346 lines
17 KiB
Bash
346 lines
17 KiB
Bash
#!/usr/bin/env bash
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# Shared safety rules. Configuration is trusted root-owned Bash, never archive input.
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set -Eeuo pipefail
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shopt -s inherit_errexit
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umask 077
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export LC_ALL=C
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die() { echo "ERROR: $*" >&2; exit 1; }
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need() { command -v "$1" >/dev/null || die "Missing tool: $1"; }
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helper() { python3 "$LIB_DIR/backup_set.py" "$@"; }
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secure_file() {
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[[ -f "$1" && ! -L "$1" ]] || die "Expected regular file: $1"
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[[ $(stat -c %u "$1") == 0 ]] || die "File must belong to root: $1"
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(( (8#$(stat -c %a "$1") & 8#022) == 0 )) || die "File writable by group/others: $1"
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}
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load_config() {
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[[ $EUID == 0 ]] || die "Run as root."
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secure_file "$CONFIG_FILE"
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# shellcheck disable=SC1090
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source "$CONFIG_FILE"
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: "${WORKDIR:=/var/backups/app-backup}"
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: "${STAGING_ROOT:=$WORKDIR/staging}" "${ARCHIVE_DIR:=$WORKDIR/archives}"
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: "${RESTORE_ROOT:=$WORKDIR/restore}" "${LOG_DIR:=/var/log/app-backup}"
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: "${LOCKFILE:=/run/app-backup.lock}" "${ARCHIVE_PREFIX:=appbackup}"
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: "${COMPRESSOR:=zstd}" "${ZSTD_LEVEL:=6}" "${ZSTD_THREADS:=2}"
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: "${LOG_RETENTION_DAYS:=30}"
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: "${MIN_FREE_GB:=10}" "${LOCAL_RETENTION_DAYS:=7}" "${REMOTE_RETENTION_DAYS:=30}"
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: "${RETENTION_KEEP_LAST:=3}" "${ENABLE_REMOTE_RETENTION:=false}"
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: "${ENABLE_UPLOAD:=true}" "${RCLONE_BIN:=rclone}"
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: "${RCLONE_REMOTE_BASE:=}" "${RCLONE_CONFIG:=/root/.config/rclone/rclone.conf}"
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: "${RCLONE_RETRIES:=6}" "${RCLONE_LOW_LEVEL_RETRIES:=20}"
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: "${RCLONE_RETRIES_SLEEP:=30s}" "${RCLONE_TIMEOUT:=1h}" "${RCLONE_CONTIMEOUT:=30s}"
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: "${RCLONE_TRANSFERS:=2}" "${RCLONE_CHECKERS:=4}" "${RCLONE_ONEDRIVE_CHUNK_SIZE:=80Mi}"
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: "${RCLONE_BWLIMIT:=0}" "${ENABLE_MAIL_REPORT:=true}" "${MAIL_TO:=johannes}"
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: "${ENABLE_WORDPRESS:=false}" "${ENABLE_NEXTCLOUD:=false}" "${ENABLE_NEXTCLOUD_DATA:=true}"
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: "${ENABLE_GITEA:=false}" "${ENABLE_MAIL:=false}" "${ENABLE_DB_DUMPS:=true}"
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: "${ENABLE_NEXTCLOUD_MAINTENANCE:=true}" "${NC_OCC_USER:=apache}"
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: "${ENABLE_GITEA_SERVICE_STOP:=true}" "${GITEA_SERVICE_NAME:=gitea}"
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: "${GITEA_DATA_DIR:=/var/lib/gitea/data}" "${GITEA_ETC_DIR:=/etc/gitea}"
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: "${ENABLE_HTTPD_STOP:=true}" "${HTTPD_SERVICE_NAME:=httpd}"
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: "${ENABLE_PHPFPM_STOP:=true}" "${PHPFPM_SERVICE_NAME:=php-fpm}"
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: "${MAIL_BACKUP_MODE:=stop}" "${ENABLE_MAIL_HOME_DIRS:=true}"
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: "${MAIL_DIR:=/var/vmail}" "${POSTFIX_DIR:=/etc/postfix}" "${DOVECOT_DIR:=/etc/dovecot}"
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: "${RESTORE_STRICT_DELETE:=false}"
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# Preserve old space-separated lists; arrays additionally support spaces in paths.
