#!/bin/sh
#
# gsc-post-receive — Git post-receive hook to do gsc poking
#
# Copyright © 2014 martin f. krafft <madduck@madduck.net>
# Released under the terms of the Artistic Licence 2.0
#
set -eu

TEMPDIR=$(mktemp -d gsc.XXXXXXXXXX)
TRAPSIGNALS="0 1 2 3 4 5 6 7 8 10 11 12 13 14 15"
cleanup() { rm -rf "$TEMPDIR"; trap - $TRAPSIGNALS; }
trap cleanup $TRAPSIGNALS

if ! git show HEAD:.gsc/pokehosts 2>/dev/null > $TEMPDIR/pokehosts; then
  exit 0
fi
git show HEAD:.gsc/poke-key > $TEMPDIR/poke-key
git show HEAD:.gsc/ssh_known_hosts > $TEMPDIR/ssh_known_hosts

poke_host() {
  echo >&2 "*** Poking $1..."

  ssh -T -o ConnectTimeout=10 \
    -o ForwardAgent=no -o ForwardX11=no \
    -o PreferredAuthentications=publickey \
    -o IdentitiesOnly=yes \
    -o IdentityFile="$TEMPDIR/poke-key" \
    -o StrictHostKeyChecking=yes \
    -o UserKnownHostsFile=$TEMPDIR/ssh_known_hosts \
    $1 </dev/null | sed 's,^,    ,' >&2

  echo >&2 "*** Done poking $1."
}

while read target remainder; do
  # reserve the use of $remainder for now
  poke_host $target
done < $TEMPDIR/pokehosts