Add support for installing a new image on the Amazon AMI

- Check if installing on AWS EC2 platform via instance metadata.
- Configure GRUB correctly, so that boot messages are available
  via instance's console.
- Add init.d script to fetch user's EC2 public key during boot.

1 files changed, 114 insertions, 0 deletions

diff --git a/etc/init.d/ec2-fetch-ssh-public-key b/etc/init.d/ec2-fetch-ssh-public-key
new file mode 100644
index 00000000..05955f05
--- /dev/null
+++ b/etc/init.d/ec2-fetch-ssh-public-key
@@ -0,0 +1,114 @@
+#!/bin/bash
+### BEGIN INIT INFO
+# Provides:          ec2-fetch-ssh-public-key
+# Required-Start:    vyatta-router
+# Required-Stop:
+# Default-Start:     2 3 4 5
+# Default-Stop:
+# Short-Description: AWS EC2 instance init script to fetch and load ssh public key
+# Description:       Retrieve user's public ssh key from EC2 instance metadata
+#                    and load/set the key in config.boot
+### END INIT INFO
+
+# Author: hydrajump <wave@hydrajump.com>
+#
+# Based on http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/building-shared-amis.html#public-amis-install-credentials
+#          https://github.com/andsens/bootstrap-vz/blob/master/providers/ec2/assets/init.d/ec2-get-credentials
+
+. /lib/lsb/init-functions
+
+: ${vyatta_env:=/etc/default/vyatta}
+source $vyatta_env
+
+# Configuration commands
+SHELL_API=/bin/cli-shell-api
+COMMIT=/opt/vyatta/sbin/my_commit
+SAVE=/opt/vyatta/sbin/vyatta-save-config.pl
+LOADKEY=/opt/vyatta/sbin/vyatta-load-user-key.pl
+
+public_key_url=http://169.254.169.254/latest/meta-data/public-keys/0/openssh-key
+username='vyos'
+ssh_dir="/home/$username/.ssh"
+authorized_keys="$ssh_dir/authorized_keys"
+group='vyattacfg'
+
+# Obtain config session environment
+session_env=$($SHELL_API getSessionEnv $PPID)
+if [ $? -ne 0 ]; then
+    echo "An error occured while obtaining session environment!"
+    exit 0
+fi
+
+# Evaluate config environment string
+eval $session_env
+
+# Setup the config session
+$SHELL_API setupSession
+if [ $? -ne 0 ]; then
+    echo "An error occured while setting up the configuration session!"
+    exit 0
+fi
+
+load_ssh_public_key ()
+{
+    # Doesn't work.
+    # if [ -x $vyatta_sbindir/vyatta-load-user-key.pl ]; then
+    #     log_action_msg "Loaded ssh public key for user $username"
+    #     sg ${group} -c "$vyatta_sbindir/vyatta-load-user-key.pl $username $public_key"
+    # fi
+
+    # Do this instead
+    # Obtain session environment
+    # Evaluate environment string
+    # Setup the session
+    # Commit and save config change
+    # Tear down the session
+
+    log_action_msg "EC2: Loaded ssh public key for user $username"
+    $LOADKEY $username $public_key_url
+
+    # Commit and save to config.boot
+    $COMMIT
+    $SAVE
+}
+
+# Try to get the ssh public key from instance metadata
+log_action_msg "EC2: -----BEGIN FETCH SSH PUBLIC KEY-----"
+log_action_msg "EC2: Requesting ssh public key from EC2 instance metadata"
+public_key=`/usr/bin/curl --silent -f $public_key_url`
+if [ -n "$public_key" ]; then
+    log_action_msg "EC2: Downloaded ssh public key from EC2 instance metadata"
+    if [ ! -d $ssh_dir ]; then
+        mkdir -m 700 $ssh_dir
+        # chown $username:$username $ssh_dir
+    fi
+
+    # Check if the ssh public key is already loaded
+    if ! grep -s -q "$public_key" $authorized_keys; then
+        load_ssh_public_key
+        # chmod 600 $authorized_keys
+        # chown $username:$username $authorized_keys
+    else
+        log_action_msg "EC2: Already loaded ssh public key for user $username"
+    fi
+else
+    log_action_msg "
+    == WARNING ==
+    No ssh public key found!
+    If you launch an instance without specifying a keypair,
+    you can't connect to the instance.
+    Please terminate this instance and launch a new EC2 instance.
+
+    == IMPORTANT ==
+    Don't forget to create a keypair or select an existing one
+    before you launch the new instance"
+fi
+log_action_msg "EC2: -----END FETCH SSH PUBLIC KEY-----"
+
+# Tear down the config session
+$SHELL_API teardownSession
+if [ $? -ne 0 ]; then
+    echo "An error occured while tearing down the session!"
+    exit 0
+fi
+exit 0