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if ! declare -p MAIL_HOME_DIRS &>/dev/null; then MAIL_HOME_DIRS=(/home/johannes /home/luciana); fi
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if [[ $(declare -p MAIL_HOME_DIRS) != 'declare -a '* ]]; then
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read -r -a MAIL_HOME_DIRS <<< "${MAIL_HOME_DIRS[0]}"
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fi
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if ! declare -p MAIL_HOME_EXCLUDES &>/dev/null; then
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MAIL_HOME_EXCLUDES=(OneDrive/ .cache/ .ccache/ .local/share/Trash/)
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elif [[ $(declare -p MAIL_HOME_EXCLUDES) != 'declare -a '* ]]; then
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read -r -a MAIL_HOME_EXCLUDES <<< "${MAIL_HOME_EXCLUDES[0]}"
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fi
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for v in ENABLE_UPLOAD ENABLE_REMOTE_RETENTION ENABLE_MAIL_REPORT ENABLE_WORDPRESS ENABLE_NEXTCLOUD \
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ENABLE_NEXTCLOUD_DATA ENABLE_GITEA ENABLE_MAIL ENABLE_DB_DUMPS ENABLE_NEXTCLOUD_MAINTENANCE \
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ENABLE_GITEA_SERVICE_STOP ENABLE_HTTPD_STOP ENABLE_PHPFPM_STOP ENABLE_MAIL_HOME_DIRS RESTORE_STRICT_DELETE; do
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[[ ${!v} == true || ${!v} == false ]] || die "$v must be true or false"
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done
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for v in LOG_RETENTION_DAYS MIN_FREE_GB LOCAL_RETENTION_DAYS REMOTE_RETENTION_DAYS RETENTION_KEEP_LAST ZSTD_LEVEL ZSTD_THREADS; do
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[[ ${!v} =~ ^(0|[1-9][0-9]*)$ ]] || die "$v must be a non-negative integer"
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done
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(( RETENTION_KEEP_LAST >= 2 )) || die "RETENTION_KEEP_LAST must be >= 2"
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(( ZSTD_LEVEL >= 1 && ZSTD_LEVEL <= 19 && ZSTD_THREADS >= 1 )) || die "Invalid zstd settings"
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[[ $ARCHIVE_PREFIX =~ ^[a-zA-Z0-9][a-zA-Z0-9_-]*$ ]] || die "Unsafe ARCHIVE_PREFIX"
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[[ $COMPRESSOR == zstd || $COMPRESSOR == gzip ]] || die "COMPRESSOR must be zstd or gzip"
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[[ $MAIL_BACKUP_MODE == stop || $MAIL_BACKUP_MODE == live ]] || die "MAIL_BACKUP_MODE must be stop or live"
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if [[ -z ${DB_DUMP_BIN:-} ]]; then DB_DUMP_BIN=$(command -v mariadb-dump || command -v mysqldump || true); fi
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if [[ -z ${DB_CLIENT_BIN:-} ]]; then DB_CLIENT_BIN=$(command -v mariadb || command -v mysql || true); fi
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}
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guard_workspaces() {
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local p src resolved other
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local sources=("${EXTRA_PATHS[@]}")
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if [[ $ENABLE_WORDPRESS == true ]]; then sources+=("${WP_DIR:-}"); fi
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if [[ $ENABLE_NEXTCLOUD == true ]]; then sources+=("${NC_DIR:-}" "${NC_DATA_DIR:-}"); fi
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if [[ $ENABLE_GITEA == true ]]; then sources+=("$GITEA_DATA_DIR" "$GITEA_ETC_DIR" "${GITEA_REPOS_DIR:-}" "${GITEA_CUSTOM_DIR:-}"); fi
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if [[ $ENABLE_MAIL == true ]]; then
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sources+=("$MAIL_DIR" "$POSTFIX_DIR" "$DOVECOT_DIR")
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if [[ $ENABLE_MAIL_HOME_DIRS == true ]]; then sources+=("${MAIL_HOME_DIRS[@]}"); fi
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fi
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# Validate the WHOLE plan before mkdir/chmod touches any configured directory.
