write_current_source_version.py

# This script produces SOURCE_VERSION file with content from current version commit hash. As a
# reminder,SOURCE_VERSION is required when building Envoy from an extracted release tarball
# (non-git). See: bazel/get_workspace_status for more information.
#
# The SOURCE_VERSION file is produced by reading current version tag from VERSION.txt file then
# fetch the corresponding commit hash from GitHub.
#
# Note: This script can only be executed from project root directory of an extracted "release"
# tarball.

import sys
import json

from urllib import request
from pathlib import Path

# Simple check if a .git directory exists. When we are in a Git repo, we should rely on git.
if Path(".git").exists():
    print(
        "Failed to create SOURCE_VERSION. "
        "Run this script from an extracted release tarball directory.")
    sys.exit(1)

# Check if we have VERSION.txt available
current_version_file = Path("VERSION.txt")
if not current_version_file.exists():
    print(
        "Failed to read VERSION.txt. "
        "Run this script from project root of an extracted release tarball directory.")
    sys.exit(1)

current_version = current_version_file.read_text().rstrip()

# Exit when we are in a "main" copy.
if current_version.endswith("-dev"):
    print(
        "Failed to create SOURCE_VERSION. "
        "The current VERSION.txt contains version with '-dev' suffix. "
        "Run this script from an extracted release tarball directory.")
    sys.exit(1)

# Fetch the current version commit information from GitHub.
with request.urlopen("https://api.github.com/repos/envoyproxy/envoy/commits/v"
                     + current_version) as response:
    commit_info = json.loads(response.read())
    source_version_file = Path("SOURCE_VERSION")
    with source_version_file.open("w", encoding="utf-8") as source_version:
        # Write the extracted current version commit hash "sha" to SOURCE_VERSION.
        source_version.write(commit_info["sha"])