Add gdm-settings-sync utility ...
... that syncs `dconf` settings of the local user to `gdm3`, the main login window after boot
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189
.local/bin/gdm-settings-sync
Executable file
189
.local/bin/gdm-settings-sync
Executable file
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#!/bin/sh
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# Install the GDM greeter's `dconf` settings into /etc/dconf/db/gdm.d/
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#
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# The keys listed in `$MIRROR_PATHS` below are read from
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# the live user session and written as one keyfile
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#
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# The greeter runs as the `Debian-gdm` user and never sees
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# the user-level settings in ~/.config/gnome-settings/*.ini
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#
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# The keyfile is written, not symlinked,
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# so that the greeter does not depend on ~/ being readable
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#
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# Without root privileges, this script only checks and reports
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# => Run with `sudo` to install
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set -eu
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SELF_DIR=$(cd "$(dirname "$0")" && pwd)
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TARGET_DIR=/etc/dconf/db/gdm.d
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COMPILED_DB=/etc/dconf/db/gdm
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# Only files with this prefix are managed (and pruned) here
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PREFIX=90-dotfiles-
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MIRRORED=mirrored
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# Keys mirrored from the live user session into the GDM greeter
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#
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# One absolute `dconf` path per line
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# => Unset keys are skipped, so the greeter keeps its defaults
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MIRROR_PATHS='
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# Idle and power
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#
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# Only the AC keys => On battery, the greeter keeps suspending
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/org/gnome/desktop/session/idle-delay
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/org/gnome/settings-daemon/plugins/power/idle-brightness
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/org/gnome/settings-daemon/plugins/power/idle-dim
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/org/gnome/settings-daemon/plugins/power/power-saver-profile-on-low-battery
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/org/gnome/settings-daemon/plugins/power/sleep-inactive-ac-timeout
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/org/gnome/settings-daemon/plugins/power/sleep-inactive-ac-type
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# Would disarm the physical power button at the greeter as well
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# /org/gnome/settings-daemon/plugins/power/power-button-action
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# Keyboard (e.g., Caps Lock as Control while typing the password)
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/org/gnome/desktop/input-sources/sources
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/org/gnome/desktop/input-sources/xkb-options
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/org/gnome/desktop/peripherals/keyboard/numlock-state
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# Touchpad and mouse
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/org/gnome/desktop/peripherals/mouse/natural-scroll
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/org/gnome/desktop/peripherals/touchpad/natural-scroll
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/org/gnome/desktop/peripherals/touchpad/tap-to-click
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# Top bar
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/org/gnome/desktop/interface/accent-color
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/org/gnome/desktop/interface/clock-format
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/org/gnome/desktop/interface/clock-show-date
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/org/gnome/desktop/interface/clock-show-seconds
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/org/gnome/desktop/interface/clock-show-weekday
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/org/gnome/desktop/interface/show-battery-percentage
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'
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if ! command -v gdm3 >/dev/null 2>&1 && [ ! -d /etc/gdm3 ]; then
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echo "GDM is not installed => Nothing to do"
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exit 0
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fi
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if ! command -v dconf >/dev/null 2>&1; then
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echo "dconf is not installed" >&2
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exit 1
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fi
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# As root, the live settings must come from the invoking user
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if [ "$(id -u)" = 0 ] && [ "${SUDO_USER:-root}" = "root" ]; then
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echo "Run via sudo from the user whose settings to mirror" >&2
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exit 1
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fi
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# The mirrored paths, without comments and blank lines
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_mirror_paths() {
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printf '%s\n' "$MIRROR_PATHS" | grep -Ev '^[[:space:]]*(#|$)' | sort -u
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}
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# `dconf read` as the session user, also when run via `sudo`
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# (reads need no D-Bus, only the user's database file)
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_dconf_read() {
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if [ "$(id -u)" = 0 ]; then
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_home=$(getent passwd "$SUDO_USER" | cut -d: -f6)
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runuser -u "$SUDO_USER" -- env \
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HOME="$_home" \
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XDG_CONFIG_HOME="$_home/.config" \
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XDG_RUNTIME_DIR="/run/user/$(id -u "$SUDO_USER")" \
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dconf read "$1"
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else
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dconf read "$1"
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fi
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}
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_render_mirrored() {
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echo "# Written by gdm-settings-install from the live user session - do not edit"
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_mirror_paths | while IFS= read -r path; do
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_value=$(_dconf_read "$path")
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[ -n "$_value" ] || continue # Unset => Keep the greeter's default
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_dir=${path%/*}
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_dir=${_dir#/}
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if [ "$_dir" != "${_last:-}" ]; then
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printf '\n[%s]\n' "$_dir"
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_last=$_dir
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fi
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printf '%s=%s\n' "${path##*/}" "$_value"
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done
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}
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_in_sync() {
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[ -f "$COMPILED_DB" ] || return 1
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_render_mirrored | cmp -s - "$TARGET_DIR/$PREFIX$MIRRORED" || return 1
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# No other managed file may be left over (e.g., from older versions)
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for dst in "$TARGET_DIR/$PREFIX"*; do
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[ -e "$dst" ] || continue
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[ "${dst##*/$PREFIX}" = "$MIRRORED" ] || return 1
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done
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# The compiled database must be newer than the keyfiles
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[ -z "$(find "$TARGET_DIR" -newer "$COMPILED_DB" 2>/dev/null)" ]
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}
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if _in_sync; then
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echo "GDM settings are up to date"
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exit 0
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fi
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if [ "$(id -u)" != 0 ]; then
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echo "" >&2
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echo "GDM settings are not installed or outdated" >&2
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echo "" >&2
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echo "Fix with: sudo $SELF_DIR/$(basename "$0")" >&2
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echo "" >&2
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exit 1
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fi
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mkdir -p "$TARGET_DIR"
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for dst in "$TARGET_DIR/$PREFIX"*; do
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[ -e "$dst" ] || continue
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[ "${dst##*/$PREFIX}" = "$MIRRORED" ] || rm -v -- "$dst"
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done
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_rendered=$(mktemp)
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trap 'rm -f "$_rendered"' EXIT
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_render_mirrored > "$_rendered"
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install -v -m 644 -- "$_rendered" "$TARGET_DIR/$PREFIX$MIRRORED"
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dconf update
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# Debian's `gdm` profile must read the "gdm" system database
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if ! grep -qs '^system-db:gdm$' /etc/dconf/profile/gdm /usr/share/dconf/profile/gdm; then
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echo "WARN: no dconf profile for gdm reads system-db:gdm" >&2
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fi
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echo "Installed the GDM settings into: $TARGET_DIR"
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echo "They take effect at the next start of the greeter (e.g., reboot)"
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