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#! /bin/sh
set -euf
if test -e nag.hosts.ls; then
  echo "nag seems to run already... if not, then delete $workdir/nag.*, please"
  exit 23
fi

trap 'rm -f nag.hosts.ls nag.services.ls nag.patch' EXIT INT QUIT


# usage: git_pull_output_filter REPO_NAME
git_pull_output_filter() {
  sed -n 's/^ [0-9]\+ file change/'"$1"': &/p'
}


if ! test -d nag.hosts; then
    git clone "$hosts_repo" nag.hosts
else
    (cd nag.hosts && git pull) | git_pull_output_filter hosts
fi

if ! test -d nag.services; then
    git clone "$services_repo" nag.services
else
    (cd nag.services && git pull) | git_pull_output_filter services
fi


(cd nag.hosts && ls | sort) > nag.hosts.ls
(cd nag.services && ls | sort) > nag.services.ls

diff -u nag.hosts.ls nag.services.ls > nag.patch || :

missing_services=$(sed -n '1d;2d;s/^-\(.*\)/\1/p' nag.patch | tr '\n' ' ')
obsolete_services=$(sed -n '1d;2d;s/^+\(.*\)/\1/p' nag.patch | tr '\n' ' ')

if test "${inspect_services-false}" = true; then
  missing_owners=$(set +f; cd nag.services && grep '^owner:$' * | cut -d: -f1)
  missing_mailtos=$(set +f; cd nag.services && grep '^mailto:$' * | cut -d: -f1)
fi

nag_missing_services='missing services'
nag_obsolete_services='obsolete services'
nag_missing_owners='services with missing owner entry'
nag_missing_mailtos='services with missing mailto entry'

#
# output
#
did_nag=false
for i in \
    missing_services \
    obsolete_services \
    missing_owners \
    missing_mailtos
do
  eval "offenders=\${$i-}; nag_msg=\$nag_$i"
  if test -n "$offenders"; then
    echo $nag_msg: $offenders
    did_nag=true
  fi
done

# if asked directly, answer if there is nothing to nag about
if test $did_nag = false -a -n "${_from:-}";then
  echo "nothing to nag about"
fi