# Corporate Network Deployment Guide (Air-Gap)

**Document ID:** DEPLOY-CORP-001-REV2  
**Date:** 2026-03-01  
**Build Name:** UT (Universität/Projekt)  
**Target:** TQMa6UL on MBa6ULx  
**Environment:** Air-gapped corporate network  

---

## Overview

This guide describes deployment of the UT Yocto mirror in an air-gapped corporate network. The corporate system has no internet access and requires complete offline build capability.

**Prerequisites:**
- Software approval documentation received
- UT-mirror-package.tar.gz transferred securely
- Checksum verified
- Ubuntu 22.04 system ready (can use local Ubuntu mirror for apt)

---

## Pre-Deployment Checklist

- [ ] Software approval granted
- [ ] Mirror archive transferred to corporate network
- [ ] SHA256 checksum verified: `sha256sum -c *.sha256`
- [ ] Sufficient disk space (200GB+)
- [ ] Ubuntu 22.04 installed (can use local apt mirror)
- [ ] User has sudo privileges
- [ ] Target directory `/opt/UT-yocto` approved by IT

---

## Step 1: Extract Mirror Archive

```bash
# Create base directory
export UT_BASE=/opt/UT-yocto
sudo mkdir -p ${UT_BASE}
sudo chown $(whoami):$(whoami) ${UT_BASE}

# Extract mirror archive
cd ${UT_BASE}
tar xzf /path/to/transfer/UT-tqma6ul-yocto-scarthgap-*.tar.gz

# Verify structure
ls -la UT-mirror-package/
# Should show: sources/, premirror/, downloads/, licenses/, configs/
```

---

## Step 2: Install Build Dependencies

From corporate Ubuntu mirror (or pre-approved packages):

```bash
sudo apt update
sudo apt install -y \
    git python3 jq bash grep gawk wget diffstat \
    chrpath cpio texinfo gcc g++ make file tar \
    bzip2 gzip xz-utils zstd lz4 patch perl \
    python3-pexpect socat unzip rsync bc \
    libsdl1.2-dev xterm

# Locale setup
sudo locale-gen en_US.UTF-8
sudo update-locale LC_ALL=en_US.UTF-8 LANG=en_US.UTF-8
export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8
```

---

## Step 3: Setup Mirror Directories

```bash
# Create system mirror directories
sudo mkdir -p /srv/yocto/{premirror,downloads,sstate-cache}
sudo chown -R $(whoami):$(whoami) /srv/yocto

# Copy mirror contents
cd ${UT_BASE}/UT-mirror-package

# Copy premirror (git repos and tarballs)
cp -r premirror/* /srv/yocto/premirror/

# Copy downloads
cp -r downloads/* /srv/yocto/downloads/

# SState cache (optional, speeds up rebuilds)
cp -r sstate-cache/* /srv/yocto/sstate-cache/ 2>/dev/null || true
```

---

## Step 4: Configure Site Configuration

Create `~/.yocto/site.conf` for air-gap:

```bash
mkdir -p ~/.yocto

cat > ~/.yocto/site.conf <<'EOF'
# UT Project - Air-Gap Configuration
# Build: UT
# Target: TQMa6UL
# Date: 2026-03-01

# Mirror directories (local filesystem)
DL_DIR = "/srv/yocto/downloads"
SSTATE_DIR = "/srv/yocto/sstate-cache"

# Air-gap settings
BB_NO_NETWORK = "1"
BB_FETCH_PREMIRRORONLY = "1"

# Premirror configuration (local files only)
SOURCE_MIRROR_URL = "file:///srv/yocto/premirror/"
INHERIT += "own-mirrors"

PREMIRRORS:prepend = " \
    git://.*/.* file:///srv/yocto/premirror/ \n \
    ftp://.*/.* file:///srv/yocto/premirror/ \n \
    http://.*/.* file:///srv/yocto/premirror/ \n \
    https://.*/.* file:///srv/yocto/premirror/ \n \
"

# Parallelism (adjust to hardware)
BB_NUMBER_THREADS ?= "8"
PARALLEL_MAKE ?= "-j8"

# License compliance
COPY_LIC_MANIFEST = "1"
COPY_LIC_DIRS = "1"
INHERIT += "archiver"
ARCHIVER_MODE[src] = "original"
EOF
```

