Bug#878905: debian-policy: Document installability recommendations for dependency alternatives
Package: debian-policy
Severity: normal
APT's solver is greedy and sometimes has a hard time to recover from paths that
don't work out in the end. We see this with opencv failing to build on !linux-any
because:
(1) dconf-service depends default-dbus-session-bus | dbus-session-bus
(2) default-dbus-session-bus is provided by an Architecture: all package, but
depends on systemd
APT refuses to install that.
I think it makes sense to amend section 7.1 with the following information:
Packages on the left hand side of a pipe symbol should either be installable
or should not exist in the given situation (for example, because it is linux-only
and the package only exists on non-Linux platform).
This would help reduce hard to solve situations for greedy algorithms.
I guess that's closely related to #590511, but a bit different.
-- System Information:
Debian Release: buster/sid
APT prefers unstable
APT policy: (900, 'unstable'), (900, 'testing'), (500, 'unstable-debug'), (100, 'experimental'), (1, 'experimental-debug')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 4.13.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_IE.UTF-8, LC_CTYPE=en_IE.UTF-8 (charmap=UTF-8), LANGUAGE=en_IE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages debian-policy depends on:
ii libjs-sphinxdoc 1.6.4-2
debian-policy recommends no packages.
Versions of packages debian-policy suggests:
pn doc-base <none>
--
Debian Developer - deb.li/jak | jak-linux.org - free software dev
| Ubuntu Core Developer |
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