win32: split a utility function to obtain the volume out of getfstype()
This is only done on Windows because it's simple enough to call statfs() on
Unix. The goal is to display this in `hg debugfs`.
util: whitelist NTFS for hardlink creation (
issue4580)
win32: implement util.getfstype()
This will allow NTFS to be added to the hardlink whitelist, and resume creating
hardlinks in transactions (which was disabled globally in
07a92bbd02e5; see also
e5ce49a30146). I opted to report "cifs" for remote volumes because this shows
in `hg debugfs`, which also reports that hardlinks are supported for these
volumes. So being able to distinguish it from "unknown" seems useful.
The documentation [1] seems to indicate that SMB isn't supported by these
functions, but experimenting shows that mapped drives are reported as "NTFS" on
Windows 7. I don't have a second Windows machine, but instead shared a temp
directory on C:\. In this setup, both of the following were detected as 'cifs'
with the explicit GetDriveType() check:
Z:\repo>hg ci -A
C:\>hg -R \\hostname\temp\repo ci -A # (without Z:\ being mapped)
It looks like this is called 6 times to add and commit a single new file, so I'm
a little surprised this isn't cached.
[1] https://msdn.microsoft.com/en-us/library/windows/desktop/
aa364993(v=vs.85).aspx
util: move getfstype() to the platform modules
This makes room for implementing on Windows using ctypes.
largefiles: modernize how capabilities are added to the wire protocol
See
982f13bef503, which came well after this code was originally written.