Git Hooks. How to read variables from user input?

Question

I'm trying to create a pre-commit hook. And I want it to interract with user. So, I've found that I can use
read -p "Enter info: " info
Or just
read info

I created a file:
pre-commit:

#!/bin/sh
read -r input
echo $input

It just should read variable and output it. But it doesn't work. I mean it doesn't work as hook. If I run it using terminal with ./.githooks/pre-commit, everything is okay. But when I use git commit -am "Hook", it echos empty string and doesn't read anything. Am I doing something wrong?

Git version is 2.28.0.windows.1

From the docs: `Hooks can get their arguments via the environment, command-line arguments, and stdin. See the documentation for each hook below for details.`, stdin is not for user input with hooks. — dan1st, Aug 05 '20 at 04:38

score 5 · Accepted Answer · answered Aug 05 '20 at 04:37

As in this gist, you might need to take into account stderr (used by Git commands, as for instance here)

#!/bin/sh
# Redirect output to stderr.
exec 1>&2
# enable user input
exec < /dev/tty

Example of a script following those lines:

consoleregexp='console.log'
# CHECK
if test $(git diff --cached | grep $consoleregexp | wc -l) != 0
then 
  exec git diff --cached | grep -ne $consoleregexp
  read -p "There are some occurrences of console.log at your modification. Are you sure want to continue? (y/n)" yn
  echo $yn | grep ^[Yy]$
  if [ $? -eq 0 ] 
  then
    exit 0; #THE USER WANTS TO CONTINUE
  else
    exit 1; # THE USER DONT WANT TO CONTINUE SO ROLLBACK
  fi
fi

Git Hooks. How to read variables from user input?

1 Answers1