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Cisco IOS collection: disable paging after prompt drain.

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Send terminal length 0 ourselves and wait for a full prompt line, so the
echo line cannot end the read and long show output no longer stalls on
--More--.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
oliver 2026-10-16 19:21:42 +08:00
parent 9085cac742
commit a36de061cd
2 changed files with 20 additions and 13 deletions
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14
netx_api/ne_session_connect.py
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@ -309,18 +309,20 @@ def _cisco_ios_collection_driver_class(base_cls: type) -> type:
class _CiscoIosCollectionSession(base_cls): # type: ignore[misc,valid-type]
def session_preparation(self) -> None:
# Stock Netmiko width/paging on IOSv+CR races leftover prompts
# (``terexit`` / ``terminal lengexit``) or blocks forever waiting for
# setup echo once VTY pressure builds. The interactive WebCRT path
# skips these commands and still returns complete show output; MCP
# show/display bodies are short enough that --More-- is not required.
# Keep hostname discovery so send_show_command can use a full-line
# prompt expect without auto_find_prompt.
# (``terexit`` / ``terminal lengexit``). Drain first, then disable
# paging ourselves and wait for a full prompt line: the echo line
# ``R2#terminal length 0`` cannot match, so long show output never
# stalls on --More--.
from .ne_netmiko import drain_read_channel
initial_pattern = r"(?m:^[^\r\n#>]+[>#][ \t]*$)"
self._test_channel_read(pattern=initial_pattern)
self.set_base_prompt(pattern=initial_pattern)
drain_read_channel(self, idle_reads=8, pause_sec=0.1)
self.write_channel("terminal length 0" + self.RETURN)
prompt_line = rf"(?m:^{re.escape(self.base_prompt)}[>#][ \t]*$)"
self.read_until_pattern(pattern=prompt_line, read_timeout=20)
drain_read_channel(self, idle_reads=8, pause_sec=0.1)
_CiscoIosCollectionSession.__name__ = (
f"CiscoIosCollection{getattr(base_cls, '__name__', 'Netmiko')}"