Bug#787437: apt-get fails to execute under fakeroot or proot

Hi!

Commit https://salsa.debian.org/apt-team/apt/-/commit/ebca2f25 affects
the behviour of apt under proot. However I don't know enough about proot
and about code changed in the commit. Therefore I don't know if commit
ebca2f25 is a proper fix for this ticket, and I can't close this ticket.

Ticket fixed by commit ebca2f25:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=806475



Successful reproduction in commit d5e7aa2a preceding the commit in
question (apt built from sources):

acerion@debian:~/ticket/pre_fix$ grep PRETTY_NAME /etc/os-release
PRETTY_NAME="Debian GNU/Linux 9 (stretch)"
acerion@debian:~/ticket/pre_fix$ apt --version
apt 1.1.1 (amd64)
acerion@debian:~/ticket/pre_fix$ proot -0 apt-get download 0ad
E: Method gave invalid 400 URI Failure message: Could not switch group, user _apt is still in group 24
E: Method http has died unexpectedly!
E: Sub-process http returned an error code (112)
acerion@debian:~/ticket/pre_fix$



Unsuccessful reproduction in commit ebca2f25 (apt built from sources):

acerion@debian:~/ticket/post_fix$ grep PRETTY_NAME /etc/os-release
PRETTY_NAME="Debian GNU/Linux 9 (stretch)"
acerion@debian:~/ticket/post_fix$ apt --version
apt 1.1.1 (amd64)
acerion@debian:~/ticket/post_fix$ proot -0 apt-get download 0ad
Get:1 http://archive.debian.org/debian stretch/main amd64 0ad amd64 0.0.21-2 [5,230 kB]
Fetched 5,230 kB in 0s (8,460 kB/s)
acerion@debian:~/ticket/post_fix$



Kamil