[riot-notifications] [RIOT-OS/RIOT] Makefile.include: set default PROGRAMMER value when flahsing on IoT-LAB (#12317)

Alexandre Abadie notifications at github.com
Fri Sep 27 17:19:12 CEST 2019


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### Contribution description

This will avoid to load all edbg programmer management logic from a board Makefile.include and especially will avoid to add edbg to the list of FLASHDEPS: it won't be unnecessarily built when flashing a samr21-xpro/arduino-zero board on IoT-LAB.

The idea is to set a default value to the PROGRAMMER variable when IOTLAB_NODE is set (the arbitrary `iotlab` value is used) before the Makefile.include from the board is included. This way all edbg logic is skipped (including the addition to FLASHDEPS).

Also note that in master, issuing a flash command for samr21-xpro or arduino-zero from an IoT-LAB SSH Frontend is broken because edbg cannot be built on the fly (due to missing libudev libraries).

@cladmi, what's opinion on this fix ?

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### Testing procedure

1. Start an experiment on IoT-LAB with a samr21-xpro or arduino-zero board:
```
$ iotlab-experiment submit -n "" -d 20 -l saclay,samr21,1
$ iotlab-experiment wait
```
2. 2 cases:
  - Locally, ensure that you don't have edbg already built/available (in dist/tools) and flash the board from your machine:
    ```
    $ make BOARD=samr21-xpro IOTLAB_NODE=auto-ssh -C examples/hello-world
    ```
    => on master, edbg is rebuilt before flashing on IoT-LAB. With this PR, only `iotlab-node --update` is called

  - On the SSH frontend:
    ```
    $ ssh <login>@saclay.iot-lab.info
    $ cd RIOT
    $ make BOARD=samr21-xpro IOTLAB_NODE=auto-ssh -C examples/hello-world
    ``` 
    => on master, the last command fails. With this PR, the board is flashed correctly.
  

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### Issues/PRs references

Related to #9694

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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/12317

-- Commit Summary --

  * Makefile.include: set default PROGRAMMER value when flahsing on IoT-LAB

-- File Changes --

    M Makefile.include (5)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/12317.patch
https://github.com/RIOT-OS/RIOT/pull/12317.diff

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