Pre Actions not triggered

[hasenradball]

Dear PIO Team,I wanted to trigger some pre action for an ESP32 build to prepare some Web files.I did the following:

1.) create a pre_build.py file like:

# Custom actions when building program/firmware

def before_build(source, target, env):
  print("Prepare headers before build")
  # do stuff before build

env.AddPreAction("build", before_build)

2.) add pre:prebuild_sript.py to my env

[env]
platform = https://github.com/pioarduino/platform-espressif32/releases/download/stable/platform-espressif32.zip
framework = arduino
extra_scripts = pre:pre_build.py

But “print Prepare headers before build does not apear when I build.

What doe I make wrong?

The complete File looks like:

[maxgerhardt]

Same with buildprog instead of build?

Might also be related to

Advanced scripting: script wont run

Is it still true that it’s not possible to define a pre action to the buildprog target? If so, why does the documentation Pre & Post Actions — PlatformIO latest documentation specifically use this as an example: # Custom actions when building program/firmware # env.AddPreAction("buildprog", callback...) Of course, I write here because I also fail to do this. Running the code directly in the extra script would mean I won’t get any advantages of SCons, such as only rebuilding when it’s necessa…

[hasenradball]

Hi MaxGerhardt,

yes same with “buildprog” or “build”.
The strange thing is the post programm action works but the pre actions does not occur.

[maxgerhardt]

I think it would be vaoid to immediately execute the “pre build” function directly in the script, without it being attached to a pre action. Like, a direct function call to whetever you want to do.

[hasenradball]

You mean directly after line 3 ?
The print of the
“Current CLI…” and “Current Build targets” occur as empty array.

Can i call a bash script here in this file?
Do i need some subprocess stuff then?

[maxgerhardt]

No, instead of

@hasenradball

env.AddPreAction("build", before_build)

do

before_build(None, None, env)

[hasenradball]

Wait a minute….

I saw actually the first time the output of the preaction but it is not repoducable

[maxgerhardt]

Clean and build?

pio run -t clean
pio run

on CLI.

[hasenradball]

Here see my image it appears at last after build…

see last line in pic.

[hasenradball]

This works like:

[hasenradball]

Any Idea to run a shell script in the pre_build.py script?

[maxgerhardt]

import subprocess
import shlex
subprocess.call(shlex.split('./test.sh param1 param2'))

[hasenradball]

Tried already but get permission denied.

[maxgerhardt]

1. Script path may need to be absolute
2. May need chmod +x test.sh
3. test.sh must exist
4. maybe try it with shell=True as additional parameter in subprocess.call()
5. otherwise explicitly /bin/sh /test.sh instead of ./test.sh.

[hasenradball]

Great Stuff!

can now build webpack header files before build.

[hasenradball]

Thank you so much !

[maxgerhardt]

If it’s just about GZipping, you may find it better to use the filesystem approach for the ESP32: You can just place the files verbatim in data/, build a filesystem and upload that. Then the [Question] ESP32: Compress files in Data to GZip before upload possible to SPIFFS? - #15 by szerintedmi can auto GZIP compress the files before upload, so the ESP32’s webserver serves compressed files.

[hasenradball]

Hi, no its not about gzip only.

1.) compile the Webfiles as minified files

2.) copy to data folder

3.) gzip files

4.) use xxd to create hexdump c-strings

5.) Add PROGMEM to it

6.) create include header files

=> to send from flash not from filesystem, it is said its faster than filesystem.