MeTube 安装教程：VPS 装好就能下视频

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cat > /opt/metube/cleanup.sh <<'EOF'
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#!/usr/bin/env bash
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# MeTube 自动清理：每 4 小时删一个最旧视频；磁盘占用过高时批量删最旧视频。
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set -euo pipefail
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DOWNLOADS_DIR="${DOWNLOADS_DIR:-/opt/metube/downloads}"
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STATE_DIR="$DOWNLOADS_DIR/.metube"
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LOG_FILE="${LOG_FILE:-/var/log/metube-cleanup.log}"
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DISK_THRESHOLD="${DISK_THRESHOLD:-85}"
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DISK_TARGET="${DISK_TARGET:-75}"
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MAX_DELETE="${MAX_DELETE:-20}"
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MODE="${1:-oldest}"
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DRY_RUN="${DRY_RUN:-0}"
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mkdir -p "$(dirname "$LOG_FILE")"
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exec 9>"/run/metube-cleanup.lock"
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flock -n 9 || exit 0
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log() {
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    printf '%s [%s] %s\n' "$(date '+%F %T')" "$MODE" "$*" >>"$LOG_FILE"
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}
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if [ ! -d "$DOWNLOADS_DIR" ]; then
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    log "downloads directory missing: $DOWNLOADS_DIR"
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    exit 1
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fi
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disk_usage() {
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    df --output=pcent "$DOWNLOADS_DIR" | tail -n 1 | tr -dc '0-9'
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}
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list_oldest() {
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    find "$DOWNLOADS_DIR" -type f -mmin +2 \
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        ! -path "$STATE_DIR/*" \
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        ! -name '*.part' ! -name '*.ytdl' ! -name '*.temp' \
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        \( -iname '*.mp4' -o -iname '*.mkv' -o -iname '*.webm' \
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        -o -iname '*.mov' -o -iname '*.avi' -o -iname '*.flv' \
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        -o -iname '*.ts' -o -iname '*.m4v' -o -iname '*.3gp' \
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        -o -iname '*.mp3' -o -iname '*.m4a' -o -iname '*.opus' \
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        -o -iname '*.ogg' -o -iname '*.flac' -o -iname '*.wav' \
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        -o -iname '*.aac' \) \
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        -printf '%T@ %p\n' 2>/dev/null | sort -n | cut -d' ' -f2-
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}
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delete_video() {
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    local file="$1" base="$1" size
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    base="${file%.*}"
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    size=$(du -h "$file" | cut -f1)
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    if [ "$DRY_RUN" = "1" ]; then
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        log "dry-run: would remove $file ($size)"
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        return 0
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    fi
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    rm -f -- "$file"
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    log "removed $file ($size)"
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    local ext
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    for ext in info.json description jpg jpeg png webp vtt srt ass lrc; do
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        if [ -f "$base.$ext" ]; then
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            rm -f -- "$base.$ext"
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        fi
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    done
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    find "$DOWNLOADS_DIR" -mindepth 1 -type d -empty ! -path "$STATE_DIR*" -delete 2>/dev/null || true
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}
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case "$MODE" in
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    oldest)
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        file=$(list_oldest | awk 'NR==1')
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        if [ -z "$file" ]; then
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            log "no video files, nothing to do"
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            exit 0
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        fi
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        delete_video "$file"
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        log "4h cleanup finished"
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        ;;
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    disk)
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        usage=$(disk_usage)
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        log "disk check: ${usage}% used (threshold ${DISK_THRESHOLD}%)"
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        if [ "$usage" -lt "$DISK_THRESHOLD" ]; then
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            exit 0
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        fi
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        count=0
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        while [ "$usage" -ge "$DISK_TARGET" ] && [ "$count" -lt "$MAX_DELETE" ]; do
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            file=$(list_oldest | awk 'NR==1')
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            if [ -z "$file" ]; then
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                log "no deletable video left"
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                break
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            fi
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            delete_video "$file"
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            count=$((count + 1))
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            usage=$(disk_usage)
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        done
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        log "disk cleanup finished: ${usage}% used, removed ${count} file(s)"
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        ;;
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    *)
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        echo "usage: $0 [oldest|disk]" >&2
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        exit 2
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        ;;
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esac
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EOF