view tests/test-install.t @ 14927:2aa3e07b2f07

posix, windows: introduce cachestat

This class contains a stat result, and possibly other file info to reliably
determine between two points in time whether a file has changed.

Uniquely identifying a file gives us that reliability because we either
atomic rename or append. So one of two will happen: the file 'id' will change,
or the size of the file will change.

posix implements it simply by calling os.stat() and checking if the result
has st_ino.

For now on Windows we always assume the path is uncacheable. This can be
improved on NTFS due to file IDs: http://msdn.microsoft.com/en-us/library/aa363788(v=vs.85).aspx

So we need to find out if a file path is on an NTFS drive, for that we have:

- GetVolumeInformation, which unfortunately only works with a root path (but is available on XP)
- GetVolumeInformationByHandleW, works on a full file path but requires Vista or higher

hg debuginstall
  $ hg debuginstall
  Checking encoding (ascii)...
  Checking installed modules (*/mercurial)... (glob)
  Checking templates...
  Checking commit editor...
  Checking username...
  No problems detected

hg debuginstall with no username
  $ HGUSER= hg debuginstall
  Checking encoding (ascii)...
  Checking installed modules (*/mercurial)... (glob)
  Checking templates...
  Checking commit editor...
  Checking username...
   no username supplied (see "hg help config")
   (specify a username in your configuration file)
  1 problems detected, please check your install!
  [1]