ddpar

Attempting scripted parallel dd execution.

Usecases

local

uncrompressed

	clone (check)		backup (check)	restore (check)
block dev	✔️ (🛑)		✔️ (✔️)	✔️ (✔️)
file	✔️ (🛑)		✔️ (✔️)	✔️ (✔️)

compressed

	backup gzip (check)	restore gzip (check)
block dev	✔️ (✔️)	✔️ (✔️)
file	✔️ (✔️)	✔️ (✔️)

remote - ssh

general remote funcionality (ssh)

	state
establish_ssh_connection	✔️
execute_command	✔️
execute_remote_command	✔️
execute_remote_background_command	✔️
close_ssh_connection	✔️
check_remote_command_availability	🛑
remote_port_generation	✔️
check_remote_port_availability	✔️
output_analysis	✔️
remote_cloning_commands	⚙️
remote_backup_commands	🛑

remote - netcat

uncompressed

	clone (check)		backup (check)	restore (check)
block dev	✔️ (🛑)		🛑 (🛑)	🛑 (🛑)
file	✔️ (🛑)		🛑 (🛑)	🛑 (🛑)

local [de]compression

	backup gzip (check)	restore gzip (check)
block dev	🛑 (🛑)	🛑 (🛑)
file	🛑 (🛑)	🛑 (🛑)

remote [de]compression

	backup gzip (check)	restore gzip (check)
block dev	🛑 (🛑)	🛑 (🛑)
file	🛑 (🛑)	🛑 (🛑)

compressed transfer (compression+decompresion before and after transfer)

	clone
block dev	🛑
file	🛑

To Do

• check read/write permissions for $SOURCE, $BACKUP_BASE and $DESTINATION
• ddpar.sh:
  • Add option to give a backup a custom BASE_NAME
  • Add size check for local clone_file
  • Remove deprecated functions (currently none)
• ddpar-check.sh:
  • Add if-statement for checking if a backup as been created with a sha256sum
• ddpar-restore.sh:
  • check on file restore, if output is a file. If directory given, append basename from metadata
  • fallocate is run multiple times? (maybe only on restoring compressed block dev images?)
  • make fallocate optional
• use this BASE_NAME as path for checksum files for clones (where user request checksuming)
• echo a message if no reasonable alternative number of threads/jobs could be calculated
• when compressing an image and option -c (checksum) is given, should the script calculate the checksum of both, the raw file and the compressed file? (Currently only basefile's checksum is calculated.)
• Code to make missing features work
• Remoting:
  • Use differnt functions for remote actions like "output analysis" or implement in the existing functions?
  • Make remote input and local output work (not yet thought through)