fix(shell): remove test harness pipe hazards

packages/mosaic/framework/systemd/user/test-fleet-units.sh

@@ -145,7 +145,8 @@ EOF
   /usr/bin/env -i HOME="$HOLDER_HOME" PATH=/usr/bin:/bin \
     MOSAIC_TMUX_SOCKET="$TEST_SOCKET" MOSAIC_TMUX_HOLDER=_holder "$HOLDER_START"
   tmux -L "$TEST_SOCKET" has-session -t '=_holder:0.0' || fail "fresh holder was not created"
-  if tmux -L "$TEST_SOCKET" show-environment -g LD_PRELOAD 2>/dev/null | grep -q '^LD_PRELOAD='; then
+  ld_preload_env="$(tmux -L "$TEST_SOCKET" show-environment -g LD_PRELOAD 2>/dev/null)" || true
+  if grep -q '^LD_PRELOAD=' <<<"$ld_preload_env"; then
     fail "fresh holder retained LD_PRELOAD"
   fi
   /usr/bin/env -i HOME="$HOLDER_HOME" PATH=/usr/bin:/bin MOSAIC_HOME="$AGENT_HOME" \

packages/mosaic/framework/tools/git/test-issue-comment-readback.sh

@@ -280,7 +280,10 @@ print("201")
 print(json.dumps(record))
 PY
 )
-    write_response "$(printf '%s' "$result" | head -n1)" "$(printf '%s' "$result" | tail -n +2)"
+    response_status="${result%%$'\n'*}"
+    response_body=""
+    [[ "$result" == *$'\n'* ]] && response_body="${result#*$'\n'}"
+    write_response "$response_status" "$response_body"
 elif [[ "$method" == "GET" && "$path" == "$ISSUE_COMMENT_API_BASE"/issues/comments/* ]]; then
     result=$(ISSUE_COMMENT_GET_ID="${path##*/}" python3 - <<'PY'
 import json
@@ -299,7 +302,10 @@ else:
     print(json.dumps(match))
 PY
 )
-    write_response "$(printf '%s' "$result" | head -n1)" "$(printf '%s' "$result" | tail -n +2)"
+    response_status="${result%%$'\n'*}"
+    response_body=""
+    [[ "$result" == *$'\n'* ]] && response_body="${result#*$'\n'}"
+    write_response "$response_status" "$response_body"
 else
     echo "Unexpected curl request: $method $url" >&2
     exit 97

packages/mosaic/framework/tools/git/test-lane-brief-pr-linkage.sh

@@ -69,7 +69,7 @@ section_nums() { # $1 = output  $2 = header-prefix
 }
 
 fail() { echo "FAIL: $1" >&2; exit 1; }
-contains() { printf '%s\n' "$1" | grep -qx "$2"; }
+contains() { grep -qx "$2" <<<"$1"; }
 
 # ---------------------------------------------------------------------------
 # Fixed (current) script behavior

packages/mosaic/framework/tools/git/test-pr-review-gitea-comment.sh

@@ -225,7 +225,10 @@ write_response() {
 emit() {
     # Split a two-line "status\n<json body>" python result into the response.
     local result="$1"
-    write_response "$(printf '%s' "$result" | head -n1)" "$(printf '%s' "$result" | tail -n +2)"
+    response_status="${result%%$'\n'*}"
+    response_body=""
+    [[ "$result" == *$'\n'* ]] && response_body="${result#*$'\n'}"
+    write_response "$response_status" "$response_body"
 }
 
 mode="${PR_REVIEW_TEST_MODE:-}"

packages/mosaic/framework/tools/git/test-pr-review-repo-host-override.sh

@@ -222,8 +222,8 @@ grep -q 'Unknown action: bogus-action' "$OUTPUT_FILE"
 
 # --- Case 2: -h/--help documents both overrides.
 HELP_TEXT="$("$SCRIPT_DIR/pr-review.sh" -h)"
-echo "$HELP_TEXT" | grep -q -- '-r, --repo'
-echo "$HELP_TEXT" | grep -q -- '-H, --host'
+grep -q -- '-r, --repo' <<<"$HELP_TEXT"
+grep -q -- '-H, --host' <<<"$HELP_TEXT"
 
 # --- Case 3 (comment): a TRUE no-git-origin dir + -r/-H must not silently die
 # and must not fail with "not a git repository or no origin remote" either.

