Add set_git_dir() function

With the function set_git_dir() you can reset the path that will
be used for git_path(), git_dir() and friends.

The responsibility to close files and throw away information from the
old git_dir lies with the caller.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/cache.h b/cache.h
index 98af53040d1e0274895237fdf6a3699b91bdb20f..e1f94cbade4574d496f965694f2a2e3e5c21027b 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -214,6 +214,7 @@ extern char *get_object_directory(void);
 extern char *get_refs_directory(void);
 extern char *get_index_file(void);
 extern char *get_graft_file(void);
+extern int set_git_dir(const char *path);
 
 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 

diff --git a/environment.c b/environment.c
index f83fb9e44806c03cde06eede7888a4dcb901c5c3..a571fae607d56fedc5353c5e8e0206fdc4e59c06 100644 (file)
--- a/environment.c
+++ b/environment.c
@@ -107,3 +107,11 @@ char *get_graft_file(void)
                setup_git_env();
        return git_graft_file;
 }
+
+int set_git_dir(const char *path)
+{
+       if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
+               return error("Could not set GIT_DIR to '%s'", path);
+       setup_git_env();
+       return 0;
+}