Recover system $TMPDIR for emacsclient

[tshu-w]

Try to fix: #17334,

I'm not sure if Etc.systmpdir is equal to TMPDIR, but it works for me.

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[Bo98]

Seems ok but might not work if someone sets a custom TMPDIR, so a full fix might be to store the original TMPDIR somewhere like we do for PATH.

[tshu-w]

like we do for PATH.

Would you mind share the code about this?

By the way, @MikeMcQuaid asks me to modify only the Library/Homebrew/dev-cmd/edit.rb, in which case I cannot save the original TMPDIR.

[MikeMcQuaid]

By the way, @MikeMcQuaid asks me to modify only the Library/Homebrew/dev-cmd/edit.rb, in which case I cannot save the original TMPDIR.

@tshu-w It's ok to have TMPDIR added to this list:

brew/bin/brew

Line 185 in 7683b22

# We don't want to take the user's value for, e.g., `HOMEBREW_PATH` here!

this will set HOMEBREW_TMPDIR which you can then use ENV["TMPDIR"] = ENV["HOMEBREW_TMPDIR"] or similar to set back in dev-cmd/edit.rb

[tshu-w]

As suggested by @Bo98 @MikeMcQuaid, I open a new #18260.

[MikeMcQuaid]

@tshu-w Thanks! For future reference: feel free to just push (force pushing if necessary) to existing PRs.