fleet: split-home-safe mosaic launcher (T110, P5-RM-009 stack side)
ci/woodpecker/pr/ci Pipeline was canceled
ci/woodpecker/pr/ci Pipeline was canceled
Ships fleet/bin/mosaic in the framework so the T106 shipped-first launcher contract survives split-home layouts. The shipped npm mosaic resolves from the passwd real home instead of $HOME: under a seat home (HOME=seat dir) the operator's npm prefix is still found, so 'HOME=<seat-home> fleet/bin/mosaic --version' returns the shipped version. The $HOME/.npm-global candidate is consulted only when the passwd lookup fails, and then every path component must be a non-symlink (secure descriptor traversal; a planted descriptor is refused without execution). T106 behavior preserved verbatim: worktree builds are MOSAIC_CLI_WORKTREE opt-in only, health-checked, shipped fallback on doubt; MOSAIC_FLEET_CLI_OFF forces pure pass-through; no runnable candidate exits 127 with the documented stderr line; stale worktree candidates never regain default precedence (without the opt-in env the worktree path is never read). Manifest: fleet/bin/** added to the [framework] section so the updater and installer both own the subtree (manifest-parity 17/17 green). Hermetic suite test-mosaic-launcher.sh covers the split-home positive, typed failure, stale-worktree non-precedence, opt-in healthy/unhealthy, OFF pass-through, and descriptor-refusal arms. Marker T110-DISPATCH-TOPHER-1N2O.
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topher
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#!/usr/bin/env bash
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# Hermetic suite for the fleet/bin/mosaic launcher (T110 / P5-RM-009).
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#
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# Arms cover the plan acceptance: split-home shipped-first positive, typed
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# failure on missing candidates, stale-worktree non-precedence, OFF
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# pass-through, and secure-descriptor refusal on the untrusted $HOME
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# fallback. No network, no real npm install, no node package build: the
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# "shipped mosaic" is a stub script and getent is PATH-stubbed (set
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# GETENT_STUB=fail to make the passwd lookup fail, exercising the guarded
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# $HOME fallback).
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set -euo pipefail
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SCRIPT_DIR=$(cd -- "$(dirname -- "$0")" && pwd)
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LAUNCHER="$SCRIPT_DIR/mosaic"
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fail() {
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echo "FAIL: $*" >&2
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exit 1
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}
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[ -f "$LAUNCHER" ] || fail "missing launcher"
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[ -x "$LAUNCHER" ] || fail "launcher is not executable"
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bash -n "$LAUNCHER" || fail "launcher fails bash -n"
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WORK=$(mktemp -d)
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cleanup() { rm -rf "$WORK"; }
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trap cleanup EXIT
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REAL_HOME="$WORK/real-home"
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SEAT_HOME="$WORK/seat-home"
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STUB_BIN="$WORK/stub-bin"
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mkdir -p "$REAL_HOME/.npm-global/bin" "$SEAT_HOME" "$STUB_BIN"
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cat >"$REAL_HOME/.npm-global/bin/mosaic" <<'SH'
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#!/bin/sh
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echo "0.0.0-shipped-stub"
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SH
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chmod +x "$REAL_HOME/.npm-global/bin/mosaic"
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# PATH-stubbed getent: reports the real home for the current uid, unless
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# GETENT_STUB=fail is in the launcher environment (exercises the guarded
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# $HOME fallback path).
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cat >"$STUB_BIN/getent" <<SH
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#!/bin/sh
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if [ "\${GETENT_STUB:-}" = "fail" ]; then exit 2; fi
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if [ "\$1" = "passwd" ]; then
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echo "stub:x:$(id -u):$(id -g):stub:$REAL_HOME:/bin/sh"
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exit 0
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fi
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exit 2
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SH
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chmod +x "$STUB_BIN/getent"
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run_launcher() { # run_launcher <home> [VAR=value ...] -- [args...]
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local home="$1"; shift
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[ "${1:-}" = "--" ] && shift
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env -i PATH="$STUB_BIN:/usr/bin:/bin" HOME="$home" TERM="${TERM:-dumb}" "$LAUNCHER" "$@"
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}
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# A1 — acceptance 1: split-home positive. HOME is an empty seat home; the
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# shipped mosaic resolves through the passwd real home.