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for p in "$WORKDIR" "$STAGING_ROOT" "$ARCHIVE_DIR" "$RESTORE_ROOT" "$LOG_DIR"; do
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resolved=$(realpath -m -- "$p")
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case $resolved in /|/etc|/usr|/usr/local|/var|/var/lib|/var/log|/var/backups|/home|/root|/tmp|/run|/opt|/srv)
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die "Use a dedicated working directory, not $resolved" ;;
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esac
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for src in "${sources[@]}"; do
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[[ -n $src ]] || continue
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other=$(realpath -m -- "$src")
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[[ $resolved != "$other" && $resolved != "$other/"* && $other != "$resolved/"* ]] || die "Source and working path overlap: $src / $p"
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done
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done
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}
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init_runtime() {
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need python3; need flock
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guard_workspaces
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# Both backup and restore, and the installer, take the same lock.
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[[ $LOCKFILE == /* && ! -L $LOCKFILE ]] || die "Unsafe lock path"
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if [[ -e $LOCKFILE ]]; then
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[[ -f $LOCKFILE && ! -s $LOCKFILE && $(stat -c %u "$LOCKFILE") == 0 ]] || die "Unsafe existing lock file"
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fi
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exec 9>"$LOCKFILE"
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flock -n 9 || die "Another backup/restore/update holds $LOCKFILE"
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for p in "$WORKDIR" "$STAGING_ROOT" "$ARCHIVE_DIR" "$RESTORE_ROOT" "$LOG_DIR"; do
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[[ $p == /* && $p != / && $p != *$'\n'* && $p != *$'\t'* ]] || die "Unsafe working path: $p"
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[[ ! -L $p ]] || die "Symlink working directory refused: $p"
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mkdir -p -- "$p"
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[[ $(stat -c %u "$p") == 0 ]] || die "Working directory must belong to root: $p"
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chmod 700 -- "$p"
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done
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RUN_ID="${ARCHIVE_PREFIX}_$(date -u +%Y-%m-%d_%H-%M-%S)_$(python3 -c 'import secrets; print(secrets.token_hex(4))')"
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LOG_FILE="$LOG_DIR/${OPERATION}_${RUN_ID}.log"
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# Journald already captures service stdout. No dependency on systemd-cat in terminals.
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exec > >(tee -a "$LOG_FILE") 2>&1
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echo "== $OPERATION $RUN_ID =="
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need rsync; need tar; need "$COMPRESSOR"
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STOPPED_SERVICES=(); NC_CHANGED=false; NC_WAS_ON=false; MUTATION_STARTED=false
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trap 'exit 130' INT
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trap 'exit 143' TERM
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trap finish EXIT
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}
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# Same canonical paths must not contain one another when backup writes into them.
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check_source_path() {
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local src p
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src=$(realpath -e -- "$1") || die "Missing source: $1"
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[[ -d $src && $src != / ]] || die "Source must be a directory other than /: $1"
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[[ $src != *$'\n'* && $src != *$'\t'* ]] || die "Unsupported control character in path"
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for p in "$WORKDIR" "$STAGING_ROOT" "$ARCHIVE_DIR" "$RESTORE_ROOT" "$LOG_DIR"; do
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p=$(realpath -m -- "$p")
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[[ $p != "$src" && $p != "$src/"* && $src != "$p/"* ]] || die "Source and working path overlap: $src / $p"
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done
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}
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# Build a stable component mapping. Restore destinations come ONLY from local config.
