test(tier): pin candidate package digest

.github/workflows/audit.yml

@@ -28,6 +28,7 @@ on:
       - 'scripts/test_package_versions.sh'
       - 'scripts/security/check_performance_ab_workflow.sh'
       - 'scripts/security/check_preview_release_workflow.sh'
+      - 'scripts/security/check_tier_artifact_workflow.sh'
       - 'scripts/security/check_workflow_pins.sh'
   pull_request:
     types: [ opened, synchronize, reopened, closed ]
@@ -43,6 +44,7 @@ on:
       - 'scripts/test_package_versions.sh'
       - 'scripts/security/check_performance_ab_workflow.sh'
       - 'scripts/security/check_preview_release_workflow.sh'
+      - 'scripts/security/check_tier_artifact_workflow.sh'
       - 'scripts/security/check_workflow_pins.sh'
   schedule:
     # Daily, not weekly. This schedule exists to catch RustSec advisories
@@ -150,6 +152,9 @@ jobs:
       - name: Check performance A/B workflow trust boundary
         run: ./scripts/security/check_performance_ab_workflow.sh
 
+      - name: Check tier evidence workflow isolation
+        run: ./scripts/security/check_tier_artifact_workflow.sh
+
       - name: Check package version contract
         run: ./scripts/test_package_versions.sh
 

.github/workflows/rustfs-tier-test.yml

@@ -11,6 +11,10 @@ on:
         description: 'Direct .deb URL (nightly/R2/dev). Overrides rustfs_version.'
         required: false
         type: string
+      package_sha256:
+        description: 'Optional SHA-256 for package_url; mismatch is an infrastructure failure.'
+        required: false
+        type: string
       rc_sha256:
         description: 'Optional SHA-256 for the preinstalled rc binary; mismatch is an infrastructure failure.'
         required: false
@@ -54,18 +58,37 @@ jobs:
     timeout-minutes: 420
     if: ${{ github.event_name == 'workflow_dispatch' || github.event_name == 'repository_dispatch' }}
     steps:
+      - name: Initialize run evidence directory
+        id: evidence
+        run: |
+          set -euo pipefail
+          umask 077
+          if ! mkdir -- "${TIER_ARTIFACTS_DIR}"; then
+            echo "refusing to reuse tier evidence path: ${TIER_ARTIFACTS_DIR}" >&2
+            exit 1
+          fi
+          test -d "${TIER_ARTIFACTS_DIR}"
+          test ! -L "${TIER_ARTIFACTS_DIR}"
+
       # auto-testing is private: clone it with the dedicated PF token (not
       # GITHUB_TOKEN) and retry transient GitHub/network failures.
       - name: Checkout auto-testing scripts (with retry)
         env:
           GH_TOKEN: ${{ secrets.PF_TESTING_GH_TOKEN }}
+          AUTO_TESTING_REF: cxymds/fix-2132-tier-log-isolation
+          AUTO_TESTING_COMMIT: 02da54dd62110649dc2860fc5fcd9e08d2e9a1ca
         run: |
           set -euo pipefail
           rm -rf auto-testing
           for attempt in 1 2 3 4 5; do
-            if gh repo clone rustfs/auto-testing auto-testing -- --depth 1 --quiet; then
-              echo "auto-testing cloned (attempt ${attempt})"
-              exit 0
+            if gh repo clone rustfs/auto-testing auto-testing -- \
+              --branch "${AUTO_TESTING_REF}" --single-branch --depth 1 --quiet; then
+              actual_commit="$(git -C auto-testing rev-parse HEAD)"
+              if [[ "${actual_commit}" == "${AUTO_TESTING_COMMIT}" ]]; then
+                echo "auto-testing ${actual_commit} cloned (attempt ${attempt})"
+                exit 0
+              fi
+              echo "auto-testing commit mismatch: expected ${AUTO_TESTING_COMMIT}, got ${actual_commit}" >&2
             fi
             rm -rf auto-testing
             echo "clone attempt ${attempt} failed; retrying in $((attempt * 15))s" >&2
@@ -74,6 +97,39 @@ jobs:
           echo "ERROR: unable to clone rustfs/auto-testing after 5 attempts" >&2
           exit 1
 
