arch-wsl-cleanup

name	arch-wsl-cleanup
description	Free up disk space on Arch Linux WSL through layered cleanup: cache purge, orphan removal, package audit, and large file scanning. Use whenever the user mentions disk space, cleanup, storage, package review, or wants to shrink their WSL footprint — even if they just say "空间不够", "磁盘满了", "WSL 太大了", or "clean up my system". Prefer this skill over ad-hoc cleanup commands on Arch WSL.
metadata	{"internal":true}

Arch WSL Disk Cleanup

Guide systematic disk space cleanup on Arch Linux WSL systems. Follow a layered approach: start with safe cache cleanup, then review installed packages, then scan for large files and directories.

Pre-flight Checks

1. Confirm the environment is Arch Linux: head -3 /etc/os-release
2. Check if running in WSL: grep -qi microsoft /proc/version
3. Check current disk usage: df -h /
4. Identify available package managers: which pacman yay paru 2>/dev/null

Record baseline for the final report — save the output of df -h / and:

du -sh /var/cache/pacman/pkg/ ~/.cache/ 2>/dev/null

Phase 1: Safe Cleanup (zero risk, execute directly)

Only delete caches and orphaned packages — no installed software is affected.

1.1 Package manager caches

# pacman package cache (keep current installed versions)
sudo pacman -Sc --noconfirm

# AUR build cache — use whichever helper is installed
yay -Sc --noconfirm 2>/dev/null || paru -Sc --noconfirm 2>/dev/null

# For aggressive cleanup (clear ALL cache including current versions):
# sudo pacman -Scc --noconfirm

1.2 Orphaned dependencies

# List orphans (no package depends on them)
pacman -Qdtq

# Remove them (guard against empty list)
orphans=$(pacman -Qdtq)
[ -n "$orphans" ] && sudo pacman -Rns --noconfirm $orphans || echo "无孤儿包"

1.3 Language package manager caches

Run whichever tools the user has installed:

# Python - uv
uv cache clean

# Python - pip
pip cache purge

# Node.js - npm
npm cache clean --force

# Node.js - bun
bun pm cache rm 2>/dev/null || rm -rf ~/.bun/install/cache/

# Rust - cargo
cargo cache --cleanup
# Or directly: rm -rf ~/.cargo/registry/cache ~/.cargo/registry/index

1.4 System logs

# Compress journalctl to 50M
sudo journalctl --vacuum-size=50M

# Delete old rotated logs
sudo find /var/log -type f \( -name "*.gz" -o -name "*.[0-9]" -o -name "*.old" \) -delete

Phase 2: Package Review (requires user confirmation)

2.1 Package statistics

echo "总包数: $(pacman -Qq | wc -l)"
echo "手动安装: $(pacman -Qe | wc -l)"
echo "AUR/外来包: $(pacman -Qm | wc -l)"

# Total installed size (script path is relative to this skill directory)
uv run --script scripts/calc_package_size.py

2.2 List manually installed packages

LC_ALL=C pacman -Qei | awk '
  /^Name/{name=$3}
  /^Installed Size/{
    val=$4; unit=$5
    if (unit=="GiB") mib=val*1024
    else if (unit=="KiB") mib=val/1024
    else mib=val
    printf "%.0f MiB | %s\n", mib, name
  }
' | sort -t'|' -k1 -rn

Present results as a sorted table. Never auto-delete packages — always ask the user to confirm which ones to remove.

Phase 3: Full Disk Scan

3.1 Top-level directory scan

# Use -x to stay on the current filesystem (critical on WSL!)
du -hx --max-depth=1 / 2>/dev/null | sort -rh | head -20

Critical: Always use du -x — without it, WSL will traverse mounted Windows partitions (/mnt/c, etc.) and report inflated sizes.

3.2 User directory deep scan

# Largest directories under $HOME
du -hx --max-depth=2 "$HOME" 2>/dev/null | sort -rh | head -30

# Recurse into common subdirectories (skip if they don't exist)
for dir in "$HOME/.cache" "$HOME/code" "$HOME/github"; do
  [ -d "$dir" ] && du -hx --max-depth=2 "$dir" 2>/dev/null | sort -rh | head -15
done

3.3 Large file search

# System-wide files larger than 50MB
find /usr /opt /var -type f -size +50M -exec du -sh {} + 2>/dev/null | sort -rh | head -20

Phase 4: Targeted Cleanup

Safe to delete directly

Pattern	Examples
~/.cache/<tool>/	Playwright, camoufox, huggingface, go-build, jedi, node-gyp, telemetry caches
**/build/	Compilation output directories
**/node_modules/	Reinstallable via package manager
**/.venv/	Rebuildable with uv/venv

Require user confirmation

• Manually installed packages from Phase 2
• ~/service/, ~/software/, or similar user-stored directories
• Project code directories
• AI tool data directories (e.g., .genericagent/)

Use commands for specific targets

# Go caches
go clean -cache -modcache

# Direct directory deletion
rm -rf <target-directory>

Phase 5: WSL VHDX Compaction (manual — guide the user)

After cleanup inside WSL, the virtual disk file (ext4.vhdx) on Windows does not shrink automatically. The user must perform these steps manually outside WSL.

Walk the user through:

1. TRIM the filesystem (run inside WSL):

   sudo fstrim -v /
   

2. Shut down WSL (run in Windows PowerShell):

   wsl --shutdown
   

3. Compact the VHDX — choose one method (run in Windows PowerShell as Administrator):

Option A: diskpart

diskpart
# In diskpart:
select vdisk file="C:\Users\<username>\AppData\Local\Packages\...\LocalState\ext4.vhdx"
compact vdisk
exit

Option B: Hyper-V PowerShell cmdlet

Optimize-VHD -Path "C:\Users\<username>\AppData\Local\Packages\...\LocalState\ext4.vhdx" -Mode Full

The exact VHDX path depends on the WSL distribution — help the user locate it.

Post-cleanup Verification

# Check disk usage again
df -h /

# Show remaining cache sizes
du -sh /var/cache/pacman/pkg/ ~/.cache/yay/ 2>/dev/null

Reporting Format

Report results to the user as a table (use the baseline recorded in Pre-flight):

Item	Before	After	Freed
pacman cache	X GiB	Y GiB	Z GiB

End with a total freed amount summary.

Safety Rules

1. Never auto-delete packages — always require user confirmation
2. Never touch /mnt/ — those are Windows partitions
3. Always use du -x — prevents counting mounted filesystems
4. rm -rf path blacklist — never rm -rf system directories: /, /home, /etc, /usr, /var, /boot, /opt, /srv, /root. Only delete their subdirectories (e.g. ~/.cache/playwright).
5. Handle permissions — some operations need sudo, some (like bun cache) may need rm -rf instead of CLI commands