建立每日自动异机备份基线（07-27-automatic-offhost-backup）
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#!/usr/bin/env bash
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set -euo pipefail
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CONFIG_FILE="${RECEIVER_CONFIG_FILE:-/etc/hyb-oa-offhost-backup.conf}"
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if [[ -f "$CONFIG_FILE" ]]; then
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# Root-owned installer output with path-only assignments.
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# shellcheck disable=SC1090
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source "$CONFIG_FILE"
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fi
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BACKUP_INBOX_DIR="${BACKUP_INBOX_DIR:-}"
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BACKUP_ARCHIVE_DIR="${BACKUP_ARCHIVE_DIR:-}"
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BACKUP_WEEKLY_DIR="${BACKUP_WEEKLY_DIR:-}"
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RRSYNC_BIN="${RRSYNC_BIN:-/usr/bin/rrsync}"
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PYTHON_BIN="${PYTHON_BIN:-python3}"
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DAILY_KEEP="${DAILY_KEEP:-7}"
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WEEKLY_KEEP="${WEEKLY_KEEP:-4}"
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fail() {
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echo "[offhost-receiver][ERROR] $1" >&2
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exit 1
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}
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validate_absolute_path() {
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local name="$1"
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local value="$2"
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if [[ -z "$value" || "$value" != /* || ! "$value" =~ ^/[A-Za-z0-9._/-]+$ ]]; then
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fail "$name must be an explicit safe absolute path"
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fi
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if [[ "$value" == "/" || "$value" == */ || "$value" == *"//"* \
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|| "/$value/" == *"/../"* || "/$value/" == *"/./"* ]]; then
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fail "$name contains an unsafe path segment"
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fi
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}
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validate_layout() {
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local name value
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for name in BACKUP_INBOX_DIR BACKUP_ARCHIVE_DIR BACKUP_WEEKLY_DIR; do
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value="${!name:-}"
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validate_absolute_path "$name" "$value"
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[[ -d "$value" && ! -L "$value" ]] || fail "$name is not an existing regular directory"
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done
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if [[ "$BACKUP_INBOX_DIR" == "$BACKUP_ARCHIVE_DIR" \
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|| "$BACKUP_INBOX_DIR" == "$BACKUP_WEEKLY_DIR" \
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|| "$BACKUP_ARCHIVE_DIR" == "$BACKUP_WEEKLY_DIR" ]]; then
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fail "backup receiver directories must be distinct"
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fi
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local first second
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for first in "$BACKUP_INBOX_DIR" "$BACKUP_ARCHIVE_DIR" "$BACKUP_WEEKLY_DIR"; do
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for second in "$BACKUP_INBOX_DIR" "$BACKUP_ARCHIVE_DIR" "$BACKUP_WEEKLY_DIR"; do
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if [[ "$first" != "$second" && ( "$first" == "$second"/* || "$second" == "$first"/* ) ]]; then
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fail "backup receiver directories must not be nested"
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fi
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done
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done
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if [[ "$(stat -c %d "$BACKUP_INBOX_DIR")" != "$(stat -c %d "$BACKUP_ARCHIVE_DIR")" \
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|| "$(stat -c %d "$BACKUP_ARCHIVE_DIR")" != "$(stat -c %d "$BACKUP_WEEKLY_DIR")" ]]; then
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fail "receiver directories must share a filesystem for atomic finalize and weekly hardlinks"
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fi
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[[ "$DAILY_KEEP" =~ ^[1-9][0-9]*$ ]] || fail "DAILY_KEEP must be positive"
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[[ "$WEEKLY_KEEP" =~ ^[1-9][0-9]*$ ]] || fail "WEEKLY_KEEP must be positive"
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command -v "$PYTHON_BIN" >/dev/null 2>&1 || fail "python3 is required"
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}
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validate_run_id() {
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local run_id="$1"
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[[ "$run_id" =~ ^auto-[0-9]{8}T[0-9]{6}Z$ ]] \
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|| fail "run id must use auto-YYYYMMDDTHHMMSSZ"
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local run_day="${run_id#auto-}"
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run_day="${run_day%%T*}"
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[[ "$run_day" == "$(date -u +%Y%m%d)" || "$run_day" == "$(date -u -d yesterday +%Y%m%d)" ]] \
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|| fail "run id UTC day is outside the accepted receiver window"
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}
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validate_batch() {
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local batch_dir="$1"
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local run_id="$2"
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local expected_manifest_sha="$3"
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[[ -d "$batch_dir" && ! -L "$batch_dir" ]] || fail "partial batch is missing"
