Rescue extension for TinyIPA with DHCP network

The patch adds the support for rescue mode with DHCP network in
TinyIPA.

Change-Id: I10cdb47eb3815db097bb3088d9dd4804b9d6a5d0
Depends-On: I9b4c1278dc5fab7888fbfe586c15e31ed3958978
Partial-Bug: #1526449

imagebuild/tinyipa/build_files/bootlocal.sh

@@ -23,9 +23,46 @@ if ! type "ironic-python-agent" > /dev/null ; then
     python /tmp/get-pip.py --no-wheel --no-index --find-links=file:///tmp/wheelhouse ironic_python_agent
 fi
 
+# Create ipa-rescue-config directory for rescue password
+sudo mkdir -p /etc/ipa-rescue-config
+
 export PYTHONOPTIMIZE=1
 
 # Run IPA
 echo "Starting Ironic Python Agent:"
 date
 ironic-python-agent 2>&1 | tee /var/log/ironic-python-agent.log
+
+
+create_rescue_user() {
+    crypted_pass=$(cat /etc/ipa-rescue-config/ipa-rescue-password)
+    sudo adduser rescue -D -G root # no useradd
+    echo "rescue:$crypted_pass" | sudo chpasswd -e
+    sudo sh -c "echo \"rescue ALL=(ALL) NOPASSWD: ALL\" >> /etc/sudoers" # no suooers.d in tiny core.
+
+    # Restart sshd with allowing password authentication
+    sudo sed -i -e 's/^PasswordAuthentication no/PasswordAuthentication yes/' /usr/local/etc/ssh/sshd_config
+    sudo /usr/local/etc/init.d/openssh restart
+}
+
+# Setup DHCP network
+configure_dhcp_network() {
+    for pidfile in `ls /var/run/udhcpc/*.pid`; do
+        kill `cat $pidfile`
+    done
+
+    # NOTE(TheJulia): We may need to add a short wait here as
+    # network interface plugging actions may not be asynchronous.
+    INTERFACES=$(ip -o link |grep "LOWER_UP"|cut -f2 -d" "|sed 's/://'|grep -v "lo")
+    for interface in $INTERFACES; do
+        pidfile="/var/run/udhcpc/${interface}.pid"
+        /sbin/udhcpc -b -p ${pidfile} -i ${interface} -s /opt/udhcpc.script >> /var/log/udhcpc.log 2>&1
+    done
+}
+
+if [ -f /etc/ipa-rescue-config/ipa-rescue-password ]; then
+    create_rescue_user || exit 0
+    configure_dhcp_network || exit 0
+else
+    echo "IPA has exited. No rescue password file was defined."
+fi

imagebuild/tinyipa/finalise-tinyipa.sh

@@ -141,6 +141,9 @@ cleanup_tce "$DST_DIR"
 # Copy bootlocal.sh to opt
 sudo cp "$WORKDIR/build_files/bootlocal.sh" "$FINALDIR/opt/."
 
+# Copy udhcpc.script to opt
+sudo cp "$WORKDIR/udhcpc.script" "$FINALDIR/opt/"
+
 # Disable ZSwap
 sudo sed -i '/# Main/a NOZSWAP=1' "$FINALDIR/etc/init.d/tc-config"
 # sudo cp $WORKDIR/build_files/tc-config $FINALDIR/etc/init.d/tc-config

imagebuild/tinyipa/udhcpc.script

@@ -0,0 +1,44 @@
+#!/bin/sh
+
+# udhcpc script edited by Tim Riker <Tim@Rikers.org>
+
+# file created to be used for static network configuration as well
+
+[ -z "$1" ] && echo "Error: should be called from udhcpc" && exit 1
+
+RESOLV_CONF="/etc/resolv.conf"
+[ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
+[ -n "$subnet" ] && NETMASK="netmask $subnet"
+
+case "$1" in
+        deconfig)
+                /sbin/ifconfig $interface 0.0.0.0
+                ;;
+
+        renew|bound)
+                /sbin/ifconfig $interface up
+                /sbin/ifconfig $interface $ip $BROADCAST $NETMASK
+
+                if [ -n "$router" ] ; then
+                        echo "deleting routers"
+                        while route del default gw 0.0.0.0 dev $interface ; do
+                                :
+                        done
+
+                        metric=0
+                        for i in $router ; do
+                                route add default gw $i dev $interface metric $((metric++))
+                        done
+                fi
+
+                echo -n > $RESOLV_CONF
+                [ -n "$domain" ] && echo search $domain >> $RESOLV_CONF
+                for i in $dns ; do
+                        echo adding dns $i
+                        echo nameserver $i >> $RESOLV_CONF
+                done
+                ;;
+esac
+
+exit 0
+