+      - name: Download exact rc candidate
+        uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7
+        with:
+          repository: rustfs/rustfs-release-validation
+          run-id: '33465191972'
+          name: rc-under-test-33465191972-1
+          path: ${{ runner.temp }}/issue-2128-rc
+          github-token: ${{ secrets.PF_TESTING_GH_TOKEN }}
+
+      - name: Verify exact rc candidate
+        env:
+          RC_BIN: ${{ runner.temp }}/issue-2128-rc/rc
+          RC_PROVENANCE: ${{ runner.temp }}/issue-2128-rc/rc-build.json
+          RC_EXPECTED_COMMIT: f6b9b509a60ef172a2b037d638c2cac46e762129
+          RC_EXPECTED_SHA256: 3d128d99f05403f4028c7c9ae24b03d66a3e98f2090e66cb7f9f45a9e11fdce1
+        run: |
+          set -euo pipefail
+          test -s "${RC_BIN}"
+          test -s "${RC_PROVENANCE}"
+          jq -e \
+            --arg commit "${RC_EXPECTED_COMMIT}" \
+            --arg digest "${RC_EXPECTED_SHA256}" \
+            '.repository == "rustfs/cli"
+             and .requestedCommit == $commit
+             and .resolvedCommit == $commit
+             and .binarySha256 == $digest
+             and .target == "x86_64-unknown-linux-gnu"' \
+            "${RC_PROVENANCE}" >/dev/null
+          actual_sha256="$(sha256sum -- "${RC_BIN}" | awk '{print $1}')"
+          test "${actual_sha256}" = "${RC_EXPECTED_SHA256}"
+          chmod 0555 "${RC_BIN}"
+          "${RC_BIN}" --version
+
       - name: Show environment
         run: |
           uname -a
@@ -133,14 +189,16 @@ jobs:
         id: test
         continue-on-error: true
         env:
-          LOG_FILE: /tmp/rustfs-tier.log
           PACKAGE_URL_INPUT: ${{ inputs.package_url }}
+          PACKAGE_SHA256_INPUT: ${{ inputs.package_sha256 }}
           RUSTFS_VERSION_INPUT: ${{ inputs.rustfs_version }}
         run: |
           set -euo pipefail
+          LOG_FILE="${TIER_ARTIFACTS_DIR}/rustfs-tier.log"
           chmod +x auto-testing/rustfs-tier-test.sh
-          RC_BIN="$(command -v rc)"
+          RC_BIN="${RUNNER_TEMP}/issue-2128-rc/rc"
           PACKAGE_URL="${PACKAGE_URL_INPUT}"
+          PACKAGE_SHA256="${PACKAGE_SHA256_INPUT}"
           RUSTFS_VERSION="${RUSTFS_VERSION_INPUT}"
           ARGS=(
             --all-topologies
@@ -152,6 +210,9 @@ jobs:
           if [ -n "${RUSTFS_EXPECTED_RC_SHA256}" ]; then
             ARGS+=(--expected-rc-sha256 "${RUSTFS_EXPECTED_RC_SHA256}")
           fi
+          if [ -n "${PACKAGE_SHA256}" ]; then
+            ARGS+=(--sha256 "${PACKAGE_SHA256}")
+          fi
           if [ -n "${PACKAGE_URL}" ]; then
             ARGS+=(--package-url "${PACKAGE_URL}")
           elif [ -n "${RUSTFS_VERSION}" ]; then
@@ -162,7 +223,7 @@ jobs:
           ./auto-testing/rustfs-tier-test.sh "${ARGS[@]}"
 
       - name: Inject diagnostic case failure
-        if: ${{ always() && inputs.force_case_failure }}
+        if: ${{ always() && steps.evidence.outcome == 'success' && inputs.force_case_failure }}
         run: |
           set -euo pipefail
           RESULT_FILE="${TIER_ARTIFACTS_DIR}/cases/single-single--TIER-101.json"
@@ -172,12 +233,8 @@ jobs:
           mv "${TMP_FILE}" "${RESULT_FILE}"
 
