Bug#358931: Invalid entries in sources.list not recognized

Hi!

> So while approx may not recognize full URIs, the problem at hand was in
> apt not reporting sources.list line as incorrect. Bug reassigned.

It seems that this ticket is related to how malformed URLs from sources.list
are parsed. I have testes the behaviour of apt 3.0.2 from trixie/sid.




A. Info about a test machine

root@debian:~# grep CODENAME /etc/os-release
VERSION_CODENAME=trixie

root@debian:~# apt --version
apt 3.0.2 (amd64)

root@debian:~# cat /etc/apt/sources.list | grep -v "#"
deb [trusted=yes] http://proxy:9999.creditreform.bg/12 ./




B. Test with "proxy" host not available

root@debian:~# apt-get -o "Debug::Acquire::http=true" update
Ign:1 http://proxy:9999/12 ./ InRelease
Ign:1 http://proxy:9999/12 ./ InRelease
Ign:1 http://proxy:9999/12 ./ InRelease
Err:1 http://proxy:9999/12 ./ InRelease
   Could not resolve 'proxy'
Reading package lists... Done
W: Failed to fetch http://proxy:9999/12/./InRelease  Could not resolve 'proxy'
W: Some index files failed to download. They have been ignored, or old ones used instead.




C. Test with "proxy" host available in local network. The host is running
a http server that listens on port 9999.

root@debian:~# grep proxy /etc/hosts
10.0.0.237 proxy

root@debian:~# ip --brief addr
lo               UNKNOWN        127.0.0.1/8 ::1/128
ens3             UP             10.0.0.57/8 fe80::201:2ff:fe01:202/64

root@debian:~# apt-get -o "Debug::Acquire::http=true" update
0% [Working]GET /12/./InRelease HTTP/1.1
Host: proxy:9999
Cache-Control: max-age=0
Accept: text/*
User-Agent: Debian APT-HTTP/1.3 (3.0.2)


Answer for: http://proxy:9999/12/./InRelease
HTTP/1.1 404 Not Found
Server: nginx/1.22.1
Date: Sat, 07 Jun 2025 13:22:33 GMT
Content-Type: text/html
Content-Length: 153
Connection: keep-alive

Ign:1 http://proxy:9999/12 ./ InRelease
0% [Working]GET /12/./Release HTTP/1.1
Host: proxy:9999
Cache-Control: max-age=0
Accept: text/*
If-Modified-Since: Tue, 08 Apr 2025 18:11:40 GMT
User-Agent: Debian APT-HTTP/1.3 (3.0.2)


Answer for: http://proxy:9999/12/./Release
HTTP/1.1 304 Not Modified
Server: nginx/1.22.1
Date: Sat, 07 Jun 2025 13:22:33 GMT
Last-Modified: Tue, 08 Apr 2025 18:11:40 GMT
Connection: keep-alive
ETag: "67f566dc-e4"

Hit:2 http://proxy:9999/12 ./ Release
0% [Working]GET /12/./Release.gpg HTTP/1.1
Host: proxy:9999
User-Agent: Debian APT-HTTP/1.3 (3.0.2)


Answer for: http://proxy:9999/12/./Release.gpg
HTTP/1.1 404 Not Found
Server: nginx/1.22.1
Date: Sat, 07 Jun 2025 13:22:33 GMT
Content-Type: text/html
Content-Length: 153
Connection: keep-alive

Ign:3 http://proxy:9999/12 ./ Release.gpg
Reading package lists... Done




My understanding is that apt's parser doesn't recognize the dot after
"9999" as a character that is unexpected at this position (after a port
number), and instead it discards everything after the port number,
until a first '/' character.

Kamil