215 lines
9.6 KiB
Bash
Executable File
215 lines
9.6 KiB
Bash
Executable File
#!/bin/bash
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# =============================================================================
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# migrate-to-lightdm.sh — switch an existing install to Plymouth + LightDM
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# =============================================================================
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# Migrates a machine that currently boots ly / greetd / GDM / SDDM / LXDM (or any
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# other display manager) to this repo's boot experience:
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#
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# Plymouth skull splash → LightDM + lightdm-gtk-greeter (cyberqueer theme)
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#
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# What it does:
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# 1. Detects the currently-configured display manager(s).
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# 2. Disables every known greeter EXCEPT lightdm — for the NEXT boot only. It
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# does NOT stop your running session, so you stay logged in until you
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# reboot yourself.
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# 3. Runs the lightdm module (installs LightDM + lightdm-gtk-greeter, deploys
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# the cyberqueer greeter config + skull background, enables lightdm.service).
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# 4. Purges obsolete Plymouth artifacts left by earlier versions of this repo
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# (e.g. the spinner's dot.png) so an upgraded install ends up byte-clean.
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# 5. Runs the plymouth module (skull splash, initramfs + GRUB cmdline) unless
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# --no-plymouth is given.
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#
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# It reuses the real module scripts under optional-Modules/apps/ so there is no
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# duplicated install logic — this tool only handles detection, teardown of the
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# OLD display manager, and orchestration.
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#
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# Double duty: on a machine that is ALREADY on Plymouth + LightDM (an install
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# migrated by an earlier version of this repo) re-running simply refreshes the
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# greeter config and re-installs the current Plymouth theme — the clean upgrade
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# path from the old full-screen-skull + spinner splash to the centred-skull +
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# boot-log-tail one.
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#
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# Safe to re-run (idempotent). Reboot to complete the switch.
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#
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# Usage:
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# migrate-to-lightdm.sh [--yes] [--no-plymouth] [--dry-run] [--help]
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# -y, --yes Skip the confirmation prompt (required for non-TTY runs)
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# --no-plymouth Migrate the display manager only; leave Plymouth alone
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# -n, --dry-run Print what would happen; change nothing
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# -h, --help Show this help and exit
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# =============================================================================
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set -euo pipefail
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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SETUP_DIR="$(cd "$SCRIPT_DIR/.." && pwd)"
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APPS="$SETUP_DIR/modules/optional-Modules/apps"
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# Shared helpers: log / skip / warn / err, and best-effort disable_service.
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source "$SETUP_DIR/modules/lib/logging.sh"
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# ── Argument parsing ──────────────────────────────────────────────────────────
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ASSUME_YES=0
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DO_PLYMOUTH=1
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DRY_RUN=0
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usage() {
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cat <<'EOF'
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migrate-to-lightdm.sh — switch this machine to Plymouth + LightDM (cyberqueer)
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Disables the current display manager (ly / greetd / GDM / SDDM / LXDM / …) for
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the next boot, installs and themes LightDM, and sets up the Plymouth splash. Your
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running session is left untouched; reboot to complete the switch.
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Usage:
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migrate-to-lightdm.sh [--yes] [--no-plymouth] [--dry-run] [--help]
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-y, --yes Skip the confirmation prompt (required for non-TTY runs)
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--no-plymouth Migrate the display manager only; leave Plymouth alone
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-n, --dry-run Print what would happen; change nothing
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-h, --help Show this help and exit
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EOF
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}
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while [[ $# -gt 0 ]]; do
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case "$1" in
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-y|--yes) ASSUME_YES=1 ;;
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--no-plymouth) DO_PLYMOUTH=0 ;;
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-n|--dry-run) DRY_RUN=1 ;;
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-h|--help) usage; exit 0 ;;
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*) err "Unknown argument: $1"; echo "Try --help." >&2; exit 2 ;;
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esac
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shift
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done
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# In dry-run, describe an action instead of doing it. In real mode, run it.
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run() {
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if (( DRY_RUN )); then
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printf '[dry-run] would run: %s\n' "$*"
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else
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"$@"
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fi
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}
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# ── Known display managers ────────────────────────────────────────────────────
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# Every greeter/DM unit this tool knows how to turn off. lightdm is the TARGET,
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# so it never appears here. ly is a template unit (ly@tty1) but some setups use
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# the plain ly.service alias, so both are listed.
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OTHER_DMS=(
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"ly@tty1.service" "ly.service"
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"greetd.service"
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"gdm.service" "gdm3.service"
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"sddm.service"
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"lxdm.service"
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"xdm.service"
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"slim.service"
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"lemurs.service"
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"emptty.service"
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)
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# ── 1. Detect what is configured now ──────────────────────────────────────────
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log "Detecting the current display manager configuration..."
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# The canonical "which DM boots" pointer is the display-manager.service symlink.
