initial version

entrypoint.sh

@@ -0,0 +1,53 @@
+#!/bin/sh
+set -e
+
+if [ ! -z "${GITHUB_WORKSPACE}" ]; then
+  cd "${GITHUB_WORKSPACE}" || exit
+fi
+
+FILE="${INPUT_FILE:-Dockerfile}"
+REPO="${INPUT_REPO:-reviewdog/reviewdog}"
+VERSION_NAME="${INPUT_VERSION_NAME:-REVIEWDOG_VERSION}"
+
+# Get current version.
+CURRENT_VERSION=$(grep -oP "${VERSION_NAME}=\K\d+\.\d+\.\d+" "${FILE}")
+if [ -z "${CURRENT_VERSION}" ]; then
+  echo "cannot parse ${VERSION_NAME}"
+  exit 1
+fi
+echo "Current ${VERSION_NAME}=${CURRENT_VERSION}"
+
+# Get latest semantic version release tag name from GitHub Release API.
+GITHUB_AUTH_HEADER=""
+if [ ! -z "${INPUT_GITHUB_TOKEN}" ]; then
+  GITHUB_AUTH_HEADER="-H \"Authorization: token ${INPUT_GITHUB_TOKEN}\""
+  echo "Use INPUT_GITHUB_TOKEN to get release data."
+else
+  echo "INPUT_GITHUB_TOKEN is not available. Subscequent GitHub API call can fail due to API limit."
+fi
+
+LATEST_VERSION=$(\
+  curl -s ${GITHUB_AUTH_HEADER} https://api.github.com/repos/${REPO}/releases | \
+  jq -r '.[] | .tag_name' | \
+  sed 's/^v//' | \
+  grep -P '\d+\.\d+\.\d+' | \
+  sort --version-sort --reverse | \
+  head -n1
+)
+if [ -z "${LATEST_VERSION}" ]; then
+  echo "cannot get latest ${REPO} version"
+  exit 1
+fi
+echo "Latest ${VERSION_NAME}=${LATEST_VERSION}"
+
+if [ "${CURRENT_VERSION}" = "${LATEST_VERSION}" ]; then
+  echo "${VERSION_NAME} is latest. Nothing to do."
+  exit 0
+fi
+
+echo "Updating ${VERSION_NAME} to ${LATEST_VERSION} in ${FILE}"
+sed -i "s/\(${VERSION_NAME}=\)\([0-9]\+\.[0-9]\+\.\?[0-9]\+\)/\1${LATEST_VERSION}/" "${FILE}"
+
+echo "Updated. Commit and create Pull-Request as you need."
+echo "::set-output name=current::${CURRENT_VERSION}"
+echo "::set-output name=latest::${LATEST_VERSION}"