Support for extracting configuration from different files

Add $GIT_CONFIG environment variable whose content is used instead
of .git/config if set. Also add $GIT_CONFIG_LOCAL as a
forward-compatibility cue for whenever we will finally come to support]
global configuration files (properly).

Signed-off-by: Petr Baudis <pasky@suse.cz>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/Documentation/git-repo-config.txt b/Documentation/git-repo-config.txt
index d5142e0dcd6799b8a94c9cd5a3f2bd17c3cb7289..803c0d5cae6db0a953380adc6ee3980a0afa72e0 100644 (file)
--- a/Documentation/git-repo-config.txt
+++ b/Documentation/git-repo-config.txt
@@ -73,6 +73,18 @@ OPTIONS
        List all variables set in .git/config.
 
 
+ENVIRONMENT
+-----------
+
+GIT_CONFIG::
+       Take the configuration from the given file instead of .git/config.
+
+GIT_CONFIG_LOCAL::
+       Currently the same as $GIT_CONFIG; when Git will support global
+       configuration files, this will cause it to take the configuration
+       from the global configuration file in addition to the given file.
+
+
 EXAMPLE
 -------
 

diff --git a/config.c b/config.c
index 984c75f5dd06bd1d53eda206a2b57eea093dfd58..d46eb6d8293766c2c188a1f89891329e4db06d93 100644 (file)
--- a/config.c
+++ b/config.c
@@ -317,7 +317,17 @@ int git_config_from_file(config_fn_t fn, const char *filename)
 
 int git_config(config_fn_t fn)
 {
-       return git_config_from_file(fn, git_path("config"));
+       const char *filename = git_path("config");
+       /* Forward-compatibility cue: $GIT_CONFIG makes git read _only_
+        * the given config file, $GIT_CONFIG_LOCAL will make it process
+        * it in addition to the global config file, the same way it would
+        * the per-repository config file otherwise. */
+       if (getenv("GIT_CONFIG")) {
+               filename = getenv("GIT_CONFIG");
+       } else if (getenv("GIT_CONFIG_LOCAL")) {
+               filename = getenv("GIT_CONFIG_LOCAL");
+       }
+       return git_config_from_file(fn, filename);
 }
 
 /*