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systemd2rc.py
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systemd2rc.py
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import re
import argparse
def parse_ini_string(data):
regex = {
'section': re.compile(r'^\s*\[\s*([^\]]*)\s*\]\s*$'),
'param': re.compile(r'^\s*([^=]+?)\s*=\s*(.*?)\s*$'),
'comment': re.compile(r'^\s*;.*$')
}
value = {}
lines = data.split('\n')
section = None
for line in lines:
if regex['comment'].match(line):
continue
elif regex['param'].match(line):
match = regex['param'].match(line)
if section:
value.setdefault(section, {})[match.group(1)] = match.group(2)
else:
value[match.group(1)] = match.group(2)
elif regex['section'].match(line):
match = regex['section'].match(line)
value[match.group(1)] = {}
section = match.group(1)
elif not line.strip() and section:
section = None
return value
def parse_environment(raw):
parts = re.findall(r'\S+|"[^"]+"', raw)
result = {}
for part in parts:
key, value = part.split('=', 1)
result[key] = value.strip('"')
return result
def validate(parsed):
if 'Service' not in parsed:
return "No [Service] section found"
if 'EnvironmentFile' in parsed['Service']:
return "Environment= is not supported in openrc"
return None
def unit_to_rc(name):
table = {
"network.target": "net",
"remote-fs.target": "netmount",
"nss-lookup.target": "dns"
}
if name in table:
return table[name]
else:
return name.split('.')[0]
def units_to_rc(units):
names = units.split()
return ' '.join(unit_to_rc(name) for name in names)
def generate_depend(unit):
depend = ""
if 'After' in unit['Unit']:
depend += f"\tafter {units_to_rc(unit['Unit']['After'])}\n"
if 'Before' in unit['Unit']:
depend += f"\tbefore {units_to_rc(unit['Unit']['Before'])}\n"
if 'Requires' in unit['Unit']:
depend += f"\tneed {units_to_rc(unit['Unit']['Requires'])}\n"
if 'Wants' in unit['Unit']:
depend += f"\tuse {units_to_rc(unit['Unit']['Wants'])}\n"
if depend:
return f"\ndepend() {{\n{depend}}}\n"
return ""
def generate_supervise_args(unit):
result = ""
if 'WorkingDirectory' in unit['Service']:
result += f" -d {unit['Service']['WorkingDirectory']}"
if 'RootDirectory' in unit['Service']:
result += f" -r {unit['Service']['RootDirectory']}"
if 'UMask' in unit['Service']:
result += f" -k {unit['Service']['UMask']}"
if 'Nice' in unit['Service']:
result += f" -N {unit['Service']['Nice']}"
if 'IOSchedulingClass' in unit['Service']:
if 'IOSchedulingPriority' in unit['Service']:
result += f" -I {unit['Service']['IOSchedulingClass']}:{unit['Service']['IOSchedulingPriority']}"
else:
result += f" -I {unit['Service']['IOSchedulingClass']}"
if 'StandardOutput' in unit['Service']:
if unit['Service']['StandardOutput'].startswith('file:'):
result += f" -1 {unit['Service']['StandardOutput'][5:]}"
if 'StandardError' not in unit['Service']:
unit['Service']['StandardError'] = unit['Service']['StandardOutput']
if 'StandardError' in unit['Service']:
if unit['Service']['StandardError'].startswith('file:'):
result += f" -2 {unit['Service']['StandardError'][5:]}"
if 'Environment' in unit['Service']:
env = parse_environment(unit['Service']['Environment'])
for key, value in env.items():
result += f" -e {key}=\"{value}\""
if result:
return 'supervise_daemon_args="' + result.strip() + '"\n'
else:
return ''
def generate_ssd_args(unit):
result = ""
if 'WorkingDirectory' in unit['Service']:
result += f" -d {unit['Service']['WorkingDirectory']}"
if 'RootDirectory' in unit['Service']:
