| 1 | #!/bin/bash␊ |
| 2 | ␊ |
| 3 | echo "==============================================="␊ |
| 4 | echo "Check the Partition Scheme: GPT, GPT/MBR or MBR?"␊ |
| 5 | echo "************************************************"␊ |
| 6 | ␊ |
| 7 | # Receives passed value for the Target Disk␊ |
| 8 | # for example: /dev/disk0s2␊ |
| 9 | # Then looks for the following:␊ |
| 10 | # First 8 bytes of the GPTdiskGPTHeader to identify a GUID partition table.␊ |
| 11 | # Byte number 450 of the GPTdiskProtectiveMBR to identify ID of 'EE' to identify a GPT partition.␊ |
| 12 | # Byte numbers 466, 482 & 498 of the GPTdiskProtectiveMBR to identify further partitions.␊ |
| 13 | #␊ |
| 14 | # Exit with value 1 for GPT, 2 for GPT/MBR and 3 for MBR. ␊ |
| 15 | # Exit with value 0 if nothing is found - this shouldn't happen.?␊ |
| 16 | ␊ |
| 17 | if [ "$#" -eq 1 ]; then␊ |
| 18 | ␉targetDisk="$1"␊ |
| 19 | ␉echo "DEBUG: passed argument = $targetDisk"␊ |
| 20 | else␊ |
| 21 | ␉echo "Error - wrong number of values passed"␊ |
| 22 | ␉exit 9␊ |
| 23 | fi␊ |
| 24 | ␊ |
| 25 | ␊ |
| 26 | partitiontable=$( dd 2>/dev/null if="$targetDisk" count=1 skip=1 | dd 2>/dev/null count=8 bs=1 | perl -ne '@a=split"";for(@a){printf"%02x",ord}' )␊ |
| 27 | if [ "${partitiontable:0:16}" == "4546492050415254" ]; then␉␊ |
| 28 | ␉partitiontable=$( dd 2>/dev/null if="$targetDisk" count=1 | dd 2>/dev/null count=64 bs=1 skip=446 | perl -ne '@a=split"";for(@a){printf"%02x",ord}' )␊ |
| 29 | ␉if [ "${partitiontable:8:2}" == "ee" ]; then␊ |
| 30 | ␉␉echo "Found System ID 'EE' to identify GPT Partition"␊ |
| 31 | ␉␉if [ "${partitiontable:40:2}" == "00" ] && [ "${partitiontable:72:2}" == "00" ] && [ "${partitiontable:104:2}" == "00" ]; then␊ |
| 32 | ␉␉␉echo "Found System ID '00' for each remaining possible partition"␊ |
| 33 | ␉␉␉partitiontable="GPT"␊ |
| 34 | ␉␉␉echo "${partitiontable} found."␊ |
| 35 | ␉␉␉echo "-----------------------------------------------"␊ |
| 36 | ␉␉␉echo ""␊ |
| 37 | ␉␉␉exit 1␊ |
| 38 | ␉ ␉else␊ |
| 39 | ␉␉␉partitiontable="GPT/MBR"␊ |
| 40 | ␉␉␉echo "${partitiontable} found."␊ |
| 41 | ␉␉␉echo "-----------------------------------------------"␊ |
| 42 | ␉␉␉echo ""␊ |
| 43 | ␉␉␉exit 2␊ |
| 44 | ␉␉fi␊ |
| 45 | ␉fi␊ |
| 46 | else␊ |
| 47 | ␉partitiontable="MBR"␊ |
| 48 | ␉echo "${partitiontable} found."␊ |
| 49 | ␉echo "-----------------------------------------------"␊ |
| 50 | ␉echo ""␊ |
| 51 | ␉exit 3␊ |
| 52 | fi␊ |
| 53 | ␊ |
| 54 | echo "No partition table found."␊ |
| 55 | echo "-----------------------------------------------"␊ |
| 56 | echo ""␊ |
| 57 | exit 0 |
