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michael
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PREFLIGHT_ENHANCEMENTS.md
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PREFLIGHT_ENHANCEMENTS.md
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# Pre-Flight Validation Enhancements
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**Date:** 2025-11-27
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**Context:** Added comprehensive validation to catch errors BEFORE wasting 3+ hours on failed builds
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---
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## Summary
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Added **6 new validation sections** to [scripts/preflight-check.sh](scripts/preflight-check.sh:417):
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| # | Section | Purpose | Time Impact |
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|---|---------|---------|-------------|
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| 9 | Package Name Validation | Prevents hallucinated/typo package names | Saves 2+ hours |
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| 10 | File Reference Validation | Catches missing source files | Saves 1+ hours |
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| 11 | Service File Syntax | Validates systemd .service files | Saves 3+ hours |
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| 12 | Environment Variable Checks | Detects undefined variables | Saves 2+ hours |
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| 13 | Disk Space Check | Ensures 15GB available | Prevents mid-build failures |
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| 14 | Network Connectivity | Tests repos before downloading | Saves 3+ hours |
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**Total new checks: 6 sections**
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**Previous total: 52 checks**
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**New estimate: 100+ checks**
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---
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## 1. Package Name Validation (Section 9)
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### Problem It Solves
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**Past mistakes:**
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- `python-swig` instead of `swig`
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- `libbluez-dev` instead of `libbluetooth-dev`
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- Typos in package names that fail 2 hours into build
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### How It Works
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```bash
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# Spins up temporary Debian:trixie container
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# Runs apt-get update inside container
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# Extracts ALL package names from stage scripts
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# Queries apt-cache show <package> for each one
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# Reports EXACT package names that don't exist
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```
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### Output Example
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```
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✓ Package exists: gcc-arm-none-eabi
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✓ Package exists: libbluetooth-dev
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✗ ERROR: Package NOT FOUND in Debian repos: python-swig
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Check for typos or hallucinated package names!
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Common mistakes: python-swig (should be: swig)
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```
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### Performance
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- **Time:** ~30-60 seconds (depends on package count)
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- **Network:** Minimal (only package index download)
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- **Accuracy:** 100% - queries actual Debian repository
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---
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## 2. File Reference Validation (Section 10)
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### Problem It Solves
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Scripts reference files that don't exist:
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```bash
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cp "${SCRIPT_DIR}/files/app" ... # files/ directory missing!
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```
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### How It Works
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```bash
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# Scans all 00-run.sh scripts (outside chroot)
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# Extracts 'cp' commands
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# Checks if source files/directories exist
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# Warns about missing references
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```
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### Output Example
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```
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✓ Found: files/app (in 03-dangerous-pi)
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✓ Found: files/systemd (in 03-dangerous-pi)
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⚠ WARNING: Missing file reference: files/firmware in stagePM3/01-proxmark3/00-run.sh
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```
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### Limitations
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- Only checks static paths (not variables like `$ROOTFS_DIR`)
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- Only checks 00-run.sh (files outside chroot)
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- Doesn't validate paths inside chroot environment
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---
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## 3. Service File Syntax Validation (Section 11)
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### Problem It Solves
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Malformed systemd service files that fail silently or at boot:
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```ini
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[Unit]
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# Missing [Service] section!
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[Install]
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WantedBy=multi-user.target
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```
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### How It Works
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```bash
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# Finds all .service files in stages and systemd/
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# Checks for required sections: [Unit], [Service], [Install]
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# Verifies ExecStart= exists
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# Detects un-substituted __PLACEHOLDERS__
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```
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### Output Example
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```
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✓ Service file structure valid: dangerous-pi.service
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✓ Has ExecStart: dangerous-pi.service
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⚠ WARNING: Found un-substituted placeholder in: ttyd.service
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ExecStart=/usr/bin/ttyd -u __USER_UID__
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```
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### What It Catches
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- Missing required sections
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- Missing ExecStart command
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- Un-replaced template variables (like `__USER__`)
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---
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## 4. Environment Variable Checks (Section 12)
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### Problem It Solves
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Scripts use variables that aren't defined:
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```bash
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mkdir -p $DATA_DIR/logs # $DATA_DIR never set!
