Hi Isaac,

On Mon, Jun 29, 2015 at 10:12 AM, Isaac Dunham <ibid.ag@???> wrote:

> On Fri, Jun 26, 2015 at 04:40:33PM +0200, Didier Kryn wrote:
> > Le 25/06/2015 07:04, Jude Nelson a écrit :
> > > In time, it will also work the busybox tools, but I am still working
> on
> > >getting busybox's blkid to work here (specifically, we need the "-p"
> flag
> > >to work in order to get low-level partition table information and
> > >filesystem metadata).
> >

> >     Contrary to the other options, which only deal with formatting the
> > output, option -p cannot be emulated with a wrapper script. Have you any
> > idea of how to proceed. I am only a consumer of Busybox and have never
> tried
> > to dig into the source. Are you, or anybody in this list, able to submit
> a
> > patch to busybox blkid?

>
> What information fields from -p are needed?
>

For libudev compatibility, we will need:
* usage (e.g. filesystem, crypto_LUKS, etc.)
* filesystem type
* filesystem UUID
* subvolume UUID (where applicable)
* partition table type (e.g. dos, GPT, etc.)
* partition table UUID
* partition table entry scheme
* partition table entry type
* partition table entry size
* partition table entry offset
* partition table entry UUID
* partition table entry number
* parent disk device

Examples:

# blkid -p -o export /dev/sda
DEVNAME=/dev/sda
PTUUID=0003da58
PTTYPE=dos

# blkid -p -o export /dev/sda1
DEVNAME=/dev/sda1
UUID=67378bcc-ba07-4074-9a7e-9daef3537ad5
VERSION=1.0
TYPE=ext4
USAGE=filesystem
PART_ENTRY_SCHEME=dos
PART_ENTRY_UUID=0003da58-01
PART_ENTRY_TYPE=0x83
PART_ENTRY_NUMBER=1
PART_ENTRY_OFFSET=2048
PART_ENTRY_SIZE=195309568
PART_ENTRY_DISK=8:0

Thanks,
Jude