Hard drive dock notes

From LinuxMCE
Revision as of 02:40, 12 November 2013 by Tschak909 (Talk | contribs) (Initial Content.)

(diff) ←Older revision | view current revision (diff) | Newer revision→ (diff)
Jump to: navigation, search

LinuxMCE can almost support hard drive docking. But some pieces need to be engineered to facilitate the process. --Tschak909 02:40, 12 November 2013 (UTC)

UI Components

  • Manage Hard Drive screen
  • Attach Eject to hard drive button, make hidden if not removable disk.
  • Disk is Ready for use, alert.
  • Format Disk screen, with disk name, and "Windows or LinuxMCE" button.

Database Components

  • Add Is Removable device data, so that we can do additional UI behavior

Script components

Eject_Removable_DIsk.sh

  • Add Eject_Removable_Disk.sh which given a device #, and an Orbiter Device #, will do the following:
    • Stop UpdateMedia
    • Throw a lock "HardDriveEjected"
      • all StorageDevices_* scripts will WaitLock this, so that they are suspended while disk ejection happens.
    • exportfs -u the affected NFS share, on ALL media directors (TODO: Find out how best to do this, can StorageDevices_Setup.sh be used to this end?)
    • Unmount disk immediately.
    • Indicate that the Disk is safe to be removed by CMD_Display_Alert to orbiter PK_Device specified in second parameter.
    • Loop Wait for USB device to disappear from system, courtesy of UDEV (we keep the UUID, so we can track when this disk actually falls away. Loop.
    • When disk falls away, relinquish the lock.
    • Run StorageDevices_Setup.sh
    • Restart UpdateMedia

Format_Removable_Disk.sh

  • Given a raw device path, and a filesystem name (ext3, ext4, xfs, jfs):
    • If disk is blank, Create a single partitionformat it with the given filesystem.
      • If the requested filesystem is NTFS, or FAT32, use the appropriate Microsoft compatible partition
      • Otherwise, use Linux partition.
    • If disk is not blank, politely exit with a non zero error code.

StorageDevices_Setup.sh

  • While traversing disks to setup, find related interface parent given UUID.
    • If UUID belongs to a USB or eSATA channel, immediately assume that this disk is removable. Set Is Removable device data to true for this device.
      • If disk is indeed removable, and it now shows up, look at PK_Users device data, and run UpdateMedia for the affected paths immediately.

User Facing Behavior

This is preliminary, and subject to refinement, but I believe this will provide the following user facing behavior:

If this disk is Blank

  • Show format screen.
  • User formats disk
  • User is then presented with the usual "Found a disk" screen.

If disk is already in device tree

  • Simple notice will be shown top left, that disk is being added.
  • Once UpdateMedia is done, then alert will be shown indicating to user that disk is ready to be used.

If Disk hasn't been placed in device tree

  • Orbiter will ask whether user wants to use disk using usual methods.