Bug#873074: cdrom: Mirror chosen in expert install will not be written to sources.list

[Daniel <daniel-auth@gmx.net>]

Package: cdrom
Severity: normal
Tags: d-i

Dear Maintainer,

   * What led up to the situation?

installed debian stretch dvd image (from usb flashdrive), used
installer in expert mode, chosen mirror ftp.halifax.rwth-aachen.de,
protocol http

   * What was the outcome of this action?

After installation, there is an entry in file /etc/apt/sources.list
for the cd image but not for the mirror.

   * What outcome did you expect instead?

mirror chosen during installation is written to sources.list


-- System Information:
Debian Release: 9.1
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-3-amd64 (SMP w/2 CPU cores)
Locale: LANG=de_DE.utf8, LC_CTYPE=de_DE.utf8 (charmap=UTF-8), LANGUAGE=de_DE.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)