dom0: qvm-sync-dom0-clock

dom0/qvm-tools/qvm-sync-dom0-clock

@@ -0,0 +1,34 @@
+#!/bin/sh
+
+UPDATES_VM=`qvm-get-updatevm`
+
+QREXEC_CLIENT=/usr/lib/qubes/qrexec_client
+
+if [ -z "$UPDATES_VM" ]; then
+    echo "UpdateVM not set, exiting!" >&2
+    exit 1
+fi
+
+if ! xl domid "$UPDATES_VM" > /dev/null 2>&1; then
+    echo "UpdateVM not started, exiting!"
+    exit 1
+fi
+
+# dd is supposed to not allow memory exhaustion
+# grep does basic sanity checking
+# there seems to be no way to pass output of date +%s.%N to date,
+# so we use human-readable format
+
+CURRENT_TIME="$($QREXEC_CLIENT -d $UPDATES_VM 'user:date -u' |
+	dd count=1 2>/dev/null |
+	grep '^[A-Za-z]* [A-Za-z]* [ 0-9][0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9] [A-Z]* [0-9][0-9][0-9][0-9]$'|
+	head -1)"
+
+if [ -n "$CURRENT_TIME" ] ; then 
+	echo Syncing Dom0 clock: setting time "$CURRENT_TIME"...
+	sudo date -u -s "$CURRENT_TIME" ;
+	echo Done.
+else
+	echo "Error while parsing the time obtained from the UpdateVM ($UPDATES_VM).."
+fi
+