tests/test-issue660

Fix dir-changed-to-file updates on clean workdir.

Workaround for dir-changed-to-file updates mentioned
in rev 7a64931e2d76 doesn't actually work since tests
introduced in mentioned changeset prevented dirstate
updates even if working directory updates succeded.

Make tests more relaxed for dirstate operations
not directly accessible from cli. See also issue660.

While here, move _dirs existance check from _decpath()
to _changepath() for unification.

#!/bin/sh
# http://www.selenic.com/mercurial/bts/issue660


hg init a
cd a
echo a > a
mkdir b
echo b > b/b
hg commit -A -m "a is file, b is dir"

echo % file replaced with directory

rm a
mkdir a
echo a > a/a

echo % should fail - would corrupt dirstate
hg add a/a 

echo % removing shadow
hg rm --after a

echo % should succeed - shadow removed
hg add a/a

echo % directory replaced with file

rm -r b
echo b > b

echo % should fail - would corrupt dirstate
hg add b

echo % removing shadow
hg rm --after b/b

echo % should succeed - shadow removed
hg add b

echo % look what we got
hg st

echo % revert reintroducing shadow - should fail
rm -r a b
hg revert b/b

echo % revert all - should succeed
hg revert --all
hg st

echo % addremove

rm -r a b
mkdir a
echo a > a/a
echo b > b

hg addremove
hg st

echo % commit
hg ci -A -m "a is dir, b is file"
hg st --all

echo % long directory replaced with file

mkdir d
mkdir d/d
echo d > d/d/d
hg commit -A -m "d is long directory"
rm -r d
echo d > d

echo % should fail - would corrupt dirstate
hg add d

echo % removing shadow
hg rm --after d/d/d

echo % should succeed - shadow removed
hg add d
hg ci -md

echo % update should work at least with clean workdir

rm -r a b d
hg up -r 0
hg st --all
rm -r a b
hg up -r 1
hg st --all

exit 0