"Conflicting distribution" warning when RUN-ning "apt-get update"

[lestephane]

I have the following Dockerfile:

RUN apt-get update && apt-get install mono-xsp4

When docker build-ing I get the following output

Step 1/10 : FROM mono:latest
 ---> 40f00b0faf24
...
Get:1 http://security.debian.org jessie/updates InRelease [63.1 kB]
Get:2 http://download.mono-project.com stable-jessie/snapshots/5.10.0.160 InRelease [5872 B]
Get:3 http://security.debian.org jessie/updates/main amd64 Packages [641 kB]
Ign http://deb.debian.org jessie InRelease
Get:4 http://deb.debian.org jessie-updates InRelease [145 kB]
Get:5 http://deb.debian.org jessie Release.gpg [2434 B]
Get:6 http://deb.debian.org jessie Release [148 kB]
Get:7 http://download.mono-project.com stable-jessie/snapshots/5.10.0.160/main amd64 Packages [48.3 kB]
Get:8 http://deb.debian.org jessie-updates/main amd64 Packages [23.1 kB]
Get:9 http://deb.debian.org jessie/main amd64 Packages [9064 kB]
Fetched 10.1 MB in 38s (265 kB/s)
Reading package lists...
W: Conflicting distribution: http://download.mono-project.com stable-jessie/snapshots/5.10.0.160 InRelease (expected stable-jessie/snapshots but got jessie)
Reading package lists...
Building dependency tree...
Reading state information...
The following extra packages will be installed:
  mono-xsp4-base
The following NEW packages will be installed:
  mono-xsp4 mono-xsp4-base
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 173 kB of archives.
After this operation, 441 kB of additional disk space will be used.

Can somebody explain what this warning means, and whether i can / should get rid of it?

W: Conflicting distribution: http://download.mono-project.com stable-jessie/snapshots/5.10.0.160 InRelease (expected stable-jessie/snapshots but got jessie)

[akoeplinger]

The warning is harmless and can be safely ignored. It's a side-effect of how snapshotting the release works in the management software we're using for the Linux package repository.

Essentially when we make a snapshot for e.g. 5.10.0.160 it copies the current release to a new folder and thus the old name persists.

@directhex should we add a few words to http://www.mono-project.com/docs/getting-started/install/linux/#accessing-older-releases that explains this warning?

[directhex]

I'm not opposed to adding a note in the docs

[akoeplinger]

@directhex ok, could you please open a PR on the website?

[aaronfranke]

Is there any reason you can't just change bionic to bionic/snapshots/whatever? It would be best to avoid warnings in apt if it's not too hard to do so.

[directhex]

The conflict isn't that there are multiple repositories configured, it's that the file InRelease says "i am in a directory called bionic" when it's actually in a directory called bionic/snapshots/whatever.

It says that because it's literally a point-in-time snapshot of the contents of bionic at a given point, complete with the InRelease file as it was at that point.

The repository management software we use, reprepro, behaves like this.

I thiiiiiink this is the right bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=742281

[benkauffman]

Well ... for those of us who don't want to just ignore this problem, we get a failing build when creating a docker image.

This is what my Dockerfile looks like:

Work around looks like this:

I think that there is a better solution than just "ignore the warning".

[directhex]

That's not this issue, it's a change on the Debian side. https://lists.debian.org/debian-devel-announce/2019/03/msg00006.html

[directhex]

debuerreotype/docker-debian-artifacts#66 is the issue you want to follow

[MagicRatz]

I have the following Dockerfile:

RUN apt-get update && apt-get install mono-xsp4

When docker build-ing I get the following output

Step 1/10 : FROM mono:latest
 ---> 40f00b0faf24
...
Get:1 http://security.debian.org jessie/updates InRelease [63.1 kB]
Get:2 http://download.mono-project.com stable-jessie/snapshots/5.10.0.160 InRelease [5872 B]
Get:3 http://security.debian.org jessie/updates/main amd64 Packages [641 kB]
Ign http://deb.debian.org jessie InRelease
Get:4 http://deb.debian.org jessie-updates InRelease [145 kB]
Get:5 http://deb.debian.org jessie Release.gpg [2434 B]
Get:6 http://deb.debian.org jessie Release [148 kB]
Get:7 http://download.mono-project.com stable-jessie/snapshots/5.10.0.160/main amd64 Packages [48.3 kB]
Get:8 http://deb.debian.org jessie-updates/main amd64 Packages [23.1 kB]
Get:9 http://deb.debian.org jessie/main amd64 Packages [9064 kB]
Fetched 10.1 MB in 38s (265 kB/s)
Reading package lists...
W: Conflicting distribution: http://download.mono-project.com stable-jessie/snapshots/5.10.0.160 InRelease (expected stable-jessie/snapshots but got jessie)
Reading package lists...
Building dependency tree...
Reading state information...
The following extra packages will be installed:
  mono-xsp4-base
The following NEW packages will be installed:
  mono-xsp4 mono-xsp4-base
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 173 kB of archives.
After this operation, 441 kB of additional disk space will be used.

Can somebody explain what this warning means, and whether i can / should get rid of it?

W: Conflicting distribution: http://download.mono-project.com stable-jessie/snapshots/5.10.0.160 InRelease (expected stable-jessie/snapshots but got jessie)