chmod: create a new file when flags are set on a hardlinked file
For performance reasons we have several repositories where the files in the working
directory of 1 repo are hardlinks to the files of the other repo
When an update in one repo results in a chmod of a such a file, the hardlink
has to be deleted and replaced by a regular file to make sure that the change
does not happen in the other repo
#if no-windows no-osx
$ mkdir -p xdgconf/hg
$ echo '[ui]' > xdgconf/hg/hgrc
$ echo 'username = foobar' >> xdgconf/hg/hgrc
$ XDG_CONFIG_HOME="`pwd`/xdgconf" ; export XDG_CONFIG_HOME
$ unset HGRCPATH
$ hg config ui.username 2>/dev/null
foobar
#endif