82 lines
3.1 KiB
Bash
Executable File
82 lines
3.1 KiB
Bash
Executable File
#!/bin/bash
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#
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# Purpose : Run Hermes inside its sandbox (sandbox/agent runs this there) and
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# connect its terminal to its gateway.
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#
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# Hermes' gateway runs the agent; `hermes` in a terminal only talks to it, over
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# the gateway's control socket and then a WebSocket on 127.0.0.1:<port>. Each
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# sandbox has its own network, so that port can't be reached from another one.
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# The gateway's sandbox relays the port to API_SOCKET, and a terminal's sandbox
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# listens on the same port and relays to API_SOCKET, so `hermes` reaches the
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# gateway as if they shared a network.
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#
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# Usage: hermes-bridge <hermes command> [arguments]
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real="$1"
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shift
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HERMES_HOME="${HERMES_HOME:-$HOME/.hermes}"
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API_SOCKET="$HERMES_HOME/miniserver-api.sock"
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# The gateway's answer to `identify` on its control socket, or nothing if no
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# gateway is running
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identify() {
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local control="$HERMES_HOME/gateway.sock"
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[ -S "$control" ] || control="$(cat "$HERMES_HOME/gateway.sock.path" 2> /dev/null)"
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[ -S "$control" ] || return 1
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printf '{"protocol":1,"verb":"identify","id":1}\n' \
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| socat -t 5 - "UNIX-CONNECT:$control" 2> /dev/null | grep .
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}
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# The port the gateway's API listens on, once the gateway is ready. Only an
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# IPv4 loopback origin is relayed, which is what Hermes uses by default.
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api_port() {
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local origin
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origin="$(identify | jq -r 'select(.result.state == "ready") | .result.api_origin // empty' 2> /dev/null)"
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[[ "$origin" =~ ^http://127\.0\.0\.1:([0-9]+)$ ]] || return 1
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echo "${BASH_REMATCH[1]}"
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}
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if [ "$1" = "gateway" ] && [ "$2" = "run" ]; then
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# A terminal finds no relay, rather than the last gateway's, until this one
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# is up
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rm -f "$API_SOCKET"
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# The relay waits for the gateway, which runs in this process once exec'd;
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# the sandbox ends both together
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(
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for _ in $(seq 480); do
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if port="$(api_port)"; then
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exec socat "UNIX-LISTEN:$API_SOCKET,unlink-early,mode=600,fork" "TCP:127.0.0.1:$port"
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fi
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sleep 0.25
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done
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echo "hermes-bridge: the gateway's API didn't come up; terminals can't reach it" >&2
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) &
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exec "$real" "$@"
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fi
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# A terminal: relay the gateway's port, if a gateway is running or its service
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# is turned on, waiting for one that is still starting. Without one, hermes
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# starts its own gateway inside this sandbox, which needs no relay.
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if [ -e "$HOME/.config/systemd/user/default.target.wants/hermes-gateway.service" ] \
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|| identify > /dev/null; then
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[ -S "$API_SOCKET" ] && api_port > /dev/null || echo "Waiting for Hermes' gateway..." >&2
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for _ in $(seq 240); do
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[ -S "$API_SOCKET" ] && port="$(api_port)" && break
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port=""
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sleep 0.25
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done
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if [ -n "$port" ]; then
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socat "TCP-LISTEN:$port,bind=127.0.0.1,reuseaddr,fork" "UNIX-CONNECT:$API_SOCKET" &
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# Wait for the listener (state 0A, LISTEN, in /proc/net/tcp) so hermes'
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# first connection doesn't fail
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hex="$(printf ':%04X ' "$port")"
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for _ in $(seq 50); do
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grep -q "$hex.* 0A " /proc/net/tcp && break
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sleep 0.05
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done
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else
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echo "hermes-bridge: Hermes' gateway is running but its API isn't reachable; try: systemctl --user restart hermes-gateway" >&2
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fi
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fi
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exec "$real" "$@"
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