and I guess I can demystify right away what is going on (although I didn't try to reconfirm by rebuilding or debugging):
https://salsa.debian.org/apt-team/apt/blob/master/apt-private/private-show.cc#L488 if (F.Flagged(pkgCache::Flag::NoPackages)) continue; so no apt entries are displayed if they provide no packages ATM. Although I could see how it is useful generally, for our purpose it is somewhat of a blow, since we are trying to use apt-cache policy output to decide what APT sources in general are configured. and since we are rolling back in time to use snapshots, they might have had packages at that point in time, thus we better adjust them as well. Also documentation has no hint on such a "feature": policy [pkg...] policy is meant to help debug issues relating to the preferences file. With no arguments it will print out the priorities of each source. Otherwise it prints out detailed information about the priority selection of the named package. so "each source", but not each source is printed out! I wish this "feature" of skipping APT sources without packages was somehow optional/configurable. Otherwise, at least documentation should mention such feature. Cheers! On Fri, 16 Nov 2018, Yaroslav Halchenko wrote: > Even though there are 3 APT sources available, apt-cache policy in buster > reports only a single one ignoring security and updates: > $> docker run -it --rm debian:buster > Unable to find image 'debian:buster' locally > buster: Pulling from library/debian > bac5159b230a: Pull complete > Digest: > sha256:8d601936efd739539811324e431a559782740a96b0e2896a8740245e1aad8db2 > ... -- Yaroslav O. Halchenko Center for Open Neuroscience http://centerforopenneuroscience.org Dartmouth College, 419 Moore Hall, Hinman Box 6207, Hanover, NH 03755 Phone: +1 (603) 646-9834 Fax: +1 (603) 646-1419 WWW: http://www.linkedin.com/in/yarik
