diff mercurial/scmwindows.py @ 43951:1ccf340acf14

windows: add a global equivalent to /etc/mercurial for *.rc processing

This follows the Unix model of processing this directory immediately after
<internal>/*.rc, and prior to the installation relative files.  Since the Unix
processing supports both a directory and a file (the former overriding the
latter), and since %HOME% supports both `*.ini` and `.hgrc` (again, the former
overriding the latter), this does too.  The Unix file doesn't have a `.` prefix,
so it's not used here either.

Note that this is the opposite order of processing the exe relative paths.  But
since it's in agreement with Unix, %HOME% and %USERPROFILE%, it seems reasonable
to ignore that.  Maybe we can change that and take a BC, because that's
something the installer should be controlling, and I can't imagine people having
both paths *and* conflicting settings.

Differential Revision: https://phab.mercurial-scm.org/D7692

--- a/mercurial/scmwindows.py	Fri Dec 13 10:31:00 2019 -0800
+++ b/mercurial/scmwindows.py	Tue Dec 17 22:08:07 2019 -0500
@@ -38,6 +38,20 @@
     # Use hgrc.d found in directory with hg.exe
     _processdir(os.path.join(os.path.dirname(filename), b'hgrc.d'))
 
+    # treat a PROGRAMDATA directory as equivalent to /etc/mercurial
+    programdata = encoding.environ.get(b'PROGRAMDATA')
+    if programdata:
+        programdata = os.path.join(programdata, b'Mercurial')
+        _processdir(os.path.join(programdata, b'hgrc.d'))
+
+        ini = os.path.join(programdata, b'mercurial.ini')
+        if os.path.isfile(ini):
+            rcpath.append(ini)
+
+        ini = os.path.join(programdata, b'hgrc')
+        if os.path.isfile(ini):
+            rcpath.append(ini)
+
     # next look for a system rcpath in the registry
     value = util.lookupreg(
         b'SOFTWARE\\Mercurial', None, winreg.HKEY_LOCAL_MACHINE