version: 1
id: linux-filesystems
title: Filesystem Discovery
summary: Find large files and document disk usage patterns before a node runs out of space.
difficulty: beginner
estimatedMinutes: 20
prerequisites: [linux-pipelines]
image: alpine:3.21
shell: /bin/sh
setup:
  - "mkdir -p /workspace/data/cache /workspace/data/archive"
  - "dd if=/dev/zero of=/workspace/data/cache/temp.bin bs=1M count=5 2>/dev/null"
  - "dd if=/dev/zero of=/workspace/data/archive/backup.bin bs=1M count=2 2>/dev/null"
  - "printf 'small\n' > /workspace/data/readme.txt"
tasks:
  - id: disk-audit
    title: Audit workspace usage
    description: Create /workspace/disk-audit.txt listing the total size of /workspace/data in human-readable form using du, and list files larger than 1M under /workspace/data in /workspace/large-files.txt.
    hints:
      - du -sh summarizes directory size.
      - find supports -size +1M.
    checks:
      - type: file
        name: Disk audit exists
        path: /workspace/disk-audit.txt
      - type: command
        name: Audit mentions data directory
        command: grep -q data /workspace/disk-audit.txt
      - type: file
        name: Large files list exists
        path: /workspace/large-files.txt
        value: temp.bin
limits: {cpus: "0.5", memory: 128m, pids: 64, timeout: 1800, network: false}