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build_plan() {
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LABELS=(); SOURCES=(); ROOTS=(); DB_LABELS=(); DB_NAMES=(); DB_CNFS=()
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if [[ $ENABLE_WORDPRESS == true ]]; then add_source wordpress "${WP_DIR:?Set WP_DIR}"; add_db wordpress WP; fi
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if [[ $ENABLE_NEXTCLOUD == true ]]; then
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add_source nextcloud "${NC_DIR:?Set NC_DIR}"
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: "${NC_DATA_DIR:=$NC_DIR/data}"
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if [[ $ENABLE_NEXTCLOUD_DATA == true ]]; then add_source nextcloud-data "$NC_DATA_DIR"; fi
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add_db nextcloud NC
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fi
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if [[ $ENABLE_GITEA == true ]]; then
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add_source gitea "$GITEA_DATA_DIR"; add_source gitea-etc "$GITEA_ETC_DIR"
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[[ -z ${GITEA_REPOS_DIR:-} ]] || add_source gitea-repos "$GITEA_REPOS_DIR"
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[[ -z ${GITEA_CUSTOM_DIR:-} ]] || add_source gitea-custom "$GITEA_CUSTOM_DIR"
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add_db gitea GITEA
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fi
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if [[ $ENABLE_MAIL == true ]]; then
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add_source mail "$MAIL_DIR"; add_source postfix "$POSTFIX_DIR"; add_source dovecot "$DOVECOT_DIR"
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if [[ $ENABLE_MAIL_HOME_DIRS == true ]]; then
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local i=0
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for p in "${MAIL_HOME_DIRS[@]}"; do add_source "mail-home-$i" "$p"; i=$((i+1)); done
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fi
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fi
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local i=0
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for p in "${EXTRA_PATHS[@]}"; do add_source "extra-$i" "$p"; i=$((i+1)); done
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(( ${#LABELS[@]} > 0 )) || die "No enabled sources"
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if [[ $ENABLE_NEXTCLOUD == true ]]; then
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local nc_path data_path
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nc_path=$(realpath -m -- "$NC_DIR"); data_path=$(realpath -m -- "$NC_DATA_DIR")
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[[ $nc_path != "$data_path" && $nc_path != "$data_path/"* ]] || die 'Nextcloud data must not contain the code directory'
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if [[ $ENABLE_WORDPRESS == true ]]; then
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[[ $(realpath -m -- "$WP_DIR") != "$nc_path" ]] || die 'WordPress and Nextcloud must not share the same directory'
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fi
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fi
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}
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add_source() { LABELS+=("$1"); SOURCES+=("$2"); ROOTS+=("files/$1"); }
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add_db() {
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[[ $ENABLE_DB_DUMPS == true ]] || return 0
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local n="${2}_DB_NAME" c="${2}_DB_CNF"
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[[ -n ${!n:-} && -n ${!c:-} ]] || die "Set $n and $c for enabled application"
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[[ ${!n} =~ ^[a-zA-Z0-9_][a-zA-Z0-9_-]*$ ]] || die "Unsupported database name: ${!n}"
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DB_LABELS+=("db-$1"); DB_NAMES+=("${!n}"); DB_CNFS+=("${!c}")
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}
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check_db_credentials() {
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local f
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for f in "${DB_CNFS[@]}"; do
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secure_file "$f"
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(( (8#$(stat -c %a "$f") & 8#077) == 0 )) || die "Use chmod 600 for DB credentials: $f"
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done
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}
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preflight() {
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for p in "${SOURCES[@]}"; do check_source_path "$p"; done
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check_db_credentials
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if (( ${#DB_LABELS[@]} )); then
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need "$DB_DUMP_BIN"; need "$DB_CLIENT_BIN"
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for i in "${!DB_LABELS[@]}"; do
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"$DB_CLIENT_BIN" --defaults-extra-file="${DB_CNFS[i]}" --database="${DB_NAMES[i]}" --execute='SELECT 1' >/dev/null
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done
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fi
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if [[ $ENABLE_NEXTCLOUD == true ]]; then need sudo; need php; [[ -f $NC_DIR/occ ]] || die "Nextcloud occ missing"; fi
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need systemctl
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if [[ $ENABLE_UPLOAD == true ]]; then check_remote; fi
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check_space "$STAGING_ROOT"; check_space "$ARCHIVE_DIR"
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}
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check_space() {
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local avail
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avail=$(df -PB1 -- "$1" | awk 'END{print $4}')
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(( avail >= MIN_FREE_GB * 1024 * 1024 * 1024 )) || die "Free-space reserve (${MIN_FREE_GB} GiB) unavailable on $1"
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}
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check_remote() {
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need "$RCLONE_BIN"
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[[ $RCLONE_REMOTE_BASE =~ ^[a-zA-Z0-9_-]+:[^:]+$ ]] || die "Use a named crypt remote with a dedicated non-empty path"
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[[ $RCLONE_REMOTE_BASE != *$'\n'* ]] || die "Invalid remote path"
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secure_file "$RCLONE_CONFIG"
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(( (8#$(stat -c %a "$RCLONE_CONFIG") & 8#077) == 0 )) || die "Use chmod 600 for rclone config"
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# Environment-defined backend types/settings could invalidate a config-only audit.
