#!/bin/sh
set -ex
base=$HOME/things/Adns/Cvs-Convert
cd $base
tmp=$base/tmp

rm -rf converted

if ! test -d $tmp/git-cvsi; then
	rm -rf tmp
	mkdir tmp
	git cvsimport -d `pwd`/cvs-repo -C tmp/git-cvsi.new -k -p --norc adns
	mv tmp/git-cvsi.new tmp/git-cvsi
fi
cd tmp

rsync -aH --delete git-cvsi/. adjust
cd adjust

abandonbranch () {
	local oldbranchname=$1
	local newtagname=$2
	git tag $newtagname $oldbranchname
	git branch -D $oldbranchname
}
ensurenotag () {
	local tagname=$1
	# these two together unconditionally delete the tag if it exists
	git tag -f $tagname master
	git tag -d $tagname
}
abandondatedbranch () {
	local date=$1
	local olddesc=$2
	local newdesc=$3
	if [ "x$newdesc" = x ]; then newdesc=$olddesc; fi
	abandonbranch branch-$date-$olddesc abandon.$date.$newdesc
	ensurenotag branchpoint-$date-$olddesc master
}

abandonbranch branch-rrtypenoenum abandon.1998-10-04.rrtypenoenum
abandondatedbranch 1999-04-10 mthread multithread
abandondatedbranch 1999-04-11 ipv6
abandondatedbranch 1999-04-11 pollfds

abandondatedbranch 1999-05-09 gplvslgpl

abandondatedbranch 2000-05-07 ipv6
abandonbranch branch-0-7-inftodebug abandon.2000-03-26.infotodebug-0.7

graftmergein () {
	local desc=$1
	local mergecommit=$2
	local branchname=branch-$desc
	mkdir -p .git/info
	local branchtip=`git rev-parse $branchname~0`
	local oldparents=`git-log -n1 --pretty=format:%P $mergecommit`
	cat <<END >>.git/info/grafts
$2 $oldparents $branchtip
END
	git branch -D $branchname
	ensurenotag  mergepoint-$desc
}

graftmergein logcallbackfn 741a795cdaa539b48f83afbc0ac8e471543b9bf6

xargs git tag -d <<END
tochiark-1998-11-08
fromchiark-1998-11-09
tochiark-1998-11-09-b
fromchiark-1998-11-14
tochiark-1998-11-15
tochiark-1998-11-17
fromchiark-1998-11-28
END

git checkout master
scr=git-to-cvs-conversion-script
cp $base/convert $scr
git add $scr
git commit -m "$scr: record the script

Record the script we used to convert the CVS repo to git"
git rm $scr
git commit -m "$scr: delete the script

We have in fact done the conversion and don't need the script any more."

cat >$tmp/msg-filter <<'FEND'
perl -ne '
		$out .= $_;
	END {
		if ($out =~ m/^\@\@/s &&
		    $out =~ m/^(?!-)(?:\+ )?[^\@ ].*$/m) {
			print $&, "\n\n" or die $!;
		}
		print $out or die $!;
	}
'
FEND
chmod +x $tmp/msg-filter

cat >$tmp/tree-filter <<'FEND'
	set -e
	if test -f GPL-vs-LGPL; then
		cat <<'END' GPL-vs-LGPL >GPL-vs-LGPL.new
NB that NO VERSIONS of this file have been released, and I do not
intend to publish this version.  If you get this file from a
work-in-progress or abandoned branch, old old version, in a version
control system (eg CVS or git) I definitely do not intend the licence
exceptions in it to apply - these were all drafts, as you should know
if you know what retrieving work in progress, old or abandoned
versions or branches means !

  - Ian Jackson, 29th April 2014.

END
		mv -f GPL-vs-LGPL.new GPL-vs-LGPL
	fi
	set +e
FEND
chmod +x $tmp/tree-filter

git-filter-branch --tree-filter $tmp/tree-filter --msg-filter $tmp/msg-filter \
	`git-show-ref | awk '{print $2}'`

git-show-ref | awk '{print $2}' | grep '^refs/original/' \
	| xargs -n1 git-update-ref -d

rm -rf $tmp/converted
mkdir $tmp/converted
cd $tmp/converted
git init
git fetch $tmp/adjust 'refs/*:refs/*'
git checkout master