ci: reuse the normal build for an advisory ABI/API check, published safely

.ci-local/abicheck-diff.sh

@@ -0,0 +1,196 @@
+#!/bin/sh
+# Advisory ABICheck scan.  abi-diff.sh / ABICC remains authoritative.
+set -eu
+
+OLD_REF=${1:-}
+NEW_REF=${2:-HEAD}
+ABICHECK=${ABICHECK:-abicheck}
+JOBS=${ABICHECK_MAKE_JOBS:-2}
+REPORT_ROOT=${ABICHECK_REPORT_ROOT:-compat_reports/abicheck}
+RUN_ROOT=${RUNNER_TEMP:-${TMPDIR:-/tmp}}/pvxs-abicheck-${GITHUB_RUN_ID:-$$}
+
+explicit_old=1
+new_sha=$(git rev-parse "$NEW_REF^{commit}")
+if [ -z "$OLD_REF" ]; then
+    explicit_old=0
+    OLD_REF=$(git describe --tags --abbrev=0 "$new_sha")
+fi
+old_sha=$(git rev-parse "$OLD_REF^{commit}")
+if [ "$explicit_old" -eq 0 ] && [ "$old_sha" = "$new_sha" ]; then
+    OLD_REF=$(git describe --tags --abbrev=0 "$new_sha^")
+    old_sha=$(git rev-parse "$OLD_REF^{commit}")
+fi
+
+mkdir -p "$RUN_ROOT" "$REPORT_ROOT"
+export HOME="$RUN_ROOT/home"
+export XDG_CACHE_HOME="$RUN_ROOT/cache"
+export TMPDIR="$RUN_ROOT/tmp"
+mkdir -p "$HOME" "$XDG_CACHE_HOME" "$TMPDIR"
+
+EPICS_BASE=${EPICS_BASE:-}
+if [ -z "$EPICS_BASE" ] && [ -f configure/RELEASE.local ]; then
+    EPICS_BASE=$(sed -n -E 's/^[[:space:]]*EPICS_BASE[[:space:]]*=[[:space:]]*//p' configure/RELEASE.local | tail -n 1)
+fi
+[ -n "$EPICS_BASE" ] && [ -d "$EPICS_BASE/include" ] || {
+    echo "EPICS_BASE include tree unavailable; use cue.py exec after prepare" >&2
+    exit 64
+}
+command -v bear >/dev/null || { echo "bear is required for complete build evidence" >&2; exit 64; }
+
+OLD_SRC="$RUN_ROOT/old"
+NEW_SRC="$RUN_ROOT/new"
+# git archive has no enclosing directory; extract each revision into its own
+# fixed root so paths and build evidence remain side-specific.
+mkdir -p "$OLD_SRC" "$NEW_SRC"
+git archive "$old_sha" | tar -C "$OLD_SRC" -xf -
+git archive "$new_sha" | tar -C "$NEW_SRC" -xf -
+
+prepare_build() {
+    src=$1
+    [ -f configure/RELEASE.local ] && cp configure/RELEASE.local "$src/configure/"
+    [ -f configure/CONFIG_SITE.local ] && cp configure/CONFIG_SITE.local "$src/configure/"
+    sed -i -e "s|\$(TOP)|$(pwd)|g" -e 's|-Werror||g' "$src"/configure/*.local 2>/dev/null || true
+    bear --output "$src/compile_commands.json" -- \
+      make -C "$src" CROSS_COMPILER_TARGET_ARCHS= OPT_CFLAGS='-g -Og' OPT_CXXFLAGS='-g -Og' ioc -j"$JOBS"
+}
+
+prepare_build "$OLD_SRC"
+prepare_build "$NEW_SRC"
+
+stage_headers() {
+    src=$1
+    target=$2
+    out=$3
+    mkdir -p "$out/pvxs"
+    if [ "$target" = libpvxs ]; then
+        awk '/^INC[[:space:]]*\+=[[:space:]]*pvxs\// {print $3}' "$src/src/Makefile" | while read -r header; do
+            header_src="$src/src/$header"
+            [ "$header" != pvxs/versionNum.h ] || header_src="$src/src/O.Common/$header"
+            [ -f "$header_src" ] || { echo "missing public header $header" >&2; exit 64; }
+            mkdir -p "$out/$(dirname "$header")"
+            cp "$header_src" "$out/$header"
+        done
+    else
+        cp "$src/ioc/pvxs/iochooks.h" "$out/pvxs/iochooks.h"
+    fi
+}
+
+project_compile_db() {
+    src=$1
+    target=$2
+    out=$3
+    python3 - "$src/compile_commands.json" "$src" "$target" "$out" <<'PY'
+import json, pathlib, sys
+entries = json.load(open(sys.argv[1]))
+source_root = pathlib.Path(sys.argv[2]).resolve()
+target, out = sys.argv[3:]
+component_root = (source_root / ('src' if target == 'libpvxs' else 'ioc')).resolve()
+selected = []
+for entry in entries:
+    source = pathlib.Path(entry['file'])
+    if not source.is_absolute():
+        source = pathlib.Path(entry.get('directory') or source_root) / source
+    try:
+        source.resolve().relative_to(component_root)
+    except ValueError:
+        continue
+    selected.append(entry)
+if not selected:
+    raise SystemExit(f'no compile commands selected for {target}')
