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

source $(dirname $0)/lib.sh

usage()
{
  cat <<-EOF
  usage: pw-apply [-h] [-s SERIES] [-b MBOX] [-P] [-M]
                  [-a] [-3] [-N] [-e] [-T] [-u BRANCH-BASE]
                  -- [-C] [-a ACKEDBY] [-r REVIEWEDBY] [-t TESTEDBY]
EOF
  exit
}

mbox_from_url()
{
  curl $1 | gunzip -f -c > mbox.i
}

get_cover()
{
  cover_json=$(echo "$series_json" | jq '.cover_letter')
  link=$(echo "$cover_json" | jq -r '.mbox' )

  if [ "$link" == "null" ]; then
    return
  fi

  curl -s $link > cover.i
  cover_subject=$(echo -e "$cover_json" |
                    jq -r '.name' |
                    sed -e 's/\[.*\] *//')
  branch=$(echo -e "$cover_json" |
             jq -r '.name' |
             sed -e 's/ *\[.*\] *//g' |
             tr '[:upper:]' '[:lower:]' |
             tr -d '\n' |
             tr -cs '[:alnum:]_-' '-' |
             sed -e 's/^-*\(.*[^-]\)-*$/\1/g')
  cover_msgid=$(echo "$cover_json" | jq -r '.msgid' | tr -d '<>')
}

set_cover_tags()
{
  [ -z "$cover_tags" ] && return

  cover_json=$(echo "$series_json" | jq '.cover_letter')
  [ "$cover_json" == "null" ] && return

  clink=$(echo "$cover_json" | jq -r '.url')
  link=$(curl -s "$clink" | jq -r '.comments')
  [ "$link" == "null" ] && return

  tags=$(echo -e "$(curl -s $link | jq -r '.[].content')" |
	     sed -n '/^\(Ack\|Review\|Test\)ed-[Bb]y:/p')
  export ADD_TAGS="$tags"
}

clear_cover_tags()
{
    [ -z "$cover_tags" ] && return

    [ -n "$ADD_TAGS" ] && export ADD_TAGS=
}

accept_series()
{
  for patch in $(git pw series show $1 -f simple 2> /dev/null | \
                   sed -n '/^Patches/,$p' | \
                   sed -r 's/.* ([0-9]*) .*/\1/g')
  do
    echo "Accepting $patch:"
    git pw patch update --state accepted $patch -f simple 2> /dev/null
  done
  echo "Done, all accepted!"
  rm -f mbox.i
  exit
}

cover_from_url()
{
  curl -s $1 | gunzip -f -c > tmp.i
  series=`grep "href=\"/series" tmp.i|cut -d/ -f3|head -1`
  cover_url=`grep "href=\"/project/netdevbpf/cover" tmp.i|cut -d\" -f2`
  if [ -z "$cover_url" ]; then
    merge=
  fi
}

auto_branch="1"
edits=""
am_flags=""
series=""
accept=""
merge="1"
no_merge=""
mbox=""
cover=""
cover_tags="y"
mb2q_normalize="y"
head_old=$(git rev-parse --verify HEAD)
base=""
min_age=24
while true; do
  case "$1" in
    -3 ) am_flags="$am_flags -3"; shift ;;
    -s | --series ) series="$2"; shift 2 ;;
    -a | --accept ) accept="1"; shift ;;
    -e | --do-edits ) edits="1"; shift ;;
    -N | --no-mb2q ) mb2q_normalize=""; am_flags="$am_flags -s"; shift ;;
    -P | --no-merge ) no_merge="1"; shift ;;
    -m | --min-age ) min_age="$2"; shift ;;
    -M | --manual-merge) auto_branch=""; shift ;;
    -b | --mbox ) mbox="$2"; shift 2 ;;
    -u | --upstream-base ) base="$2"; shift 2 ;;
    -c | --cover) cover="$2"; shift 2 ;;
    -T | --no-cover-tags) cover_tags=""; shift ;;
    -h | --help ) usage; break ;;
    -- ) shift; break ;;
    * )  break ;;
  esac
done
# Load the info from cover first, it may will populate $series and $merge
[ ! -z "$cover" ]  && cover_from_url $cover

[ ! -z "$auto_branch" ] && [ -z "$series" ] && usage
[ ! -z "$mbox" ]   && [ ! -z "$series" ] && usage
[   -z "$mbox" ]   && [   -z "$series" ] && [ -z "$cover" ] && usage
[ ! -z "$accept" ] && [ ! -z "$mbox" ]   && usage
[ ! -z "$series" ] && mbox_from_series $series $min_age
[ ! -z "$mbox" ]   && mbox_from_url $mbox
[ ! -z "$accept" ] && accept_series $series
[ ! -z "$no_merge" ] && merge=

target=$(git branch --show-current)
branch="mbox"

body=
author=XYZ
if [ ! -z "$auto_branch" ]; then
    get_cover
    set_cover_tags
    [ -z "$cover_msgid" ] && merge=
fi

if [ ! -z "$auto_branch" -a ! -z "$cover_msgid" ]; then
  body=$(cat cover.i |
           awk 'BEGIN {h=1;t=0}
                /^[A-Za-z. ]* \([0-9]+\):$/   {t=1}
                //                            {if (!h && !t) print}
                /^$/                          {h=0} ')
  author=$(cat cover.i |
             sed -n 's/^From: ['"'"'"]\?\([A-Za-z. -]*[a-z]\).*$/\1/p' |
             tail -1)
fi

git checkout -b $branch $base

if [ ! -z "$mb2q_normalize" ]; then
  mb2q --mboxout mbox.o "$@" mbox.i
else
  cp mbox.i mbox.o
fi

if [ -z "$merge" ]; then
  flags=$am_flags
  # When running without mb2q ask git-am for msgid, and have a git hook
  # transform that into a lore Link.
  [ -z "$mb2q_normalize" ] && flags="$flags -m"
  git am $flags mbox.o
else
  git am $am_flags mbox.o
  if [ ! -z "$edits" ] ; then
    git rebase -i "${base:-$target}"
  fi
  while [ -d .git/rebase-merge ]; do
    echo -ne "\rWaiting for rebase to finish $(date)"
    sleep 0.5
  done
  echo
fi
git checkout "$target"
if [ ! -z "$merge" ]; then
  git merge --stat --log --no-edit --no-ff $branch
  git commit --amend --signoff -F- <<EOF
Merge branch '$branch'

$author says:

====================
$cover_subject

$body
====================

Link: https://lore.kernel.org/r/$cover_msgid
EOF
else
  git merge --stat --ff $branch
fi
git branch -d $branch
rm -f mbox.i mbox.o tmp.i cover.i
head_new=$(git rev-parse --verify HEAD)
pw-check -s $head_old -e $head_new
if [ ! -z "$merge" ]; then
  if [ -z "$edits" ] ; then
    echo "Edit merge commit via: git commit --amend"
  else
    git commit --amend
  fi
fi

clear_cover_tags
exit 0