From 02dbaca95c6549e4ecf3764297c0c68b83b704c2 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Thu, 14 Mar 2024 17:38:52 +0100
Subject: so geht's vllt. per systemd

---
 computer-time-limit | 65 ++++++++++++++++++++++++++++++++---------------------
 1 file changed, 40 insertions(+), 25 deletions(-)

diff --git a/computer-time-limit b/computer-time-limit
index 85e8974..638a2d7 100755
--- a/computer-time-limit
+++ b/computer-time-limit
@@ -18,16 +18,15 @@ if [ -d "${dir}"'/.git' ] && [ $# -eq 0 ] && [ "$(stat -c%U "${dir}"'/.git')" =
   fi
 fi
 
-unset key_file
-
-for dir in ~/.local/keys $(mount | cut -d' ' -f3)/keys ''; do
-  [ -d "${dir}" ] || continue
-  key_file=$(
-    find "${dir}" -mindepth 1 -maxdepth 1 -type f -name '*.sec' \
+mapfile -t users < <(
+  cut -d: -f1,6 /etc/passwd \
+  | while IFS=':' read -r user home; do
+    dir="${home}/.local/keys"
+    [ -d "${dir}" ] || continue
+    find "${dir}" -mindepth 1 -maxdepth 1 -type f -name '*.sec' -printf "${user}"' %p\n' \
     | head -n1
-  )
-  [ -f "${key_file}" ] && break
-done
+  done
+)
 
 sende_msg() {
   curl \
@@ -36,16 +35,16 @@ sende_msg() {
     --data "msg=$1" \
     --data "sig=$(
       echo "$1" \
-      | signify -S -s "${key_file}" -m /dev/stdin -x /dev/stdout \
+      | signify -S -s "$2" -m /dev/stdin -x /dev/stdout \
       | base64 -w0
     )" \
     'https://eckner.net/computer-time-limit.php'
 }
 
 wie_lange_noch() {
-  if [ -f "${key_file}" ]; then
+  if [ -f "$1" ]; then
     erg=$(
-      sende_msg start
+      sende_msg start "$1"
     )
     if [ -n "${erg}" ] && ! echo "${erg}" | grep -qvx '[0-9]\+'; then
       noch="${erg}"
@@ -60,18 +59,9 @@ wie_lange_noch() {
   fi
 }
 
-still_logged_in() {
-  if users | grep -qwF "$(whoami)"; then
-    wie_lange_noch
-    return 0
-  fi
-  sende_msg stop
-  return 1
-}
-
 check_time() {
   if [ "${noch}" -le 0 ]; then
-    sende_msg stop
+    sende_msg stop "$1"
     loginctl session-status | sed -n 's/ .*$//;1p' | xargs -r loginctl terminate-session
   fi
   if [ "${noch}" -lt 3630 ] && [ "${noch}" -gt 3570 ]; then
@@ -106,11 +96,36 @@ check_time() {
   fi
 }
 
-trap 'sende_msg stop' EXIT
+is_logged_in() {
+  if users | grep -qwF "$1"; then
+    return 0
+  fi
+  if loginctl list-users -l | sed -n '2,/^$/p' | awk '{print $2}' | grep -qxF "$1"; then
+    return 0
+  fi
+  return 1
+}
+
+stop_all() {
+  for key_file in "${users[@]#* }"; do
+    sende_msg stop "${key_file}"
+  done
+}
+
+trap 'stop_all' EXIT
 noch=0
 ab=$(date +%s)
 
-while still_logged_in; do
+while true; do
+  for user_and_key in "${users[@]}"; do
+    user="${user_and_key%% *}"
+    key="${user_and_key#* }"
+    if is_logged_in "${user}"; then
+      wie_lange_noch "${key}"
+      check_time "${user}" "${key}"
+    else
+      sende_msg stop "${key}"
+    fi
+  done
   sleep $((15 + ((noch + 15) % 30)))
-  check_time
 done
-- 
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