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@jameswilson
Created October 30, 2023 14:09
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Cohesion Git History explorer
#/bin/bash
# For an unknown reason, the Acquia Site Studio repositories package their
# releases in a way that prevents comparing code changes between releases.
# Maybe this is intentional as a kind of security through obscurity. Maybe it
# is unintentional and just a part of a flawed release practice. Either way,
# the source code is GPL'ed on Github which lends itself to being able to track
# the changes between versions. That is exactly what this script does.
##
## Usage:
## ./cohesion_git_history.sh https://github.com/acquia/cohesion
## ./cohesion_git_history.sh https://github.com/acquia/cohesion-theme
##
## After executing these commands you'll end up with two folders in the current
## directory, one for cohesion and one for cohesion-theme that contain a proper
## git history constructed between releases that can be used to understand and
## inspect code changes incurred for each release.
##
## You can then leverage git history exploration tooling such as Sublime Merge
## or `git` commands to see and compare differences between versions:
##
## cd cohesion
## git diff 7.3.1..7.3.2
## cd ../cohesion-theme
## git diff 7.3.1..7.3.2
#
# Uncomment to show commands output.
# set -x
set -e
# Silence output from pushd.
pushd () {
command pushd "$@" > /dev/null
}
# Silence output from popd.
popd () {
command popd "$@" > /dev/null
}
# Show usage text if no argument is specified.
if [ -z "$1" ]; then
sed -n 's/^##//p' $(basename "$0")
exit 1;
fi
repo=$1
project_name=$(echo $repo | cut -d"/" -f5)
rm -rf $project_name
mkdir -p $project_name
mkdir -p .cache/
pushd $project_name
git init . --quiet
popd
refs=$(git ls-remote --refs --tags $repo '*.*.*' | sed -E 's/^[[:xdigit:]]+[[:space:]]+refs\/tags\/(.+)/\1/g')
for ref in $refs; do
if [[ ! -f ".cache/$project_name-$ref.tar.gz" ]]; then
echo "downloading $repo/archive/$ref.tar.gz"
curl --silent -L $repo/archive/$ref.tar.gz --output ".cache/$project_name-$ref.tar.gz"
else
echo "skipping $repo/archive/$ref.tar.gz - .cache/$project_name-$ref.tar.gz file exists"
fi
pushd $project_name
find . -not -path "./.git/*" -not -name ".git" -delete
popd
tar zxf .cache/$project_name-$ref.tar.gz --strip-components 1 -C $project_name
pushd $project_name
git add .
git commit -m "$ref"
popd
done
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