How to install an old version of a brew package

install-old-brew-package.sh

#!/bin/bash

# 6.29.3 ~ https://github.com/twmht/python-rocksdb/issues/47#issuecomment-1678961102

PACKAGE_NAME=rocksdb
PACKAGE_VERSION=6.29.3

# Clone the main Homebrew repo
git clone https://github.com/Homebrew/homebrew-core
cd homebrew-core

# Find the commit hash associated with the version we want (b3597b729a2)
commit=$(git log --oneline -- Formula/$PACKAGE_NAME.rb | grep -m 1 $PACKAGE_VERSION | cut -d ' ' -f1)

# Checkout the selected commit
git checkout $commit

# Install the package
brew install Formula/$PACKAGE_NAME.rb

# Fix the package version
brew pin $PACKAGE_NAME