[PATCH] mail: don't complain about a multi-word email.method config value

[Julien Cristau]

# HG changeset patch
# User Julien Cristau <jcristau at debian.org>
# Date 1575051591 -3600
#      Fri Nov 29 19:19:51 2019 +0100
# Node ID e962071e8bee30af8b3432e61b7f04acabbde0db
# Parent  640bae94f2f31b1c1325ad2e5cf7f4a5a9dbebdd
mail: don't complain about a multi-word email.method config value

I want to be able to set email.method to "ssh relay /usr/sbin/sendmail"
without needing an extra trivial shell script.
This works fine since we pass the full command to a shell, except for
validateconfig trying to find it in $PATH.

diff --git a/mercurial/mail.py b/mercurial/mail.py
--- a/mercurial/mail.py
+++ b/mercurial/mail.py
@@ -241,17 +241,18 @@ def validateconfig(ui):
         if not ui.config(b'smtp', b'host'):
             raise error.Abort(
                 _(
                     b'smtp specified as email transport, '
                     b'but no smtp host configured'
                 )
             )
     else:
-        if not procutil.findexe(method):
+        program = method.split(None, 1)[0]
+        if not procutil.findexe(program):
             raise error.Abort(
                 _(b'%r specified as email transport, but not in PATH') % method
             )
 
 
 def codec2iana(cs):
     # type: (str) -> str
     ''''''