mcp_backfill.sh

#!/usr/bin/env bash
set -euo pipefail

BASE="/home/mcp/logs"
START_DATE="20260401"

# 7 GB reserve margin, in MiB
RESERVE_MB=7168

# File you supply for duplication
TMPFILE="/path/to/source/file.csv"

# Output filename inside each dated log folder
OUTFILE="file.csv"

if [[ ! -f "$TMPFILE" ]]; then
    echo "Missing TMPFILE: $TMPFILE"
    exit 1
fi

current="$START_DATE"

while true; do
    current=$(date -d "${current} -1 day" +%Y%m%d)

    year=$(date -d "$current" +%Y)
    month=$(date -d "$current" +%-m)
    day=$(date -d "$current" +%-d)

    dir="$BASE/$year/$month/$day"
    mkdir -p "$dir"

    free_kb=$(df --output=avail "$BASE" | tail -n 1)
    free_mb=$((free_kb / 1024))

    usable_mb=$((free_mb - RESERVE_MB))
    if (( usable_mb <= 0 )); then
        echo "Stopping: reserve margin reached. Free=${free_mb}MB Reserve=${RESERVE_MB}MB"
        break
    fi

    outfile="$dir/$OUTFILE"

    echo "Writing $outfile"
    cp "$TMPFILE" "$outfile"
done

echo "Done."