QEMU is not correctly detecting host CDs

[Natalia Portillo]

QEMU's block layer contains code for detecting and using ioctls when real CD-ROM host devices are attached.

This detection is not working in some host OSes while bad implemented on anothers.

E.g., in Linux host qemu -cdrom /dev/sr0 is not detecting it as a CD-ROM
E.g., in Mac OS X host qemu asks the kernel to enumerate optical devices and the compares it to the constant string "/dev/cdrom". This is useless, that enumeration is just enough, and "/dev/cdrom" will NEVER exist in Mac OS X unless manually created by the user.

[Cole Robinson (crobinso)]

The linux /dev/sr0 issue should be fixed upstream:

http://git.savannah.gnu.org/cgit/qemu.git/commit/?id=3baf720e6b920d583ce2834d05e5a4e9603a1d56

Maybe it's worth a backport to stable

[Thomas Huth (th-huth)]

Looking through old bug tickets... can you still reproduce this issue with the latest version of QEMU? Or could we close this ticket nowadays?

[John Arbuckle (programmingkidx)]

I use real CD-ROM disc in Mac OS and Windows guests on my Mac OS 10.12 host. I have to run QEMU in root mode using the sudo command in order to access the CD-ROM drive. So I know QEMU's support for using real optical media on Mac OS hosts does work.

[Thomas Huth (th-huth)]

OK, thanks for the confirmation, John, so seems like this bug has been fixed in the past and we can close it now.