#!/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

	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 |

printf '# DONE!\n'

exit 0

# EOF.