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#!/usr/bin/env python3 | |
import os | |
import re | |
def parse_podman_service(service_content): | |
result = {"name": None, "ip": None} | |
if not re.search(r'^ExecStart=(/usr/bin/podman|podman)\s', service_content, re.MULTILINE): | |
return result | |
ip_match = re.search(r'--ip(\s+|=)(\d+\.\d+\.\d+\.\d+)', service_content) | |
name_match = re.search(r'(?:--name|-n)(\s+|=)([\w-]+)', service_content) | |
if ip_match: | |
result["ip"] = ip_match.group(2) | |
if name_match: | |
result["name"] = name_match.group(2) | |
return result | |
def update_hosts_section(hosts_path, section_name, entries): | |
section_start = f"# BEGIN {section_name}" | |
section_end = f"# END {section_name}" | |
new_section = [section_start] + [f"{ip} {name}" for ip, name in entries if ip and name] + [section_end] | |
try: | |
with open(hosts_path, 'r') as file: | |
lines = file.readlines() | |
if lines[-1][-1] != '\n': | |
lines.append('\n') | |
start_index = end_index = -1 | |
start_found = end_found = False | |
for i, line in enumerate(lines): | |
if line.strip() == section_start: | |
start_index = i | |
start_found = True | |
elif line.strip() == section_end: | |
end_index = i | |
if start_found: | |
end_found = True | |
if start_found and end_found: | |
break | |
if start_index != -1 and end_index != -1: | |
lines[start_index:end_index + 1] = [] | |
lines.extend([line + '\n' for line in new_section]) | |
with open(hosts_path, 'w') as file: | |
file.writelines(lines) | |
except IOError as e: | |
print(f"Error updating hosts file: {e}") | |
return False | |
return True | |
def scan_and_update_hosts(service_dir, hosts_path): | |
entries = [] | |
for filename in os.listdir(service_dir): | |
if filename.endswith('.service'): | |
fp = os.path.join(service_dir, filename) | |
if not os.path.exists(fp): | |
continue | |
with open(fp, 'r') as file: | |
service_content = file.read() | |
service_info = parse_podman_service(service_content) | |
if service_info['name'] and service_info['ip']: | |
entries.append((service_info['ip'], service_info['name'])) | |
entries.insert(0, ("10.88.0.1", "podman-host")) | |
return update_hosts_section(hosts_path, 'podman-service-hosts', entries) | |
if __name__ == '__main__': | |
# Example usage | |
service_dir = '/etc/systemd/system' # Replace with your service directory path | |
hosts_path = '/etc/hosts' # Replace with your hosts file path for testing | |
scan_and_update_hosts(service_dir, hosts_path) |
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