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Aaron D. Lee bb91e41d3d Update default branch from main to 4.1 in Pi docs

Branch 4.1 includes Reed-Solomon error correction for DCT
steganography which is required for reliable operation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-01-04 22:59:32 -05:00

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Stegasoo Pi Image Build Workflow

Quick reference for building a distributable SD card image.

Step 1: Flash Fresh Raspbian

Use rpi-imager with these settings:

OS: Raspberry Pi OS Lite (64-bit)
Hostname: stegasoo
Enable SSH: Yes (password auth)
Username: admin
Password: stegasoo
WiFi: Configure for your network (sanitize script removes it later)

Step 2: Boot & SSH In

# Wait for Pi to boot (~60 seconds), then:
ssh admin@stegasoo.local
# or use IP from router DHCP list

Step 3: Run Setup Script

# Download and run (avoid curl|bash stdin issues)
wget -O setup.sh https://raw.githubusercontent.com/adlee-was-taken/stegasoo/4.1/rpi/setup.sh
chmod +x setup.sh
./setup.sh

This takes ~15-20 minutes and installs:

Python 3.12 via pyenv
jpegio (patched for ARM)
Stegasoo with web UI
Systemd service

Step 4: Test It Works

sudo systemctl start stegasoo
curl -k https://localhost:5000
# Should return HTML

Step 5: Sanitize for Distribution

# Full sanitize (for final image - removes WiFi, shuts down)
sudo ~/stegasoo/rpi/sanitize-for-image.sh

# Or soft reset (for testing - keeps WiFi, reboots)
sudo ~/stegasoo/rpi/sanitize-for-image.sh --soft

This removes:

WiFi credentials (unless --soft)
SSH host keys (regenerate on boot)
SSH authorized keys
Bash history
Stegasoo auth database
Logs and temp files

The script validates all cleanup steps before finishing.

Step 6: Copy the Image

Remove SD card, insert into your Linux machine:

# Find the SD card device (CAREFUL!)
lsblk

# Copy (replace sdX with actual device, e.g., sda)
sudo dd if=/dev/sdX of=stegasoo-rpi-$(date +%Y%m%d).img bs=4M status=progress

Step 7: Shrink & Compress

# Optional: Shrink image (saves space)
wget https://raw.githubusercontent.com/Drewsif/PiShrink/master/pishrink.sh
chmod +x pishrink.sh
sudo ./pishrink.sh stegasoo-rpi-*.img

# Compress (zstd is faster than xz with similar ratio)
zstd -19 -T0 stegasoo-rpi-*.img

Step 8: Distribute

Upload .img.zst to GitHub Releases.

Users can flash with:

# Linux
zstdcat stegasoo-rpi-*.img.zst | sudo dd of=/dev/sdX bs=4M status=progress

# Or use rpi-imager "Use custom" option

Quick Command Summary

# On Pi:
wget -O setup.sh https://raw.githubusercontent.com/adlee-was-taken/stegasoo/4.1/rpi/setup.sh && chmod +x setup.sh && ./setup.sh
sudo systemctl start stegasoo
curl -k https://localhost:5000
sudo ~/stegasoo/rpi/sanitize-for-image.sh

# On your machine:
sudo dd if=/dev/sdX of=stegasoo-rpi-$(date +%Y%m%d).img bs=4M status=progress
zstd -19 -T0 stegasoo-rpi-*.img

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