bootstrap: support USB/local-copy and private repo PAT

Three usage modes now documented and implemented:

1. Public repo: curl | sudo bash (unchanged)
2. Private repo, USB: copy whole repo to thumb drive, run bootstrap.sh
   from it — detects setup.sh alongside itself, copies to ~/ubuntu-post-install,
   execs setup.sh. No git auth, no internet needed for the scripts.
3. Private repo, PAT: bootstrap.sh --pat ghp_xxx — PAT stripped from
   stored remote URL after clone so it is not saved in plain text.

USB mode is the recommended approach for private repos: clone once,
put on a drive, run on every new machine.

https://claude.ai/code/session_01Y4dMKtkqkpvmgDKoRdzhTG

bootstrap.sh

@@ -1,23 +1,39 @@
 #!/bin/bash
 # bootstrap.sh — get and run ubuntu-post-install on a fresh system.
 #
-# One command to paste into a new Ubuntu box:
-#   curl -fsSL https://raw.githubusercontent.com/outis1one/ubuntu-post-install/main/bootstrap.sh | sudo bash
+# THREE ways to use this:
 #
-# What it does:
-#   1. Installs git if missing (the only hard dependency)
-#   2. Clones (or updates) the repo to ~/ubuntu-post-install
-#   3. Launches the interactive setup wizard
+#  1. Public repo — paste on any new box (internet required):
+#       curl -fsSL https://raw.githubusercontent.com/outis1one/ubuntu-post-install/main/bootstrap.sh | sudo bash
+#
+#  2. Private repo — copy just this file, supply a fine-grained read-only PAT:
+#       sudo bash bootstrap.sh --pat ghp_xxxxxxxxxxxxxxxxxxxx
+#
+#  3. USB / offline — copy the WHOLE REPO to a thumb drive, run from there
+#     (no auth, no internet needed for the scripts themselves):
+#       sudo bash /media/user/DRIVE/ubuntu-post-install/bootstrap.sh
+#
+# Option 3 is the recommended approach for private repos: clone once on a
+# connected machine, put the directory on a USB drive, done.
 set -euo pipefail
 
 REPO_URL="https://github.com/outis1one/ubuntu-post-install.git"
-DEST="${HOME:-/root}/ubuntu-post-install"
 
 # Resolve actual user home when running under sudo
+ACTUAL_HOME="${HOME:-/root}"
 if [ -n "${SUDO_USER:-}" ]; then
     ACTUAL_HOME="$(getent passwd "$SUDO_USER" | cut -d: -f6)"
-    DEST="$ACTUAL_HOME/ubuntu-post-install"
 fi
+DEST="$ACTUAL_HOME/ubuntu-post-install"
+
+# Parse --pat flag
+PAT=""
+for arg in "$@"; do
+    case "$arg" in
+        --pat) shift; PAT="${1:-}" ;;
+        --pat=*) PAT="${arg#--pat=}" ;;
+    esac
+done
 
 echo ""
 echo "╔══════════════════════════════════════════════════════════════╗"
@@ -25,23 +41,49 @@ echo "║  ubuntu-post-install  ·  bootstrap                          ║"
 echo "╚══════════════════════════════════════════════════════════════╝"
 echo ""
 
-# 1) Ensure git is available
+# ── Option 3: already running from inside the repo ───────────────────────────
+# If setup.sh is sitting next to this script, we have everything we need.
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" 2>/dev/null && pwd || echo "")"
+if [ -f "${SCRIPT_DIR}/setup.sh" ]; then
+    echo "  Running from local copy at $SCRIPT_DIR"
+    echo "  (No git or internet needed)"
+    echo ""
+    # Copy to home so the install persists after the USB is removed
+    if [ "$SCRIPT_DIR" != "$DEST" ]; then
+        echo "  Copying to $DEST for future use..."
+        cp -r "$SCRIPT_DIR" "$DEST" 2>/dev/null \
+            && chown -R "${SUDO_USER:-$(id -un)}:" "$DEST" 2>/dev/null || true
+        echo ""
+    fi
+    exec bash "${SCRIPT_DIR}/setup.sh"
+fi
+
+# ── Options 1 & 2: clone from GitHub ─────────────────────────────────────────
 if ! command -v git >/dev/null 2>&1; then
-    echo "Installing git..."
+    echo "  Installing git..."
     apt-get update -qq && apt-get install -y git
 fi
 
-# 2) Clone or update
+# Build clone URL (with PAT if supplied)
+CLONE_URL="$REPO_URL"
+if [ -n "$PAT" ]; then
+    CLONE_URL="https://${PAT}@github.com/${REPO_URL#https://github.com/}"
+fi
+
 if [ -d "$DEST/.git" ]; then
-    echo "Repo already exists at $DEST — pulling latest..."
+    echo "  Repo already exists at $DEST — pulling latest..."
     git -C "$DEST" pull --ff-only || echo "  (pull failed — continuing with existing version)"
 else
-    echo "Cloning to $DEST ..."
-    git clone "$REPO_URL" "$DEST"
+    echo "  Cloning to $DEST ..."
+    git clone "$CLONE_URL" "$DEST"
+    # Remove PAT from stored remote URL so it isn't saved in plain text
+    if [ -n "$PAT" ]; then
+        git -C "$DEST" remote set-url origin "$REPO_URL"
+    fi
 fi
 
 echo ""
-echo "Launching setup..."
+echo "  Launching setup..."
 echo ""
 
 exec bash "$DEST/setup.sh"