+# We don't use a secret keyring, of course, but gpg panics and
+# implodes if there isn't one available
+
+GPG_CMD="gpg --no-options --no-default-keyring --secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg"
+GPG="$GPG_CMD --keyring /etc/apt/trusted.gpg"
+
+
+ARCHIVE_KEYRING=/usr/share/keyrings/ubuntu-archive-keyring.gpg
+REMOVED_KEYS=/usr/share/keyrings/ubuntu-archive-removed-keys.gpg
+
+
+update() {
+ if [ ! -f $ARCHIVE_KEYRING ]; then
+ echo >&2 "ERROR: Can't find the archive-keyring"
+ echo >&2 "Is the ubuntu-keyring package installed?"
+ exit 1
+ fi
+
+ # add new keys
+ $GPG_CMD --quiet --batch --keyring $ARCHIVE_KEYRING --export | $GPG --ignore-time-conflict --import
+
+ # remove no-longer used keys
+ keys=`$GPG_CMD --keyring $REMOVED_KEYS --with-colons --list-keys|awk '/^pub/{FS=":";print $5}'`
+ for key in $keys; do
+ if $GPG --list-keys --with-colons | awk '/^pub/{FS=":";print $5}'|grep -q $key; then
+ $GPG --quiet --batch --delete-key --yes ${key}
+ fi
+ done
+}
+