       - name: Generate report
-        if: always()
+        if: ${{ always() && steps.evidence.outcome == 'success' }}
         env:
-          LOG_FILE: /tmp/rustfs-tier.log
-          REPORT_FILE: /tmp/rustfs-tier-report.md
-          CASE_TABLE: /tmp/rustfs-tier-cases.md
-          GATE_RC_FILE: /tmp/rustfs-tier-gate.rc
           PACKAGE_URL_INPUT: ${{ inputs.package_url }}
           RUSTFS_VERSION_INPUT: ${{ inputs.rustfs_version }}
           TEST_OUTCOME: ${{ steps.test.outcome }}
@@ -185,6 +242,12 @@ jobs:
           TRIGGER_NAME: ${{ github.event_name }}
         run: |
           set -euo pipefail
+          test -d "${TIER_ARTIFACTS_DIR}"
+          test ! -L "${TIER_ARTIFACTS_DIR}"
+          LOG_FILE="${TIER_ARTIFACTS_DIR}/rustfs-tier.log"
+          REPORT_FILE="${TIER_ARTIFACTS_DIR}/rustfs-tier-report.md"
+          CASE_TABLE="${TIER_ARTIFACTS_DIR}/rustfs-tier-cases.md"
+          GATE_RC_FILE="${TIER_ARTIFACTS_DIR}/rustfs-tier-gate.rc"
           PACKAGE_URL="${PACKAGE_URL_INPUT}"
           RUSTFS_VERSION="${RUSTFS_VERSION_INPUT}"
           if [ -n "${PACKAGE_URL}" ]; then
@@ -228,11 +291,11 @@ jobs:
           cat "${REPORT_FILE}" >> "${GITHUB_STEP_SUMMARY}"
 
       - name: Upload functional report to dashboard
-        if: always()
+        if: ${{ always() && steps.evidence.outcome == 'success' }}
         continue-on-error: true
         env:
           GH_TOKEN: ${{ env.PF_TESTING_GH_TOKEN }}
-          REPORT_FILE: /tmp/rustfs-tier-report.md
+          REPORT_FILE: ${{ env.TIER_ARTIFACTS_DIR }}/rustfs-tier-report.md
           SUITE: tier
         run: |
           set -euo pipefail
@@ -254,16 +317,110 @@ jobs:
               | gh api --method PUT "repos/rustfs/dashboard/contents/${REPORT_PATH}" --input - >/dev/null
           fi
 
