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#!/bin/bash
#
# Git post-receive hook to update Patchwork patches after Git pushes
#
# Copyright © 2010 martin f. krafft <madduck@madduck.net>
# Released under the terms of the Artistic Licence 2.0
#
set -eu

#TODO: the state map should really live in the repo's git-config
STATE_MAP="refs/heads/master:Accepted"

PWDIR=/srv/patchwork/apps/patchwork

do_exit=0
trap "do_exit=1" INT

get_patchwork_hash()
{
  local hash
  hash=$(git show $1 | python $PWDIR/parser.py --hash)
  echo $hash
  test -n "$hash"
}

get_patch_id()
{
  local id
  id=$($PWDIR/bin/pwclient view -h $1 2>/dev/null \
    | sed -rne 's,X-Patchwork-Id: ,,p')
  echo $id
  test -n "$id"
}

set_patch_state()
{
  $PWDIR/bin/pwclient update -s $2 -c $3 $1 2>&1
}

update_patches()
{
  local cnt; cnt=0
  for rev in $(git rev-list --no-merges --reverse ${1}^..${2}); do
    if [ "$do_exit" = 1 ]; then
      echo "I: exiting..." >&2
      break
    fi
    hash=$(get_patchwork_hash $rev) \
      || { echo "E: failed to hash rev $rev." >&2; continue; }
    id=$(get_patch_id $hash) \
      || { echo "E: failed to find patch for rev $rev." >&2; continue; }
    reason="$(set_patch_state $id $3 $rev)" \
      || { echo "E: failed to update patch #$id${reason:+: $reason}." >&2; continue; }
    echo "I: patch #$id updated using rev $rev." >&2
    cnt=$(($cnt + 1))
  done
  echo "I: $cnt patch(es) updated to state $3." >&2
}

while read oldrev newrev refname; do
  found=0
  for i in $STATE_MAP; do
    key="${i%:*}"
    if [ "$key" = "$refname" ]; then
      update_patches $oldrev $newrev ${i#*:}
      found=1
      break
    fi
  done
  if [ $found -eq 0 ]; then
    echo "E: no mapping for refname $key" >&2
  fi
done