155 lines
3.1 KiB
Bash
155 lines
3.1 KiB
Bash
#!/bin/bash
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SERVICE=minecraft.service
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BACKUP_DIR=/opt/minecraft/backup
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VAR_DIR=/opt/minecraft/var
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SCRATCH=$(mktemp -p /var/tmp -d minecraft.XXXXXXXXXX)
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NICE=15
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TAR=minecraft-$(date +%Y-%m-%d).tar
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WAIT=30
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VERBOSE=${VERBOSE:-4}
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declare -A LOG_LEVELS
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LOG_LEVELS=(
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[emerg]=0
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[alert]=1
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[crit]=2
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[err]=3
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[warning]=4
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[notice]=5
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[info]=6
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[debug]=7
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)
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log() {
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local LEVEL
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local TS
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LEVEL=$1
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TS="$(date -Is)"
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shift
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if [[ $VERBOSE -ge ${LOG_LEVELS[$LEVEL]} ]]; then
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if [[ $# -ge 2 ]]; then
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local FMT=$1
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shift
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printf "%s [%s] ${FMT}\n" "${TS}" "$LEVEL" "$@"
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else
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echo "${TS} [$LEVEL]" "$@"
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fi
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fi
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}
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finish() {
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log info "Cleaning up"
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rm -rf "$SCRATCH"
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if ! systemctl -q is-active "$SERVICE"; then
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start_server $SERVICE
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fi
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}
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trap finish EXIT
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error_exit() {
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log crit "$1"
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exit 1
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}
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stop_server() {
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local unit="${1:-$SERVICE}"
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local attempts="${2:-$WAIT}"
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if ! systemctl -q is-active "$unit"; then
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log warning "%s is already stopped\n" "$unit"
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return 0
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fi
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systemctl -q stop "$unit"
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while systemctl -q is-active "$unit"; do
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log warning "Waiting for %s to stop ... (%s)\n" "$unit" "$attempts"
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((attempts--))
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if ((attempts == 0)); then
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return 1
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fi
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sleep 1
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done
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return 0
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}
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start_server() {
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local unit="${1:-$SERVICE}"
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local attempts="${2:-$WAIT}"
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if systemctl -q is-active "$unit"; then
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log warning "%s is already started\n" "$unit"
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return 0
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fi
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systemctl -q start "$unit"
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while ! systemctl -q is-active "$unit"; do
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log warning "Waiting for %s to start ... (%d)\n" "$unit" "$attempts"
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((attempts--))
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if ((attempts == 0)); then
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return 1
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fi
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sleep 1
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done
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return 0
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}
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open_files() {
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local dir=${1-$VAR_DIR}
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local attempts="${2:-$WAIT}"
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while (($(lsof +D "$dir" | wc -l) > 0)); do
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log warning "Waiting for open files ... (%d)\n" "$attempts"
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((attempts--))
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if ((attempts == 0)); then
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return 1
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fi
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sleep 1
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done
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return 0
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}
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main() {
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log info "Stopping %s" $SERVICE
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if ! stop_server $SERVICE; then
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error_exit "Failed to stop $SERVICE"
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fi
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log info "Checking for open files"
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if ! open_files $VAR_DIR; then
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error_exit "Open files exist in $VAR_DIR"
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fi
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log info "Starting backup"
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if ! tar -cf "$SCRATCH/$TAR" -C "$VAR_DIR" world; then
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error_exit "Archive failed"
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fi
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log info "Starting %s" $SERVICE
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if ! start_server $SERVICE; then
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error_exit "Failed to start $SERVICE"
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fi
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log info "Compressing $TAR"
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if ! nice -n "$NICE" xz -9 "$SCRATCH/$TAR"; then
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error_exit "Failed to compress $SCRATCH/$TAR"
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else
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mv "$SCRATCH/$TAR.xz" "$BACKUP_DIR"
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log info "Symlinking current archive"
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ln -nfs "$BACKUP_DIR/$TAR.xz" "$BACKUP_DIR/minecraft-latest.tar.xz"
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fi
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log info "Backup complete"
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}
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main
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