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local key name=${RCLONE_REMOTE_BASE%%:*}
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for key in ${!RCLONE_CONFIG_@}; do
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[[ $key == RCLONE_CONFIG_PASS ]] || die "Remote overrides through $key are unsupported; use the config file"
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done
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# Pipe directly into the parser: compatibility with older rclone without
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# config redacted. Secret values never go to the log or a temporary file.
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"$RCLONE_BIN" --config "$RCLONE_CONFIG" config show "$name" | helper crypt "$name"
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RCLONE_ARGS=(--config "$RCLONE_CONFIG" --no-check-certificate=false --crypt-filename-encryption standard
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--crypt-directory-name-encryption=true --crypt-no-data-encryption=false
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--retries "$RCLONE_RETRIES" --low-level-retries "$RCLONE_LOW_LEVEL_RETRIES"
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--retries-sleep "$RCLONE_RETRIES_SLEEP" --timeout "$RCLONE_TIMEOUT" --contimeout "$RCLONE_CONTIMEOUT"
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--transfers "$RCLONE_TRANSFERS" --checkers "$RCLONE_CHECKERS" --onedrive-chunk-size "$RCLONE_ONEDRIVE_CHUNK_SIZE"
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--bwlimit "$RCLONE_BWLIMIT")
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rc lsd "${name}:" --max-depth 1 >/dev/null
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}
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rc() { "$RCLONE_BIN" "${RCLONE_ARGS[@]}" "$@"; }
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# Exclusions are rooted so a nested directory named data is not accidentally lost.
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exclusions() {
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EXCLUDES=()
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local rel x
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if [[ $1 == wordpress ]]; then
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for x in "${NC_DIR:-}" "${NC_DATA_DIR:-}"; do
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[[ -n $x ]] || continue
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rel=$(realpath -m --relative-to="${WP_DIR}" -- "$x")
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if [[ $rel != .. && $rel != ../* && $rel != . ]]; then EXCLUDES+=("--exclude=/$rel/***"); fi
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done
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for x in "${WP_EXCLUDES[@]}"; do EXCLUDES+=("--exclude=$x"); done
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elif [[ $1 == nextcloud ]]; then
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rel=$(realpath -m --relative-to="$NC_DIR" -- "$NC_DATA_DIR")
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if [[ $rel != .. && $rel != ../* && $rel != . ]]; then EXCLUDES+=("--exclude=/$rel/***"); fi
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elif [[ $1 == mail-home-* ]]; then
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EXCLUDES+=(--one-file-system)
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for x in "${MAIL_HOME_EXCLUDES[@]}"; do EXCLUDES+=("--exclude=${x#--exclude=}"); done
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fi
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}
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stop_service() {
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local state
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state=$(systemctl show "$1" --property=ActiveState --value)
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case $state in
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active|activating|reloading)
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# Record intent before stop: a failed/partial stop still needs recovery.
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STOPPED_SERVICES+=("$1")
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save_recovery
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systemctl stop "$1"
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;;
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inactive|failed) ;;
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*) die "Unknown/transitioning service state for $1: $state" ;;
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esac
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}
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occ() { sudo -u "$NC_OCC_USER" php "$NC_DIR/occ" "$@"; }
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quiesce() {
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if [[ $ENABLE_NEXTCLOUD == true ]]; then
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if [[ $ENABLE_NEXTCLOUD_MAINTENANCE == true ]]; then
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local status
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status=$(occ status --output=json)
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NC_WAS_ON=$(printf '%s' "$status" | python3 -c 'import json,sys; d=json.load(sys.stdin); assert isinstance(d["maintenance"], bool); print(str(d["maintenance"]).lower())')
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if [[ $NC_WAS_ON == false ]]; then NC_CHANGED=true; save_recovery; occ maintenance:mode --on; fi
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else echo "WARNING: Nextcloud maintenance disabled; consistency depends on external writer shutdown"; fi
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fi
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# Include application cron/worker services in this array; crond itself is not stopped.
