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1#!/bin/bash
2nvm_location="/media/nvm"
3device_node="/dev/mmcblk0"
4partition_number="4"
5partition_node="${device_node}p${partition_number}"
6previous_partition_number=$(($partition_number-1))
7previous_partition_node="${device_node}p${previous_partition_number}"
8
9create_partition () {
10
11# Start by getting the last sector of the previous partition
12last_sector=$(fdisk -l $device_node | awk -v str="$previous_partition_node" '$0~str{print $3}')
13
14# Feed input into fdisk to create the partition
15sed -e 's/\s*\([\+0-9a-zA-Z]*\).*/\1/' << EOF | fdisk ${device_node}
16  o # clear the in memory partition table
17  n # new partition
18  p # primary partition
19  ${partition_number} # partition number 
20  $(($last_sector+1))  # Start just after the end of the previous partition
21    # default - extend to the end of the disk
22  w # write the partition table
23  q # and we're done
24EOF
25}
26
27# Exit if the partition is already mounted
28if df -h | grep -q "$nvm_location"; then
29    echo "NVM partition is already mounted"
30    exit 0
31else
32    echo "NVM partition is not mounted"
33fi
34
35# Attempt to mount the NVM partition (it needs to exist in fstab)
36if mount "${nvm_location}"; then
37    echo "Successfully mounted existing NVM"
38    exit 0
39else
40    echo "Unable to mount $nvm_location partition."
41fi
42
43# We couldn't mount the partition location.  See if the partition_node exists
44if [ ! -f "$partition_node" ]; then
45    echo "Device node $partition_node does not exist"
46    # Add partition to table
47    create_partition
48    # TODO: zero out the node
49else
50    echo "Device node $partition_node already exists and should have mounted.  Something is wrong, likely with the filesystem."
51    exit 1
52fi
53
54# Attempt to mount the NVM partition
55if mount "${nvm_location}"; then
56    echo "Successfully mounted existing NVM"
57    exit 0
58else
59    echo "Unable to mount $nvm_location partition."
60fi
61
62# We couldn't mount the partiton location.  We already created the partition, so create the filesystem
63if mkfs.ext4 "$partition_node"; then
64    echo "Successfully made ext4fs"
65else
66    echo "Failed to make ext4fs"
67    # TODO: Exit with failure
68fi
69
70# Try to mount again; return the exit code
71mount "${nvm_location}"