pdist: Add pdist-bootcheck

Add service to check pdist time for the booting system. If older than 7
days, request a synchonous pdist from the distmater and reboot. If only
older than 1 day, require an asynchronous pdist while the boot can
continue.

install.sh

@@ -275,6 +275,8 @@ install_data mxstartup/mxstartup.service                  "$DESTDIR$systemdunitd
 install_data misc_systemd_units/lightdm.service           "$DESTDIR$systemdunitdir/lightdm.service"
 install_data pdist/pdistd.socket                          "$DESTDIR$systemdunitdir/pdistd.socket"
 install_data pdist/pdistd@.service                        "$DESTDIR$systemdunitdir/pdistd@.service"
+install_exec pdist/pdist-bootcheck                        "$DESTDIR$usr_exec_prefix/libexec/pdist-bootcheck"
+install_data pdist/pdist-bootcheck.service                "$DESTDIR$systemdunitdir/pdist-bootcheck.service"
 
 postinstall
 exit

pdist/pdist-bootcheck

@@ -0,0 +1,42 @@
+#! /bin/bash
+
+set -e
+
+if [ -e /.pdist_status ]; then
+    now=$(date +%s)
+    if [ $now -lt $(date +%s -d 2023-06-01) ]; then
+        echo $(date -d $now): implausible system time
+        exit 1
+    fi
+    echo "system time: $(date -d @$now)"
+    pdist_time=$(stat -c%Y /.pdist_status)
+    echo "pdist time:  $(date -d @$pdist_time)"
+    pdist_age=$(( ($now - $pdist_time) /60 /60 /24 ))
+    echo "pdist age:   $pdist_age days"
+    if [ $pdist_age -ge 7 ]; then
+        need_pdist_and_reboot=1
+    elif [ $pdist_age -ge 1 ]; then
+        need_async_pdist=1
+    else
+        echo no update required
+    fi
+else
+    echo "no recorded update time"
+    need_pdist_and_reboot=1
+fi
+
+if [ "$need_async_pdist" ]; then
+    netcat $(distmaster) 237 >/dev/null 2>&1 </dev/null &
+    echo triggered background update
+elif [ "$need_pdist_and_reboot" ]; then
+    if [[ -e /var/run/updatecheck.reboot-triggered ]]; then
+        echo "Update and reboot required but prevented due to previous attempt"
+        rm /var/run/updatecheck.reboot-triggered
+        exit 1
+    fi
+    echo "Update and reboot required. Please be patient..."
+    netcat $(distmaster) 237
+    mxgrub default
+    touch /var/run/updatecheck.reboot-triggered
+    systemctl start reboot.target --job-mode=replace-irreversibly
+fi

pdist/pdist-bootcheck.service

@@ -0,0 +1,15 @@
+[Unit]
+After=network-online.target
+Wants=network-online.target
+Before=getty-pre.target
+Wants=getty-pre.target
+ConditionPathExists=/node/tags/desktop
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+StandardOutput=journal+console
+ExecStart=/usr/libexec/pdist-bootcheck
+
+[Install]
+WantedBy=multi-user.target