+      - name: Verify required tier evidence
+        id: evidence_verify
+        if: ${{ always() && steps.evidence.outcome == 'success' }}
+        run: |
+          set -euo pipefail
+          failed=0
+          for name in \
+            rustfs-tier.log \
+            rustfs-tier-report.md \
+            rustfs-tier-cases.md \
+            rustfs-tier-gate.rc \
+            provenance.json; do
+            if [ ! -s "${TIER_ARTIFACTS_DIR}/${name}" ]; then
+              echo "required tier evidence is missing or empty: ${name}" >&2
+              failed=1
+            fi
+          done
+          for name in cases logs; do
+            if [ ! -d "${TIER_ARTIFACTS_DIR}/${name}" ]; then
+              echo "required tier evidence directory is missing: ${name}" >&2
+              failed=1
+            fi
+          done
+          if ! find "${TIER_ARTIFACTS_DIR}/cases" -maxdepth 1 -type f -name '*.json' -print -quit 2>/dev/null | grep -q .; then
+            echo "no atomic tier case result was produced" >&2
+            failed=1
+          fi
+          [ "${failed}" -eq 0 ]
+
+      - name: Upload report and logs
+        if: ${{ always() && steps.evidence.outcome == 'success' }}
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
+        with:
+          name: rustfs-tier-test-${{ github.run_id }}-${{ github.run_attempt }}
+          path: ${{ env.TIER_ARTIFACTS_DIR }}/
+          if-no-files-found: error
+
+      - name: Cleanup environment (after)
+        if: always()
+        run: |
+          set -euo pipefail
+          sudo docker rm -f rustfs-test-mqtt >/dev/null 2>&1 || true
+          sudo rm -f /tmp/rustfs-mosquitto.conf
+          read -r -a NODES <<< "${RUSTFS_NODES:-vm000 vm001 vm002}"
+          SSH_USER="${RUSTFS_SSH_USER:-azureuser}"
+          for node in "${NODES[@]}"; do
+            ssh -o BatchMode=yes -o ConnectTimeout=10 -o StrictHostKeyChecking=accept-new "${SSH_USER}@${node}" '
+              set -euo pipefail
+              SUDO=""; [ "$(id -u)" -ne 0 ] && SUDO="sudo -n"
+              ${SUDO} systemctl stop rustfs 2>/dev/null || true
+              if ${SUDO} dpkg -l rustfs 2>/dev/null | grep -q "^ii"; then
+                ${SUDO} dpkg -P rustfs
+              fi
+              for i in 1 2 3 4; do ${SUDO} rm -rf /data/rustfs${i}/mnmd; done
+              ${SUDO} rm -rf /var/log/rustfs /var/lib/rustfs/kms
+            '
+          done
+
+      - name: Enforce tier suite result
+        id: gate
+        if: always()
+        env:
+          EVIDENCE_OUTCOME: ${{ steps.evidence.outcome }}
+          TEST_OUTCOME: ${{ steps.test.outcome }}
+          GATE_RC_FILE: ${{ env.TIER_ARTIFACTS_DIR }}/rustfs-tier-gate.rc
+        run: |
+          set -euo pipefail
+          failed=0
+          if [ "${EVIDENCE_OUTCOME}" != "success" ]; then
+            echo "tier evidence directory initialization is ${EVIDENCE_OUTCOME}, expected success" >&2
+            failed=1
+          fi
+          if [ "${TEST_OUTCOME}" != "success" ]; then
+            echo "tier suite step outcome is ${TEST_OUTCOME}, expected success" >&2
+            failed=1
+          fi
+          if [ "${EVIDENCE_OUTCOME}" != "success" ]; then
+            echo "structured gate result is unavailable because evidence initialization failed" >&2
+          elif [ ! -s "${GATE_RC_FILE}" ]; then
+            echo "structured gate result is missing" >&2
+            failed=1
+          else
+            GATE_RC="$(tr -d '[:space:]' < "${GATE_RC_FILE}")"
+            if ! [[ "${GATE_RC}" =~ ^[0-9]+$ ]] || [ "${GATE_RC}" -ne 0 ]; then
+              echo "structured 56-case gate failed with exit ${GATE_RC:-invalid}" >&2
+              failed=1
+            fi
+          fi
+          [ "${failed}" -eq 0 ]
+
       - name: File failure issue in rustfs/backlog
-        if: ${{ always() && (failure() || steps.test.outcome == 'failure' || steps.test.outcome == 'cancelled') }}
+        if: ${{ always() && (failure() || steps.test.outcome == 'failure' || steps.test.outcome == 'cancelled' || steps.evidence_verify.outcome == 'failure' || steps.evidence_verify.outcome == 'cancelled' || steps.gate.outcome == 'failure' || steps.gate.outcome == 'cancelled') }}
         continue-on-error: true
         env:
           GH_TOKEN: ${{ secrets.PF_TESTING_GH_TOKEN }}
           SUITE: 'tier'
           SUITE_LABEL: 'Tier'
           RUN_URL: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}
-          REPORT_FILE: '/tmp/rustfs-tier-report.md'
-          LOG_FILE: '/tmp/rustfs-tier.log'
+          EVIDENCE_DIR: ${{ env.TIER_ARTIFACTS_DIR }}
+          EVIDENCE_OUTCOME: ${{ steps.evidence.outcome }}
+          VERIFY_OUTCOME: ${{ steps.evidence_verify.outcome }}
+          GATE_OUTCOME: ${{ steps.gate.outcome }}
+          REPORT_FILE: ${{ env.TIER_ARTIFACTS_DIR }}/rustfs-tier-report.md
+          LOG_FILE: ${{ env.TIER_ARTIFACTS_DIR }}/rustfs-tier.log
         run: |
           set -euo pipefail
           if [ -z "${GH_TOKEN:-}" ]; then
@@ -293,10 +450,17 @@ jobs:
             echo "- Run: ${RUN_URL}"
             echo "- Trigger: ${GITHUB_EVENT_NAME}"
             echo "- Date: $(date -u +%Y-%m-%d)"
+            echo "- Evidence initialization: ${EVIDENCE_OUTCOME}"
+            echo "- Evidence verification: ${VERIFY_OUTCOME}"
+            echo "- Final gate: ${GATE_OUTCOME}"
             echo ""
             echo "## Report (errors and symptoms)"
             echo ""
-            if [ -s "${REPORT_FILE}" ]; then
+            if [ "${EVIDENCE_OUTCOME}" != "success" ]; then
+              echo "(the run evidence directory was rejected; its contents were not read)"
+            elif [ ! -d "${EVIDENCE_DIR}" ] || [ -L "${EVIDENCE_DIR}" ]; then
+              echo "(the run evidence directory is missing or unsafe; its contents were not read)"
+            elif [ -s "${REPORT_FILE}" ]; then
               redact < "${REPORT_FILE}"
             elif [ -s "${LOG_FILE:-}" ]; then
               echo "(report file missing; log tail below)"
@@ -313,64 +477,6 @@ jobs:
           fi
           echo "filed backlog issue for suite ${SUITE}"
 
