From d09cc1546b4ef3d9e29e23520f08a2d3abd9ce9d Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Wed, 15 Jan 2020 12:11:39 +0100
Subject: Use original deadline if user logged out

We add 300 seconds to the deadline if a user is currently logged in.
Even if the user logs out immediately, we still wait those extra 5
minutes. Add ugly code to immediately trigger the shutdown (or
whatever) in that case.
---
 src/main.c | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/src/main.c b/src/main.c
index c3d2cd0..35d983e 100644
--- a/src/main.c
+++ b/src/main.c
@@ -35,6 +35,7 @@ static const char *shutdownActions[SHUTDOWN_ENUM_END] = {
 #define TABMAX (20)
 static struct {
     time_t deadline; // MONOTONIC; 0 = none, or last one was disarmed and time elapsed past deadline
+    time_t noUserDeadline; // In case no user is logged in, consider this deadline too
     enum Shutdown action;
     bool disarmed;
     bool force;
@@ -219,13 +220,17 @@ int main( int argc, char **argv )
         } // End loop over users
         const time_t monoNOW = now();
         // See if any reboot or poweroff is due (if none is currently pending or still 5min+ away)
-        if ( ! nextAction.force && config.shutdowns > 0 && ( nextAction.deadline == 0 || nextAction.deadline - monoNOW > 300 ) ) {
+        if ( ! nextAction.force && config.shutdowns > 0 // Next action is not forced, and have shutdown schedule
+                // and no current action pending, or next action more than 5 mins away
+                && ( nextAction.deadline == 0 || nextAction.deadline - monoNOW > 300 ) ) {
+            // next action is more than 5 mins away, reset for now
             if ( nextAction.deadline != 0 && nextAction.deadline - monoNOW > 300 ) {
                 nextAction.deadline = 0;
             }
             const time_t NOW = time( NULL );
             time_t deadline;
             int delta;
+            // Loop through all scheduled actions and find the next one
             for ( idx = 0; idx < config.shutdowns; ++idx ) {
                 deadline = combineTime( NOW, &config.shutdown[idx] );
                 if ( deadline == 0 )
@@ -234,6 +239,7 @@ int main( int argc, char **argv )
                 if ( delta >= -6 && ( nextAction.deadline == 0 || ( nextAction.deadline - monoNOW - 3 ) > delta ) ) {
                     // Engage
                     nextAction.deadline = monoNOW + ( delta < 0 ? 0 : delta );
+                    nextAction.noUserDeadline = nextAction.deadline;
                     nextAction.disarmed = false;
                     nextAction.action = config.shutdown[idx].action;
                     if ( delta < 300 ) {
@@ -264,12 +270,22 @@ int main( int argc, char **argv )
         }
         if ( nextAction.deadline != 0 && ( count == 0 || ( monoNOW - lastActivity ) >= config.minIdle || nextAction.force ) ) {
             // Some action seems pending
-            const int remaining = nextAction.deadline - monoNOW;
+            int remaining;
+            // No user logged in, no user deadline is max. 300 seconds in the past -> use that value
+            if ( userCount == 0 && nextAction.noUserDeadline + 300 > monoNOW && nextAction.noUserDeadline < nextAction.deadline ) {
+                remaining = nextAction.noUserDeadline - monoNOW;
+                if ( remaining < 0 ) {
+                    remaining = 0;
+                }
+            } else {
+                remaining = nextAction.deadline - monoNOW;
+            }
             if ( remaining < -60 ) {
                 if ( ! nextAction.disarmed ) {
-                    fprintf( stderr, "Missed planned action!? Late by %d seconds. Ignored.\n", remaining );
+                    fprintf( stderr, "Missed planned action!? Late by %d seconds. Ignored.\n", -remaining );
                 }
                 nextAction.deadline = 0;
+                nextAction.noUserDeadline = 0;
             } else if ( ! nextAction.disarmed ) {
                 if ( remaining <= 1 ) {
                     // Execute!
@@ -551,6 +567,7 @@ void main_queueAction( enum Shutdown action, int delta )
     if ( delta < 0 || action < 0 || action >= SHUTDOWN_ENUM_END )
         return;
     time_t monoNOW = now();
+    int realDelta = delta;
     if ( userCount != 0 ) {
         int idleTime = monoNOW - lastActivity;
         if ( idleTime < 3600 ) {
@@ -566,6 +583,7 @@ void main_queueAction( enum Shutdown action, int delta )
     if ( nextAction.deadline == 0 || ( nextAction.deadline - monoNOW - 3 ) > delta ) {
         // Engage
         nextAction.deadline = monoNOW + delta;
+        nextAction.noUserDeadline = monoNOW + realDelta;
         nextAction.disarmed = false;
         nextAction.force = true;
         nextAction.action = action;
-- 
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