78 lines
2.3 KiB
Python
78 lines
2.3 KiB
Python
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"""Sync discovered mDNS hosts into the system hosts file.
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Writes a managed block so native tools (ping, curl, kubectl) resolve `.local`
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names without the `resolve` wrapper. Only IPv4, only the managed block is
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touched — the rest of the file is preserved.
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"""
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import os
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from pathlib import Path
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from . import browse as _browse
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from ._pick import pick_best
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MARK_BEGIN = "# >>> mdns-termux managed >>>"
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MARK_END = "# <<< mdns-termux managed <<<"
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def hosts_path() -> Path:
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prefix = os.environ.get("PREFIX", "")
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if prefix and "com.termux" in prefix:
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return Path(prefix) / "etc" / "hosts"
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return Path("/etc/hosts")
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def collect(duration: float = 3.0) -> dict[str, str]:
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"""Return {hostname.local: best_ipv4} from all advertised services."""
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out: dict[str, str] = {}
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for it in _browse.browse(None, duration):
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server = (it.get("server") or "").rstrip(".")
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v4 = [a for a in (it.get("addresses") or []) if ":" not in a]
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if not server or not v4:
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continue
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best = pick_best(v4, family="v4")
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if best and server not in out:
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out[server] = best
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return out
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def _render_block(mapping: dict[str, str]) -> str:
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lines = [MARK_BEGIN]
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for host in sorted(mapping):
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short = host[:-6] if host.endswith(".local") else host
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lines.append(f"{mapping[host]}\t{host} {short}")
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lines.append(MARK_END)
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return "\n".join(lines)
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def _strip_block(text: str) -> str:
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out, skip = [], False
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for line in text.splitlines():
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if line.strip() == MARK_BEGIN:
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skip = True
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continue
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if line.strip() == MARK_END:
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skip = False
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continue
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if not skip:
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out.append(line)
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return "\n".join(out).rstrip("\n")
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def sync(duration: float = 3.0, dry_run: bool = False) -> int:
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mapping = collect(duration)
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if not mapping:
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print("no hosts discovered on the LAN")
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return 1
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block = _render_block(mapping)
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if dry_run:
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print(block)
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return 0
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path = hosts_path()
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original = path.read_text() if path.exists() else "127.0.0.1\tlocalhost\n"
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body = _strip_block(original)
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path.write_text(f"{body}\n{block}\n")
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print(f"wrote {len(mapping)} host(s) to {path}")
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for host, ip in sorted(mapping.items()):
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print(f" {ip}\t{host}")
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return 0
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