ubuntu - mount iso case sensitive

Question

I got a ISO which contains case-sensitive file/directory-names.

When mounting it on my Ubuntu 12.04 system using mount -o loop, all filenames are lowercase. There is an option called map=off, but when using that, all filenames are uppercase. What I found out during my research is, that ISO9660 doesn't support case-sensitive filenames by default. However, there is a extension called Joliet which does. My iso seems to be using joliet as it has case sensitive filenames when mounted on windows/mac os x. mkisofs does also support joliet.

However, I was not able to find a way to mount the ISO using joliet. How can I do that?

Edit:
Dmesg does log [ 149.293945] ISO 9660 Extensions: Microsoft Joliet Level 1. Not sure why it isn't used though.

Edit2: You can find the ISO here: http://sourceforge.net/projects/cloverefiboot/files/Bootable_ISO/CloverISO-1914.tar.lzma/download

Answer 1

First make sure that the Joliet extensions have been enabled for your kernel. I imagine they are since you are using Ubuntu but check anyway, just to be sure:

grep -i joliet /boot/config-`uname -r`

That should return this line:

CONFIG_JOLIET=y

If the file is missing, try searching for joliet in /proc/config.gz. I don't have this file on my system, I am repeating what I read here.

Now, assuming you do have joliet enabled, my guess is that you have a CD that is not Joliet. I tried to replicate your issue by creating a joliet iso of two case sensitive files:

$ ls foo/
Aaaaa  Bbbbb

$ genisoimage -J -R -o foo.iso foo/
I: -input-charset not specified, using utf-8 (detected in locale settings)
Total translation table size: 0
Total rockridge attributes bytes: 323
Total directory bytes: 0
Path table size(bytes): 10
Max brk space used 0
181 extents written (0 MB)

$ sudo mount ./foo.iso baz/
mount: warning: baz/ seems to be mounted read-only.  <-- ignore this, not a problem
$ ls baz
Aaaaa  Bbbbb

In other words, as long as an image was created using the Joliet extensions it should be mounted case sensitive by default. I am really not an expert on image file systems but perhaps the problem is not Joliet but something completely different. Can you mount case sensitive if you do the same steps I did above?

---

EDIT:

I downloaded your iso and get the same behavior you describe, I can't mount it case sensitive. I did find a possible reason though. I ran isoinfo on both your file and mine:

$ isoinfo -d -i Clover-1914-X64.iso | grep Joliet
Joliet with UCS level 1 found
$ isoinfo -d -i foo.iso | grep Joliet
Joliet with UCS level 3 found

I have no idea what the difference between Joliet levels 1 and 3 is but I suspect that is why your iso is not working properly. This might at least give you a new avenue of research.