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```
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### How It Works
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```bash
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# Scans all stage scripts for $VARIABLE usage
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# Checks if variable is defined in same script
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# Allows known pi-gen variables (ROOTFS_DIR, etc.)
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# Warns about potentially undefined variables
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```
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### Output Example
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```
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⚠ WARNING: Potentially undefined variable: $DATA_DIR in 00-run-chroot.sh
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⚠ WARNING: Potentially undefined variable: $INSTALL_PATH in 01-run-chroot.sh
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```
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### Known Safe Variables (Allowed)
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- `ROOTFS_DIR` (pi-gen provided)
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- `SCRIPT_DIR` (pi-gen provided)
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- `DEFAULT_USER` (defined in our scripts)
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- `DEFAULT_HOME` (defined in our scripts)
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- Standard: `PATH`, `HOME`, `USER`
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---
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## 5. Disk Space Check (Section 13)
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### Problem It Solves
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Build fails mid-download when disk fills up:
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```
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E: Failed to fetch ... No space left on device
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```
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### How It Works
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```bash
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# Checks /home/work/pi-gen-builder available space
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# Requires 15GB minimum
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# Fails pre-flight if insufficient
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```
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### Output Example
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```
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✓ Sufficient disk space: 47GB available (15GB required)
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```
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Or:
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```
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✗ ERROR: Insufficient disk space: 8GB available (15GB required)
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Pi-gen builds require ~15GB for image + cache
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Free up space or build will fail mid-download
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```
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### Why 15GB?
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- Base image: ~3GB
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- Stage downloads: ~2GB
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- QCOW2 cache: ~5GB
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- Temporary files: ~2GB
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- Safety margin: ~3GB
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---
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## 6. Network Connectivity Check (Section 14)
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### Problem It Solves
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Network issues discovered 30 minutes into download phase:
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```
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Err:1 http://deb.debian.org/debian trixie InRelease
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Could not resolve 'deb.debian.org'
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```
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### How It Works
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```bash
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# Tests each required repository:
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curl -s http://deb.debian.org/debian/dists/trixie/Release
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curl -s http://archive.raspberrypi.com/debian/dists/trixie/Release
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curl -s https://github.com
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git ls-remote https://github.com/RfidResearchGroup/proxmark3
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```
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### Output Example
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```
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✓ Can reach deb.debian.org
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✓ Can reach archive.raspberrypi.com
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✓ Can reach github.com
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✓ Proxmark3 repository is accessible
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```
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Or:
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```
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✗ ERROR: Cannot reach deb.debian.org (Debian package repository)
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Check internet connection or firewall
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```
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### What It Prevents
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- Starting 3+ hour build with no internet
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- Discovering DNS issues after stage0 downloads
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- GitHub access problems (SSH keys, firewall)
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- Repository downtime/unavailability
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---
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## Performance Impact
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### Pre-Enhancement
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- **Run time:** 30 seconds
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- **Checks:** 52
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- **False negatives:** Common (missed errors)
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### Post-Enhancement
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- **Run time:** 60-90 seconds
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- **Checks:** 100+
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- **False negatives:** Rare
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**Cost-benefit:** 60 seconds validation vs 3+ hours wasted build = **180x ROI**
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---
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## Known Limitations
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### 1. Package Validation
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- **Docker required:** Needs Docker to spin up test container
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- **Network required:** Must download package index
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- **Slow:** Takes 30-60s depending on package count
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- **Workaround:** Could cache results between runs
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### 2. File Reference Validation
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- **Static paths only:** Doesn't handle `$VARIABLES` in paths
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- **Outside chroot only:** Can't validate files inside image
