tests/test-relink

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

echo "[extensions]" >> $HGRCPATH
echo "relink=" >> $HGRCPATH

fix_path()
{
    tr '\\' /
}

cat > arelinked.py <<EOF
import sys, os
from mercurial import util
path1, path2 = sys.argv[1:3]
if util.samefile(path1, path2):
    print '%s == %s' % (path1, path2)
else:
    print '%s != %s' % (path1, path2)
EOF

echo '% create source repository'
hg init repo
cd repo
echo '[ui]' > .hg/hgrc
echo 'username= A. Foo <[e-mail]>' >> .hg/hgrc
echo a > a
echo b > b
hg ci -Am addfile
echo a >> a
echo a >> b
hg ci -Am changefiles
# Test files are read in binary mode
python -c "file('.hg/store/data/dummy.i', 'wb').write('a\r\nb\n')"
cd ..

echo '% clone and pull to break links'
hg clone --pull -r0 repo clone
cd clone
echo '[ui]' >> .hg/hgrc
echo 'username= A. Baz <[e-mail]>' >> .hg/hgrc
hg pull -q
echo b >> b
hg ci -m changeb
python -c "file('.hg/store/data/dummy.i', 'wb').write('a\nb\r\n')"

echo '% relink'
hg relink --debug | sed 's:relinking.*store:relinking .hg/store:g' \
    | fix_path
cd ..

echo '% check hardlinks'
python arelinked.py repo/.hg/store/data/a.i clone/.hg/store/data/a.i
python arelinked.py repo/.hg/store/data/b.i clone/.hg/store/data/b.i