#!/bin/ksh93

#
# merge Rauchs Subversion tree into our git,
# one patch at the time
#

set -o xtrace
set -o errexit
set -o pipefail

which bunzip2	|| exit 1
which git	|| exit 1
which realpath	|| exit 1
which svn	|| exit 1
which svnadmin	|| exit 1
which svnrdump	|| exit 1


builtin chmod	|| exit 1
#builtin ln	|| exit 1 # broken Debian ksh93 package config, grrr...
builtin mkdir	|| exit 1
builtin printf	|| exit 1
#builtin rm	|| exit 1 # broken Debian ksh93 package config, grrr...
builtin wc	|| exit 1


# clean data from previous run
rm -Rf gitsvnclone1 svnstore convertedsrc compare_oldnew


# squish locale settings, we need the POSIX defaults
if [[ "${!LC_*}" != '' ]] ; then
	unset "${!LC_@}"
fi
unset LANG
export LANG='POSIX'
 
typeset -r infile='rauch_svndump20200128.svndump.bz2'

typeset -r basedir="$PWD"
compound svninfo

[[ ! -f "${infile}" ]] && exit 1
[[ ! -r "${infile}" ]] && exit 1

# create empty SVN repository
svnadmin create svnstore
# add dummy hook to allow property changes for "svnrdump load"
printf '#!/bin/sh\nexit 0\n' >'svnstore/hooks/pre-revprop-change'
chmod a+x 'svnstore/hooks/pre-revprop-change'

bunzip2 -c <"${infile}" | svnrdump load "file://$basedir/svnstore/"

# get HEAD revision (number) from svn repository
integer svninfo.revision
svninfo.cmdout="$(svn info "file://$basedir/svnstore")"
dummy="${svninfo.cmdout/~(E)Revision:[[:space:]]+([[:digit:]]+)/ }"
(( svninfo.revision=.sh.match[1] ))

printf '# Subversion info:\n'
print -v svninfo

mkdir 'gitsvnclone1'
cd 'gitsvnclone1'
git svn clone "file://$basedir/svnstore"

ls -lad 'svnstore/trunk/projekt/ptxdist/'


cd 'svnstore/trunk/projekt/ptxdist/'

# extract all patches from git repository previously
# stored by "git svn" there
git format-patch -$(( svninfo.revision+1 ))

# remove patch files which are empty
(for i in *.patch ; do if [[ ! -s "$i" ]] ; then rm -- "$i" ; fi ; done)

# list remaining patches
IFS=$'\n' ; typeset -a patchlist=( $(ls -1ad $PWD/*.patch ) )
printf '\n#### Patches:\n'
printf '%q\n' "${patchlist[@]}"
printf '\n#### Number of patches: %d\n' "$(wc -l <<<"$patchlist")"

cd "$basedir"
mkdir 'convertedsrc'
cd 'convertedsrc'

printf '%s\n' "${patchlist[@]}" | sort -n | while read i ; do
	# 1. use "|| true" to circumvent -o errexit for now since
	# GNU patch does not support GIT binary patches and returns
	# a non-0 exit code for such patches
	# 2. use --force to avoid interactive queries about GIT binary patches
	patch -p3 --force <"$i" || true
done

cd "$basedir"
mkdir 'compare_oldnew'
cd 'compare_oldnew'
(mkdir 'old' && cd 'old' && svn export "file://$basedir/svnstore/trunk/projekt/ptxdist")
mkdir new
ln -s '../../convertedsrc/ptxdist' 'new/.'

cd "$basedir"
(diff -r -u 'compare_oldnew/old/ptxdist/' 'compare_oldnew/new/ptxdist/' || true) 2>&1 |
	egrep -v '^Only in compare_oldnew/old/.+: (ecu-jobctl-demo|barebox-image|bareboxenv|libEMC|lin|.+\.(app|png|jpg|jpeg|gz|bin|iop|pdf|so\.[[:digit:]]+.+|crc|vtg))$'


printf '# DONE!\n'
exit 0
# EOF.