chg: fix chg to work with py3.7+ "coercing" the locale...
chg: fix chg to work with py3.7+ "coercing" the locale
When the environment is empty (specifically: it doesn't contain LC_ALL,
LC_CTYPE, or LANG), Python will "coerce" the locale environment variables to be
a UTF-8 capable one. It sets LC_CTYPE in the environment, and this breaks chg,
since chg operates by:
- start hg, using whatever environment the user has when chg starts
- hg stores a hash of this "original" environment, but python has already set
LC_CTYPE even though the user doesn't have it in their environment
- chg calls setenv over the commandserver. This clears the environment inside of
hg and sets it to be exactly what the environment in chg is (without
LC_CTYPE).
- chg calls validate to ensure that the environment hg is using (after the
setenv call) is the one that the chg process has - if not, it is assumed the
user changed their environment and we should use a different server. This will
*never* be true in this situation because LC_CTYPE was removed.
Differential Revision:
https://phab.mercurial-scm.org/D7550
