patch: move copyfile() into backends, abstract basedir

patch: merge makerejlines() into write_rej()

patch: extract fs access from patchfile into fsbackend Most filesystem calls are already isolated in patchfile but this is not enough: renames are performed before patchfile is available and some chmod calls are even done outside of the applydiff call. Once all these calls are extracted into a backend class, we can provide cleaner APIs to write to a working directory context directly into the repository.

mq: fix qpush changes detection of renamed files patch.changedfile() was not considering renamed file source as changed.

httpconnection: correctly handle redirects from http to https Previously the connection cache for keepalives didn't keep track of ssl. This meant that when we connected to an https server after that same server via http, both on the default port, we'd incorrectly reuse the non-https connection as the default port meant the connection cache key was the same.

win32.py: add argtypes and restype This is a feature of ctypes. Without these, pypy complains with RuntimeWarning: C function without declared arguments called RuntimeWarning: C function without declared return type called As a side effect of specifying restypes, the return value of e.g. CreateFileA is now implicitly converted to an instance of _HANDLE, so we also need to change the definition _INVALID_HANDLE_VALUE = -1 to _INVALID_HANDLE_VALUE = _HANDLE(-1).value Otherwise, tests for equality to _INVALID_HANDLE_VALUE in code like def _getfileinfo(name): fh = _kernel32.CreateFileA(name, 0, _FILE_SHARE_READ | _FILE_SHARE_WRITE | _FILE_SHARE_DELETE, None, _OPEN_EXISTING, 0, None) if fh == _INVALID_HANDLE_VALUE: _raiseoserror(name) would now fail to detect an invalid handle, which in turn would lead to exceptions raised with wrong errno values, like e.g. >>> nlinks('missing.txt') Traceback (most recent call last): ... OSError: [Errno 9] missing.txt: The handle is invalid. instead of the correct (as per this patch and before it) >>> nlinks('missing.txt') Traceback (most recent call last): ... OSError: [Errno 2] missing.txt: The system cannot find the file specified.