#!/bin/bash
#
# Git post-receive hook to update Patchwork patches after Git pushes
#
# Copyright © 2010 martin f. krafft <madduck@madduck.net>
# Released under the GNU General Public License v2 or later.
set -eu

#TODO: the state map should really live in the repo's git-config
STATE_MAP="refs/heads/master:Accepted"
#
# ignore all commits already present in these refs
# e.g.,
#   EXCLUDE="refs/heads/upstream refs/heads/other-project"
#
EXCLUDE=""
PWDIR=/home/oe-patchwork/patchwork/patchwork

if [ -d "$PWDIR" ]; then
        if [ ! -w "$PWDIR" ]; then
                echo "E: Post-receive hook has no write permissions in patchwork path." >&2
                exit 1
        fi
else
        echo "E: Invalid patchwork path in post-receive hook" >&2
        exit 1
fi

do_exit=0
trap "do_exit=1" INT

# Create a folder for the post-receive hook logs
ERR_LOG_FILE=$PWDIR/post-receive_logs/post_receive.log
if [ ! -f "$ERR_LOG_FILE" ]; then
    mkdir -p "`dirname \"$ERR_LOG_FILE\"`" 2>/dev/null
fi

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 info -h $1 2>>$ERR_LOG_FILE \
    | sed -rne 's,- id[[:space:]]*: ,,p')
  echo $id
  test -n "$id"
}

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

update_patches()
{
  local cnt; cnt=0
  for rev in $(git rev-parse --not ${EXCLUDE} |
               git rev-list --stdin --no-merges --reverse ${1}..${2}); do
    if [ X"$do_exit" = X"1" ]; then
      echo "$(date) I: exiting..." >> $ERR_LOG_FILE 2>/dev/null
      break
    fi
    hash=$(get_patchwork_hash $rev) \
      || { echo "$(date) E: failed to hash rev $rev." >> $ERR_LOG_FILE 2>/dev/null; continue; }
    id=$(get_patch_id $hash) \
      || { echo "$(date) E: failed to find patch for rev $rev." >> $ERR_LOG_FILE 2>/dev/null; continue; }
    reason="$(set_patch_state $id $3 $rev)" \
      || { echo "$(date) E: failed to update patch ID-$id${reason:+: $reason}." >> $ERR_LOG_FILE- 2>/dev/null; continue; }
    echo "$(date) I: patch ID-$id was succesfully updated to status $3 using commit $rev." >> $ERR_LOG_FILE 2>/dev/null
    cnt=$(($cnt + 1))
  done
  echo "$(date) I: $cnt patch(es) updated to state $3." >> $ERR_LOG_FILE 2>/dev/null
}

while read oldrev newrev refname; do
  found=0
  for i in $STATE_MAP; do
    key="${i%:*}"
    if [ "$key" = "$refname" ]; then
          echo "$(date) I: Started patch-update attempt using commit $newrev." >> $ERR_LOG_FILE 2>/dev/null
      update_patches $oldrev $newrev ${i#*:} >&- 2>&- &
      found=1
      break
    fi
  done
  if [ $found -eq 0 ]; then
    echo "$(date) E: STATE_MAP has no mapping for branch $refname" >> $ERR_LOG_FILE 2>/dev/null
  fi
done