#!/usr/local/bin/python
import codecs
import glob
import os
import platform
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, ownership):
"""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
ownership (str|None): "<user>:<group>" string which will be used to set
ownership of the generated configs. If None, ownership will not change.
"""
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",
]
if ownership is not None:
log(f"Setting ownership on /data to {ownership}")
subprocess.check_output(["chown", "-R", ownership, "/data"])
args = ["gosu", ownership] + args
subprocess.check_output(args)
def run_generate_config(environ, ownership):
"""Run synapse with a --generate-config param to generate a template config file
Args:
environ (dict): env var dict
ownership (str|None): "userid:groupid" arg for chmod. If None, ownership will not change.
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")
if ownership is not None:
# make sure that synapse has perms to write to the data dir.
log(f"Setting ownership on {data_dir} to {ownership}")
subprocess.check_output(["chown", ownership, data_dir])
# 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)
# generate the main config file, and a signing key.
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 "run"
# if we were given an explicit user to switch to, do so
ownership = None
if "UID" in environ:
desired_uid = int(environ["UID"])
desired_gid = int(environ.get("GID", "991"))
ownership = f"{desired_uid}:{desired_gid}"
elif os.getuid() == 0:
# otherwise, if we are running as root, use user 991
ownership = "991:991"
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, ownership)
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, ownership
)
if mode != "run":
error("Unknown execution mode '%s'" % (mode,))
args = args[2:]
if "-m" not in args:
args = ["-m", synapse_worker] + args
jemallocpath = "/usr/lib/%s-linux-gnu/libjemalloc.so.2" % (platform.machine(),)
if os.path.isfile(jemallocpath):
environ["LD_PRELOAD"] = jemallocpath
else:
log("Could not find %s, will not use" % (jemallocpath,))
# if there are no config files passed to synapse, try adding the default file
if not any(p.startswith("--config-path") or p.startswith("-c") for p in args):
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,)
)
args += ["--config-path", config_path]
log("Starting synapse with args " + " ".join(args))
args = ["python"] + args
if ownership is not None:
args = ["gosu", ownership] + args
os.execve("/usr/sbin/gosu", args, environ)
else:
os.execve("/usr/local/bin/python", args, environ)
if __name__ == "__main__":
main(sys.argv, os.environ)