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PaulWaldo
Known Participant
February 26, 2023
Question

Determine why external app call fails

  • February 26, 2023
  • 1 reply
  • 442 views

I'm creating an export plugin that calls an external app at the end of the export.  When I call it with 

local exitCode =LrTasks.execute(command)
it returns exit code 255.  I log the command and execute it from the terminal, and it works fine, returning exit code 0.  How might I diagnose the problem?
 
Thanks in advance!
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1 reply

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PaulWaldoAuthor
Known Participant
February 26, 2023

Update:

It appears that it is not the constructed command that is bad, it is something more fundamental in my construction.  This code also fails with a return code of 256

	quotedCommand = "pwd"
	local exitCode = LrTasks.execute(quotedCommand)
 
johnrellis
johnrellis
Legend
February 26, 2023

Hmm, when I execute these lines in a script in the Scripts folder:

local LrTasks = import "LrTasks"

quotedCommand = "pwd > ~/Desktop/test.log"
local exitCode = LrTasks.execute (quotedCommand)

the file "test.log" is created and the exitCode is 0.

 

As a next step, I suggest making a stripped down test export plugin with just the LrTasks.execute() line and post it here. I can poke around to see what might be the hangup.

 

 

 

P
PaulWaldoAuthor
Known Participant
February 26, 2023

Thank you for your suggestion John.  It turns out that error code was indeed valid *when run from Lightroom*. The thing that stumped me was that running it exactly as constructed on the command line ran fine.  Your suggestion about redirecting the output got thinking.  I had to look at stderr to find the answer

my_cmd &> ~/log.txt

 That indeed bore fruit.  My command produced the message 

"Unable to open output image \"out.jpg\": open out.jpg: read-only file system"

I need to put a full path on the output image created by my command.  Thanks so much for the suggestion! 

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