Comment 10 for bug 1587960

Apparently, dosfstools won't let you use lowercase labels on CentOS, while it works fine on Ubuntu:

http://paste.openstack.org/show/507193/

All the descriptions of the config drive format mention "config-2", not "CONFIG-2":

http://cloudinit.readthedocs.io/en/latest/topics/datasources.html
https://coreos.com/os/docs/latest/config-drive.html
http://docs.openstack.org/user-guide/cli_config_drive.html

Nothing is said about whether case-sensitive or -insensitive string comparison should be used for comparing of FS labels.

Looks like FAT standard does not specify how labels should be treated, but Windows (at least XP) stores those in upper-case:

"For FAT volumes, volume labels are stored as uppercase regardless of whether they contain lowercase letters. NTFS volume labels retain and display the case used when the label was created."

https://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/label.mspx?mfr=true

E.g. in Debian this was considered to be a bug and was fixed:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=714971;msg=2

It even was accepted to upstream:

https://github.com/dosfstools/dosfstools/commit/465dd8cf8f643bdd39a732e7d7f819a6abdf3d83

and made it to 3.0.22 release. We must be using an older version.