debian/rules: Use pkg-info.mk to determine version in generate_manpages.

debian/changelog

@@ -20,7 +20,9 @@ python-argcomplete (3.1.4-1) UNRELEASED; urgency=medium
     required.
   * Add autopkgtest.
   * Clean correctly. (Closes: #1046886)
-  * debian/rules: set -e in generate_manpages.
+  * debian/rules generate_manpages:
+    - set -e
+    - Use pkg-info.mk to determine version.
 
  -- Stefano Rivera <stefanor@debian.org>  Sat, 04 Nov 2023 10:33:51 +0200
 

debian/rules

@@ -17,9 +17,9 @@ unexport LC_ALL
 %:
 	dh $@ --with python3 --buildsystem=pybuild
 
+include /usr/share/dpkg/pkg-info.mk
 generate_manpages:
 	set -e ; \
-	VERSION=$$(python3 setup.py -V) ; \
 	for file in \
 		activate-global-python-argcomplete \
 		python-argcomplete-check-easy-install-script \
@@ -27,7 +27,7 @@ generate_manpages:
 	do \
 		cp -f scripts/$$file debian/pregenerated_manpages/$$file ; \
 		chmod a+x debian/pregenerated_manpages/$$file ; \
-		PYTHONPATH=. help2man --version-string="$$VERSION" \
+		PYTHONPATH=. help2man --version-string="$(DEB_VERSION)" \
 			--no-info --include=debian/help2man.include \
 			--name "$$file - argcomplete utility script" \
 			-o debian/pregenerated_manpages/$$file.1 --no-discard-stderr \