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DEVELOPER_NOTES: update board lockfile info

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Sebastien Bourdeauducq 2019-11-18 15:26:51 +08:00
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DEVELOPER_NOTES.rst
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Sharing development boards Sharing development boards
========================== ==========================
To avoid conflicts for development boards on the server, while using a board you must hold the corresponding lock file present in ``/var/lib/artiq/boards``. Holding the lock file grants you exclusive access to the board. To avoid conflicts for development boards on the server, while using a board you must hold the corresponding lock file present in the ``/tmp`` folder of the machine to which the board is connected. Holding the lock file grants you exclusive access to the board.
To lock the KC705 for 30 minutes or until Ctrl-C is pressed: For example, to lock the KC705 until ENTER is pressed:
:: ::
flock --verbose /var/lib/artiq/boards/kc705-1 sleep 1800 ssh rpi-1.m-labs.hk "flock /tmp/board_lock-kc705-1 -c 'echo locked; read; echo unlocked'"
Check that the command acquires the lock, i.e. prints something such as:
::
flock: getting lock took 0.000003 seconds
flock: executing sleep
To lock the KC705 for the duration of the execution of a shell:
::
flock /var/lib/artiq/boards/kc705-1 bash
You may also use this script:
::
#!/bin/bash
exec flock /var/lib/artiq/boards/$1 bash --rcfile <(cat ~/.bashrc; echo PS1=\"[$1\ lock]\ \$PS1\")
If the board is already locked by another user, the ``flock`` commands above will wait for the lock to be released. If the board is already locked by another user, the ``flock`` commands above will wait for the lock to be released.
To determine which user is locking a board, use: To determine which user is locking a board, use a command such as:
:: ::
fuser -v /var/lib/artiq/boards/kc705-1 ssh rpi-1.m-labs.hk "fuser -v /tmp/board_lock-kc705-1"
Selecting a development board with artiq_flash
==============================================
The board lock file also contains the openocd commands for selecting the corresponding developer board:
::
artiq_flash -I "$(cat /var/lib/artiq/boards/sayma-1)"
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