Import initial Hyprland HDMI recovery implementation

2026-09-23 09:10:57 +02:00
commit 73e727ef4c
@@ -0,0 +1,115 @@
+#!/usr/bin/env bash
+set -u
+
+LOGTAG="revive-monitor-drm-watch"
+CONFIG_FILE="${XDG_CONFIG_HOME:-$HOME/.config}/revive-monitor/config.env"
+FIX_SCRIPT="${REVIVE_MONITOR_FIX_SCRIPT:-$HOME/.local/bin/revive-monitor-fix}"
+
+# Defaults. Override in ~/.config/revive-monitor/config.env
+DEBOUNCE_SECONDS="30"
+
+if [[ -r "$CONFIG_FILE" ]]; then
+    # shellcheck disable=SC1090
+    source "$CONFIG_FILE"
+fi
+
+STATE_DIR="${XDG_RUNTIME_DIR:-/tmp}/revive-monitor"
+LAST_RUN_FILE="$STATE_DIR/last-drm-hotplug-run"
+
+mkdir -p "$STATE_DIR"
+
+log() {
+    logger -t "$LOGTAG" -- "$*"
+}
+
+get_active_wayland_session() {
+    local sid
+    local name
+    local type
+    local active
+    local vt
+
+    while read -r sid; do
+        [[ -n "$sid" ]] || continue
+
+        name="$(loginctl show-session "$sid" -p Name --value 2>/dev/null)"
+        [[ "$name" == "$USER" ]] || continue
+
+        type="$(loginctl show-session "$sid" -p Type --value 2>/dev/null)"
+        [[ "$type" == "wayland" ]] || continue
+
+        active="$(loginctl show-session "$sid" -p Active --value 2>/dev/null)"
+        [[ "$active" == "yes" ]] || continue
+
+        vt="$(loginctl show-session "$sid" -p VTNr --value 2>/dev/null)"
+
+        if [[ "$vt" =~ ^[1-9][0-9]*$ ]]; then
+            printf '%s:%s\n' "$sid" "$vt"
+            return 0
+        fi
+    done < <(
+        loginctl list-sessions --no-legend --no-pager 2>/dev/null | awk '{print $1}'
+    )
+
+    return 1
+}
+
+run_recovery() {
+    local session_info
+    local session_id
+    local graphical_vt
+    local now
+    local last="0"
+    local diff
+
+    if ! session_info="$(get_active_wayland_session)"; then
+        log "No active Wayland session - DRM hotplug ignored"
+        return 0
+    fi
+
+    session_id="${session_info%%:*}"
+    graphical_vt="${session_info##*:}"
+
+    now="$(date +%s)"
+
+    if [[ -r "$LAST_RUN_FILE" ]]; then
+        last="$(cat "$LAST_RUN_FILE" 2>/dev/null || printf '0')"
+    fi
+
+    [[ "$last" =~ ^[0-9]+$ ]] || last="0"
+    diff=$((now - last))
+
+    if (( diff < DEBOUNCE_SECONDS )); then
+        log "DRM hotplug ignored because of debounce (${diff}s)"
+        return 0
+    fi
+
+    printf '%s\n' "$now" > "$LAST_RUN_FILE"
+
+    log "DRM hotplug detected - Wayland session $session_id on VT $graphical_vt"
+
+    "$FIX_SCRIPT" "$graphical_vt"
+
+    log "Recovery after DRM hotplug finished"
+}
+
+if ! command -v udevadm >/dev/null 2>&1; then
+    log "udevadm not found"
+    exit 1
+fi
+
+if [[ ! -x "$FIX_SCRIPT" ]]; then
+    log "Recovery script is not executable: $FIX_SCRIPT"
+    exit 1
+fi
+
+log "Listening for DRM hotplug events"
+
+stdbuf -oL udevadm monitor --kernel --property --subsystem-match=drm |
+while IFS= read -r line; do
+    case "$line" in
+        HOTPLUG=1)
+            run_recovery
+            ;;
+    esac
+done