+json.dump(selected, open(out, 'w'), indent=2)
+PY
+}
+
+find_dso() {
+    matches=$(find "$1/lib" -type f -name "$2.so.*" -print | LC_ALL=C sort)
+    count=$(printf '%s\n' "$matches" | sed '/^$/d' | wc -l)
+    [ "$count" -eq 1 ] || {
+        echo "expected one $2 DSO below $1/lib, found $count" >&2
+        return 64
+    }
+    printf '%s\n' "$matches"
+}
+
+old_id=$(printf '%s' "$old_sha" | cut -c1-12)
+new_id=$(printf '%s' "$new_sha" | cut -c1-12)
+status_file="$REPORT_ROOT/summary.json"
+printf '{"old_ref":"%s","old_sha":"%s","new_ref":"%s","new_sha":"%s","targets":[' \
+  "$OLD_REF" "$old_sha" "$NEW_REF" "$new_sha" > "$status_file"
+first=1
+overall=0
+
+run_one() {
+    target=$1
+    oldso=$(find_dso "$OLD_SRC" "$target")
+    newso=$(find_dso "$NEW_SRC" "$target")
+    [ -n "$oldso" ] && [ -n "$newso" ] || return 64
+    old_headers="$RUN_ROOT/headers-old-$target"
+    new_headers="$RUN_ROOT/headers-new-$target"
+    stage_headers "$OLD_SRC" "$target" "$old_headers" || return $?
+    stage_headers "$NEW_SRC" "$target" "$new_headers" || return $?
+    old_db="$OLD_SRC/compile_commands.$target.json"
+    new_db="$NEW_SRC/compile_commands.$target.json"
+    project_compile_db "$OLD_SRC" "$target" "$old_db" || return $?
+    project_compile_db "$NEW_SRC" "$target" "$new_db" || return $?
+    base="$REPORT_ROOT/${target}_${old_id}_to_${new_id}"
+    if "$ABICHECK" compare "$oldso" "$newso" \
+      --version "old=$old_sha" --version "new=$new_sha" \
+      --header "old=$old_headers" --header "new=$new_headers" \
+      --include "old:pvxs=$old_headers" --include "new:pvxs=$new_headers" \
+      --include "old:epics=$EPICS_BASE/include" --include "new:epics=$EPICS_BASE/include" \
+      --include "old:epics-os=$EPICS_BASE/include/os/Linux" --include "new:epics-os=$EPICS_BASE/include/os/Linux" \
+      --include "old:epics-gcc=$EPICS_BASE/include/compiler/gcc" --include "new:epics-gcc=$EPICS_BASE/include/compiler/gcc" \
+      --depth source --sources "old=$OLD_SRC" --sources "new=$NEW_SRC" \
+      --build-info "old=$old_db" --build-info "new=$new_db" \
+      --config "$PWD/.ci-local/abicheck.yml" \
+      --format review --write "json=$base.json" -o "$base.md"
+    then
+        rc=0
+    else
+        rc=$?
+    fi
+    if [ ! -s "$base.json" ] || [ ! -s "$base.md" ]; then
+        echo "missing comparison reports for $target" >&2
+        rc=64
+    elif ! python3 - "$base.json" <<'PY'
+import json, sys
+report = json.load(open(sys.argv[1]))
+if report.get("analysis_assurance_exit_contribution") not in (0, None):
+    raise SystemExit("analysis assurance is incomplete")
+PY
+    then
+        echo "incomplete analysis assurance for $target" >&2
+        rc=1
+    fi
+    printf '%s\n' "$rc" > "$RUN_ROOT/$target.exit-code"
+    if [ -n "${GITHUB_STEP_SUMMARY:-}" ] && [ -f "$base.md" ]; then cat "$base.md" >> "$GITHUB_STEP_SUMMARY"; fi
+    case "$rc" in 0|2|4) return 0;; *) return "$rc";; esac
+}
+
+append_target() {
+    target=$1
+    rc=$2
+    base="$REPORT_ROOT/${target}_${old_id}_to_${new_id}"
+    [ "$first" -eq 1 ] || printf ',' >> "$status_file"
+    first=0
+    if [ -f "$base.json" ]; then
+        printf '{"target":"%s","exit_code":%s,"report":"%s.json"}' "$target" "$rc" "$(basename "$base")" >> "$status_file"
+    else
+        printf '{"target":"%s","exit_code":%s,"report":null}' "$target" "$rc" >> "$status_file"
+    fi
+}
+
+for target in libpvxs libpvxsIoc; do
+    if run_one "$target"; then
+        rc=0
+    else
+        rc=$?
+    fi
+    if [ -f "$RUN_ROOT/$target.exit-code" ]; then
+        rc=$(cat "$RUN_ROOT/$target.exit-code")
+    fi
+    append_target "$target" "$rc"
+    case "$rc" in 0|2|4) ;; *) overall=1;; esac
+done
+printf '],"integration_health":%s}\n' "$overall" >> "$status_file"
+exit "$overall"