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out="$(printf '' | run_launcher "$SEAT_HOME" -- --version)"
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[ "$out" = "0.0.0-shipped-stub" ] || fail "A1 split-home positive: got '$out', want shipped stub version"
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# A3 — acceptance 3: a stale worktree build is NEVER consulted without the
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# explicit opt-in, even when a worktree exists on disk.
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WT="$WORK/stale-wt"
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mkdir -p "$WT/packages/mosaic/dist"
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printf 'console.log("0.0.0-stale-worktree")\n' >"$WT/packages/mosaic/dist/cli.js"
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out="$(printf '' | run_launcher "$SEAT_HOME" -- --version)"
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[ "$out" = "0.0.0-shipped-stub" ] || fail "A3 stale worktree regained precedence without opt-in: got '$out'"
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# A2 (opt-in healthy) — explicit MOSAIC_CLI_WORKTREE reaches the worktree.
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out="$(printf '' | env MOSAIC_CLI_WORKTREE="$WT" HOME="$SEAT_HOME" PATH="$STUB_BIN:/usr/bin:/bin" "$LAUNCHER" --version)"
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[ "$out" = "0.0.0-stale-worktree" ] || fail "A2 opt-in worktree not used: got '$out'"
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# A2b (opt-in unhealthy) — absent dist falls back to shipped with a warning.
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out2="$(printf '' | env MOSAIC_CLI_WORKTREE="$WORK/empty-wt" HOME="$SEAT_HOME" PATH="$STUB_BIN:/usr/bin:/bin" "$LAUNCHER" --version 2>/dev/null)"
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[ "$out2" = "0.0.0-shipped-stub" ] || fail "A2b unhealthy worktree fallback output: '$out2'"
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err2="$(printf '' | env MOSAIC_CLI_WORKTREE="$WORK/empty-wt" HOME="$SEAT_HOME" PATH="$STUB_BIN:/usr/bin:/bin" "$LAUNCHER" --version 2>&1 >/dev/null)"
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case "$err2" in *"absent or unreadable"*|*"health check"*) ;; *) fail "A2b unhealthy worktree fallback warning missing: '$err2'" ;; esac
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# A4 — OFF pass-through: worktree opt-in is ignored when OFF is set.
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out="$(printf '' | env MOSAIC_FLEET_CLI_OFF=1 MOSAIC_CLI_WORKTREE="$WT" HOME="$SEAT_HOME" PATH="$STUB_BIN:/usr/bin:/bin" "$LAUNCHER" --version)"
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[ "$out" = "0.0.0-shipped-stub" ] || fail "A4 OFF did not force pass-through: got '$out'"
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# A5 — acceptance 4: typed failure when no candidate exists (passwd lookup
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# fails, seat home carries no npm prefix). Expect 127 + documented message.
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set +e
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err="$(printf '' | env GETENT_STUB=fail HOME="$SEAT_HOME" PATH="$STUB_BIN:/usr/bin:/bin" "$LAUNCHER" --version 2>&1 >/dev/null)"
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rc=$?
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set -e
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[ "$rc" = "127" ] || fail "A5 typed failure rc: got $rc, want 127"
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case "$err" in *"no runnable CLI"*) ;; *) fail "A5 typed failure message missing: '$err'" ;; esac
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# A6 — secure descriptor traversal: passwd lookup fails and a symlink-planted
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# $HOME/.npm-global is refused without execution.
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PLANT="$WORK/planted-target"
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mkdir -p "$PLANT/.npm-global/bin"
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cat >"$PLANT/.npm-global/bin/mosaic" <<SH
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#!/bin/sh
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touch "$WORK/planted-sentinel"
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echo "0.0.0-planted"
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SH
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chmod +x "$PLANT/.npm-global/bin/mosaic"
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ln -s "$PLANT" "$SEAT_HOME/.npm-global"
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set +e
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err="$(printf '' | env GETENT_STUB=fail HOME="$SEAT_HOME" PATH="$STUB_BIN:/usr/bin:/bin" "$LAUNCHER" --version 2>&1)"
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rc=$?
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set -e
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[ "$rc" = "127" ] || fail "A6 planted descriptor was followed (rc $rc, out '$err')"
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case "$err" in *"symlink component"*) ;; *) fail "A6 refusal diagnostic missing: '$err'" ;; esac
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[ ! -e "$WORK/planted-sentinel" ] || fail "A6 planted mosaic EXECUTED"
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echo "mosaic launcher suite: all arms passed"
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