How to run a customized script after a git repo is pulled and actually updated?

Question

I'd like to run a script automatically when I pull from a repo and the repo has new commits.

I'm thinking of using git hooks but there seems to be no proper hooks for my requirements.

So any other ideas?

Answer 1

As mentioned in "Is there any git hook for pull?", you could try a post-merge hook.

See for instance:

• this gist
• this gist

They are both based on git diff-tree:

changed_files="$(git diff-tree -r --name-only --no-commit-id ORIG_HEAD HEAD)"

check_run() {
  echo "$changed_files" | grep --quiet "$1" && eval "$2"
}

That function would allow to check if a particular file has changed, and execute a command if it has.
For example:

# `npm install` and `npm prune` if the `package.json` file gets changed
# to update all the nodejs ( grunt ) dependencies deleting the unused packages (not listed into the  `package.json` file)
check_run package.json "npm install && npm prune"