[PATCH 2/3] Add setup_new_git_dir() function

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With the function setup_new_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@xxxxxx>
---
 cache.h       |    1 +
 environment.c |    8 ++++++++
 2 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/cache.h b/cache.h
index 98af530..bd58853 100644
--- 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 setup_new_git_dir(const char *path);
 
 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 
diff --git a/environment.c b/environment.c
index f83fb9e..264392b 100644
--- a/environment.c
+++ b/environment.c
@@ -107,3 +107,11 @@ char *get_graft_file(void)
 		setup_git_env();
 	return git_graft_file;
 }
+
+int setup_new_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;
+}
-- 
1.5.3.rc2.29.gc4640f

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