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#!/bin/sh
#
# Copyright (C) 2013  Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# This is a "morph deploy" configuration extension to fully configure
# a Trove instance at deployment time. It uses the following variables
# from the environment (see MUSTARD for a description of them):
#
#   * TROVE_ID
#   * TROVE_HOSTNAME (optional, defaults to TROVE_ID)
#   * TROVE_COMPANY
#   * LORRY_SSH_KEY
#   * UPSTREAM_TROVE
#   * UPSTREAM_TROVE_USER
#   * UPSTREAM_TROVE_EMAIL
#   * TROVE_ADMIN_USER
#   * TROVE_ADMIN_EMAIL
#   * TROVE_ADMIN_NAME
#   * TROVE_ADMIN_SSH_PUBKEY
#   * LORRY_CONTROLLER_MINIONS (optional, defaults to 4)
#
# The configuration of a Trove is slightly tricky: part of it has to
# be run on the configured system after it has booted. We accomplish
# this by copying in all the relevant data to the target system
# (in /var/lib/trove-setup), and creating a systemd unit file that
# runs on the first boot. The first boot will be detected by the
# existence of the /var/lib/trove-setup/needed file.

set -e

ROOT="$1"

if [ -z "$TROVE_HOSTNAME" ]
then
    export TROVE_HOSTNAME="$TROVE_ID"
fi

##########################################################################
# Configuration in /etc, which we need to do on all deployments.
##########################################################################

##########################################################################

lua_escape()
{
    echo -n "$1" | perl -pe 's/([-+\(\).%*?^$\[\]])/%$1/g'
}

echo "Creating /etc/trove-setup.sed"

cat <<EOF > "$ROOT"/etc/trove-setup.sed
s/##TROVE_HOSTNAME##/$TROVE_HOSTNAME/g
s/##MASON_HOST##/$MASON_ID/g
s/##MASON_PORT##/18755/g
s/##TROVE_TITLE##/$TROVE_ID/g
s/##TROVE_COMPANY##/$TROVE_COMPANY/g
s/##TROVE_LOG_PREFIX##/$TROVE_ID/g
s/##ESC_PERSONAL_PREFIX##/people/g
s/##PREFIX##/$TROVE_ID/g
s/##UPSTREAM_TROVE##/$UPSTREAM_TROVE/g
## The same prefix as above, only lua-pattern-escaped
s/##ESC_PREFIX##/$(lua_escape "$TROVE_ID")/g
EOF

##########################################################################

echo "Performing substitutions in /etc"

sed -f "$ROOT"/etc/trove-setup.sed -i \
    "$ROOT"/etc/cgitrc \
    "$ROOT"/etc/gitano-setup.clod \
    "$ROOT"/etc/lorry.conf \
    "$ROOT"/usr/share/gitano/skel/gitano-admin/*/*.lace \
    "$ROOT"/usr/share/gitano/skel/gitano-admin/*/*.lua \
    "$ROOT"/usr/share/gitano/skel/gitano-admin/users/*/user.conf \
    "$ROOT"/usr/share/trove-setup/releases-repo-migration.sh \
    "$ROOT"/usr/share/trove-setup/releases-repo-README \
    "$ROOT"/usr/lib/systemd/system/releases-repo-migration.service

##########################################################################

# trove-early-setup needs "localhost" to be defined, and there's no
# guarantee it's going to be in DNS, or that external networking is
# up when trove-early-setup runs. We work around this by creating
# /etc/hosts with the right line.
echo "Add localhost to /etc/hosts"
cat <<EOF >> "$ROOT/etc/hosts"
127.0.0.1 localhost
EOF

##########################################################################

# create a symlink in /var/www/htdocs to what will be the rsync area of
# the releases repository
echo "Symlink rsync releases in htdocs"
ln -s "/home/git/repos/$TROVE_ID/site/releases.git/rsync" \
    "$ROOT/var/www/htdocs/releases"


##########################################################################

echo "Create Lorry Controller config"
install -d "$ROOT/etc/lorry-controller"
cat <<EOF > "$ROOT/etc/lorry-controller/webapp.conf"
[config]
log = /home/lorry/webapp.log
log-max = 100M
log-keep = 10
log-level = debug
statedb = /home/lorry/webapp.db
configuration-directory = /home/lorry/confgit
status-html = /home/lorry/lc-status.html
wsgi = yes
debug-port = 12765
templates = /usr/share/lorry-controller/templates
confgit-url = ssh://git@localhost/$TROVE_ID/local-config/lorries
EOF


echo "Create MINION config"
cat <<EOF > "$ROOT/etc/lorry-controller/minion.conf"
[config]
log = syslog
log-level = debug
webapp-host = localhost
webapp-port = 12765
webapp-timeout = 3600
EOF


echo "Set up Lorry Controller MINIONs"
UNITS="$ROOT/usr/lib/systemd/system"
seq "${LORRY_CONTROLLER_MINIONS:-4}" |
while read i
do
    ln -s "../lorry-controller-minion@.service" \
        "$UNITS/multi-user.target.wants/lorry-controller-minion@$i.service"
done



