update

#!/bin/sh -eu
#
# s6-rc preprocessor and updater frontend
# Copyright © 2016 Samuel Holland <samuel@sholland.org>
# See LICENSE in the project directory for license terms.
# vim: expandtab:sts=2:sw=2:ts=8:tw=110
#

base=/etc/rc
date=$(TZ=UTC0 date +%Y%m%dT%H%M%SZ)
tmpdir=$(mktemp -d)
trap 'rm -rf "$tmpdir"' HUP INT QUIT TERM

for svcdir in "$base"/source/* ; do
  if test -r "$svcdir"/disabled ; then
    continue
  elif test -r "$svcdir"/contents ; then
    svcname=${svcdir##*/}
    outdir=${tmpdir}/${svcname}

    mkdir "$outdir"
    printf 'bundle\n' > "$outdir"/type

    while read -r member ; do
      if ! test -r "${base}/source/${member}"/disabled ; then
        printf '%s\n' "$member" >> "${outdir}/contents"
      fi
    done < "$svcdir"/contents
  elif test -r "$svcdir"/instances ; then
    svcname=${svcdir##*/}
    outdir=${tmpdir}/${svcname}

    mkdir "$outdir"
    printf 'bundle\n' > "$outdir"/type
    sed -e "s/^/${svcname}@/" -e "s@/@-@g" "$svcdir"/instances > "$outdir"/contents

    while read -r instance ; do
      outdir=${tmpdir}/${svcname}@$(echo "${instance}" | tr / -)

      cp -pR "$svcdir" "$outdir"
      find "$outdir" -type f -exec sed -i "s@%I@${instance}@g" {} +
    done < "$svcdir"/instances
  else
    cp -pR "$svcdir" "$tmpdir"
  fi
done

for svcdir in "$tmpdir"/* ; do
  if test -r "$svcdir"/logdir ; then
    svcname=${svcdir##*/}
    logname="${svcname}-log"
    outdir=${tmpdir}/${logname}
    logdir=/var/log/$(cat "$svcdir"/logdir)

    mkdir "$outdir"
    printf '%s\n' "$logname" > "${svcdir}/producer-for"
    printf '%s\n' "$svcname" > "${outdir}/consumer-for"
    printf 'filesystems\n' > "$outdir"/dependencies
    printf '3\n' > "$outdir"/notification-fd
    cat > "$outdir"/run << EOF
#!/bin/execlineb -P
if { install -d -m 0750 -o log -g log ${logdir} }
umask 027
s6-setuidgid log
s6-log -d3 -- !zstd t ${logdir}
EOF
    chmod +x "$outdir"/run
    printf 'longrun\n' > "$outdir"/type
  fi
done

if s6-rc-compile -h nobody "${base}/compiled.${date}" "$tmpdir"; then
  if test -d "${base}/compiled" ; then
    s6-rc-update "${base}/compiled.${date}"
  fi
  rm -rf "${base}/compiled"
  ln -fns "compiled.${date}" "${base}/compiled"
fi

rm -rf "$tmpdir"