-      - name: Upload report and logs
-        if: always()
-        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
-        with:
-          name: rustfs-tier-test-${{ github.run_id }}-${{ github.run_attempt }}
-          path: |
-            /tmp/rustfs-tier.log
-            /tmp/rustfs-tier-report.md
-            /tmp/rustfs-tier-cases.md
-            /tmp/rustfs-tier-gate.rc
-            ${{ env.TIER_ARTIFACTS_DIR }}/
-          if-no-files-found: error
-
-      - name: Cleanup environment (after)
-        if: always()
-        run: |
-          set -euo pipefail
-          sudo docker rm -f rustfs-test-mqtt >/dev/null 2>&1 || true
-          sudo rm -f /tmp/rustfs-mosquitto.conf
-          read -r -a NODES <<< "${RUSTFS_NODES:-vm000 vm001 vm002}"
-          SSH_USER="${RUSTFS_SSH_USER:-azureuser}"
-          for node in "${NODES[@]}"; do
-            ssh -o BatchMode=yes -o ConnectTimeout=10 -o StrictHostKeyChecking=accept-new "${SSH_USER}@${node}" '
-              set -euo pipefail
-              SUDO=""; [ "$(id -u)" -ne 0 ] && SUDO="sudo -n"
-              ${SUDO} systemctl stop rustfs 2>/dev/null || true
-              if ${SUDO} dpkg -l rustfs 2>/dev/null | grep -q "^ii"; then
-                ${SUDO} dpkg -P rustfs
-              fi
-              for i in 1 2 3 4; do ${SUDO} rm -rf /data/rustfs${i}/mnmd; done
-              ${SUDO} rm -rf /var/log/rustfs /var/lib/rustfs/kms
-            '
-          done
-
-      - name: Enforce tier suite result
-        if: always()
-        env:
-          TEST_OUTCOME: ${{ steps.test.outcome }}
-          GATE_RC_FILE: /tmp/rustfs-tier-gate.rc
-        run: |
-          set -euo pipefail
-          failed=0
-          if [ "${TEST_OUTCOME}" != "success" ]; then
-            echo "tier suite step outcome is ${TEST_OUTCOME}, expected success" >&2
-            failed=1
-          fi
-          if [ ! -s "${GATE_RC_FILE}" ]; then
-            echo "structured gate result is missing" >&2
-            failed=1
-          else
-            GATE_RC="$(tr -d '[:space:]' < "${GATE_RC_FILE}")"
-            if ! [[ "${GATE_RC}" =~ ^[0-9]+$ ]] || [ "${GATE_RC}" -ne 0 ]; then
-              echo "structured 56-case gate failed with exit ${GATE_RC:-invalid}" >&2
-              failed=1
-            fi
-          fi
-          [ "${failed}" -eq 0 ]
-
       - name: "Continue functional chain (next: Storage engine)"
         # Only chain-triggered runs forward to the next suite; standalone
         # workflow_dispatch runs stop after their own cleanup.