---

## Step 5: Initialize Build Environment

```bash
cd ${UT_BASE}/UT-mirror-package/sources/ci-meta-tq

# Verify submodules are present
ls -la sources/

# Set machine for TQMa6UL
export ACCEPT_FSL_EULA=1
export MACHINE=tqma6ul-multi-mba6ulx

# Initialize build (creates build_ut)
. ./setup-environment build_ut mainline

# Verify configuration
bitbake -e | grep "^MACHINE="
# Should show: MACHINE="tqma6ul-multi-mba6ulx"
```

---

## Step 6: Verify Air-Gap Build

### 6.1 Test Offline Build

```bash
# Ensure we're in build environment
cd ${UT_BASE}/UT-mirror-package/sources/ci-meta-tq
export ACCEPT_FSL_EULA=1
export MACHINE=tqma6ul-multi-mba6ulx
. ./setup-environment build_ut mainline

# Verify no network access is attempted
export BB_NO_NETWORK=1

# Start build (should complete without network)
bitbake tq-image-small-debug
```

**Expected:** Build completes using only local premirror sources.

### 6.2 Verify 2038 Compliance

```bash
# Check time_t size
echo '#include <time.h>' | \
    ${WORKDIR}/recipe-sysroot-native/usr/bin/arm-poky-linux-gnueabi-gcc -x c - -dM -E | \
    grep TIME_BITS
# Expected: #define __TIME_BITS 64

# Check kernel config
bitbake -e virtual/kernel | grep CONFIG_COMPAT_32BIT_TIME
# Expected: CONFIG_COMPAT_32BIT_TIME=y
```

---

## Step 7: Development Workflow

### Daily Build Commands

```bash
# Enter build environment
cd ${UT_BASE}/UT-mirror-package/sources/ci-meta-tq
export ACCEPT_FSL_EULA=1
export MACHINE=tqma6ul-multi-mba6ulx
. ./setup-environment build_ut mainline

# Build target image
bitbake tq-image-small-debug

# Deploy to target (SD card)
# See TQ documentation for deployment methods
```

### SDK Generation (for Application Development)

```bash
# Generate SDK for application developers
bitbake tq-image-small-debug -c populate_sdk

# Install SDK
${UT_BASE}/UT-mirror-package/sources/ci-meta-tq/build_ut/tmp/deploy/sdk/*.sh

# Source SDK in new terminal
source /opt/poky/.../environment-setup-arm-poky-linux-gnueabi
```

---

## Build Verification Checklist

- [ ] Air-gap build completes without network errors
- [ ] Image boots on TQMa6UL hardware
- [ ] 2038 compliance verified (64-bit time_t)
- [ ] License manifest generated
- [ ] All proprietary components reviewed
- [ ] SDK functional for application development

---

## Troubleshooting

### Issue: "Failed to fetch" errors

**Cause:** BitBake trying to access network

**Solution:**
```bash
# Verify settings
grep BB_NO_NETWORK ~/.yocto/site.conf
grep SOURCE_MIRROR_URL ~/.yocto/site.conf

# Should show:
# BB_NO_NETWORK = "1"
# SOURCE_MIRROR_URL = "file:///srv/yocto/premirror/"
```

### Issue: Missing files in premirror

**Cause:** Incomplete transfer

**Solution:**
```bash
# Re-verify checksum on source system
# Re-transfer missing files
```

### Issue: Permission denied

**Solution:**
```bash
sudo chown -R $(whoami):$(whoami) /opt/UT-yocto /srv/yocto
```

---

## Security & Compliance

1. **No Network Access:** Build verified to complete offline
2. **Source Audit:** All sources archived and traceable
3. **License Compliance:** License manifest generated per build
4. **User Permissions:** Build as regular user, not root

---

## Support & Documentation

- **TQ BSP Documentation:** Included in `sources/meta-tq/`
- **Yocto Manuals:** Included in `sources/poky/documentation/`
- **License Info:** `build_ut/tmp/deploy/licenses/`

---

**Document Version:** 2.0  
**Author:** Siggi ⚙️  
**Build:** UT  
**Last Updated:** 2026-03-01