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Update docs and comments for jpeglib migration (v4.2.0)

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- Replace jpegio references with jpeglib in comments/docstrings
- Update sanitize-for-image.sh to use system Python 3.11+ (no pyenv)
- Update rpi/patches/README.md for jpeglib world
- Add AUR build artifacts to .gitignore

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Aaron D. Lee
2026-01-11 11:19:16 -05:00
parent 67037ae196
commit 1e07630b49
7 changed files with 55 additions and 91 deletions
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5
.gitignore vendored
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@@ -97,3 +97,8 @@ rpi/*.tar.zst.zip
rpi/*.img
rpi/*.img.zst
rpi/*.img.zst.zip
# AUR build artifacts
aur-upload/
aur/.SRCINFO
aur/*.pkg.tar.zst

4
frontends/web/app.py
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@@ -31,7 +31,7 @@ KEY PATTERNS
============
1. SUBPROCESS ISOLATION
Stegasoo's DCT mode uses scipy/jpegio which can crash on malformed input.
Stegasoo's DCT mode uses scipy/jpeglib which can crash on malformed input.
We run encode/decode in subprocesses so crashes don't take down the server:
subprocess_stego = SubprocessStego(timeout=180)
@@ -213,7 +213,7 @@ except ImportError:
#
# This is a critical reliability pattern. Here's the problem:
#
# scipy's DCT and jpegio can crash (segfault) on:
# scipy's DCT and jpeglib can crash (segfault) on:
# - Malformed JPEG files
# - Very large images that exhaust memory
# - Certain edge cases in coefficient manipulation

2
frontends/web/stego_worker.py
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@@ -3,7 +3,7 @@
Stegasoo Subprocess Worker (v4.0.0)
This script runs in a subprocess and handles encode/decode operations.
If it crashes due to jpegio/scipy issues, the parent Flask process survives.
If it crashes due to jpeglib/scipy issues, the parent Flask process survives.
CHANGES in v4.0.0:
- Added channel_key support for encode/decode operations

2
frontends/web/subprocess_stego.py
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@@ -132,7 +132,7 @@ class SubprocessStego:
"""
Subprocess-isolated steganography operations.
All operations run in a separate Python process. If jpegio or scipy
All operations run in a separate Python process. If jpeglib or scipy
crashes, only the subprocess dies - Flask keeps running.
"""

71
rpi/patches/README.md
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@@ -2,56 +2,39 @@
This directory contains patches for dependencies that need modifications to build on ARM64.
## Current Status (v4.2+)
As of Stegasoo 4.2, we use **jpeglib** instead of jpegio. The jpeglib build process is handled inline in `setup.sh` and includes:
- Cloning from GitHub (PyPI tarball missing headers)
- Downloading libjpeg headers for each version (6b through 9f)
- Patching setup.py to skip turbo/mozjpeg (need cmake-generated headers)
See `setup.sh` for the full implementation.
## Legacy: jpegio Patches (v4.1 and earlier)
The `jpegio/` directory contains patches for the old jpegio dependency, which required removing x86-specific `-m64` compiler flags. These are no longer used but kept for reference.
## jpeglib Helper Script
The `jpeglib/install-jpeglib-arm64.sh` script is a standalone version of the jpeglib build process. It's not used by setup.sh (which has the logic inline) but can be useful for manual testing or debugging.
## Structure
```
patches/
<package>/
arm64.patch # Standard unified diff patch file
apply-patch.sh # Script with fallback strategies
jpegio/ # Legacy (v4.1) - not used in v4.2+
arm64.patch
apply-patch.sh
jpeglib/ # Reference script for manual builds
install-jpeglib-arm64.sh
```
## How It Works
## Adding New Patches
The `apply-patch.sh` script tries multiple strategies in order:
1. **Patch file** - Apply the `.patch` file using `patch -p1`
2. **Sed fallback** - Use sed for simple string replacements
3. **Python fallback** - Use regex for flexible pattern matching
This layered approach handles:
- Exact matches (patch file works)
- Minor upstream changes (sed catches variations)
- Significant changes (Python regex is most flexible)
- Already patched files (detected and skipped)
## Adding a New Patch
If a new dependency needs ARM64 patches:
1. Create a directory: `patches/<package>/`
2. Create the patch file: `git diff > arm64.patch`
3. Create `apply-patch.sh` with appropriate fallback logic
4. Update `setup.sh` to call the patch script
## jpegio Patch
The jpegio library includes x86-specific `-m64` compiler flags that fail on ARM64.
The patch removes these flags by replacing:
```python
cargs.append('-m64')
```
with:
```python
pass # ARM64: removed x86-specific -m64 flag
```
## Updating Patches
When upstream changes break a patch:
1. Clone the new version
2. Make the necessary modifications
3. Generate a new patch: `diff -u original modified > arm64.patch`
4. Test on a fresh Pi install
2. Add patch files or helper scripts
3. Update `setup.sh` to apply the patch during installation

