Add script and docs for updating glean_parser version

Author: brizental

bin/update-glean-parser-version.sh

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+#!/usr/bin/env bash
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Update the glean_parser version
+
+set -eo pipefail
+
+run() {
+    [ "${VERB:-0}" != 0 ] && echo "+ $*"
+    "$@"
+}
+
+# All sed commands below work with either
+# GNU sed (standard on Linux distrubtions) or BSD sed (standard on macOS)
+SED="sed"
+
+WORKSPACE_ROOT="$( cd "$(dirname "$0")/.." ; pwd -P )"
+
+if [ -z "$1" ]; then
+    echo "Usage: $(basename "$0") <new version>"
+    echo
+    echo "Update the glean_parser version"
+    exit 1
+fi
+
+NEW_VERSION="$1"
+
+# GIT_STATUS_OUTPUT=$(git status --untracked-files=no --porcelain)
+# if [ -z "$ALLOW_DIRTY" ] && [ -n "${GIT_STATUS_OUTPUT}" ]; then
+#     lines=$(echo "$GIT_STATUS_OUTPUT" | wc -l | tr -d '[:space:]')
+#     echo "error: ${lines} files in the working directory contain changes that were not yet committed into git:"
+#     echo
+#     echo "${GIT_STATUS_OUTPUT}"
+#     echo
+#     exit 1
+# fi
+
+# Update the version in glean/src/cli.ts
+FILE=glean/src/cli.ts
+run $SED -i.bak -E \
+    -e "s/const GLEAN_PARSER_VERSION = \"[0-9.]+\"/const GLEAN_PARSER_VERSION = \"${NEW_VERSION}\"/" \
+    "${WORKSPACE_ROOT}/${FILE}"
+run rm "${WORKSPACE_ROOT}/${FILE}.bak"
+
+# Update the version in samples/qt-qml-app/requirements.txt
+FILE=samples/qt-qml-app/requirements.txt
+run $SED -i.bak -E \
+    -e "s/glean_parser==[0-9.]+/glean_parser==${NEW_VERSION}/" \
+    "${WORKSPACE_ROOT}/${FILE}"
+run rm "${WORKSPACE_ROOT}/${FILE}.bak"
+
+echo "glean_parser updated to v${NEW_VERSION}"
+echo
+echo "Changed files:"
+git status --untracked-files=no --porcelain || true
+echo
+echo "Create update commit v${NEW_VERSION} now? [y/N]"
+read -r RESP
+echo
+if [ "$RESP" != "y" ] && [ "$RESP" != "Y" ]; then
+    echo "No new commit. No new tag. Proceed manually."
+    exit 0
+fi
+
+run git add --update "${WORKSPACE_ROOT}"
+run git commit --message "Bumped glean_parser version to ${NEW_VERSION}"
+
+if git remote | grep -q upstream; then
+    remote=upstream
+else
+    remote=origin
+fi
+branch=$(git rev-parse --abbrev-ref HEAD)
+
+echo "Don't forget to push this commit:"
+echo
+echo "    git push $remote $branch"
+

docs/update_glean_parser.md

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+# Updating the glean_parser version
+
+To update the version of glean_parser used by the Glean.js, run the `bin/update-glean-parser-version.sh` script, providing the version as a command line parameter:
+
+```bash
+bin/update-glean-parser-version.sh 1.28.3
+```
+
+This will update the version in all the required places and create a commit with the changes. After that you just need to create a pull request with the changes.
+
+No further action is required.