AppendToFstab appends a line to fstab with the given parameters.

CheckFilesystem checks for a filesystem on a given drive using blkid.

Command executes a given command + args and returns a CommandOut struct with an error if the command fails.

CreateFilesystem executes mkfs.<desired_filesystem> on the requested drive.

CreateRaidArray runs the appropriate mdadm command for the given list of EbsVol that should be raided together.

DoesDriveExist does a single stat call to check if a drive exists.

DoesDriveExistWithTimeout makes 10 attempts, 2 second sleep between each, to stat a drive to check for its existence.

GetActualBlockDeviceName returns the actual name of the block device seen within the instance (useful for nitros).

PersistMdadm dumps the current mdadm config to /etc/mdadm.conf.

CommandOut is a struct containing the return code, stdout, and stderr of an executed command.