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
# Test for changeset 9fe267f77f56ff127cf7e65dc15dd9de71ce8ceb
# (merge correctly when all the files in a directory are moved
# but then local changes are added in the same directory)
hg init a
cd a
mkdir -p testdir
echo a > testdir/a
hg add testdir/a
hg commit -d '1000000 0' -m a
cd ..
hg clone a b
cd a
echo alpha > testdir/a
hg commit -d '1000000 0' -m remote-change
cd ..
cd b
mkdir testdir/subdir
hg mv testdir/a testdir/subdir/a
hg commit -d '1000000 0' -m move
mkdir newdir
echo beta > newdir/beta
hg add newdir/beta
hg commit -d '1000000 0' -m local-addition
hg pull ../a
hg up -C 2
hg merge
hg stat
hg diff --nodates