[PATCH] Documentation: mention environment variables GIT_CONFIG_NO(GLOBAL|SYSTEM)

["Jan Krüger" <jk@jk.gs>]

The environment variables GIT_CONFIG_NOGLOBAL and GIT_CONFIG_NOSYSTEM
which have the opposite effect of the --global and --system switches to
git-config are completely undocumented. This mentions them in the
'files' and 'environment' sections of the manpage for git-config where
GIT_CONFIG is already mentioned.

Signed-off-by: Jan Krüger <jk@jk.gs>
---
 Documentation/git-config.txt |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/Documentation/git-config.txt b/Documentation/git-config.txt
index 543dd64..c3ea29c 100644
--- a/Documentation/git-config.txt
+++ b/Documentation/git-config.txt
@@ -210,6 +210,9 @@ variables. The '--global' and the '--system' options will limit the file used
 to the global or system-wide file respectively. The GIT_CONFIG environment
 variable has a similar effect, but you can specify any filename you want.
 
+You can also set the environment GIT_CONFIG_NOGLOBAL and GIT_CONFIG_NOSYSTEM
+to explicitly prevent git from falling back to global/system settings.
+
 
 ENVIRONMENT
 -----------
@@ -219,6 +222,14 @@ GIT_CONFIG::
 	Using the "--global" option forces this to ~/.gitconfig. Using the
 	"--system" option forces this to $(prefix)/etc/gitconfig.
 
+GIT_CONFIG_NOGLOBAL::
+	If set to true, do not use the global configuration file
+	in ~/.gitconfig.
+
+GIT_CONFIG_NOSYSTEM::
+	If set to true, do not use the system-wide configuration file in
+	/etc/gitconfig.
+
 See also <<FILES>>.
 
 
-- 
1.7.2.3.392.g02377.dirty