pre-push GIT hook for warning on pushes to main / master / release branches

Dockerfile

FROM ubuntu:focal

# Install Dependencies
RUN apt-get update && apt-get install -y \
    curl \
    git \
    vim \
    && rm -rf /var/lib/apt/lists/*

# Setup GIT
RUN git config --global user.email test@email.com && git config --global user.name "Test User"

# Setup Pre-Push Hook
RUN mkdir -p ~/.githooks && \
    curl https://gist.githubusercontent.com/klcodanr/9cb36294d9e76c0b392b3209241ad900/raw/915f2d42d8dec5a52e1ce72b69e22d17925d6356/pre-push --output ~/.githooks/pre-push && \
    chmod +x ~/.githooks/pre-push && \
    git config --global core.hooksPath ~/.githooks/

# Setup test repostitory
RUN mkdir ~/remote && \
    cd ~/remote && \ 
    git init && \
    echo "Hello World" > README.md && \
    git add -A && \
    git commit -m "Initial commit" && \
    cd .. && \
    git clone ./remote ./local

ENTRYPOINT [ "/bin/bash" ]

pre-push

#!/bin/bash

check_branch() {
    if [[ "$remote_ref" == *"$1"* ]]; then
        echo -en "\033[1;33mYou're about to push to $remote_ref, is that what you intended? [y|n] \033[0m"
        echo -en "\033[1m"
        read -n 1 -r < /dev/tty
        echo -en "\033[0m"

        echo
        if echo $REPLY | grep -E '^[Yy]$' > /dev/null; then
            exit 0 # push will execute
        fi
        exit 1 # push will not execute
    fi
}

if read local_ref local_sha remote_ref remote_sha; then
    check_branch master
    check_branch main
    check_branch release
fi