##########################################################################
# Configuration of trove-early-setup
#
# We configure trove-early-setup so that it runs at first boot of an initial
# deployment, to do the parts of Trove system setup that require running
# commands from the deployed system.
##########################################################################

if [ "$UPGRADE" == "yes" ]; then
    echo "Not configuring trove-early-setup because this is an upgrade."
    exit 0
fi

echo "Create /var/lib/trove-setup"
install -d -o 0 -g 0 -m 0755 "$ROOT/var/lib/trove-setup"

echo "Create /etc/trove-setup.needed"
touch "$ROOT/etc/trove-setup.needed"
chown 0:0 "$ROOT/etc/trove-setup.needed"
chmod 0600 "$ROOT/etc/trove-setup.needed"

##########################################################################

# Put the lorry ssh keys onto the system. The trove-early-setup unit will
# put them into the right place for the lorry user upon first boot.
# We can't do that right now, because the lorry user won't exist until
# trove-early-setup has run.
echo "Copy Lorry ssh key to system"
install -m 0600 "$LORRY_SSH_KEY" "$ROOT/var/lib/trove-setup/lorry.key"
install -m 0644 "${LORRY_SSH_KEY}.pub" \
    "$ROOT/var/lib/trove-setup/lorry.key.pub"

##########################################################################

echo "Copy admin's ssh public key to system"
install -m 0644 "$TROVE_ADMIN_SSH_PUBKEY" \
    "$ROOT/var/lib/trove-setup/admin.key.pub"

##########################################################################

echo "Copy worker's ssh public key to system"
install -m 0644 "$WORKER_SSH_PUBKEY" \
    "$ROOT/var/lib/trove-setup/worker.key.pub"

##########################################################################

echo "Copy mason's ssh public key to system"
install -m 0644 "$MASON_SSH_PUBKEY" \
    "$ROOT/var/lib/trove-setup/mason.key.pub"

##########################################################################

if [ "x$MASON_DEFAULT_CI_HOSTS_FILE" = x ]; then
    echo "No default Mason hosts provided, using '[]'"
    printf '[\n]\n' >"$ROOT/var/lib/trove-setup/hosts.json.txt"
else
    echo "Copy default Mason host configuration to the System"
    install -m 0644 "$MASON_DEFAULT_CI_HOSTS_FILE" \
        "$ROOT/var/lib/trove-setup/hosts.json.txt"
fi

if [ "x$MASON_DEFAULT_CI_SYSTEMS_FILE" = x ]; then
    echo "No default Mason systems provided, using '[]'"
    printf '[\n]\n' >"$ROOT/var/lib/trove-setup/systems.json.txt"
else
    echo "Copy default Mason system configuration to the System"
    install -m 0644 "$MASON_DEFAULT_CI_SYSTEMS_FILE" \
        "$ROOT/var/lib/trove-setup/systems.json.txt"
fi

##########################################################################

echo "Create trove-early-setup unit file"
cat <<EOF > "$ROOT/etc/systemd/system/trove-early-setup.service"
[Unit]
Description=Run trove-early-setup (once)
Requires=network.target
After=network.target
Requires=opensshd.service
After=opensshd.service

# If there's a shared /var subvolume, it must be mounted before this
# unit runs.
Requires=local-fs.target
After=local-fs.target

ConditionPathExists=/etc/trove-setup.needed

# These must wait until we have created the required users on first boot.
# We reboot the machine after this unit completes so these lines are not
# strictly required, but it's nice to have a dependency graph that is true.
Before=lighttpd.service
Before=git-daemon.service


[Service]
Type=oneshot
ExecStart=/bin/sh -c 'ssh-keyscan localhost $UPSTREAM_TROVE> /etc/ssh/ssh_known_hosts'
ExecStart=/usr/bin/trove-early-setup
ExecStart=/usr/bin/install -m 0600 -o lorry -g lorry /var/lib/trove-setup/lorry.key /home/lorry/.ssh/id_rsa
ExecStart=/usr/bin/install -m 0644 -o lorry -g lorry /var/lib/trove-setup/lorry.key.pub /home/lorry/.ssh/id_rsa.pub
ExecStart=/bin/su git -c 'ssh git@localhost as lorry sshkey add configured < /var/lib/trove-setup/lorry.key.pub'
ExecStart=/bin/su git -c 'ssh git@localhost user add $TROVE_ADMIN_USER $TROVE_ADMIN_EMAIL $TROVE_ADMIN_NAME'
ExecStart=/bin/su git -c 'ssh git@localhost group adduser trove-admin $TROVE_ADMIN_USER'
ExecStart=/bin/su git -c 'ssh git@localhost as $TROVE_ADMIN_USER sshkey add default < /var/lib/trove-setup/admin.key.pub'
ExecStart=/bin/su git -c 'ssh git@localhost as distbuild sshkey add default < /var/lib/trove-setup/worker.key.pub'
ExecStart=/bin/su git -c 'ssh git@localhost as mason  sshkey add default < /var/lib/trove-setup/mason.key.pub'
ExecStart=/bin/mkdir -p /var/run/lighttpd/
ExecStart=/bin/chown cache:cache /var/run/lighttpd/
ExecStart=/bin/rm /etc/trove-setup.needed
ExecStart=/sbin/reboot
Restart=no
EOF

##########################################################################

ln -s "/etc/systemd/system/trove-early-setup.service" \
  "$ROOT/etc/systemd/system/multi-user.target.wants/trove-early-setup.service"