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  1. #!/bin/bash
  2. nvm_location="/media/nvm"
  3. device_node="/dev/mmcblk0"
  4. partition_number="4"
  5. partition_node="${device_node}p${partition_number}"
  6. previous_partition_number=$(($partition_number-1))
  7. previous_partition_node="${device_node}p${previous_partition_number}"
  8.  
  9. create_partition () {
  10.  
  11. # Start by getting the last sector of the previous partition
  12. last_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
  15. sed -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
  24. EOF
  25. }
  26.  
  27. # Exit if the partition is already mounted
  28. if df -h | grep -q "$nvm_location"; then
  29.     echo "NVM partition is already mounted"
  30.     exit 0
  31. else
  32.     echo "NVM partition is not mounted"
  33. fi
  34.  
  35. # Attempt to mount the NVM partition (it needs to exist in fstab)
  36. if mount "${nvm_location}"; then
  37.     echo "Successfully mounted existing NVM"
  38.     exit 0
  39. else
  40.     echo "Unable to mount $nvm_location partition."
  41. fi
  42.  
  43. # We couldn't mount the partition location.  See if the partition_node exists
  44. if [ ! -f "$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
  49. else
  50.     echo "Device node $partition_node already exists and should have mounted.  Something is wrong, likely with the filesystem."
  51.     exit 1
  52. fi
  53.  
  54. # Attempt to mount the NVM partition
  55. if mount "${nvm_location}"; then
  56.     echo "Successfully mounted existing NVM"
  57.     exit 0
  58. else
  59.     echo "Unable to mount $nvm_location partition."
  60. fi
  61.  
  62. # We couldn't mount the partiton location.  We already created the partition, so create the filesystem
  63. if mkfs.ext4 "$partition_node"; then
  64.     echo "Successfully made ext4fs"
  65. else
  66.     echo "Failed to make ext4fs"
  67.     # TODO: Exit with failure
  68. fi
  69.  
  70. # Try to mount again; return the exit code
  71. mount "${nvm_location}"
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