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[[ "$expected_manifest_sha" =~ ^[0-9a-f]{64}$ ]] || fail "manifest SHA-256 is invalid"
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local entry_count regular_count
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entry_count="$(find "$batch_dir" -mindepth 1 -maxdepth 1 -printf '.' | wc -c | tr -d ' ')"
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regular_count="$(find "$batch_dir" -mindepth 1 -maxdepth 1 -type f -printf '.' | wc -c | tr -d ' ')"
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[[ "$entry_count" == "3" && "$regular_count" == "3" ]] \
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|| fail "batch must contain exactly three regular files"
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for file_name in database.dump storage.tar.gz manifest.json; do
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[[ -f "$batch_dir/$file_name" && ! -L "$batch_dir/$file_name" ]] \
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|| fail "batch required file is missing"
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done
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local actual_manifest_sha
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actual_manifest_sha="$(sha256sum "$batch_dir/manifest.json" | awk '{print $1}')"
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[[ "$actual_manifest_sha" == "$expected_manifest_sha" ]] \
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|| fail "manifest checksum mismatch"
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"$PYTHON_BIN" - "$batch_dir" "$run_id" <<'PYTHON'
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import hashlib
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import json
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import os
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import sys
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batch_dir, expected_run_id = sys.argv[1:]
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manifest_path = os.path.join(batch_dir, "manifest.json")
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with open(manifest_path, "r", encoding="utf-8") as handle:
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manifest = json.load(handle)
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if manifest.get("schemaVersion") != 1:
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raise SystemExit("unsupported manifest schema")
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if manifest.get("status") != "complete" or manifest.get("runId") != expected_run_id:
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raise SystemExit("manifest identity mismatch")
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if not manifest.get("buildSha") and not manifest.get("sourceImageDigest"):
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raise SystemExit("manifest source identity missing")
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artifacts = manifest.get("artifacts") or {}
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expected = {
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"database": "database.dump",
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"storage": "storage.tar.gz",
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}
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for key, expected_name in expected.items():
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artifact = artifacts.get(key) or {}
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if artifact.get("file") != expected_name:
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raise SystemExit("manifest artifact name mismatch")
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file_path = os.path.join(batch_dir, expected_name)
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if os.path.getsize(file_path) != artifact.get("bytes"):
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raise SystemExit("manifest artifact size mismatch")
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digest = hashlib.sha256()
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with open(file_path, "rb") as handle:
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for chunk in iter(lambda: handle.read(1024 * 1024), b""):
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digest.update(chunk)
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if digest.hexdigest() != artifact.get("sha256"):
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raise SystemExit("manifest artifact checksum mismatch")
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PYTHON
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}
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prune_named_directories() {
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local root="$1"
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local prefix="$2"
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local keep="$3"
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local -a entries=()
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mapfile -t entries < <(find "$root" -mindepth 1 -maxdepth 1 -type d \
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-name "${prefix}*" -printf '%f\n' | LC_ALL=C sort)
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local remove_count=$((${#entries[@]} - keep))
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if (( remove_count <= 0 )); then
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return 0
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fi
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local index entry target
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for ((index = 0; index < remove_count; index += 1)); do
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entry="${entries[$index]}"
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target="$root/$entry"
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[[ "$entry" == "$prefix"* && -d "$target" && ! -L "$target" ]] \
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|| fail "retention target failed safety validation"
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rm -rf -- "$target"
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done
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}
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finalize_batch() {
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local run_id="$1"
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local expected_manifest_sha="$2"
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validate_run_id "$run_id"
