Final migration of release code off of Travis CI. (#12239)

* Initial version of release workflow.

* Remove release code from Travis config.

Final removal of the Travis CI code will be handled separately.

* Do not push changes if not running in GHA.

This simplifies testing the core logic locally.

* Remove remote branch existence checking.

It is not strictly nesescary for the expected execution context, and it
makes it harder to test locally safely.

* Fixed some minor oversights.

* Make git config repo local to make testing easier.

1 files changed, 215 insertions, 0 deletions

diff --git a/.github/scripts/prepare-changelog.sh b/.github/scripts/prepare-changelog.sh
new file mode 100755
index 0000000000..4823112bac
--- /dev/null
+++ b/.github/scripts/prepare-changelog.sh
@@ -0,0 +1,215 @@
+#!/bin/sh
+
+set -e
+
+REPO="${1}"
+EVENT_NAME="${2}"
+EVENT_TYPE="${3}"
+EVENT_VERSION="${4}"
+
+##############################################################
+# Utility functions
+
+generate_changelog() {
+    echo "::group::Generating changelog"
+
+    if [ -n "${1}" ]; then
+        OPTS="--future-release ${1}"
+    fi
+
+    # shellcheck disable=SC2086
+    docker run -it -v "$(pwd)":/project markmandel/github-changelog-generator:latest \
+               --user "netdata" \
+               --project "netdata" \
+               --token "${GITHUB_TOKEN}" \
+               --since-tag "v1.10.0" \
+               --unreleased-label "**Next release**" \
+               --no-issues \
+               --exclude-labels "stale,duplicate,question,invalid,wontfix,discussion,no changelog" \
+               --max-issues 500 \
+               --bug-labels IGNOREBUGS ${OPTS}
+
+    echo "::endgroup::"
+}
+
+commit_changes() {
+    branch="${1}"
+    msg="${2}"
+    tag="${3}"
+
+    echo "::group::Committing changelog and version file and pushing changes."
+
+    git checkout "${branch}"
+    git add packaging/version CHANGELOG.md
+    git commit -m "[ci skip] ${msg}"
+    if [ -n "${tag}" ]; then
+        git tag "${tag}"
+        opts="--tags"
+    fi
+
+    if [ -n "${GITHUB_ACTIONS}" ]; then
+        git push -u origin ${opts} "${branch}"
+    else
+        echo "Not pushing changes as we are not running in GitHub Actions."
+        echo "Would have pushed ${branch} to origin, with additional options '${opts}'"
+    fi
+
+    echo "::endgroup::"
+}
+
+##############################################################
+# Version validation functions
+
+check_version_format() {
+    if ! echo "${EVENT_VERSION}" | grep -qE '^v[[::digit::]]+\.[[::digit::]]+\.[[::digit::]]+$'; then
+        echo "::error::The supplied version (${EVENT_VERSION}) is not a valid version string."
+        return 1
+    fi
+}
+
+patch_is_zero() {
+    if ! echo "${EVENT_VERSION}" | grep -qE '^v[[::digit::]]+\.[[::digit::]]+\.0$'; then
+        echo "::error::The patch number for a ${EVENT_TYPE} build must be 0."
+        return 1
+    fi
+}
+
+minor_is_zero() {
+    if ! echo "${EVENT_VERSION}" | grep -qE '^v[[::digit::]]+\.0';  then
+        echo "::error::The minor version number for a ${EVENT_TYPE} build must be 0."
+        return 1
+    fi
+}
+
+major_matches() {
+    current_major="$(cut -f 1 -d '-' packaging/version | cut -f 1 -d '.' | cut -f 2 -d 'v')"
+    target_major="$(echo "${EVENT_VERSION}" | cut -f 1 -d '.' | cut -f 2 -d 'v')"
+
+    if [ "${target_major}" != "${current_major}" ]; then
+        echo "::error::Major version mismatch, expected ${current_major} but got ${target_major}."
+        return 1
+    fi
+}
+
+minor_matches() {
+    current_minor="$(cut -f 1 -d '-' packaging/version | cut -f 2 -d '.')"
+    target_minor="$(echo "${EVENT_VERSION}" | cut -f 2 -d '.')"
+
+    if [ "${target_minor}" != "${current_minor}" ]; then
+        echo "::error::Minor version mismatch, expected ${current_minor} but got ${target_minor}."
+        return 1
+    fi
+}
+
+check_for_existing_tag() {
+    if git tag | grep -qE "^${EVENT_VERSION}$"; then
+        echo "::error::A tag for version ${EVENT_VERSION} already exists."
+        return 1
+    fi
+}
+
+check_newer_major_version() {
+    current="$(cut -f 1 -d '-' packaging/version | cut -f 1 -d '.' | cut -f 2 -d 'v')"
+    target="$(echo "${EVENT_VERSION}" | cut -f 1 -d '.' | cut -f 2 -d 'v')"
+
+    if [ "${target}" -le "${current}" ]; then
