hooks: sort any dictionaries set in the environment The actual order of dictionary items is implementation-defined in Python, and differs between CPython and PyPy. With this change, test-hooks.t passes with PyPy.

windows.rename: eliminate temp name race (issue2571) On Windows, os.rename reliably raises OSError with errno.EEXIST if the destination already exists (even on shares served by Samba). Windows does *not* silently overwrite the destination of a rename. So there is no need to first call os.path.exists on the chosen temp path. Trusting os.path.exists is actually harmful, since using it enables the following racy sequence of actions: 1) os.path.exists(temp) returns False 2) some evil other process creates a file with name temp 3) os.rename(dst, temp) now fails because temp has been taken Not using os.path.exists and directly trying os.rename(dst, temp) eliminates this race.

merge with stable

checknlink: use two testfiles (issue2543) Preventing file loss repository corruption (e.g. vanished changelog.i) when Mercurial pushes to repositories on Windows shares served by Samba. This is a workaround for Samba bug 7863, which is present in current latest stable Samba 3.5.6 and various prior versions down to 3.0.26a (the oldest one I tested). Of course this should be fixed in Samba, but there probably aren't that many other applications who use hardlinks that extensively and keep files open like Mercurial, so the pressure to fix this on Samba is probably not that high. And even if the Samba project should be able to fix their bug within a month or two, it will take quite some time until users upgrade their Samba installs.

help: correct documentation for branches keyword

notify: use util.ellipsis() to truncate long subject