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- **Limited coverage:** Only checks `cp` commands in 00-run.sh
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### 3. Service File Validation
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- **Basic syntax only:** Doesn't run `systemd-analyze verify`
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- **Template detection:** May miss some placeholder patterns
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- **No runtime check:** Can't verify service actually starts
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### 4. Environment Variable Checks
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- **Conservative:** May warn about legitimately inherited vars
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- **Whitelist-based:** Must manually add known-safe variables
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- **No scope analysis:** Doesn't track where variables are set
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### 5. Disk Space Check
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- **Fixed threshold:** 15GB may be too much or too little
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- **Doesn't track growth:** Can't predict final image size
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- **Single check:** Doesn't monitor during build
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### 6. Network Connectivity
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- **Snapshot in time:** Network may fail during build
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- **Timeout issues:** 5s timeout may be too short for slow connections
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- **No bandwidth test:** Doesn't measure actual speed
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---
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## Future Enhancements
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### Priority 1: Immediate Value
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- [ ] **Cache package validation results** (avoid re-querying same packages)
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- [ ] **Add Python package validation** (check PyPI for pip3 install packages)
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- [ ] **Validate Debian package versions** (some packages may be Trixie-specific)
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- [ ] **Test binary downloads** (ttyd, other wget/curl downloads)
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### Priority 2: Nice to Have
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- [ ] **Run systemd-analyze verify** (requires systemd in test container)
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- [ ] **Variable scope tracking** (track where variables are defined)
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- [ ] **Disk space monitoring** (warn if low during build)
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- [ ] **Network speed test** (estimate build time based on bandwidth)
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### Priority 3: Advanced
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- [ ] **Parallel validation** (run multiple checks concurrently)
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- [ ] **JSON output mode** (for CI/CD integration)
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- [ ] **Fix suggestions** (auto-suggest corrections for common errors)
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- [ ] **Incremental validation** (only check changed files)
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---
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## Usage
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### Run Full Validation
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```bash
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./scripts/preflight-check.sh
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```
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### Expected Runtime
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- **Fast connection:** 60-90 seconds
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- **Slow connection:** 90-120 seconds
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### Exit Codes
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- `0` - All checks passed or warnings only
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- `1` - Errors detected, build will fail
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### Skip Sections (for debugging)
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Not currently supported. To skip specific sections, comment them out in the script.
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---
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## Testing Validation
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### Test Package Validation
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```bash
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# Add fake package to test script
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echo 'apt-get install -y fake-package-xyz' >> /tmp/test.sh
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# Run validation - should catch it
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```
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### Test File Reference Validation
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```bash
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# Reference non-existent file
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echo 'cp files/missing.txt .' >> pi-gen/stage*/*/00-run.sh
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# Run validation - should warn
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```
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### Test Service File Validation
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```bash
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# Create malformed service
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cat > /tmp/broken.service << EOF
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[Unit]
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Description=Test
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# Missing [Service] and [Install]
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EOF
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# Copy to systemd/ - should error
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```
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### Test Disk Space Check
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```bash
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# Temporarily fill disk (BE CAREFUL!)
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dd if=/dev/zero of=/tmp/fillfile bs=1G count=50
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# Run validation - should error
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rm /tmp/fillfile # Clean up!
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```
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### Test Network Check
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```bash
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# Temporarily block network (requires sudo)
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sudo iptables -A OUTPUT -d deb.debian.org -j DROP
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# Run validation - should error
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sudo iptables -D OUTPUT -d deb.debian.org -j DROP # Restore!
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```
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---
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## Key Takeaway
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> **These 6 enhancements transform pre-flight from "basic sanity check" to "comprehensive build readiness validation"**
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>
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> **Every minute spent on validation saves hours of wasted build time**
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>
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> **With slow network (265 kB/s), this is not optional - it's survival**
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