Rename File

rootfs/start.py

@@ -0,0 +1,219 @@
+#!/usr/local/bin/python
+
+import codecs
+import glob
+import os
+import subprocess
+import sys
+
+import jinja2
+
+
+# Utility functions
+def log(txt):
+    print(txt, file=sys.stderr)
+
+
+def error(txt):
+    log(txt)
+    sys.exit(2)
+
+
+def convert(src, dst, environ):
+    """Generate a file from a template
+
+    Args:
+        src (str): path to input file
+        dst (str): path to file to write
+        environ (dict): environment dictionary, for replacement mappings.
+    """
+    with open(src) as infile:
+        template = infile.read()
+    rendered = jinja2.Template(template).render(**environ)
+    with open(dst, "w") as outfile:
+        outfile.write(rendered)
+
+
+def generate_config_from_template(config_dir, config_path, environ):
+    """Generate a homeserver.yaml from environment variables
+
+    Args:
+        config_dir (str): where to put generated config files
+        config_path (str): where to put the main config file
+        environ (dict): environment dictionary
+    """
+    for v in ("SYNAPSE_SERVER_NAME", "SYNAPSE_REPORT_STATS"):
+        if v not in environ:
+            error(
+                "Environment variable '%s' is mandatory when generating a config file."
+                % (v,)
+            )
+
+    # populate some params from data files (if they exist, else create new ones)
+    environ = environ.copy()
+    secrets = {
+        "registration": "SYNAPSE_REGISTRATION_SHARED_SECRET",
+        "macaroon": "SYNAPSE_MACAROON_SECRET_KEY",
+    }
+
+    for name, secret in secrets.items():
+        if secret not in environ:
+            filename = "/data/%s.%s.key" % (environ["SYNAPSE_SERVER_NAME"], name)
+
+            # if the file already exists, load in the existing value; otherwise,
+            # generate a new secret and write it to a file
+
+            if os.path.exists(filename):
+                log("Reading %s from %s" % (secret, filename))
+                with open(filename) as handle:
+                    value = handle.read()
+            else:
+                log("Generating a random secret for {}".format(secret))
+                value = codecs.encode(os.urandom(32), "hex").decode()
+                with open(filename, "w") as handle:
+                    handle.write(value)
+            environ[secret] = value
+
+    environ["SYNAPSE_APPSERVICES"] = glob.glob("/data/appservices/*.yaml")
+    if not os.path.exists(config_dir):
+        os.mkdir(config_dir)
+
+    # Convert SYNAPSE_NO_TLS to boolean if exists
+    if "SYNAPSE_NO_TLS" in environ:
+        tlsanswerstring = str.lower(environ["SYNAPSE_NO_TLS"])
+        if tlsanswerstring in ("true", "on", "1", "yes"):
+            environ["SYNAPSE_NO_TLS"] = True
+        else:
+            if tlsanswerstring in ("false", "off", "0", "no"):
+                environ["SYNAPSE_NO_TLS"] = False
+            else:
+                error(
+                    'Environment variable "SYNAPSE_NO_TLS" found but value "'
+                    + tlsanswerstring
+                    + '" unrecognized; exiting.'
+                )
+
+    if "SYNAPSE_LOG_CONFIG" not in environ:
+        environ["SYNAPSE_LOG_CONFIG"] = config_dir + "/log.config"
+
+    log("Generating synapse config file " + config_path)
+    convert("/conf/homeserver.yaml", config_path, environ)
+
+    log_config_file = environ["SYNAPSE_LOG_CONFIG"]
+    log("Generating log config file " + log_config_file)
+    convert("/conf/log.config", log_config_file, environ)
+
+    # Hopefully we already have a signing key, but generate one if not.
+    args = [
+        "python",
+        "-m",
+        "synapse.app.homeserver",
+        "--config-path",
+        config_path,
+        # tell synapse to put generated keys in /data rather than /compiled
+        "--keys-directory",
+        config_dir,
+        "--generate-keys",
+    ]
+
+    subprocess.check_output(args)
+
+
+def run_generate_config(environ):
+    """Run synapse with a --generate-config param to generate a template config file
+
+    Args:
+        environ (dict): env var dict
+
+    Never returns.
+    """
+    for v in ("SYNAPSE_SERVER_NAME", "SYNAPSE_REPORT_STATS"):
+        if v not in environ:
+            error("Environment variable '%s' is mandatory in `generate` mode." % (v,))
+
+    server_name = environ["SYNAPSE_SERVER_NAME"]
+    config_dir = environ.get("SYNAPSE_CONFIG_DIR", "/data")
+    config_path = environ.get("SYNAPSE_CONFIG_PATH", config_dir + "/homeserver.yaml")
+    data_dir = environ.get("SYNAPSE_DATA_DIR", "/data")
+
+    # create a suitable log config from our template
+    log_config_file = "%s/%s.log.config" % (config_dir, server_name)
+    if not os.path.exists(log_config_file):
+        log("Creating log config %s" % (log_config_file,))
+        convert("/conf/log.config", log_config_file, environ)
+
+    args = [
+        "python",
+        "-m",
+        "synapse.app.homeserver",
+        "--server-name",
+        server_name,
+        "--report-stats",
+        environ["SYNAPSE_REPORT_STATS"],
+        "--config-path",
+        config_path,
+        "--config-directory",
+        config_dir,
+        "--data-directory",
+        data_dir,
+        "--generate-config",
+        "--open-private-ports",
+    ]
+    # log("running %s" % (args, ))
+
+    os.execv("/usr/local/bin/python", args)
+
+
+def main(args, environ):
+    mode = args[1] if len(args) > 1 else None
+    synapse_worker = environ.get("SYNAPSE_WORKER", "synapse.app.homeserver")
+
+    # In generate mode, generate a configuration and missing keys, then exit
+    if mode == "generate":
+        return run_generate_config(environ)
+
+    if mode == "migrate_config":
+        # generate a config based on environment vars.
+        config_dir = environ.get("SYNAPSE_CONFIG_DIR", "/data")
+        config_path = environ.get(
+            "SYNAPSE_CONFIG_PATH", config_dir + "/homeserver.yaml"
+        )
+        return generate_config_from_template(
+            config_dir, config_path, environ
+        )
+
+    if mode is not None:
+        error("Unknown execution mode '%s'" % (mode,))
+
+    config_dir = environ.get("SYNAPSE_CONFIG_DIR", "/data")
+    config_path = environ.get("SYNAPSE_CONFIG_PATH", config_dir + "/homeserver.yaml")
+
+    if not os.path.exists(config_path):
+        if "SYNAPSE_SERVER_NAME" in environ:
+            error(
+                """\
+Config file '%s' does not exist.
+
+The synapse docker image no longer supports generating a config file on-the-fly
+based on environment variables. You can migrate to a static config file by
+running with 'migrate_config'. See the README for more details.
+"""
+                % (config_path,)
+            )
+
+        error(
+            "Config file '%s' does not exist. You should either create a new "
+            "config file by running with the `generate` argument (and then edit "
+            "the resulting file before restarting) or specify the path to an "
+            "existing config file with the SYNAPSE_CONFIG_PATH variable."
+            % (config_path,)
+        )
+
+    log("Starting synapse with config file " + config_path)
+
+    args = ["python", "-m", synapse_worker, "--config-path", config_path]
+    os.execv("/usr/local/bin/python", args)
+
+
+if __name__ == "__main__":
+    main(sys.argv, os.environ)