scripts/security/check_tier_artifact_workflow.sh

@@ -0,0 +1,168 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+WORKFLOW="${1:-.github/workflows/rustfs-tier-test.yml}"
+
+fail() {
+  printf 'tier artifact workflow check failed: %s\n' "$*" >&2
+  exit 1
+}
+
+[ -f "${WORKFLOW}" ] || fail "workflow not found: ${WORKFLOW}"
+
+for fixed_path in \
+  /tmp/rustfs-tier.log \
+  /tmp/rustfs-tier-report.md \
+  /tmp/rustfs-tier-cases.md \
+  /tmp/rustfs-tier-gate.rc; do
+  if grep -Fq -- "${fixed_path}" "${WORKFLOW}"; then
+    fail "fixed cross-run path remains: ${fixed_path}"
+  fi
+done
+
+for required in \
+  'TIER_ARTIFACTS_DIR: /tmp/rustfs-tier-artifacts-${{ github.run_id }}-${{ github.run_attempt }}' \
+  'id: evidence' \
+  'umask 077' \
+  'mkdir -- "${TIER_ARTIFACTS_DIR}"' \
+  'rustfs-tier.log' \
+  'rustfs-tier-report.md' \
+  'rustfs-tier-cases.md' \
+  'rustfs-tier-gate.rc' \
+  'provenance.json' \
+  'Verify required tier evidence' \
+  'id: evidence_verify' \
+  'id: gate' \
+  'path: ${{ env.TIER_ARTIFACTS_DIR }}/' \
+  'if-no-files-found: error'; do
+  grep -Fq -- "${required}" "${WORKFLOW}" || fail "required contract is missing: ${required}"
+done
+
+step_block() {
+  local name="$1"
+  awk -v name="${name}" '
+    $0 == "      - name: " name { capture=1; found=1 }
+    capture && $0 != "      - name: " name && $0 ~ /^      - name: / { exit }
+    capture { print }
+    END { if (!found) exit 1 }
+  ' "${WORKFLOW}"
+}
+
+require_in_block() {
+  local block="$1" expected="$2" label="$3"
+  grep -Fqx -- "${expected}" <<< "${block}" \
+    || fail "${label} is missing: ${expected}"
+}
+
+verify_block="$(step_block 'Verify required tier evidence')" \
+  || fail "required-evidence step was not found"
+require_in_block "${verify_block}" \
+  "        if: \${{ always() && steps.evidence.outcome == 'success' }}" \
+  "required-evidence condition"
+require_in_block "${verify_block}" \
+  '          failed=0' \
+  "required-evidence failure accumulator"
+require_in_block "${verify_block}" \
+  '          [ "${failed}" -eq 0 ]' \
+  "required-evidence fail-closed result"
+require_in_block "${verify_block}" \
+  '            if [ ! -s "${TIER_ARTIFACTS_DIR}/${name}" ]; then' \
+  "required-file missing/empty predicate"
+require_in_block "${verify_block}" \
+  '            if [ ! -d "${TIER_ARTIFACTS_DIR}/${name}" ]; then' \
+  "required-directory missing predicate"
+for required_name in \
+  rustfs-tier.log \
+  rustfs-tier-report.md \
+  rustfs-tier-cases.md \
+  rustfs-tier-gate.rc \
+  provenance.json; do
+  grep -Fq -- "${required_name}" <<< "${verify_block}" \
+    || fail "required-evidence step does not verify ${required_name}"
+done
+require_in_block "${verify_block}" \
+  '          if ! find "${TIER_ARTIFACTS_DIR}/cases" -maxdepth 1 -type f -name '\''*.json'\'' -print -quit 2>/dev/null | grep -q .; then' \
+  "required atomic-case predicate"
+[ "$(grep -Fc '            failed=1' <<< "${verify_block}")" -eq 3 ] \
+  || fail "required-evidence step must fail for files, directories, and atomic cases"
+
+upload_block="$(step_block 'Upload report and logs')" \
+  || fail "upload step was not found"
+[ -n "${upload_block}" ] || fail "upload step was not found"
+require_in_block "${upload_block}" \
+  "        if: \${{ always() && steps.evidence.outcome == 'success' }}" \
+  "artifact upload condition"
+[ "$(grep -c '^[[:space:]]*path:' <<< "${upload_block}")" -eq 1 ] \
+  || fail "upload step must contain exactly one path"
