Re: grub2 windows 7 chainloader root=UUID

[Werner Scheinast]

Yesterday Greg White wrote:

> Is it possible to boot Windows 7 using a UUID instead of hard coding set
> root=(hd0,1)?
> Something like:
> menuentry "Windows 7" {
>     set root=UUID=4396-78D9
>     chainloader (${root})/EFI/Boot/bootx64.efi
> }

When you assign a valua to the root variable, it can only be a direct
partition specification. To specify a partition indirectly via UUID or
a given label, use the search command like
search --no-floppy --set --fs-uuid 4f7f6c976c7ecb44
search --no-floppy --set --label somenicename

The documentation of this command is rather scarce and unclear, see
http://www.gnu.org/software/grub/manual/grub.html#search
The only thing it apparently does is, with a given "--set" option, to
assign a value to the variable root, if it finds a partition with the
specified UUID or label. (You can specify a variable other than root.)
No idea what this command does without the "--set" option. Probably
nothing.

Perhaps somebody could explain it in more detail - not only here in the
list, but also in the official documentation.

Regards,
Werner