Add cloud-init.sh for provider install-script/user-data fields

IONOS Cloud Server, DigitalOcean, and Hetzner all offer an "install script"/user-data field that runs as root with no TTY while the image is still provisioning, so bootstrap.sh's interactive tail can't run there. cloud-init.sh clones the repo unattended and drops a one-shot /etc/profile.d hook that launches the normal whiptail setup.sh wizard on the first interactive login, then removes itself.
2026-08-10 02:29:02 +00:00
parent 5aef55a059
commit b2b4b6dd19
2 changed files with 84 additions and 0 deletions
@@ -33,6 +33,20 @@ the wizard — the USB can be unplugged once setup starts.
 sudo bash bootstrap.sh --pat ghp_xxxxxxxxxxxxxxxxxxxx
 ```
 Use a fine-grained read-only PAT scoped to just this repo (Contents: Read).
+
+**Cloud provider install-script / user-data field (IONOS, DigitalOcean,
+Hetzner, ...):** these run as root with no terminal attached while the
+image is still being provisioned, so `bootstrap.sh`'s interactive hand-off
+doesn't apply yet. Paste `cloud-init.sh` into that field instead:
+```
+https://raw.githubusercontent.com/outis1one/ubuntu-post-install/main/cloud-init.sh
+```
+It clones the repo in the background during provisioning and installs a
+one-shot login hook. The provider boots Ubuntu 24.04, this runs unattended,
+and by the time you SSH in the whiptail service menu is already waiting for
+you — same experience as `bootstrap.sh`, just already started. Assumes a
+root login (the default for all three providers above); see the comments in
+`cloud-init.sh` if you've provisioned a separate sudo user instead.
 The PAT is stripped from the stored remote URL after cloning.

 ## Usage
@@ -0,0 +1,70 @@
+#!/bin/bash
+# cloud-init.sh — payload for a cloud provider's "install script" / user-data
+# field (IONOS Cloud Server image deploy, DigitalOcean droplet user-data,
+# Hetzner Cloud user-data, etc). The provider runs this as root, unattended,
+# with no TTY, while the box is still being provisioned — before you have
+# ever logged in.
+#
+# It deliberately does NOT run the interactive wizard itself (there's no
+# terminal for whiptail to talk to yet). Instead it does two things:
+#
+#   1. Clones this repo to /root/ubuntu-post-install (pulls if already there).
+#   2. Installs a one-shot /etc/profile.d hook that launches setup.sh —
+#      the normal whiptail service menu — the first time you actually log
+#      in over SSH, then deletes itself so it never fires again.
+#
+# End result: the provider boots Ubuntu 24.04, this runs in the background,
+# and by the time you SSH in the checklist menu is sitting there waiting —
+# the same experience as running bootstrap.sh by hand, just already started.
+#
+# Usage: paste this file's raw URL into the provider's install-script /
+# user-data field, e.g.
+#   https://raw.githubusercontent.com/outis1one/ubuntu-post-install/main/cloud-init.sh
+#
+# Assumes the provider logs you in as root (the default for IONOS Cloud
+# Server, DigitalOcean droplets, and Hetzner Cloud server images). If you've
+# provisioned a separate non-root sudo user instead, the hook won't reach
+# you automatically — SSH in and run:
+#   sudo bash /root/ubuntu-post-install/setup.sh
+set -euo pipefail
+
+if [ "$(id -u)" -ne 0 ]; then
+    echo "cloud-init.sh must run as root — that's how provider install-script hooks already run it." >&2
+    exit 1
+fi
+
+REPO_URL="https://github.com/outis1one/ubuntu-post-install.git"
+DEST="/root/ubuntu-post-install"
+MARKER="/root/.ubuntu-post-install-pending"
+HOOK="/etc/profile.d/99-ubuntu-post-install.sh"
+
+command -v git >/dev/null 2>&1 || { apt-get update -qq && apt-get install -y git; }
+
+if [ -d "$DEST/.git" ]; then
+    git -C "$DEST" pull --ff-only || true
+else
+    git clone "$REPO_URL" "$DEST"
+fi
+
+touch "$MARKER"
+
+# POSIX sh, not bash — /etc/profile.d/*.sh gets sourced by whatever shell
+# the login uses, not necessarily bash.
+cat > "$HOOK" << 'EOF'
+# Installed by cloud-init.sh — launches the ubuntu-post-install wizard on
+# the first interactive login, then removes itself so it never fires again.
+MARKER="/root/.ubuntu-post-install-pending"
+HOOK="/etc/profile.d/99-ubuntu-post-install.sh"
+DEST="/root/ubuntu-post-install"
+
+if [ -f "$MARKER" ] && [ -t 0 ] && [ "$(id -u)" -eq 0 ] && [ -f "$DEST/setup.sh" ]; then
+    rm -f "$MARKER" "$HOOK"
+    echo ""
+    echo "ubuntu-post-install: launching the setup wizard..."
+    echo ""
+    bash "$DEST/setup.sh"
+fi
+EOF
+chmod 644 "$HOOK"
+
+echo "cloud-init.sh: repo cloned to $DEST — the setup wizard will launch on first login."