debian/changelog

+piuparts (0.87) UNRELEASED; urgency=medium
+
+  [ Philipp Hahn ]
+  * piuparts.py: use `apt-cache show --no-all-versions` to prevent generating
+    a "piuparts-depends-dummy" package with multiple dependencies on the same
+    package with different versions. (Closes: #898606)
+
+ -- Holger Levsen <holger@debian.org>  Mon, 14 May 2018 12:03:45 +0000
+
 piuparts (0.86) unstable; urgency=medium
 
   * debian/control: switch packaging to salsa.debian.org. Thanks to the alioth

piuparts.py

@@ -1180,7 +1180,7 @@ class Chroot:
         known_packages = []
         new_packages = []
         for name in packages:
-            (status, output) = self.run(["apt-cache", "show", name],
+            (status, output) = self.run(["apt-cache", "show", "--no-all-versions", name],
                                         ignore_errors=True)
             # apt-cache reports status for some virtual packages and packages
             # in status config-files-remaining state without installation
@@ -2292,7 +2292,7 @@ def install_purge_test(chroot, chroot_state, package_files, packages, extra_pack
         else:
             # We have package names.  Use apt to get all their control
             # information.
-            apt_cache_args = ["apt-cache", "show"]
+            apt_cache_args = ["apt-cache", "show", "--no-all-versions"]
             if os.environ["PIUPARTS_DISTRIBUTION"] in ["lenny"]:
                 # apt-cache in lenny does not accept version-qualified packages
                 apt_cache_args.extend(unqualify(packages))