Linda: ITP is at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=922155

for convenience

Linda

starts focusing into sources.list(5) integration now

Maximus: Btw, if you used that test package there's a bug where your answers to debconf(1) (either about APT trust or sources.list) won't be forgotten if you apt purge the package.

I've fixed it just now.

I attached them here hours ago :o

Right after your message

Well, don't use them now. xD

I'll give you a new version for testing if you'd like, right now

Right, just a minute

I have a failing build atm

Maximus: There you go. It will print a debug line during the install.

(if you chose to install APT sources)

Setting up matrix-archive-keyring (2015.12.09+debian0.5) ...
DEBUG: deb [signed-by=/usr/share/keyrings/matrix-archive-keyring.gpg] http://matrix.org/packages/debian/ sid main
$ sudo apt install matrix-synapse-py3
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package matrix-synapse-py3
$ sudo sh -c 'apt update && apt install matrix-synapse-py3'
Hit:1 http://ftp.fi.debian.org/debian unstable InRelease
Get:2 http://matrix.org/packages/debian sid InRelease [3075 B]
Get:3 http://matrix.org/packages/debian sid/main Sources [2715 B]
Get:4 http://matrix.org/packages/debian sid/main amd64 Packages [2355 B]
Fetched 8145 B in 0s (18.7 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
10 packages can be upgraded. Run 'apt list --upgradable' to see them.
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  python3-distutils python3-lib2to3
Suggested packages:
  sqlite3
The following NEW packages will be installed:
  matrix-synapse-py3 python3-distutils python3-lib2to3
0 upgraded, 3 newly installed, 0 to remove and 10 not upgraded.
Need to get 29.5 MB of archives.
After this operation, 161 MB of additional disk space will be used.
Do you want to continue? [Y/n] ^C

😊

I was about to list them

Let me see

1. /etc/apt/trusted.gpg will have Matrix.org signing key removed.
2. /etc/apt/trusted.gpg.d/matrix-org_packages.asc will be removed if it exists.
3. /etc/apt/sources.list.d/matrix-org.list will be overwritten and maintained by the package. The existence of this file depends on the answer "yes" or "no" question to APT data sources every time. (If you need to choose again, run dpkg-reconfigure matrix-archive-keyring.)
4. /usr/share/keyrings/matrix-archive-keyring.gpg is added.
5. /etc/apt/trusted.gpg.d/matrix-archive-keyring.gpg will be a new symlink to /usr/share/keyrings/matrix-archive-keyring.gpg. This is also managed by the package in rare cases.

#5 is only true if using dpkg-reconfigure and answering "yes" to APT system trusted key. (You probably don't want that, so choose "no".)

Hopefully that answers to your question.

I think there's also a command dpkg-preconfigure, but I've never used it before.