subrepo: abort in hgsubrepo._get if the destination is obstructed
Before, we deleted foo when we determined that there were zero
changesets in the foo subrepo. Any files in foo was deleted too. We
now delete foo/.hg instead, and the normal checks in hg.clone will
then abort if there are untracked files in foo.
run only on case-insensitive filesystems, because collision check at
"hg update" is done only on case-insensitive filesystems
$ "$TESTDIR/hghave" icasefs || exit 80
setup repository, and target files
$ HGENCODING=cp932
$ export HGENCODING
$ hg init t
$ cd t
$ python << EOF
> names = ["\x83\x41", # cp932(0x83, 0x41='A'), UNICODE(0x30a2)
> "\x83\x5A", # cp932(0x83, 0x5A='Z'), UNICODE(0x30bb)
> "\x83\x61", # cp932(0x83, 0x61='a'), UNICODE(0x30c2)
> "\x83\x7A", # cp932(0x83, 0x7A='z'), UNICODE(0x30db)
> ]
> for num, name in zip(range(len(names)), names):
> # file for getting target filename of "hg add"
> f = file(str(num), 'w'); f.write(name); f.close()
> # target file of "hg add"
> f = file(name, 'w'); f.write(name); f.close()
> EOF
test filename collison check at "hg add"
$ hg add --config ui.portablefilenames=abort `cat 0`
$ hg add --config ui.portablefilenames=abort `cat 1`
$ hg add --config ui.portablefilenames=abort `cat 2`
$ hg add --config ui.portablefilenames=abort `cat 3`
$ hg status -a
A \x83A (esc)
A \x83Z (esc)
A \x83a (esc)
A \x83z (esc)
test filename collision check at "hg update"
$ hg commit -m 'revision 0'
$ hg update null
0 files updated, 0 files merged, 4 files removed, 0 files unresolved
$ hg update tip
4 files updated, 0 files merged, 0 files removed, 0 files unresolved