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# Use plain readlink to get the intended target name even if the link is broken;
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# a self-referential/absent target means no real DM is configured there.
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primary_dm=""
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if dm_link="$(readlink /etc/systemd/system/display-manager.service 2>/dev/null)"; then
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dm_link="$(basename "$dm_link")"
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[[ "$dm_link" != "display-manager.service" ]] && primary_dm="$dm_link"
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fi
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# Also probe every known unit directly — ly-based installs often have no
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# display-manager.service symlink, they just enable ly@tty1 on tty1.
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enabled_dms=()
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for unit in "${OTHER_DMS[@]}"; do
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state="$(systemctl is-enabled "$unit" 2>/dev/null || true)"
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[[ "$state" == "enabled" || "$state" == "alias" || "$state" == "enabled-runtime" ]] \
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&& enabled_dms+=("$unit")
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done
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# `is-enabled` on an absent unit both prints "not-found" and exits non-zero;
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# capture with `|| true` (never `|| echo`, which would concatenate two lines)
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# and normalise the "not installed" cases to one label.
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lightdm_state="$(systemctl is-enabled lightdm.service 2>/dev/null || true)"
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[[ -z "$lightdm_state" || "$lightdm_state" == "not-found" ]] && lightdm_state="not-installed"
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echo
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echo " Current display-manager.service : ${primary_dm:-<none>}"
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if (( ${#enabled_dms[@]} )); then
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echo " Enabled greeter units : ${enabled_dms[*]}"
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else
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echo " Enabled greeter units : <none detected>"
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fi
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echo " lightdm.service : $lightdm_state"
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echo " Plymouth migration : $( ((DO_PLYMOUTH)) && echo 'yes' || echo 'skipped (--no-plymouth)')"
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echo
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if (( ${#enabled_dms[@]} == 0 )) && [[ "$lightdm_state" == "enabled" ]]; then
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log "LightDM already appears to be the active greeter — re-running to refresh config/theme."
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fi
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# ── 2. Confirm ────────────────────────────────────────────────────────────────
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# This changes what greets you at the NEXT boot. Require an explicit yes unless
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# --yes was given; on a non-interactive stdin, --yes is mandatory.
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if (( ! ASSUME_YES )); then
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if [[ ! -t 0 ]]; then
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err "Non-interactive shell and --yes not given — refusing to change the display manager."
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exit 1
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fi
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read -r -p "Switch this machine to Plymouth + LightDM as described above? [y/N] " reply
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case "$reply" in
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y|Y|yes|YES) ;;
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*) warn "Aborted — nothing changed."; exit 0 ;;
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esac
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fi
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# ── 3. Disable the OLD display managers (next boot only) ──────────────────────
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# We intentionally do NOT `systemctl stop` the running greeter: that would kill
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# your current graphical session. Disabling only removes it from the next boot;
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# lightdm.service (enabled below) takes over then.
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if (( ${#enabled_dms[@]} )); then
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log "Disabling old display manager(s) for the next boot: ${enabled_dms[*]}"
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for unit in "${enabled_dms[@]}"; do
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run disable_service "$unit"
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done
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else
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skip "No competing display managers enabled — nothing to disable."
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fi
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# ── 4. Install + theme + enable LightDM (delegated to the module) ─────────────
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# lightdm.sh installs LightDM + the GTK greeter, deploys the cyberqueer greeter
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# config + skull background, disables greetd/ly@tty1/getty@tty1, and enables
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# lightdm.service. Running it here keeps a single source of truth.
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log "Setting up LightDM via the lightdm module..."
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run bash "$APPS/lightdm.sh"
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# ── 5. Plymouth splash (delegated to the module) ──────────────────────────────
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if (( DO_PLYMOUTH )); then
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# Upgrade cleanup: the current theme is a centred skull + boot-log tail. The
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# previous version scaled the skull full-screen and drew a spinning-dot
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# throbber from dot.png. That file is now dead weight — strip it (and any
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# other stale theme assets) BEFORE re-running the module, so it is neither
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# rendered nor baked into the initramfs that plymouth.sh rebuilds.
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THEME_DIR="/usr/share/plymouth/themes/m-archy"
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for stale in "$THEME_DIR/dot.png"; do
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if [[ -e "$stale" ]]; then
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log "Removing obsolete Plymouth asset: $stale"
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run sudo rm -f "$stale"
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fi
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done
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log "Setting up the Plymouth splash via the plymouth module..."
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run bash "$APPS/plymouth.sh"
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else
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skip "Skipping Plymouth setup (--no-plymouth)."
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fi
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# ── Done ──────────────────────────────────────────────────────────────────────
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echo
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if (( DRY_RUN )); then
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log "Dry run complete — no changes were made."
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else
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log "Migration complete. Your current session is untouched."
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log "Reboot to boot into the Plymouth splash and the LightDM cyberqueer greeter."
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fi
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