58
rpi/sanitize-for-image.sh
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@@ -264,49 +264,25 @@ if [ -n "$STEGASOO_DIR" ] && [ -d "$STEGASOO_DIR/venv" ]; then
echo " Venv broken or stegasoo not installed, rebuilding..."
rm -rf "$STEGASOO_DIR/venv"
# Find Python 3.12 (prefer pyenv, fall back to system)
USER_HOME=$(eval echo "~$STEGASOO_USER")
PYENV_PYTHON="$USER_HOME/.pyenv/versions/3.12*/bin/python"
if compgen -G "$PYENV_PYTHON" > /dev/null 2>&1; then
PYTHON_BIN=$(ls $PYENV_PYTHON 2>/dev/null | head -1)
echo " Using pyenv Python: $PYTHON_BIN"
elif command -v python3.12 &>/dev/null; then
PYTHON_BIN="python3.12"
echo " Using system Python 3.12"
else
PYTHON_BIN="python3"
echo " Warning: Python 3.12 not found, using $($PYTHON_BIN --version)"
fi
sudo -u "$STEGASOO_USER" "$PYTHON_BIN" -m venv "$STEGASOO_DIR/venv"
sudo -u "$STEGASOO_USER" "$STEGASOO_DIR/venv/bin/pip" install --quiet --upgrade pip setuptools wheel
# On ARM64, jpegio needs patching before install
ARCH=$(uname -m)
if [[ "$ARCH" == "aarch64" || "$ARCH" == "arm64" ]]; then
echo " Building jpegio for ARM64 (this may take a minute)..."
# Install build deps
sudo -u "$STEGASOO_USER" "$STEGASOO_DIR/venv/bin/pip" install --quiet cython numpy
JPEGIO_DIR="/tmp/jpegio-build-$$"
rm -rf "$JPEGIO_DIR"
if git clone https://github.com/dwgoon/jpegio.git "$JPEGIO_DIR" 2>/dev/null; then
# Apply patch to remove -m64 flag
if [ -f "$STEGASOO_DIR/rpi/patches/jpegio/apply-patch.sh" ]; then
bash "$STEGASOO_DIR/rpi/patches/jpegio/apply-patch.sh" "$JPEGIO_DIR"
else
sed -i "s/cargs.append('-m64')/pass # ARM64 fix/g" "$JPEGIO_DIR/setup.py"
fi
# Change ownership so user can build
chown -R "$STEGASOO_USER:$STEGASOO_USER" "$JPEGIO_DIR"
sudo -u "$STEGASOO_USER" "$STEGASOO_DIR/venv/bin/pip" install "$JPEGIO_DIR"
rm -rf "$JPEGIO_DIR"
else
echo " Warning: Failed to clone jpegio, DCT mode may not work"
# Find system Python 3.11+ (no pyenv needed)
PYTHON_BIN=""
for py in python3.14 python3.13 python3.12 python3.11 python3; do
if command -v "$py" &>/dev/null; then
PYTHON_BIN=$(command -v "$py")
break
fi
fi
done
sudo -u "$STEGASOO_USER" "$STEGASOO_DIR/venv/bin/pip" install --quiet -e "$STEGASOO_DIR[web]"
echo " Venv rebuilt and stegasoo installed"
if [ -z "$PYTHON_BIN" ]; then
echo " Error: Python 3.11+ not found"
VALIDATION_ERRORS=$((VALIDATION_ERRORS + 1))
else
echo " Using: $PYTHON_BIN ($($PYTHON_BIN --version 2>&1))"
sudo -u "$STEGASOO_USER" "$PYTHON_BIN" -m venv "$STEGASOO_DIR/venv"
sudo -u "$STEGASOO_USER" "$STEGASOO_DIR/venv/bin/pip" install --quiet --upgrade pip setuptools wheel
sudo -u "$STEGASOO_USER" "$STEGASOO_DIR/venv/bin/pip" install --quiet -e "$STEGASOO_DIR[web]"
echo " Venv rebuilt and stegasoo installed"
fi
else
echo " Venv OK"
fi

4
src/stegasoo/steganography.py
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@@ -156,7 +156,7 @@ def has_dct_support() -> bool:
dct_mod = _get_dct_module()
return dct_mod.has_dct_support()
except (ImportError, ValueError):
# ValueError: numpy binary incompatibility (e.g., jpegio built against numpy 2.x)
# ValueError: numpy binary incompatibility (e.g., jpeglib built against numpy 2.x)
return False
@@ -1097,7 +1097,7 @@ def peek_image(image_data: bytes) -> dict:
except Exception:
pass
# Try DCT extraction (requires scipy/jpegio)
# Try DCT extraction (requires scipy/jpeglib)
try:
from .dct_steganography import HAS_JPEGIO, HAS_SCIPY