chg: ignore HG_* in confighash
The environment variables `HG_*` are usually used by hooks. Unlike `HGPLAIN`
etc, they do not actually affect hg's behavior. So do not include them in
confighash.
This would avoid spawning an unbound number of chg server processes if
commit hook calls hg frequently.
--- a/mercurial/chgserver.py Tue Dec 13 20:53:40 2016 +0530
+++ b/mercurial/chgserver.py Wed Dec 14 02:17:59 2016 +0000
@@ -77,7 +77,7 @@
# sensitive environment variables affecting confighash
_envre = re.compile(r'''\A(?:
CHGHG
- |HG.*
+ |HG(?:[A-Z].*)?
|LANG(?:UAGE)?
|LC_.*
|LD_.*