hardlink: check directory's st_dev when copying files Previously, when copying a file, copyfiles will compare src's st_dev with dirname(dst)'s st_dev, to decide whether to enable hardlink or not. That could have issues on Linux's overlayfs, where stating directories could result in different st_dev from st_dev of stating files, even if both the directories and the files exist in the overlay's upperdir. This patch fixes it by checking dirname(src) instead. It's more consistent because we are checking directories for both src and dest. That fixes test-hardlinks.t running on common Docker setups.

hardlink: duplicate hardlink detection for copying files and directories A later patch will change one of them so they diverge.

hardlink: extract topic text logic of copyfiles The topic text shows whether it's "linking" or "copying", based on "hardlink" value. The function is extracted so a later patch can reuse it.

tests: add check to make sure summary works on Python 2

color: replace str() with pycompat.bytestr()

diff: slice over bytes to make sure conditions work normally Both of this are part of generating `hg diff` on python 3.

minirst: remove redundant _admonitions set As Yuya pointed out during a review a month ago, _admonitions and _admonitiontitles are largely redundant. With the last commit, they are exactly redundant. So, remove _admonitions and use _admonitiontitles.keys() instead.

minirst: remove "admonition" from _admonitions The "admonition" rst primitive is split into "specific" admonitions ("attention," "caution," etc) and the "generic" admonition ("admonition"). For more, see http://docutils.sourceforge.net/docs/ref/rst/directives.html#admonitions The _admonitions set and keys of the _admonitiontitles dict overlap exactly except _admonitions has an "admonition" entry. Nowhere in Mercurial is the "admonition" admonition directive used. Even if it were, it doesn't have a title, so it wouldn't be rendered correctly. So, let's remove "admonition" from the set of recognized admonition directives.