#!/bin/bash

# Copyright (c) 2012 Peter Palfrader
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

usage() {
  echo >&2 "Usage: $0 <component>"
  exit 1
}

componentlist=/etc/static-components.conf
. /etc/staticsync.conf
if ! [ -n "$staticuser" ]; then
  echo >&2 "staticuser not configured!"
  exit 1
fi

if [ "$#" = 1 ]; then
  component="$1"
else
  usage
fi


if [ "${component%/*}" != "$component" ] ; then
  echo >&2 "$0: Invalid component: $component";
  exit 1
fi

thishost=$(hostname -f)
masterhost="$(awk -v component="$component" '!/^ *(#|$)/ && $2 == component {print $1; exit}' "$componentlist")"
srchost="$(awk -v component="$component" '!/^ *(#|$)/ && $2 == component {print $3; exit}' "$componentlist")"
srcdir="$(awk -v component="$component" '!/^ *(#|$)/ && $2 == component {print $4; exit}' "$componentlist")"
inextralist="$(
               awk -v component="$component" -v host="$thishost" '
                 !/^ *(#|$)/ && $2 == component {
                   split($5,extra,",")
                   for (i in extra) {
                     if (host == extra[i]) {
                       printf "%s:%s\n", $3, $4
                       exit
                     }
                   }
                   exit
                 }' "$componentlist"
              )"
if [ -z "$srchost" ] || [ -z "$srcdir" ]; then
  echo >&2 "$0: Invalid component: $component (not found in $componentlist)";
  exit 1
fi

if ! [ "$srchost" = "$thishost" ] && [ -z "$inextralist" ]; then
  echo >&2 "Component $component is sourced from $srchost, and this host is neither that nor in the extra allowed list."
  exit 1
fi

if [ "$srchost" = "$thishost" ] && ! [ -d "$srcdir" ]; then
  echo >&2 "Component source directory $srcdir does not exist or is not a directory, or is not accessible."
  exit 1
fi

if [ "`id -nu`" != "$staticuser" ]; then
  sudo -u "$staticuser" static-update-component "$@"
else
  ssh -t -t -o ServerAliveInterval=300 -o PreferredAuthentications=publickey "$masterhost" static-master-update-component "$component"
fi

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