38 lines
2.0 KiB
JavaScript
38 lines
2.0 KiB
JavaScript
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"use strict";
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const { buildBashHistoryCleanup, bashHistoryScratchNames } = require("./ptyExecHelpers.cjs");
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// Both fish and POSIX shells accept this command. Inspect the parent of a
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// short-lived sh in the interactive PTY, rather than the SSH login shell.
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function buildLiveShellProbe(marker) {
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const script = 'if test -r "/proc/$PPID/comm"; then IFS= read -r name < "/proc/$PPID/comm"; else name=$(ps -p "$PPID" -o comm= 2>/dev/null); fi; '
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+ `printf "${marker}_P:%s\\n" "$name"`;
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// command eval bypasses an eval customization; plain eval is the fallback
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// when command itself is shadowed. Never invoke a shadowed builtin after the
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// command path already succeeded. Both eval bodies remain Bash-guarded.
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const cleanup = buildBashHistoryCleanup(marker, true);
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const { dispatcher } = bashHistoryScratchNames(marker);
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const clear = `[ -z "\${${dispatcher}-}" ]||$${dispatcher} unset ${dispatcher}`;
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const fallback = `[ "\${${dispatcher}-}" = command ]||{ ${cleanup}; };${clear}`;
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// Continuation lines stay within canonical input limits. Each echo carries
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// the marker so the renderer also hides continuation prompts.
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return ` true ${marker}; command sh -c '${script}' 2>/dev/null; \\\n: '${marker}'; \\command eval '${cleanup}' 2>/dev/null || true; \\\n: '${marker}'; \\eval '${fallback}' 2>/dev/null || true; \\\n: '${marker}'; \\command eval '${clear}' 2>/dev/null || true; printf '%s' '${marker}_Q'\n`;
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}
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function parseLiveShellProbe(output, marker) {
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const lines = String(output).replace(/\r/g, "\n").split("\n");
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if (!lines.some((line) => line.startsWith(`${marker}_Q`))) return null;
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for (const line of lines) {
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if (!line.startsWith(`${marker}_P:`)) continue;
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const name = line.slice(marker.length + 3).trim().split("/").pop().replace(/^-/, "");
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return {
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kind: name === "fish" ? "fish"
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: /^(?:ba|da|z|k|a)?sh$/.test(name) ? "posix" : null,
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};
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}
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return { kind: null };
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}
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module.exports = { buildLiveShellProbe, parseLiveShellProbe };
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