packages/mosaic/framework/tools/orchestrator/smoke-test.sh

@@ -64,12 +64,12 @@ if jq -e '.next_task == "T-001"' "$capsule_file" >/dev/null 2>&1; then pass_case
 if grep -Fq 'Target runtime:** codex' <<< "$codex_continue_output"; then pass_case "continue prompt contains target runtime codex"; else fail_case "continue prompt contains target runtime codex"; fi
 
 codex_run_prompt="$(MOSAIC_COORD_RUNTIME=codex bash "$SCRIPT_DIR/session-run.sh" --project "$tmp_project" --print)"
-if [[ "$(printf '%s\n' "$codex_run_prompt" | head -n1)" == "Now initiating Orchestrator mode..." ]]; then pass_case "codex run prompt first line is mode declaration"; else fail_case "codex run prompt first line is mode declaration"; fi
+if [[ "${codex_run_prompt%%$'\n'*}" == "Now initiating Orchestrator mode..." ]]; then pass_case "codex run prompt first line is mode declaration"; else fail_case "codex run prompt first line is mode declaration"; fi
 if grep -Fq 'Do NOT ask clarifying questions before your first tool actions' <<< "$codex_run_prompt"; then pass_case "codex run prompt includes no-questions hard gate"; else fail_case "codex run prompt includes no-questions hard gate"; fi
 if grep -Fq '"next_task": "T-001"' <<< "$codex_run_prompt"; then pass_case "codex run prompt embeds capsule json"; else fail_case "codex run prompt embeds capsule json"; fi
 
 claude_run_prompt="$(MOSAIC_COORD_RUNTIME=claude bash "$SCRIPT_DIR/session-run.sh" --project "$tmp_project" --print)"
-if [[ "$(printf '%s\n' "$claude_run_prompt" | head -n1)" == "## Continuation Mission" ]]; then pass_case "claude run prompt remains continuation prompt format"; else fail_case "claude run prompt remains continuation prompt format"; fi
+if [[ "${claude_run_prompt%%$'\n'*}" == "## Continuation Mission" ]]; then pass_case "claude run prompt remains continuation prompt format"; else fail_case "claude run prompt remains continuation prompt format"; fi
 
 echo ""
 echo "Smoke test summary: pass=$PASS fail=$FAIL"

packages/mosaic/framework/tools/orchestrator/test-board-roll.sh

@@ -96,8 +96,8 @@ L="$WORK/live5.md"; G="$WORK/ledger5.md"; echo "# LEDGER" > "$G"
 make_board "$L" 6 1 400
 before_l=$(cat "$L"); before_g=$(cat "$G")
 out=$(bash "$SUT" --live "$L" --ledger "$G" --cap 2000 --dry-run 2>&1) || note "dry-run exited nonzero: $out"
-echo "$out" | grep -qi "dry run" || note "dry-run did not announce itself"
-echo "$out" | grep -q "would roll" || note "dry-run did not report a plan"
+grep -qi "dry run" <<<"$out" || note "dry-run did not announce itself"
+grep -q "would roll" <<<"$out" || note "dry-run did not report a plan"
 [[ "$(cat "$L")" == "$before_l" ]] || note "dry-run modified LIVE"
 [[ "$(cat "$G")" == "$before_g" ]] || note "dry-run modified LEDGER"
 

packages/mosaic/framework/tools/quality/scripts/test-upgrade-durable-snapshot.sh

@@ -176,8 +176,12 @@ run_snap() {
 
 # Resolve the single pre-update-* snapshot dir under a state dir (newest if many).
 snap_dir() {
-  find "$1/mosaic/backups" -maxdepth 1 -type d -name 'pre-update-*' 2>/dev/null \
-    | LC_ALL=C sort -r | head -1
+  local -a snapshots=()
+  mapfile -t snapshots < <(
+    find "$1/mosaic/backups" -maxdepth 1 -type d -name 'pre-update-*' 2>/dev/null \
+      | LC_ALL=C sort -r
+  )
+  printf '%s\n' "${snapshots[0]:-}"
 }
 
 echo "── Part 1/2/3: durable snapshot scope, perms, no-leak ──────────────────"

packages/mosaic/framework/tools/quality/scripts/test-upgrade-rollback.sh

@@ -336,7 +336,7 @@ chk "[reset-fail] the manual-recovery pointer is emitted (not a silent set -e ex
   "grep -q 'Snapshot restore could not reset' '$OUTG'"
 chk "[reset-fail] the recovery message points at a preserved snapshot dir" \
   "grep -q 'preserved at: .*mosaic-snapshot' '$OUTG'"
-SNAP_E="$(grep -o '/[^ ]*mosaic-snapshot[^ ]*' "$OUTG" | head -1)"
+SNAP_E="$(grep -m1 -o '/[^ ]*mosaic-snapshot[^ ]*' "$OUTG")"
 chk "[reset-fail] the named snapshot directory actually survives for recovery" \
   "[ -n '$SNAP_E' ] && [ -d '$SNAP_E' ]"
 chk "[reset-fail] operator secret value never appears in installer output" \
@@ -353,7 +353,8 @@ chk "[control] without the D2 recovery line the operator gets no snapshot pointe
   "! grep -q 'Snapshot restore could not reset' '$OUTH'"
 [ -n "${SNAP_E:-}" ] && rm -rf "$SNAP_E"
 # Reap any snapshot the reset-fail runs left in /tmp (reset failed → never cleaned).
-grep -o '/[^ ]*mosaic-snapshot[^ ]*' "$OUTH" 2>/dev/null | head -1 | while read -r s; do rm -rf "$s"; done
+orphan_snapshot="$(grep -m1 -o '/[^ ]*mosaic-snapshot[^ ]*' "$OUTH" 2>/dev/null || true)"
+[ -n "$orphan_snapshot" ] && rm -rf "$orphan_snapshot"
 
