Add templates for systemd unit+socket

systemd/fjaweb.service.j2

+[Unit]
+Description=FJA web frontend
+
+[Service]
+Type=simple
+WorkingDirectory={{workdir | default("/var/lib/fjaweb")}}
+Environment=PYTHONPATH={{workdir | default("/var/lib/fjaweb")}}
+ExecStart={{uwsgi | default("/usr/bin/uwsgi")}} \
+            -s {{socket | default("/run/uwsgi/fjaweb.socket")}} \
+            --manage-script-name --plugin python3 \
+            --mount '/=evalweb:create_app()'
+User={{user | default("fjaweb")}}
+Group={{group | default("nginx")}}
+Restart=always
+RestartSec=2
+TimeoutStopSec=300
+
+{% if quota | default(True) %}
+CPUAccounting=true
+MemoryAccounting=true
+Nice=10
+# quota for one CPU
+CPUQuota={{quota_cpu | default("10%")}}
+MemoryHigh={{quota_mem_high | default("800M")}}
+MemoryMax={{quota_mem_max | default("1G")}}
+{% endif %}
+
+[Unit]
+StartLimitBurst=0
+StartLimitIntervalSec=0
+
+# vim: ft=systemd

systemd/fjaweb.socket.j2

+[Unit]
+Description=Socket for FJA web frontend
+
+[Socket]
+ListenStream={{socket | default("/run/uwsgi/fjaweb.socket")}}
+SocketUser={{user | default("fjaweb")}}
+SocketGroup={{group | default("nginx")}}
+SocketMode=0660
+
+[Install]
+WantedBy=sockets.target
+
+# vim: ft=systemd

systemd/install

+#!/usr/bin/env bash
+# vim: ft=bash
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+
+if [[ "$1" = "--help" ]]; then
+	echo -e "usage: $0 [--workdir WORKDIR]  [--uwsgi UWSGI_BINARY_PATH]\n" \
+	        "          [--user USENAME] [--group GROUPNAME]\n" \
+	        "          [--[no-]quota] [--quota-cpu CPU_QUOTA]\n" \
+	        "          [--quota-mem-high MEM_QUOTA] [--quota-mem-max MEM_QUOTA]\n"
+	exit 1
+fi
+for i in "socket" "service"; do
+	$DIR/../utils/render-template $DIR/fjaweb.$i.j2 /etc/systemd/system/fjaweb.$i "$@"
+done

utils/render-template

+#!/usr/bin/env python3
+
+import jinja2
+import sys
+from typing import Dict, Union
+
+
+def die(msg: str) -> None:
+    print("ERROR: ", msg, file=sys.stderr)
+    sys.exit(1)
+
+
+if __name__ == "__main__":
+    in_file = sys.argv[1]
+    out_file = sys.argv[2]
+    args: Dict[str, Union[str, bool]] = {}
+
+    i = 3
+    while i < len(sys.argv):
+        arg = sys.argv[i]
+        if not arg.startswith("--"):
+            die("argument {arg} does not start with --")
+        key = arg[2:]
+        if i != len(sys.argv) - 1 and not sys.argv[i + 1].startswith("--"):
+            args[key.replace("-", "_")] = sys.argv[i + 1]
+            i += 2
+        else:
+            bval = True
+            if key.startswith("no-"):
+                bval = False
+                key = key[3:]
+            args[key.replace("-", "_")] = bval
+            i += 1
+
+    template = jinja2.Template(open(in_file, "r").read())
+    out = open(out_file, "w")
+    out.write(template.render(**args))
+
+# vim: ft=python