script to switch from one server to another

busunit/scripts/unpack_server_data.sh

@@ -0,0 +1,125 @@
+#!/bin/bash
+#
+# Copyright (c) 2019 Clementine Computing LLC.
+# 
+# This file is part of PopuFare.
+# 
+# PopuFare is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+# 
+# PopuFare is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+# 
+# You should have received a copy of the GNU Affero General Public License
+# along with PopuFare.  If not, see <https://www.gnu.org/licenses/>.
+#
+
+export BASEDIR="/home/bus"
+
+. $BASEDIR/bin/common_values.sh
+
+usage() {
+	echo -e "Usage:" 1>&2
+	echo -e "\t$0 line_number" 1>&2
+	exit 1
+}
+
+# If the supplied line number is not numeric, complain!
+#
+if echo "$1" | egrep -v '^[0-9]+$' > /dev/null; then usage; fi
+
+# Create a temporary file to hold the selected config line for disection
+#
+tmpfile=`mktemp /tmp/unpack_server_tmp.XXXXXX`
+
+# Disect the server list and get the first N lines, and then the last one line of that set will be line N
+#
+head -n "$1" "$SERVER_LIST_FILE" | tail -n 1 > $tmpfile
+
+# Make sure that we have the expected six fields in this line
+#
+if [ `cat $tmpfile | tr '\t' '\n' | wc -l` -ne 6 ]; then 
+	echo "Line $1 does not contain the required 6 tab-delimited fields. Not altering server config." 1>&2; 
+	rm -f $tmpfile; 
+	usage; 
+fi
+
+# Extract the target username...
+#
+ssh_target_user="`cat $tmpfile | cut -f2`"
+
+# Extract the target hostname...
+#
+ssh_target_host="`cat $tmpfile | cut -f3`"
+
+# Now, take the username and hostname and make a ssh_target
+#
+ssh_target="$ssh_target_user@$ssh_target_host"
+
+# If they pass the "smell test", we will proceed, otherwise we bail...
+#
+if echo "$ssh_target" | egrep -qv "$SSH_TARGET_VALIDITY_CHECK"; then
+	echo "Target specified on line $1 appears to be invalid \"$ssh_target\". Not altering server config." 1>&2
+	rm -f $tmpfile
+	usage
+fi
+
+# If we've gotten this far, we are going to go through with it...
+#
+
+# Extract and save our description...
+#
+cat $tmpfile | cut -f1 > $SYNC_DESC_FILE
+
+# Save our new sync target "user@host"...
+#
+echo "$ssh_target" > $SYNC_TARGET_FILE
+
+# Extract and save our new port number...
+#
+cat $tmpfile | cut -f4 > $SYNC_PORT_FILE
+
+# Here we need to first put in our target hostname, followed by a space (but no newline)
+#
+
+echo -n "$ssh_target_host " > $SYNC_KNOWN_HOSTS
+# then append the 5th field (target host's public key)
+#
+cat $tmpfile | cut -f5 >> $SYNC_KNOWN_HOSTS
+
+# and set the correct permissions
+#
+chmod $PACKAGE_SSH_MILD_FILE_PERMISSIONS $SYNC_KNOWN_HOSTS
+
+# Here we need to put the correct preface/header on the private key
+
+echo "-----BEGIN RSA PRIVATE KEY-----" > $SYNC_PRIVATE_KEY
+
+# next we need to take the 6th field, and reconstitute all the spaces into newlines
+#
+cat $tmpfile | cut -f6 | tr ' ' '\n' >> $SYNC_PRIVATE_KEY
+
+# add on the terminating line
+
+echo "-----END RSA PRIVATE KEY-----" >> $SYNC_PRIVATE_KEY
+
+# and set the correct permissions 
+#
+chmod $PACKAGE_SSH_STRICT_FILE_PERMISSIONS $SYNC_PRIVATE_KEY
+
+# remove our temporary file
+#
+rm -f $tmpfile
+
+# sync the secondary storage
+#
+sync
+
+# and signal that we want to close any open SSH sessions and start a new one with the new server
+#
+abort_tunnel_and_update
+