+        echo "::error::Version ${EVENT_VERSION} is not newer than the current version."
+        return 1
+    fi
+}
+
+check_newer_minor_version() {
+    current="$(cut -f 1 -d '-' packaging/version | cut -f 2 -d '.')"
+    target="$(echo "${EVENT_VERSION}" | cut -f 2 -d '.')"
+
+    if [ "${target}" -le "${current}" ]; then
+        echo "::error::Version ${EVENT_VERSION} is not newer than the current version."
+        return 1
+    fi
+}
+
+check_newer_patch_version() {
+    current="$(cut -f 1 -d '-' packaging/version | cut -f 3 -d '.')"
+    target="$(echo "${EVENT_VERSION}" | cut -f 3 -d '.')"
+
+    if [ "${target}" -le "${current}" ]; then
+        echo "::error::Version ${EVENT_VERSION} is not newer than the current version."
+        return 1
+    fi
+}
+
+##############################################################
+# Core logic
+
+git config user.name "netdatabot"
+git config user.email "bot@netdata.cloud"
+
+if [ "${REPO}" != "netdata/netdata" ]; then
+    echo "::notice::Not running in the netdata/netdata repository, not queueing a release build."
+    echo "::set-output name=run::false"
+elif [ "${EVENT_NAME}" = 'schedule' ] || [ "${EVENT_TYPE}" = 'nightly' ]; then
+    echo "::notice::Preparing a nightly release build."
+    LAST_TAG=$(git describe --abbrev=0 --tags)
+    COMMITS_SINCE_RELEASE=$(git rev-list "${LAST_TAG}"..HEAD --count)
+    NEW_VERSION="${LAST_TAG}-$((COMMITS_SINCE_RELEASE + 1))-nightly"
+    generate_changelog "" || exit 1
+    echo "${NEW_VERSION}" > packaging/version || exit 1
+    commit_changes master "Update changelog and version for nightly build: ${NEW_VERSION}."
+    echo "::set-output name=run::true"
+    echo "::set-output name=ref::master"
+elif [ "${EVENT_TYPE}" = 'patch' ] && [ "${EVENT_VERSION}" != "nightly" ]; then
+    echo "::notice::Preparing a patch release build."
+    check_version_format || exit 1
+    check_for_existing_tag || exit 1
+    branch_name="$(echo "${EVENT_VERSION}" | cut -f 1-2 -d '.')"
+    if [ -z "$(git branch --list "${branch_name}")" ]; then
+        echo "::error::Could not find a branch for the ${branch_name}.x release series."
+        exit 1
+    fi
+    git checkout "${branch_name}"
+    minor_matches || exit 1
+    major_matches || exit 1
+    check_newer_patch_number || exit 1
+    generate_changelog "${EVENT_VERSION}" || exit 1
+    echo "${EVENT_VERSION}" > packaging/version || exit 1
+    commit_changes "${branch_name}" "Patch release ${EVENT_VERSION}." "${EVENT_VERSION}" || exit 1
+    echo "::set-output name=run::true"
+    echo "::set-output name=ref::${EVENT_VERSION}"
+elif [ "${EVENT_TYPE}" = 'minor' ] && [ "${EVENT_VERSION}" != "nightly" ]; then
+    echo "::notice::Preparing a minor release build."
+    check_version_format || exit 1
+    patch_is_zero || exit 1
+    major_matches || exit 1
+    check_newer_minor_version || exit 1
+    check_for_existing_tag || exit 1
+    branch_name="$(echo "${EVENT_VERSION}" | cut -f 1-2 -d '.')"
+    if [ -n "$(git branch --list "${branch_name}")" ]; then
+        echo "::error::A branch named ${branch_name} already exists in the repository."
+        exit 1
+    fi
+    git branch "${branch_name}"
+    git checkout "${branch_name}"
+    generate_changelog "${EVENT_VERSION}" || exit 1
+    echo "${EVENT_VERSION}" > packaging/version || exit 1
+    commit_changes "${branch_name}" "Minor release ${EVENT_VERSION}." "${EVENT_VERSION}" || exit 1
+    echo "::set-output name=run::true"
+    echo "::set-output name=ref::${EVENT_VERSION}"
+elif [ "${EVENT_TYPE}" = 'major' ] && [ "${EVENT_VERSION}" != "nightly" ]; then
+    echo "::notice::Preparing a major release build."
+    check_version_format || exit 1
+    minor_is_zero || exit 1
+    patch_is_zero || exit 1
+    check_newer_major_version || exit 1
+    check_for_existing_tag || exit 1
+    generate_changelog "${EVENT_VERSION}" || exit 1
+    echo "${EVENT_VERSION}" > packaging/version || exit 1
+    commit_changes master "Major release ${EVENT_VERSION}." "${EVENT_VERSION}" || exit 1
+    echo "::set-output name=run::true"
+    echo "::set-output name=ref::${EVENT_VERSION}"
+else
+    echo '::error::Unrecognized release type or invalid version.'
+    exit 1
+fi
+
+# shellcheck disable=SC2002
+echo "::set-output name=version::$(cat packaging/version | sed 's/^v//' packaging/version)"