Mercurial > hg-stable
diff tests/hghave @ 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
author | Idan Kamara <idankk86@gmail.com> |
---|---|
date | Mon, 25 Jul 2011 15:03:02 +0300 |
parents | 2425a3536396 |
children | 53f37b24f26a |
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--- a/tests/hghave Sat Jul 23 12:29:52 2011 +0200 +++ b/tests/hghave Mon Jul 25 15:03:02 2011 +0300 @@ -101,6 +101,16 @@ def has_fifo(): return hasattr(os, "mkfifo") +def has_cacheable_fs(): + from mercurial import util + + fd, path = tempfile.mkstemp(prefix=tempprefix) + os.close(fd) + try: + return util.cachestat(path).cacheable() + finally: + os.remove(path) + def has_lsprof(): try: import _lsprof @@ -200,6 +210,7 @@ "baz": (has_baz, "GNU Arch baz client"), "bzr": (has_bzr, "Canonical's Bazaar client"), "bzr114": (has_bzr114, "Canonical's Bazaar client >= 1.14"), + "cacheable": (has_cacheable_fs, "cacheable filesystem"), "cvs": (has_cvs, "cvs client/server"), "darcs": (has_darcs, "darcs client"), "docutils": (has_docutils, "Docutils text processing library"),