On Sat, Aug 04, 2018 at 11:24:27AM -0500, Rob Browning wrote: > Axel Beckert <a...@debian.org> writes: > > > upgrading emacs25-lucid on armhf pulls in emacs-lucid, but that fails > > to install as follows: > > > > Preparing to unpack .../emacs-lucid_1%3a25.2+1-8_armhf.deb ... > > Unpacking emacs-lucid (1:25.2+1-8) ... > > dpkg: error processing archive > > /var/cache/apt/archives/emacs-lucid_1%3a25.2+1-8_armhf.deb (--unpack): > > trying to overwrite '/usr/share/emacs/25.2/etc/DOC', which is also in > > package emacs25-lucid 25.2+1-6+b3 > > dpkg-deb: error: paste subprocess was killed by signal (Broken pipe) > > Errors were encountered while processing: > > /var/cache/apt/archives/emacs-lucid_1%3a25.2+1-8_armhf.deb > > > > The Replaces header only contains emacs-gtk and emacs-nox, but likely > > also needs emacs25-lucid. And probably also needs a "Breaks: > > emacs25-lucid". > > I suspect I'm just misunderstanding the dependency system, but this > confuses me because: > > emacs25-lucid 25.2+1-6+b3 > Depends: emacs25-bin-common > > and > > emacs25-bin-common > Depends: emacs25-common > > and on the newer side > > emacs-lucid 1:25.2+1-8 > Depends: emacs-common (= 1:25.2+1-8) > > and > > emacs-common 1:25.2+1-8 > Depends: emacsen-common (>= 3.0.0) > > and > > emacsen-common (>= 3.0.0) > Conflicts: emacs25-common > > So I'd expected the indirect dependency of emacs-lucid on the newer > emacsen-common to have indirectly forced emacs25-lucid out (via the > emacsen-common conflicts), so that there wouldn't be a file conflict, > but obviously I'm missing something (and agree that it's a somewhat > tortuous route).
This needs Breaks+Replaces: https://www.debian.org/doc/debian-policy/ch-relationships.html#overwriting-files-in-other-packages The Breaks part might be covered by the Conflicts relationship you showed. But during the upgrade the Replaces is additionally required, for telling dpkg that emacs-lucid contains files that are during the upgrade still present from the not yet fully removed emacs25-lucid package. > Thanks cu Adrian -- "Is there not promise of rain?" Ling Tan asked suddenly out of the darkness. There had been need of rain for many days. "Only a promise," Lao Er said. Pearl S. Buck - Dragon Seed
