tests/test-dumprevlog

verify: fix "missing revlog!" errors for revlog format v0 and add test

With revlog format v0 the .d files are empty if the only revision stored is an
empty file. Since Mercurial can no longer create format v0 repositories, but
still use it, add a script which creates a repository with a single empty file.
This can be used in other tests if wanted.

#!/bin/sh

CONTRIBDIR=$TESTDIR/../contrib

echo % prepare repo-a
mkdir repo-a
cd repo-a
hg init

echo this is file a > a
hg add a
hg commit -m first

echo adding to file a >> a
hg commit -m second

echo adding more to file a >> a
hg commit -m third

hg verify

echo
echo % dumping revlog of file a to stdout
python $CONTRIBDIR/dumprevlog .hg/store/data/a.i
echo % dumprevlog done

echo
echo % dump all revlogs to file repo.dump
find .hg/store -name "*.i" | sort | xargs python $CONTRIBDIR/dumprevlog > ../repo.dump

cd ..

mkdir repo-b
cd repo-b
hg init

echo
echo % undumping into repo-b
python $CONTRIBDIR/undumprevlog < ../repo.dump
echo % undumping done

cd ..

echo
echo % clone --pull repo-b repo-c  to rebuild fncache
hg clone --pull -U repo-b repo-c

cd repo-c

echo
echo % verify repo-c
hg verify

cd ..

echo
echo % comparing repos
hg -R repo-c incoming repo-a
hg -R repo-a incoming repo-c

exit 0