entrypoint.sh

#!/bin/bash -l

set -euo pipefail

git config --global --add safe.directory /github/workspace

if [[ -n "${INPUT_WORKING_DIRECTORY:-}" ]]; then
    echo "Working directory is $INPUT_WORKING_DIRECTORY"
    cd "$INPUT_WORKING_DIRECTORY"
fi

# log the latest commit data
git log -1

commit_sha=$(git rev-parse HEAD)
echo "HEAD commit SHA is $commit_sha"

short_sha=$(echo "$commit_sha" | cut -c -7)
echo "Short commit SHA is $short_sha"

branch=$(git branch --show-current)
echo "HEAD branch is $branch"

# not set if not in an action workflow. https://docs.github.com/en/actions/reference/environment-variables
if [ -n "${GITHUB_HEAD_REF:-}" ]; then
    is_pr=true
    pr_head=${GITHUB_HEAD_REF}
    pr_base=${GITHUB_BASE_REF}

    echo "This workflow is a PR from ${GITHUB_HEAD_REF} targeting ${GITHUB_BASE_REF}"
else
    is_pr=false
    pr_head=""
    pr_base=""
    echo "Not a PR workflow"
fi

tags=$(git tag --points-at HEAD | xargs)
tag=$(echo "$tags" | awk '{ print $1 }')
tags_count=$(echo "$tags" | wc -w | xargs)

if [ -z "$tags" ]; then
    echo "No tags point to this commit"
elif [ 1 -eq "$tags_count" ]; then
    echo "Tag $tags points to this commit"
else
    echo "$tags_count tags point to this commit: $tags"
fi

echo "branch=${branch}" >> "$GITHUB_OUTPUT"
echo "is_pr=${is_pr}" >> "$GITHUB_OUTPUT"
echo "pr_head=${pr_head}" >> "$GITHUB_OUTPUT"
echo "pr_base=${pr_base}" >> "$GITHUB_OUTPUT"
echo "short_sha=${short_sha}" >> "$GITHUB_OUTPUT"
echo "tag=${tag}" >> "$GITHUB_OUTPUT"
echo "tags=${tags}" >> "$GITHUB_OUTPUT"
echo "tags_count=${tags_count}" >> "$GITHUB_OUTPUT"