setup: don't perform lazy initialization of repository state

Under some circumstances (bogus GIT_DIR value or the discovered gitdir
is '.git') 'setup_git_directory()' won't initialize key repository
state.  This leads to inconsistent state after running the setup code.
To account for this inconsistent state, lazy initialization is done once
a caller asks for the repository's gitdir or some other piece of
repository state.  This is confusing and can be error prone.

Instead let's tighten the expected outcome of 'setup_git_directory()'
and ensure that it initializes repository state in all cases that would
have been handled by lazy initialization.

This also lets us drop the requirement to have 'have_git_dir()' check if
the environment variable GIT_DIR was set as that will be handled by the
end of the setup code.

Signed-off-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 8 insertions, 9 deletions

diff --git a/environment.c b/environment.c
index d40b21fb72..a73b08f5d9 100644
--- a/environment.c
+++ b/environment.c
@@ -160,7 +160,7 @@ static char *git_path_from_env(const char *envvar, const char *git_dir,
 	return xstrdup(value);
 }
 
-static void setup_git_env(void)
+void setup_git_env(void)
 {
 	struct strbuf sb = STRBUF_INIT;
 	const char *gitfile;
@@ -205,28 +205,27 @@ int is_bare_repository(void)
 int have_git_dir(void)
 {
 	return startup_info->have_repository
-		|| git_dir
-		|| getenv(GIT_DIR_ENVIRONMENT);
+		|| git_dir;
 }
 
 const char *get_git_dir(void)
 {
 	if (!git_dir)
-		setup_git_env();
+		BUG("git environment hasn't been setup");
 	return git_dir;
 }
 
 const char *get_git_common_dir(void)
 {
 	if (!git_dir)
-		setup_git_env();
+		BUG("git environment hasn't been setup");
 	return git_common_dir;
 }
 
 const char *get_git_namespace(void)
 {
 	if (!namespace)
-		setup_git_env();
+		BUG("git environment hasn't been setup");
 	return namespace;
 }
 
@@ -276,7 +275,7 @@ const char *get_git_work_tree(void)
 char *get_object_directory(void)
 {
 	if (!git_object_dir)
-		setup_git_env();
+		BUG("git environment hasn't been setup");
 	return git_object_dir;
 }
 
@@ -316,14 +315,14 @@ int odb_pack_keep(const char *name)
 char *get_index_file(void)
 {
 	if (!git_index_file)
-		setup_git_env();
+		BUG("git environment hasn't been setup");
 	return git_index_file;
 }
 
 char *get_graft_file(void)
 {
 	if (!git_graft_file)
-		setup_git_env();
+		BUG("git environment hasn't been setup");
 	return git_graft_file;
 }