+grep -Fq 'path: ${{ env.TIER_ARTIFACTS_DIR }}/' <<< "${upload_block}" \
+  || fail "upload step must archive only the run-scoped evidence directory"
+require_in_block "${upload_block}" \
+  '          if-no-files-found: error' \
+  "artifact upload empty-evidence behavior"
+
+gate_block="$(step_block 'Enforce tier suite result')" \
+  || fail "final gate step was not found"
+require_in_block "${gate_block}" '        if: always()' "final gate condition"
+require_in_block "${gate_block}" \
+  '          EVIDENCE_OUTCOME: ${{ steps.evidence.outcome }}' \
+  "final gate evidence status"
+require_in_block "${gate_block}" \
+  '          TEST_OUTCOME: ${{ steps.test.outcome }}' \
+  "final gate suite status"
+require_in_block "${gate_block}" \
+  '          GATE_RC_FILE: ${{ env.TIER_ARTIFACTS_DIR }}/rustfs-tier-gate.rc' \
+  "final gate structured status path"
+require_in_block "${gate_block}" \
+  '          if [ "${EVIDENCE_OUTCOME}" != "success" ]; then' \
+  "final gate evidence enforcement"
+require_in_block "${gate_block}" \
+  '          if [ "${TEST_OUTCOME}" != "success" ]; then' \
+  "final gate suite enforcement"
+require_in_block "${gate_block}" \
+  '          elif [ ! -s "${GATE_RC_FILE}" ]; then' \
+  "final gate missing-result enforcement"
+require_in_block "${gate_block}" \
+  '            if ! [[ "${GATE_RC}" =~ ^[0-9]+$ ]] || [ "${GATE_RC}" -ne 0 ]; then' \
+  "final gate nonzero-result enforcement"
+require_in_block "${gate_block}" \
+  '          [ "${failed}" -eq 0 ]' \
+  "final gate fail-closed result"
+
+issue_block="$(step_block 'File failure issue in rustfs/backlog')" \
+  || fail "failure-issue step was not found"
+require_in_block "${issue_block}" \
+  '          EVIDENCE_DIR: ${{ env.TIER_ARTIFACTS_DIR }}' \
+  "failure-issue evidence directory"
+require_in_block "${issue_block}" \
+  '          EVIDENCE_OUTCOME: ${{ steps.evidence.outcome }}' \
+  "failure-issue initialization status"
+require_in_block "${issue_block}" \
+  '          VERIFY_OUTCOME: ${{ steps.evidence_verify.outcome }}' \
+  "failure-issue verification status"
+require_in_block "${issue_block}" \
+  '          GATE_OUTCOME: ${{ steps.gate.outcome }}' \
+  "failure-issue final-gate status"
+require_in_block "${issue_block}" \
+  '            if [ "${EVIDENCE_OUTCOME}" != "success" ]; then' \
+  "failure-issue rejected-evidence guard"
+require_in_block "${issue_block}" \
+  '            elif [ ! -d "${EVIDENCE_DIR}" ] || [ -L "${EVIDENCE_DIR}" ]; then' \
+  "failure-issue unsafe-evidence guard"
+grep -Fq "steps.evidence_verify.outcome == 'failure'" <<< "${issue_block}" \
+  || fail "failure-issue condition does not cover evidence verification"
+grep -Fq "steps.gate.outcome == 'failure'" <<< "${issue_block}" \
+  || fail "failure-issue condition does not cover the final gate"
+
+step_line() {
+  local name="$1"
+  awk -v name="${name}" '$0 == "      - name: " name { print NR; exit }' "${WORKFLOW}"
+}
+verify_line="$(step_line 'Verify required tier evidence')"
+gate_line="$(step_line 'Enforce tier suite result')"
+issue_line="$(step_line 'File failure issue in rustfs/backlog')"
+[ -n "${verify_line}" ] && [ -n "${gate_line}" ] && [ -n "${issue_line}" ] \
+  || fail "cannot determine evidence/final-gate/failure-issue order"
+[ "${verify_line}" -lt "${gate_line}" ] && [ "${gate_line}" -lt "${issue_line}" ] \
+  || fail "failure issue must run after evidence verification and the final gate"
+
+printf 'tier artifact workflow contract is isolated\n'