[CORE][SECO-MODULE] Add commands to search TYPEGUID/PARTUUID from disk and viceversa

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1. Added commands allow to search disks by type GUID and partition UUID.

Test example:

• debug prints ON
• two partitions with the same typeguid

a. Test searching for the first partition encountered with the selected typeguid:

grub> get_disk_by_typeguid 5b193300-fc78-40cd-8002-e86c45580b47 --max-disks 1 --setenv typeguid_disks
Searching for TYPEGUID: 5b193300-fc78-40cd-8002-e86c45580b47
Argument 1. Parsed maximum number of disks: (1)

Processing the device: hd0 
error: this is not a GPT partition table: hd0.

Processing the device: hd0,gpt3 
Found TYPEGUID: 5b193300-fc78-40cd-8002-e86c45580b47
Found matching device: hd0,gpt3.
Matched devices count: 1.
Found disks: hd0,gpt3
Found disks count: 1
grub> echo $typeguid_disks                                                                         
hd0,gpt3

b. Test searching for the maximmum number of partitions with the selected typeguid (the maximum is 2 partitions se by MAX_SLOTS in the code):

grub> get_disk_by_typeguid 5b193300-fc78-40cd-8002-e86c45580b47 --setenv typeguid_disks
Searching for TYPEGUID: 5b193300-fc78-40cd-8002-e86c45580b47

Processing the device: hd0 
error: this is not a GPT partition table: hd0.

Processing the device: hd0,gpt3 
Found TYPEGUID: 5b193300-fc78-40cd-8002-e86c45580b47
Found matching device: hd0,gpt3.
Matched devices count: 1.

Processing the device: hd0,gpt2 
Found TYPEGUID: 5b193300-fc78-40cd-8002-e86c45580b47
Found matching device: hd0,gpt3 hd0,gpt2.
Matched devices count: 2.
Found disks: hd0,gpt3 hd0,gpt2
Found disks count: 2

The resulting list can be processed with a for loop in the bootscript as such:

for disk in ${typeguid_disks}; do
    echo "Disk found: ${disk}"
done

obtaining:

Disk found: hd0,gpt3
Disk found: hd0,gpt2

• Add the option to sort from the lowest GPT number to the higher
• Add the option to filter by device (i.e. search only in hd0)

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2. Add commands to retrieve the PARTUUID/TYPEGUID from disk name.

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3. Add basic_setexpr command to evaluate simple math operations without using LUA scripting. For complex math LUA is still required.

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4. Add get_disk_name command to get the device from (device,partition). For example:

get_disk_name (hd0,gpt1) --setenv output.
echo $output
hd0

Signed-off-by: Nicola Sparnacci nicola.sparnacci@seco.com