• Have you checked if problem occurs with fish 2.4.0?
• Tried fish without third-party customizations (check sh -c 'env HOME=$(mktemp -d) fish')?

fish version installed (fish --version): fish, version 2.3.1

OS/terminal used: Debian Linux (jessie), xterm

I wrote a script using #!/usr/bin/fish. The script calls read. Works fine from command line but not when called from another script.

Reproduction steps

nr@homedog ~/net> call-fish-read 
fish: Couldn't grab control of terminal
tcsetpgrp: Interrupted system call

nr@homedog ~/net> fish-read
say something⏎                                                                  asdf

asdf
nr@homedog ~/net> /usr/bin/fish --version
fish, version 2.3.1-dirty

Scripts are attached in a zip file, but it may be easier to view source here.

Here is fish-read:

#!/usr/bin/fish

read -p 'echo -n say something >&2 ' -l -s answer
echo $answer

and here is call-fish-read:

#!/bin/ksh

mumble=$(fish-read)
echo $mumble

N.B. I downloaded a nightly of fish 2.4.0 from SUSE, and behavior is even more frustrating---the shell just hangs trying to read file descriptor 3. Not sure what's up with that (I poked at it with strace -f.)

Would love to have a workaround that enables me to use a fish script as a tool in other scripts.
demo-scripts.zip

May be related to #3223 and #1258.