tests: introduce hghave hardlinks Some tests can't be run on FAT filesystems because it doesn't support hardlinks. [ original upstream message ]

tests/hghave: test that the inotify unix socket actually can be created Inotify do not work on FAT filesystems. [ original upstream message ]

tests/hghave: test that a fifo actually can be created on the filesystem Some tests were failing on FAT filesystems. [ original upstream message ]

tests/hghave: consistently use dir='.', prefix=tempprefix for tempfiles Some feature tests were done in the wrong directory and could thus give the wrong result. [ original upstream message ]

tests/hghave: extract hghave.py hghave is degraded to a bare script, moving the functions to hghave.py so they can be shared later on. [ original upstream message ]

Merge with stable

tests: add missing trailing 'cd ..' Many tests didn't change back from subdirectories at the end of the tests ... and they don't have to. The missing 'cd ..' could always be added when another test case is added to the test file. This change do that tests (99.5%) consistently end up in $TESTDIR where they started, thus making it simpler to extend them or move them around. [ original upstream message ]

tests: convert some 'hghave symlink' to #if This will enable some tests for windows. [ original upstream message ]

tests: use the right directory for running hghave from run-tests.py [ original upstream message ]

tests: make .t tests stop immediately if a cd fails This prevents tests from escaping from TESTTMP as a consequence of a failing directory creation. [ original upstream message ]