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Usually, when you open a file, Emacs prompts you to run M-x make-directory RET RET if the directory doesn't exist.

However, after writing my own advice, I realized that opening files in directories that don't exist was giving me a lot of errors. After digging a bit, I found that apparently make-process tries to set the current directory to the buffer's default-directory. Since it doesn't exist yet, it fails with an error saying that setting the directory didn't work.

Is there a way to prevent this, and still have the make-process command work? I looked at the keyword arguments, but I couldn't find any that would prevent the working directory from being set.

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    If you can control the keyword arguments you can also wrap make-process into a let-form binding default-directory locally to the name of an existing directory.
    – Tobias
    Commented Jun 13, 2018 at 8:52

2 Answers 2

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Reading in make-process comments about "current buffer's current directory", assume this is a bug. Can't see why a buffer connected to a process must have a file resp. filename. Seems worth a bug-report.

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  • To make sure I explained this correctly, let me elaborate a bit. I meant that when you create a process with make-process, Emacs tries to set the working directory of the process to the default directory of the current buffer. I didn't mean that the buffer it creates (i.e. the buffer key in the arguments) has that set as its default directory. Reading your answer, I thought you might have thought I meant the second one, and not the first. Commented Jun 14, 2018 at 9:59
  • @ParhamDoustdar AFAIU make-process assumes an existing buffer-file-name leading to determine the current directory. But such assumption isn't justified when just creating a buffer. Commented Jun 14, 2018 at 10:58
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The straightforward solution seems to be to simply wrap the call-process or make-process call with with-existing-directory.

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