Package: apt Version: 0.5.27 When apt-cdrom rewrites sources.list to add a CD reference, it uses a 300-byte buffer to read lines from the old sources.list. For some reason, if a line in sources.list is longer than 300 characters, the ifstream object used for reading gets confused. Subsequent reads result in zero bytes being read. Since we haven't reached EOF (there's still the rest of that line, at least, to read), and since we have lost the ability to read more data from the ifstream, the loop is infinite.
Moreover, newlines are stripped from the input sources.list, meaning that they have to be replaced on output. Since we're reading zero bytes every time, we're writing a zero-byte string on every loop iteration followed by a newline. This will continue until the disk on which sources.list exists is full. I'm not sure if the bug is in apt or in libstdc++, since it is an ifstream that's acting badly, but since the behavior is easily duplicated in apt, that's where I'm filing. [Sorry, Matt, for getting to this late; things have been busy at Progeny the past week...]
