Bug#43830: apt: apt-get needs "*__Package" instead of "*_Package" with cdrom

[Roland Rosenfeld <roland@spinnaker.de>]

Package: apt
Version: 0.3.11
Severity: normal

As you can see on the subject, this bug confuses me a bit...

Here's what happened:
I created a CD with some of the potato packages I received from the
net.  On this CD there is a directory debian/binary-i386/ with the
*.deb files in it.  I created Packages and Packages.gz (the latter one 
doesn't seem to be used by apt-cdrom) using:
        dpkg-scanpackages . /dev/null > Packages

Then I run 
        apt-cdrom -r add
and entered "debian-potato-1999-08-31" as the disc name.

Everything seems to be all right, /etc/apt/sources.list is extended by 
the following line:
deb "cdrom:debian-potato-1999-08-31/debian/binary-i386/" /

/var/state/apt/cdroms.list is extended by the following lines:
CD::1c1f77b2640898610b55a082d4f80f0e-2 "debian-potato-1999-08-31";
CD::1c1f77b2640898610b55a082d4f80f0e-2::Label "Debian GNU/Linux unstable 1999-08-31 misc binary-i386 ";

(the latter line comes from .disk/info on the CD).

and in /var/state/apt/lists two files are created:
debian-potato-1999-08-31_debian_binary-i386_Packages 
debian-potato-1999-08-31_debian_binary-i386_Release 

Up to this point everything seems okay.  But now I run 
        apt-get update
to update the list of available files.  

But this gives me the following message:

Err cdrom:debian-potato-1999-08-31/debian/binary-i386/ / Packages
  Please use apt-cdrom to make this CD recognized by APT. apt-get update cannot be used to add new CDs

I tried apt-get check and this gives me the message:

W: Couldn't stat source package list 'cdrom:debian-potato-1999-08-31/debian/binary-i386/ / Packages' (/var/state/apt/lists/debian-potato-1999-08-31_debian_binary-i386__Packages) - stat (2 Datei oder Verzeichnis nicht gefunden)
W: You may want to run apt-get update to correct these missing files

Now I see, that apt-cdrom created the file as *_Packages, which
apt-get seems to look for *__Packages.  Don't ask me why (with the
Linux Central CDs everything works correct with *_Packages).

Renaming the file from *_Packages to *__Packages works around this
problem.  But I do not have any idea, what I have done wrong.  Seems
to be a bug in apt-get, which add this duplicated underscore....

Ciao

        Roland

-- System Information
Debian Release: potato
Kernel Version: Linux spinnaker 2.2.12 #2 Don Aug 26 15:00:39 CEST 1999 i586 unknown

Versions of the packages apt depends on:
hi  libc6           2.1.2-0pre7    GNU C Library: Shared libraries and timezone
hi  libstdc++2.9-gl 2.91.66-2      The GNU stdc++ library (EGCS version)