#!/bin/sh

#***************************************************************************
#                                  _   _ ____  _
#  Project                     ___| | | |  _ \| |
#                             / __| | | | |_) | |
#                            | (__| |_| |  _ <| |___
#                             \___|\___/|_| \_\_____|
#
# Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at https://curl.se/docs/copyright.html.
#
# You may opt to use, copy, modify, merge, publish, distribute and/or sell
# copies of the Software, and permit persons to whom the Software is
# furnished to do so, under the terms of the COPYING file.
#
# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
# KIND, either express or implied.
#
# SPDX-License-Identifier: curl
#
###########################################################################

# This script remakes a provided curl release and verifies that the newly
# built version is identical to the original file.
#
# Invoke in a clean directory with the release tarball file (stored in the
# same directory) as an argument for basic verification.
#
# For full verification: run the script in an up-to-date curl git repository.
#

set -eu

tarball="${1:-}"

if [ -z "$tarball" ]; then
  echo "Provide a curl release tarball name as argument"
  exit
fi

i="$(find . -maxdepth 1 -type d -name 'curl-*' | wc -l)"

if test "$i" -gt 1; then
  echo "multiple curl-* entries found, disambiguate please"
  exit
fi

# check if this is in a git clone directory

if git log -1 include/curl/curl.h 2>/dev/null >/dev/null; then
  echo "*** Detected a git checkout, do full verification"
  withgit=1
else
  echo "*** Lacking a full git checkout, do the lesser verification"
  withgit=0
fi

mkdir -p _tarballs
rm -rf _tarballs/*

# checksum the original tarball to compare with later
sha256sum "$tarball" >_tarballs/checksum

# extract version number from file name
tarver=$(echo "$tarball" | sed 's/curl-\([0-9.]*\)\..*/\1/')

# extract the version from the official header file
curlver=$(tar xOf "$tarball" "curl-$tarver/include/curl/curlver.h" | grep '#define LIBCURL_VERSION ' | sed 's/[^0-9.]//g')

if test "$tarver" != "$curlver"; then
  echo "Tarball file version ($tarver) mismatches contents of tarball ($curlver)"
  exit 1
fi

timestamp=$(tar xOf "$tarball" "curl-$tarver/docs/RELEASE-TOOLS.md" | grep 'SOURCE_DATE_EPOCH=' | sed 's/[^0-9.]//g')

if test "$withgit" = 0; then
  # without git

  # extract the release contents
  tar xf "$tarball"

  # move away the original tarball
  mv "$tarball" "_tarballs/orig-$tarball"

  pwd=$(pwd)
  cd "curl-$curlver"
  ./configure --without-ssl --without-libpsl
  ./scripts/dmaketgz "$curlver" "$timestamp"

  for f in "curl-$curlver.tar.gz" "curl-$curlver.tar.bz2" "curl-$curlver.tar.xz" "curl-$curlver.zip"; do
    mv "$f" ../_tarballs/
  done
  cd "$pwd"
else
  tag=$(tar xOf "$tarball" "curl-$tarver/docs/RELEASE-TOOLS.md" | grep 'tag/commit: curl-' | head -n 1 | sed 's/.*\(curl-[0-9_]*\).*/\1/')
  echo "*** Use git tag $tag"

  # move away the original tarball
  mv "$tarball" "_tarballs/orig-$tarball"

  prevtag=$(git symbolic-ref -q --short HEAD || git rev-parse HEAD)
  git checkout -f "$tag"

  ./scripts/dmaketgz "$curlver" "$timestamp"

  # switch back to where it was
  git checkout -f "$prevtag"

  for f in "curl-$curlver.tar.gz" "curl-$curlver.tar.bz2" "curl-$curlver.tar.xz" "curl-$curlver.zip"; do
    mv "$f" _tarballs/
  done
fi
cd "_tarballs"

# compare the new tarball against the original
sha256sum -c checksum