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validate_layout
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local batch_name="hyb-oa-backup-$run_id"
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local partial_dir="$BACKUP_INBOX_DIR/${batch_name}.partial"
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local archive_dir="$BACKUP_ARCHIVE_DIR/$batch_name"
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local already_archived=0
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if [[ -e "$archive_dir" ]]; then
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[[ -d "$archive_dir" && ! -L "$archive_dir" ]] || fail "archive target is invalid"
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validate_batch "$archive_dir" "$run_id" "$expected_manifest_sha"
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already_archived=1
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fi
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local run_day="${run_id#auto-}"
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run_day="${run_day%%T*}"
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local existing_for_day
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existing_for_day="$(find "$BACKUP_ARCHIVE_DIR" -mindepth 1 -maxdepth 1 -type d \
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-name "hyb-oa-backup-auto-${run_day}T*Z" ! -name "$batch_name" -print -quit)"
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[[ -z "$existing_for_day" ]] || fail "another automatic archive already exists for this UTC day"
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if [[ "$already_archived" == "0" ]]; then
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validate_batch "$partial_dir" "$run_id" "$expected_manifest_sha"
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chmod 0400 "$partial_dir/database.dump" "$partial_dir/storage.tar.gz" "$partial_dir/manifest.json"
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mv -- "$partial_dir" "$archive_dir"
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fi
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local iso_week
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iso_week="$($PYTHON_BIN - "$run_day" <<'PYTHON'
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from datetime import datetime
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import sys
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day = datetime.strptime(sys.argv[1], "%Y%m%d").date()
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iso = day.isocalendar()
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print(f"week-{iso.year:04d}-W{iso.week:02d}")
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PYTHON
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)"
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local weekly_dir="$BACKUP_WEEKLY_DIR/$iso_week"
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if [[ ! -e "$weekly_dir" ]]; then
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cp -al -- "$archive_dir" "$weekly_dir"
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fi
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prune_named_directories "$BACKUP_ARCHIVE_DIR" "hyb-oa-backup-auto-" "$DAILY_KEEP"
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prune_named_directories "$BACKUP_WEEKLY_DIR" "week-" "$WEEKLY_KEEP"
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echo "[offhost-receiver][PASS] finalized batch with verified manifest"
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}
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run_forced_command() {
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validate_layout
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local original_command="${SSH_ORIGINAL_COMMAND:-}"
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if [[ "$original_command" == rsync\ --server\ * ]]; then
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if [[ "$original_command" =~ (^|[[:space:]])--sender([[:space:]]|$) ]]; then
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fail "read access is forbidden"
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fi
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if [[ "$original_command" =~ (^|[[:space:]])--(delete|delete-before|delete-after|delete-during|delete-delay|delete-excluded|remove-source-files|remove-sent-files|inplace)(=|[[:space:]]|$) ]]; then
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fail "destructive rsync option is forbidden"
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fi
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[[ -x "$RRSYNC_BIN" ]] || fail "rrsync is required"
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exec "$RRSYNC_BIN" -wo "$BACKUP_INBOX_DIR"
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fi
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if [[ "$original_command" =~ ^hyb-backup-finalize[[:space:]](auto-[0-9]{8}T[0-9]{6}Z)[[:space:]]([0-9a-f]{64})$ ]]; then
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finalize_batch "${BASH_REMATCH[1]}" "${BASH_REMATCH[2]}"
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return 0
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fi
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fail "unsupported forced command"
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}
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case "${1:-forced}" in
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forced)
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run_forced_command
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;;
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finalize-test)
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[[ "${RECEIVER_TEST_MODE:-0}" == "1" ]] || fail "test mode is disabled"
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finalize_batch "${2:-}" "${3:-}"
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;;
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validate-config)
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validate_layout
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echo "[offhost-receiver][PASS] configuration valid"
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;;
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*)
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fail "unsupported mode"
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;;
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esac
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