.ci-local/abicheck.yml

@@ -0,0 +1,8 @@
+# CastXML packaged on the GitHub runner cannot parse libstdc++ with PVXS's
+# default C++11 mode.  This is deliberately recorded as extraction context;
+# the libraries themselves keep PVXS's normal build flags.
+compile:
+  options:
+    - -std=c++17
+assurance:
+  require_complete: true

.github/workflows/abicheck-shadow.yml

@@ -0,0 +1,78 @@
+name: ABICheck shadow ABI scan
+
+on:
+  pull_request:
+  push:
+    branches: [master]
+    tags: ['*']
+  workflow_dispatch:
+
+concurrency:
+  group: abicheck-shadow-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+# The scanner is an advisory, parallel signal.  It needs no PR comments, no
+# status write access, and no repository secrets.
+permissions:
+  contents: read
+
+jobs:
+  abicheck-shadow:
+    runs-on: ubuntu-latest
+    # A full source-evidence scan runs two revisions of both public DSOs.
+    # Keep this above the measured ~100-minute worst case, not at 45 minutes.
+    timeout-minutes: 120
+    env:
+      SETUP_PATH: .ci-local
+      SET: defaults
+      CMP: gcc
+      BCFG: default
+      BASE: "7.0"
+      _PVXS_ABORT_ON_CRIT: 1
+      PVXS_LOG: pvxs.*=WARN
+      ABICHECK_MAKE_JOBS: "2"
+      ABICHECK_REF: 0ab7da2eba3016bcad86657fb74239c66ef3ffeb
+
+    steps:
+    - uses: actions/checkout@v6
+      with:
+        fetch-depth: "0"
+        submodules: true
+        persist-credentials: false
+
+    - name: Install scanner tools
+      shell: bash
+      run: |
+        set -euxo pipefail
+        sudo apt-get update
+        sudo apt-get -y install libreadline-dev libevent-dev cmake bear
+        /usr/share/miniconda/bin/conda install -y -c conda-forge castxml
+        VENV="$RUNNER_TEMP/abicheck-venv"
+        python -m venv "$VENV"
+        "$VENV/bin/pip" install --disable-pip-version-check \
+          "git+https://github.com/abicheck/abicheck@${ABICHECK_REF}"
+        echo "/usr/share/miniconda/bin" >> "$GITHUB_PATH"
+        echo "$VENV/bin" >> "$GITHUB_PATH"
+        echo "ABICHECK=$VENV/bin/abicheck" >> "$GITHUB_ENV"
+
+    - name: Verify scanner tools
+      shell: bash
+      run: |
+        set -euxo pipefail
+        castxml --version
+        "$ABICHECK" --version
+
+    - name: Prepare EPICS dependencies
+      run: python .ci/cue.py prepare
+
+    - name: Run full source-evidence shadow scan
+      run: python .ci/cue.py exec ./.ci-local/abicheck-diff.sh
+
+    - name: Upload ABICheck reports
+      if: ${{ always() }}
+      uses: actions/upload-artifact@v7
+      with:
+        retention-days: 30
+        name: abicheck-shadow
+        path: compat_reports/abicheck
+        if-no-files-found: error