 # Cleanup (generated installer controls are also removed by the EXIT trap).
 for d in "$HA" "$REFA" "$HB" "$REFB" "$HC" "$HD" "$HE" "$REFE" "$HF" "$REFF" "$HG" "$HH"; do rm -rf "$d"; done

packages/mosaic/framework/tools/tmux/test-send-message-socket.sh

@@ -34,16 +34,20 @@ tmux new-session -d -s "$DEFAULT_TARGET" -c "$TMPDIR" 'PS1="❯ " exec bash --no
 
 "$SEND_MESSAGE" -L "$SOCKET" -t "=$TARGET" -m "named socket hello" >/tmp/send-message-named.out
 sleep 0.2
-capture_named | grep -qF "named socket hello" || fail "send-message.sh did not deliver to named socket"
-if capture_default | grep -qF "named socket hello"; then
+named_pane="$(capture_named)" || fail "could not capture named socket pane"
+grep -qF "named socket hello" <<<"$named_pane" || fail "send-message.sh did not deliver to named socket"
+default_pane="$(capture_default)" || fail "could not capture default socket pane"
+if grep -qF "named socket hello" <<<"$default_pane"; then
   fail "send-message.sh leaked named-socket message to default tmux server"
 fi
 
 "$AGENT_SEND" -L "$SOCKET" -S "tester:source" -s "=$TARGET" -m "agent socket hello" >/tmp/agent-send-named.out
 sleep 0.2
-capture_named | grep -qF "[tester:source ->" || fail "agent-send.sh did not include preamble"
-capture_named | grep -qF "agent socket hello" || fail "agent-send.sh did not deliver to named socket"
-if capture_default | grep -qF "agent socket hello"; then
+named_pane="$(capture_named)" || fail "could not capture named socket pane"
+grep -qF "[tester:source ->" <<<"$named_pane" || fail "agent-send.sh did not include preamble"
+grep -qF "agent socket hello" <<<"$named_pane" || fail "agent-send.sh did not deliver to named socket"
+default_pane="$(capture_default)" || fail "could not capture default socket pane"
+if grep -qF "agent socket hello" <<<"$default_pane"; then
   fail "agent-send.sh leaked named-socket message to default tmux server"
 fi
 
@@ -65,11 +69,11 @@ done
 sleep 0.2
 for i in $(seq 1 "$CONC_N"); do
   pane=$(tmux -L "$SOCKET" capture-pane -t "=conc-$i:0.0" -p)
-  printf '%s' "$pane" | grep -qF "CONCPAYLOAD-${i}-END" \
+  grep -qF "CONCPAYLOAD-${i}-END" <<<"$pane" \
     || fail "concurrent send dropped payload for pane conc-$i"
   for j in $(seq 1 "$CONC_N"); do
     [ "$j" = "$i" ] && continue
-    if printf '%s' "$pane" | grep -qF "CONCPAYLOAD-${j}-END"; then
+    if grep -qF "CONCPAYLOAD-${j}-END" <<<"$pane"; then
       fail "concurrent send cross-delivered payload $j to pane conc-$i"
     fi
   done

packages/mosaic/framework/tools/tmux/test-send-message-verdict.sh

@@ -31,7 +31,7 @@ tmux -L "$SOCKET" new-session -d -s repl -c "$TMP" \
   'PS1="❯ " exec bash --noprofile --norc -i'
 sleep 0.3
 out=$("$SEND" -L "$SOCKET" -t "=repl" -m "verdict fixture one delivered ok" 2>"$TMP/e1"); rc=$?
-if [ "$rc" -eq 0 ] && printf '%s' "$out" | grep -qF "✓ delivered"; then
+if [ "$rc" -eq 0 ] && grep -qF "✓ delivered" <<<"$out"; then
   ok "delivered: ❯-prompt REPL that submits => exit 0 ✓ delivered"
 else
   no "delivered: ❯-prompt REPL that submits => exit 0 ✓ delivered" "rc=$rc out=[$out] err=[$(cat "$TMP/e1")]"