localrepo: validate directories before creating any
There is no meaningful change in behavior because wdir would
already exist in the case where we raised RepoError. But I think
the code is easier to read if we do all validation first then
take actions with side-effects.
Differential Revision: https://phab.mercurial-scm.org/D4706
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
for software developers.
Basic install::
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
$ ./hg --version # should show the latest version
See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.