On Mon, Sep 22, 2014 at 12:19 PM, Andrei Borzenkov <arvidj...@gmail.com> wrote: > В Mon, 22 Sep 2014 11:59:06 -0700 > Michael Marineau <michael.marin...@coreos.com> пишет: > >> This introduces a new type() function for partmaps modeled after the >> label() and uuid() functions for filesystems. A likely future extension >> will be support partition labels and uuids as well. > > Is there other partition type beyond GPT that supports it? What > advantages it has over using filesystem label or uuid?
From a quick glance through the other partmap modules looks like amiga has parttype and apple has a parttype and partname. msdos of course just has one byte types. As far as I can tell it is only GPT that has all three: type, label, and uuid. I've started with just type since that is what I need to make use of and copying the code to re-read the type field yet again felt silly. My final goal is actually a module that will search for two partitions of the same type and select between them based on some other metadata. Since searching by partition type is already a common task in the grub code base providing an API to do so seemed like a good starting point. Others will likely find extending this to support label and uuid more useful. For example with GPT the Linux kernel can use "root=PARTUUID=<someuuid>" directly, unlike LABEL= or UUID= which must be implemented in an initrd. > >> This is in >> preparation for adding more functionality like a search.part_type >> command. >> > > What is use case? search is expected to return a single object; but you > cannot presume uniqueness of partition of given type. That's different > from label or uuid. search.part_type is really just a useful test case for me but it could be useful for finding the EFI System partition and similar special boot partitions. It will be easy to extend to support search.part_label or search.part_uuid which would be useful when paired with root=PARTUUID= or when the filesystem information is unknown or not significant. _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
