9 files changed, 73 insertions, 40 deletions
diff --git a/changelog.d/6627.misc b/changelog.d/6627.misc
new file mode 100644
index 0000000000..702f067070
--- /dev/null
+++ b/changelog.d/6627.misc
@@ -0,0 +1 @@
+Automate generation of the sample log config.
diff --git a/debian/build_virtualenv b/debian/build_virtualenv
index 2791896052..d892fd5c9d 100755
--- a/debian/build_virtualenv
+++ b/debian/build_virtualenv
@@ -85,6 +85,9 @@ PYTHONPATH="$tmpdir" \
 
 ' > "${PACKAGE_BUILD_DIR}/etc/matrix-synapse/homeserver.yaml"
 
+# build the log config file
+"${TARGET_PYTHON}" -B "${VIRTUALENV_DIR}/bin/generate_log_config" \
+        --output-file="${PACKAGE_BUILD_DIR}/etc/matrix-synapse/log.yaml"
 
 # add a dependency on the right version of python to substvars.
 PYPKG=`basename $SNAKE`
diff --git a/debian/changelog b/debian/changelog
index 31791c127c..75fe89fa97 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+matrix-synapse-py3 (1.7.3ubuntu1) UNRELEASED; urgency=medium
+
+  * Automate generation of the default log configuration file.
+
+ -- Richard van der Hoff <richard@matrix.org>  Fri, 03 Jan 2020 13:55:38 +0000
+
 matrix-synapse-py3 (1.7.3) stable; urgency=medium
 
   * New synapse release 1.7.3.
diff --git a/debian/install b/debian/install
index 43dc8c6904..da8b726a2b 100644
--- a/debian/install
+++ b/debian/install
@@ -1,2 +1 @@
-debian/log.yaml etc/matrix-synapse
 debian/manage_debconf.pl /opt/venvs/matrix-synapse/lib/
diff --git a/debian/log.yaml b/debian/log.yaml
deleted file mode 100644
index 95b655dd35..0000000000
--- a/debian/log.yaml
+++ /dev/null
@@ -1,36 +0,0 @@
-
-version: 1
-
-formatters:
-  precise:
-   format: '%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - %(request)s- %(message)s'
-
-filters:
-  context:
-    (): synapse.logging.context.LoggingContextFilter
-    request: ""
-
-handlers:
-  file:
-    class: logging.handlers.RotatingFileHandler
-    formatter: precise
-    filename: /var/log/matrix-synapse/homeserver.log
-    maxBytes: 104857600
-    backupCount: 10
-    filters: [context]
-    encoding: utf8
-  console:
-    class: logging.StreamHandler
-    formatter: precise
-    level: WARN
-
-loggers:
-    synapse:
-        level: INFO
-
-    synapse.storage.SQL:
-        level: INFO
-
-root:
-    level: INFO
-    handlers: [file, console]
diff --git a/docs/sample_log_config.yaml b/docs/sample_log_config.yaml
index 11e8f35f41..1a2739455e 100644
--- a/docs/sample_log_config.yaml
+++ b/docs/sample_log_config.yaml
@@ -1,4 +1,4 @@
-# Example log config file for synapse.
+# Log configuration for Synapse.
 #
 # This is a YAML file containing a standard Python logging configuration
 # dictionary. See [1] for details on the valid settings.
@@ -20,7 +20,7 @@ handlers:
     file:
         class: logging.handlers.RotatingFileHandler
         formatter: precise
-        filename: /home/rav/work/synapse/homeserver.log
+        filename: /var/log/matrix-synapse/homeserver.log
         maxBytes: 104857600
         backupCount: 10
         filters: [context]
diff --git a/scripts-dev/generate_sample_config b/scripts-dev/generate_sample_config
index 5e33b9b549..9cb4630a5c 100755
--- a/scripts-dev/generate_sample_config
+++ b/scripts-dev/generate_sample_config
@@ -7,12 +7,22 @@ set -e
 cd `dirname $0`/..
 
 SAMPLE_CONFIG="docs/sample_config.yaml"
+SAMPLE_LOG_CONFIG="docs/sample_log_config.yaml"
+
+check() {
+    diff -u "$SAMPLE_LOG_CONFIG" <(./scripts/generate_log_config) >/dev/null || return 1
+}
 
 if [ "$1" == "--check" ]; then
     diff -u "$SAMPLE_CONFIG" <(./scripts/generate_config --header-file docs/.sample_config_header.yaml) >/dev/null || {
         echo -e "\e[1m\e[31m$SAMPLE_CONFIG is not up-to-date. Regenerate it with \`scripts-dev/generate_sample_config\`.\e[0m" >&2
         exit 1
     }
+    diff -u "$SAMPLE_LOG_CONFIG" <(./scripts/generate_log_config) >/dev/null || {
+        echo -e "\e[1m\e[31m$SAMPLE_LOG_CONFIG is not up-to-date. Regenerate it with \`scripts-dev/generate_sample_config\`.\e[0m" >&2
+        exit 1
+    }
 else
     ./scripts/generate_config --header-file docs/.sample_config_header.yaml -o "$SAMPLE_CONFIG"
+    ./scripts/generate_log_config -o "$SAMPLE_LOG_CONFIG"
 fi
diff --git a/scripts/generate_log_config b/scripts/generate_log_config
new file mode 100755
index 0000000000..b6957f48a3
--- /dev/null
+++ b/scripts/generate_log_config
@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+
+# -*- coding: utf-8 -*-
+# Copyright 2020 The Matrix.org Foundation C.I.C.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import argparse
+import sys
+
+from synapse.config.logger import DEFAULT_LOG_CONFIG
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+
+    parser.add_argument(
+        "-o",
+        "--output-file",
+        type=argparse.FileType("w"),
+        default=sys.stdout,
+        help="File to write the configuration to. Default: stdout",
+    )
+
+    parser.add_argument(
+        "-f",
+        "--log-file",
+        type=str,
+        default="/var/log/matrix-synapse/homeserver.log",
+        help="name of the log file",
+    )
+
+    args = parser.parse_args()
+    args.output_file.write(DEFAULT_LOG_CONFIG.substitute(log_file=args.log_file))
diff --git a/synapse/config/logger.py b/synapse/config/logger.py
index 3c455610d9..a25c70e928 100644
--- a/synapse/config/logger.py
+++ b/synapse/config/logger.py
@@ -40,7 +40,14 @@ from synapse.util.versionstring import get_version_string
 from ._base import Config, ConfigError
 
 DEFAULT_LOG_CONFIG = Template(
-    """
+    """\
+# Log configuration for Synapse.
+#
+# This is a YAML file containing a standard Python logging configuration
+# dictionary. See [1] for details on the valid settings.
+#
+# [1]: https://docs.python.org/3.7/library/logging.config.html#configuration-dictionary-schema
+
 version: 1
 
 formatters: