#!/bin/bash
# SPDX-License-Identifier: Apache-2.0
#
# Copyright (C) 2019 Daniel Borkmann <daniel@iogearbox.net>
# Copyright (C) 2019 Authors of Cilium

cherry_pick()
{
  REM="origin/master"
  CID=$1
  BRANCHES=`git branch -q -r --contains $CID $REM 2> /dev/null`
  if ! echo ${BRANCHES} | grep -q ".*master.*"; then
    echo "Commit $CID not in $REM!"
    exit 1
  fi
  TMPF=`mktemp cp.XXXXXX`
  FROM=`git show --pretty=email $CID | head -n 2 | grep "From: "`
  FULL_ID=`git show $CID | head -n 1 | cut -f 2 -d ' '`
  git format-patch -1 $FULL_ID --stdout | sed '/^$/Q' > $TMPF
  echo "" >> $TMPF
  echo "[ upstream commit $FULL_ID ]" >> $TMPF
  git format-patch -1 $FULL_ID --stdout | sed -n '/^$/,$p' >> $TMPF
  echo "Applying: $(git log -1 --oneline $FULL_ID)"
  git am --quiet -3 --signoff $TMPF
  rm $TMPF
}

main()
{
  for CID in "$@"; do
    cherry_pick "$CID"
  done
}

usage()
{
  cat <<-EOF
  usage: pw-backport <commit-id> [commit-id ...]
EOF
  exit
}

if [ $# -lt 1 ]; then
  usage
fi

main "$@"