How do I prompt the user from within a commit-msg hook?

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Calling exec < /dev/tty assigns standard input to the keyboard. Works for me in a post-commit git hook:

#!/bin/sh

echo "[post-commit hook] Commit done!"

# Allows us to read user input below, assigns stdin to keyboard
exec < /dev/tty

while true; do
  read -p "[post-commit hook] Check for outdated gems? (Y/n) " yn
  if [ "$yn" = "" ]; then
    yn='Y'
  fi
  case $yn in
      [Yy] ) bundle outdated --pre; break;;
      [Nn] ) exit;;
      * ) echo "Please answer y or n for yes or no.";;
  esac
done

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