[syslinux] Support for btrfs multi-device - in meantime a useful error message

[poma]

On 22.07.2016 07:21, james harvey via Syslinux wrote:
> Attempting to install syslinux on a multi-device (raid1) btrfs volume
> gives the head-scratching error of:
> 
> =============================
> /boot/syslinux is device /dev/sda1
> extlinux: path /boot/syslinux doesn't match device /dev/sda1
> =============================
> 
> extlinux/main.c::validate_device_btrfs()::line 1247 returns -1 along
> with all of the other error conditions, causing this set of
> contradictory messages, and giving no indication of what the problem
> is.
> 

http://git.zytor.com/syslinux/syslinux.git/tree/extlinux/main.c#n1246
/* We do not support multi-device btrfs yet */

which corresponds to the
https://wiki.archlinux.org/index.php/Syslinux
"supports ... uncompressed single-device Btrfs file systems."