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for p in "${QUIESCE_SERVICES[@]}"; do stop_service "$p"; done
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if [[ $ENABLE_WORDPRESS == true || $ENABLE_NEXTCLOUD == true ]]; then
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if [[ $ENABLE_HTTPD_STOP == true ]]; then stop_service "$HTTPD_SERVICE_NAME"; fi
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if [[ $ENABLE_PHPFPM_STOP == true ]]; then stop_service "$PHPFPM_SERVICE_NAME"; fi
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fi
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if [[ $ENABLE_GITEA == true ]]; then
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if [[ $ENABLE_GITEA_SERVICE_STOP == true ]]; then stop_service "$GITEA_SERVICE_NAME"; else echo "WARNING: Gitea is not stopped"; fi
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fi
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if [[ $ENABLE_MAIL == true ]]; then
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if [[ $MAIL_BACKUP_MODE == stop ]]; then stop_service postfix; stop_service dovecot
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else echo "WARNING: live mail copy is not a consistent snapshot"; fi
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fi
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}
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# Survives SIGKILL/power loss, which Bash traps cannot handle. This is an
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# instruction record for the operator, not an automatically executed recovery.
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save_recovery() {
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python3 - "$WORKDIR/recovery-$RUN_ID.json" "$OPERATION" "$NC_CHANGED" "$NC_WAS_ON" "${STAGING_DIR:-}" "${STOPPED_SERVICES[@]}" <<'PYREC'
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import json,os,sys
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path,operation,changed,was_on,staging,*services=sys.argv[1:]
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with open(path+'.tmp','w') as stream:
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json.dump(dict(operation=operation, staging=staging, nextcloud_changed=changed=='true', nextcloud_was_on=was_on=='true', stopped_services=services),stream,indent=2)
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stream.flush()
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os.fsync(stream.fileno())
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os.replace(path+'.tmp',path)
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PYREC
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}
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resume_services() {
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local failed=0 i
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if [[ $NC_CHANGED == true ]]; then
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if occ maintenance:mode --off; then NC_CHANGED=false; else failed=1; fi
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fi
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for ((i=${#STOPPED_SERVICES[@]}-1; i>=0; i--)); do
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[[ -n ${STOPPED_SERVICES[i]} ]] || continue
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if systemctl start "${STOPPED_SERVICES[i]}"; then STOPPED_SERVICES[i]=''; else failed=1; fi
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done
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if (( failed == 0 )); then
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rm -f -- "$WORKDIR/recovery-$RUN_ID.json"
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else save_recovery; fi
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return "$failed"
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}
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finish() {
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local code=$?
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trap - EXIT INT TERM
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set +e
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if [[ $OPERATION == restore && $MUTATION_STARTED == true && $code != 0 ]]; then
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if [[ $ENABLE_NEXTCLOUD == true ]]; then occ maintenance:mode --on || echo 'ERROR: Could not enforce Nextcloud maintenance'; fi
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save_recovery
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echo "ERROR: Partial restore. Service recovery requires manual review: ${STOPPED_SERVICES[*]}"
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echo "ERROR: Keep Nextcloud in maintenance; review $LOG_FILE before restarting."
|
|
else
|
|
resume_services || code=1
|
|
fi
|
|
if [[ $code == 0 && -n ${STAGING_DIR:-} ]]; then rm -rf -- "$STAGING_DIR" || code=1; fi
|
|
if [[ $code != 0 ]]; then echo "FAILED (exit $code). Retained work: ${STAGING_DIR:-none}"; fi
|
|
# Persist status separately from --check; failed status writes also fail the job.
|
|
if [[ ${CHECK:-false} != true ]]; then
|
|
helper status "$WORKDIR" "$OPERATION" "$RUN_ID" "$code" || code=1
|
|
fi
|
|
if [[ ${CHECK:-false} != true && $ENABLE_MAIL_REPORT == true && $OPERATION == backup ]]; then
|
|
if [[ -x /usr/sbin/sendmail && $MAIL_TO != *$'\n'* && $MAIL_TO != *$'\r'* ]]; then
|
|
{ printf 'To: %s\nSubject: [app-backup] exit=%s %s\nContent-Type: text/plain; charset=UTF-8\n\nLog: %s\n' "$MAIL_TO" "$code" "$RUN_ID" "$LOG_FILE"; tail -n 80 "$LOG_FILE"; } |
|
|
/usr/sbin/sendmail -t || echo "WARNING: report delivery failed"
|
|
else echo "WARNING: mail report unavailable (sendmail/recipient)"; fi
|
|
fi
|
|
exit "$code"
|
|
}
|