result += f" -r {unit['Service']['RootDirectory']}"
if 'UMask' in unit['Service']:
result += f" -k {unit['Service']['UMask']}"
if 'Nice' in unit['Service']:
result += f" -N {unit['Service']['Nice']}"
if 'IOSchedulingClass' in unit['Service']:
if 'IOSchedulingPriority' in unit['Service']:
result += f" -I {unit['Service']['IOSchedulingClass']}:{unit['Service']['IOSchedulingPriority']}"
else:
result += f" -I {unit['Service']['IOSchedulingClass']}"
if 'CPUSchedulingPolicy' in unit['Service']:
if 'CPUSchedulingPriority' in unit['Service']:
result += f" -I {unit['Service']['CPUSchedulingPolicy']}:{unit['Service']['CPUSchedulingPriority']}"
else:
result += f" -I {unit['Service']['CPUSchedulingPolicy']}"
if result:
return 'start_stop_daemon_args="' + result.strip() + '"\n'
else:
return ''
def generate_forking(unit):
cmd = unit['Service']['ExecStart']
pidfile = unit['Service']['PIDFile']
executable = cmd.split()[0]
args = ' '.join(cmd.split()[1:])
return f'''
command="{executable}"
command_args="{args}"
pidfile="{pidfile}"
'''
def generate_simple(unit):
cmd = unit['Service']['ExecStart']
executable = cmd.split()[0]
args = ' '.join(cmd.split()[1:]) if len(cmd.split()) > 1 else ""
return f'''
supervisor="supervise-daemon"
command="{executable}"
command_args="{args}"
'''
def generate_oneshot(unit):
cmd = unit['Service']['ExecStart']
executable = cmd.split()[0]
args = ' '.join(cmd.split()[1:])
return f'''
command="{executable}"
command_args="{args}"
'''
def generate_user(unit):
if 'User' in unit['Service']:
if 'Group' in unit['Service']:
return f'command_user="{unit["Service"]["User"]}:{unit["Service"]["Group"]}"\n'
else:
return f'command_user="{unit["Service"]["User"]}"\n'
return ""
def generate_stop(unit):
if 'ExecStop' not in unit['Service']:
return ""
return f'''
stop() {{
\tebegin "Stopping $RC_SVCNAME"
\t{unit["Service"]["ExecStop"]}
\teend $?
}}
'''
def generate_reload(unit):
if 'ExecReload' not in unit['Service']:
return ""
return f'''
reload() {{
\tebegin "Reloading $RC_SVCNAME"
\t{unit["Service"]["ExecReload"]}
\teend $?
}}
'''
def convert(raw_input):
parsed = parse_ini_string(raw_input)
validated = validate(parsed)
if validated:
return validated
result = f'''#!/sbin/openrc-run
name=$RC_SVCNAME
description="{parsed["Unit"]["Description"]}"
'''
service_type = parsed['Service'].get('Type', 'simple')
print(f"Generating {service_type} unit")
if service_type == 'simple' or service_type == 'exec':
result += generate_simple(parsed)
result += generate_supervise_args(parsed)
elif service_type == 'oneshot':
result += generate_oneshot(parsed)
result += generate_ssd_args(parsed)
elif service_type == 'forking':
result += generate_forking(parsed)
result += generate_ssd_args(parsed)
result += generate_user(parsed)
result += generate_depend(parsed)
result += generate_stop(parsed)
result += generate_reload(parsed)
return result
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="Convert a unit file to an OpenRC script")
parser.add_argument("input_file", help="Path to the unit file")
parser.add_argument("output_file", nargs="?", help="Path to the output OpenRC script (default: stdout)")
args = parser.parse_args()
try:
with open(args.input_file, "r") as f:
raw_input = f.read()
except FileNotFoundError:
print(f"Error: {args.input_file} not found.")
exit(1)
try:
result = convert(raw_input)
if args.output_file:
with open(args.output_file, "w") as f:
f.write(result)
else:
print(result)
except Exception as e:
print(f"Error: {e}")
exit(1)