Add changelog and version scripts to automate releases (#36099)

* Add changelog and version scripts to automate releases

* not always replacing the first line

* make copyrightfix

scripts/changelog.sh

@@ -0,0 +1,80 @@
+#!/usr/bin/env bash
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: BUSL-1.1
+
+
+set -uo pipefail
+
+function usage {
+  cat <<-'EOF'
+Usage: ./changelog.sh <command> [<options>]
+
+Description:
+  This script will update CHANGELOG.md with the given version and date.
+
+Commands:
+  prepare <version> <date>
+    prepare updates the first line in the CHANGELOG.md file with the
+    given version and date.
+
+    ./changelog.sh prepare 1.0.0 "November 1, 2021"
+
+  cleanup <released-version> <next-version>
+    cleanup prepends a new section to the CHANGELOG.md file with the given
+    version and (Unreleased) as the date. If the released version contains a
+    pre-release tag, the next version will replace the top line instead of
+    inserting a new section.
+EOF
+}
+
+function prepare {
+  VERSION="${1:-}"
+  DATE="${2:-}"
+
+  if [[ -z "$VERSION" || -z "$DATE" ]]; then
+    echo "missing at least one of [<version>, <date>] arguments"
+    usage
+    exit 1
+  fi
+
+  sed -i '' -e "1s/.*/## $VERSION ($DATE)/" CHANGELOG.md
+}
+
+function cleanup {
+  RELEASED_VERSION="${1:-}"
+  NEXT_VERSION="${2:-}"
+
+  if [[ -z "$RELEASED_VERSION" || -z "$NEXT_VERSION" ]]; then
+    echo "missing at least one of [<released-version>, <next-version>] arguments"
+    usage
+    exit 1
+  fi
+
+  if [[ "$RELEASED_VERSION" == *-* ]]; then
+    # then we have a pre-release version, so we should replace the top line
+    sed -i '' -e "1s/.*/## $NEXT_VERSION (Unreleased)/" CHANGELOG.md
+  else
+    sed -i '' -e "1s/^/## $NEXT_VERSION (Unreleased)\n\n/" CHANGELOG.md
+  fi
+}
+
+function main {
+  case "$1" in
+    prepare)
+      prepare "${@:2}"
+
+      ;;
+    cleanup)
+      cleanup "${@:2}"
+
+      ;;
+    *)
+      usage
+      exit 1
+
+      ;;
+  esac
+}
+
+main "$@"
+exit $?

scripts/version-bump.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: BUSL-1.1
+
+
+set -uo pipefail
+
+function usage {
+  cat <<-'EOF'
+Usage: ./version-bump.sh <version>
+
+Description:
+  This script will update the version/VERSION file with the given version.
+EOF
+}
+
+function update_version {
+  VERSION="${1:-}"
+
+  if [[ -z "$VERSION" ]]; then
+    echo "missing at least one of [<version>] arguments"
+    usage
+    exit 1
+  fi
+
+  echo "$VERSION" > version/VERSION
+}
+
+update_version "$@"
+exit $?