debian/changelog

+macsyfinder (1.0.5-4) UNRELEASED; urgency=medium
+
+  * Attempt to use 2to3 to port to Python3 failed
+    not yet closed: #936977
+    See also https://github.com/gem-pasteur/macsyfinder/issues/21
+
+ -- Andreas Tille <tille@debian.org>  Fri, 06 Sep 2019 10:40:05 +0200
+
 macsyfinder (1.0.5-3) unstable; urgency=medium
 
   * Team upload.

debian/control

@@ -5,7 +5,7 @@ Section: science
 Priority: optional
 Build-Depends: debhelper-compat (= 12),
                dh-python,
-               python,
+               python3,
                python3-sphinx,
                texlive-latex-recommended,
                texlive-plain-generic,
@@ -21,7 +21,7 @@ Homepage: https://github.com/gem-pasteur/macsyfinder
 
 Package: macsyfinder
 Architecture: all
-Depends: ${python:Depends},
+Depends: ${python3:Depends},
          ${misc:Depends},
          hmmer,
          ncbi-blast+,

debian/patches/series

 skip_tests.patch
+# 2to3.patch # deactivate - its more complex than this

debian/rules

@@ -4,21 +4,21 @@
 #export DH_VERBOSE=1
 
 %:
-	dh $@ --with python2 --buildsystem=pybuild
+	dh $@ --with python3 --buildsystem=pybuild
 
 override_dh_auto_install:
 	cd doc && make html
 	cd doc && make latexpdf
-	ln -sf $(shell pybuild --print build_dir --interpreter python) build/lib.$(shell dpkg-architecture -qDEB_BUILD_ARCH_OS)-$(shell dpkg-architecture -qDEB_BUILD_GNU_CPU)-$(shell pyversions -vs)
-	python setup.py install --prefix=debian/macsyfinder/usr/ --install-conf=debian/macsyfinder/etc/ --no-viewer
+	ln -sf $(shell pybuild --print build_dir --interpreter python3) build/lib.$(shell dpkg-architecture -qDEB_BUILD_ARCH_OS)-$(shell dpkg-architecture -qDEB_BUILD_GNU_CPU)-$(shell py3versions -vs)
+	python3 setup.py install --prefix=debian/macsyfinder/usr/ --install-conf=debian/macsyfinder/etc/ --no-viewer
 	# The better solution would be to use
 	#	dh_auto_install -- --prefix=/usr --install-conf=/etc --no-viewer
 	# and fiy setup.py to use --root as install location (which is ignored unfortunately)
 	# Since I have no idea how to fix setup.py here the broken config files are hacked afterwards
 	for conffile in \
 		etc/macsyfinder/macsyfinder.conf.new \
-		usr/lib/python2.7/site-packages/macsypy/config.py \
-		usr/lib/python2.7/site-packages/macsypy/registries.py \
+		usr/lib/python3*/site-packages/macsypy/config.py \
+		usr/lib/python3*/site-packages/macsypy/registries.py \
 		; do \
 	    sed -i 's:debian/macsyfinder::g' debian/macsyfinder/$${conffile} ; \
 	done