host_bash

Testing & Quality

设备上跑只读 shell 命令做诊断探索（沙箱化 / read-only policy）

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I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/ongridio/ongrid/blob/HEAD/skills/bash/SKILL.md

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First, summarize what it does, its dependencies, license status if identifiable, and any risks. Show the exact files you propose to add under .agents/skills/host-bash/. Do not write files or run scripts until I approve.

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[能力: host_bash]

本工具在目标设备上运行单条 shell 命令或 pipe 管道，由边端 internal/edgeagent/cmdpolicy 沙箱做策略校验。v1 是 read-only policy，写操作一律被拒。

调用规则

host_bash(device_id=<num>, cmd="<command>")

device_id 必填：与 @-mention chip 和 Prom device_id label 一致
cmd 必填：单条命令或单层 pipe；不支持 ; && || $() <() > >> 反引号 / heredoc
timeout_seconds 可选：默认 30s，最大 300s

允许的命令分类

分类	示例 binary	备注
文件系统读	ls / cat / head / tail / find / du / stat / grep / awk / sed / wc	sed -i / find -delete / awk system() 拒
系统状态读	ps / df / free / uptime / iostat / vmstat / lsof / ss / netstat / dmesg / journalctl	journalctl --rotate / --vacuum-* 拒
网络配置读	iptables -L / ip addr / tc qdisc show / mount -l / crontab -l	iptables -A / ip addr add / mount /a /b 拒
OVS 探测	ovs-vsctl show / list-br / get / find / list；ovs-ofctl dump-flows / dump-ports / show；ovs-dpctl show；ovs-appctl fdb/show / lacp/show 等	add-br / del-br / set / add-flow / del-flows 全拒
nftables / conntrack	nft list ruleset / list table；conntrack -L / -S / -G / -E；ipset list；ethtool -i <iface>	nft add/delete/flush；conntrack -F / -D；ethtool -K/-G/-s 全拒
eBPF 只读	bpftool prog show / map dump / btf dump / net show / link show / iter list / feature probe	bpftool prog load / attach；map create / update 全拒（要写 BPF 走 Layer-3 preset）
网络命名空间	ip netns list / identify / pids；ip netns（裸= list）	ip netns exec / add / del 拒（exec 会重入沙箱）。深入 inspect 走 host_netns_inspect skill（未上）
服务状态读	systemctl status / cat / list-units / is-active	systemctl restart / stop / start 拒（用 host_restart_service）
网络探测	nc -z / curl --head / dig / host / ping / traceroute	curl -o / wget / nc -e/-l 拒；目标 host 须在 operator allowlist 内

不要做的事

不要尝试 redirect 写文件（> /tmp/x）—— 沙箱拒
不要尝试用 bash -c 套子壳 —— bash / sh / zsh / dash 整个 ClassDenied
不要尝试 sed -i —— 用 sed 看就行，改文件不在本工具职责
不要尝试 systemctl restart —— 用 host_restart_service skill（带 reviewer 二审）
被拒后不要重试同一条命令 —— 读 response.reason，调整命令再发
不要用本工具替代结构化查询 —— 简单 cpu/mem/进程查询用 get_host_load / get_host_processes

v1 实现说明

Policy = cmdpolicy.DefaultReadOnly()，operator 可在 /etc/ongrid-edge/bash-policy.yaml 扩展或收紧（替换某个 binary 的 matchers / 缩短 path allowlist / 改 timeout / 加 network allowlist）
网络出站默认全拒（network_host_allowlist=[]），operator 显式添加 CIDR 或 hostname suffix 才放行
Path allowlist 默认 /var /opt /home /tmp /srv /data（与 host_files 共享同一份）
stdout cap 64 KiB / stderr cap 16 KiB / 默认 timeout 30s / 单段 argv ≤32

How to use this skill

调用规则

允许的命令分类

推荐套路（诊断 / 探索）

不要做的事

v1 实现说明