# HG changeset patch
# User Martin von Zweigbergk <martinvonz@google.com>
# Date 2019-04-03 23:03:41
# Node ID edbcf5b239f9482b839e0212bc306b7ddbe175b7
# Parent  91cc8dc866ed57c922fb0c4f8e364794e3c6bd94

config: read configs from directories in lexicographical order

Mercurial currently reads the .rc files specified in HGRCPATH (and the
system-default paths) in directory order, which is unspecified. My
team at work maintains a set of .rc files. So far there has been no
overlap between them, so we had not noticed this behavior. However, we
would now like to release some common .rc files and then have another
one per plaform with platform-specific overrides. It would be nice if
we can determine the load order by choosing names carefully. This
patch enables that by loading the .rc files in lexicographical order.

Before this patch, the added test case would consistently say "30" on
my file system (whatever I have -- some Linux FS).

Differential Revision: https://phab.mercurial-scm.org/D6193

diff --git a/mercurial/rcutil.py b/mercurial/rcutil.py
--- a/mercurial/rcutil.py
+++ b/mercurial/rcutil.py
@@ -29,7 +29,8 @@ def _expandrcpath(path):
     p = util.expandpath(path)
     if os.path.isdir(p):
         join = os.path.join
-        return [join(p, f) for f, k in util.listdir(p) if f.endswith('.rc')]
+        return sorted(join(p, f) for f, k in util.listdir(p)
+                      if f.endswith('.rc'))
     return [p]
 
 def envrcitems(env=None):
diff --git a/tests/test-config.t b/tests/test-config.t
--- a/tests/test-config.t
+++ b/tests/test-config.t
@@ -211,3 +211,12 @@ alias has lower priority
   $ hg log --template '{author}\n'
   repo user
   $ cd ..
+
+configs should be read in lexicographical order
+
+  $ mkdir configs
+  $ for i in `$TESTDIR/seq.py 10 99`; do
+  >    printf "[section]\nkey=$i" > configs/$i.rc
+  > done
+  $ HGRCPATH=configs hg config section.key
+  99