export: avoid error on unbound variable (IDFGH-9586)

[MarcFinetRtone]

Might stop sourcing export.sh when set -u is used (typically with direnv):

/path/to/esp-idf/export.sh:16: IDF_EXPORT_QUIET: unbound variable

[CLAassistant]

All committers have signed the CLA.

[mfialaf]

Hi @MarcFinetRtone ,
Can you please explain in more detail what issue is solving your proposal change?
What is the expected output, and what is the actual without your change?
Thanks

[MarcFinetRtone]

Hi @MarcFinetRtone , Can you please explain in more detail what issue is solving your proposal change? What is the expected output, and what is the actual without your change? Thanks

To describe here in the PR or in the commit message ?

Regarding the change:

• without the change, if set -u is used in the shell, sourcing export.sh stops on the unbound variable (and environment variables are not exported, hence idf.py is not usable). The error message is the following:

/path/to/esp-idf/export.sh:16: IDF_EXPORT_QUIET: unbound variable

• with the change sourcing export.sh works and idf is usable (because all other environment variables are set)

It's the same problem fixed by 1673183 (but don't know why IDF_QUIET (at the time) was not considered by the commit).

A workaround is to export IDF_EXPORT_QUIET (even to an empty value) prior to sourcing export.sh

[mfialaf]

@MarcFinetRtone Thank you for clearing it up for me, I can see the issue now.

While testing it, I discovered the same problem with the unbound variable with IDF_PATH on line 75.
Can you please also fix this variable so we can merge it as one fix?
Thank you.

[mfialaf]

@MarcFinetRtone Thank you for your contribution and cooperation.

[dobairoland]

sha=13e59ed7a99f6bf7ee3d851faeee1fd4b3261ea5