CLEAN_ARGS=make clean
 export PYBUILD_TEST_ARGS=make PYTHON={interpreter} check-tests
 
+FBX_VERSION := $(shell ./run --develop --version | awk 'NF{ print $$NF }')
+
 %:
 	dh $@ --with python3 --buildsystem=pybuild
 
@@ -19,6 +23,11 @@ override_dh_auto_install-indep:
 	# Ensure the list of dependencies is not empty.
 	test -s debian/freedombox.substvars || exit 1
 
+	# Check that FreedomBox version number is matching.
+ifneq ($(FBX_VERSION),$(DEB_VERSION))
+	>&2 echo "WARNING: FreedomBox version $(FBX_VERSION) does not match package version $(DEB_VERSION)."
+endif
+
 override_dh_installsystemd:
 	# Do not enable or start any service other than FreedomBox service. Use
 	# of --tmpdir is a hack to workaround an issue with dh_installsystemd

doc/plinth.xml

@@ -152,6 +152,14 @@
           </para>
         </listitem>
       </varlistentry>
+      <varlistentry>
+        <term><option>--version</option></term>
+        <listitem>
+          <para>
+            Show the version of FreedomBox and exit.
+          </para>
+        </listitem>
+      </varlistentry>
     </variablelist>
   </refsect1>
 

plinth/__main__.py

@@ -39,6 +39,8 @@ def parse_arguments():
                         help='list package dependencies for essential modules')
     parser.add_argument('--list-apps', default=False, nargs='*',
                         help='list apps')
+    parser.add_argument('--version', action='store_true', default=None,
+                        help='show version and exit')
 
     return parser.parse_args()
 
@@ -125,6 +127,10 @@ def main():
 
     adapt_config(arguments)
 
+    if arguments.version:
+        print(f'FreedomBox {__version__}')
+        sys.exit(0)
+
     if arguments.list_dependencies is not False:
         log.default_level = 'ERROR'
         module_loader.load_modules()