Can a Git hook automatically add files to the commit?

Question

I\'d like to add an automatically generated file to the same commit using a pre- or post-commit hook in Git, dependent on the files that were modified in that commit. How w

Answer 1

It's possible to do what you want using pre-commit hooks. We do something similar for a heroku deployment (compiling coffeescript to javascript). The reason your script isn't working is because you used the exec command improperly.

From the man page:

The exec builtin is used to replace the currently running shells process image with a new command. On successful completion, exec never returns. exec can not be used inside a pipeline.

Only your first exec command is running. After that your script is basically terminated.

Give something like this a try (as a pre-commit hook):

#!/bin/sh
files=`git diff --cached --name-status`
re=""
if [[ $files =~ $re ]]
then
  echo "Creating files"
  bundle exec create_my_files
  git add my_files
fi