From 46c3cd44d7a1e8a33ad66c017ac9e3575cc88c00 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Sat, 5 Mar 2016 17:10:27 -0500 Subject: setup: make startup_info available everywhere Commit a60645f (setup: remember whether repository was found, 2010-08-05) introduced the startup_info structure, which records some parts of the setup_git_directory() process (notably, whether we actually found a repository or not). One of the uses of this data is for functions to behave appropriately based on whether we are in a repo. But the startup_info struct is just a pointer to storage provided by the main program, and the only program that sets it up is the git.c wrapper. Thus builtins have access to startup_info, but externally linked programs do not. Worse, library code which is accessible from both has to be careful about accessing startup_info. This can be used to trigger a die("BUG") via get_sha1(): $ git fast-import <<-\EOF tag foo from HEAD:./whatever EOF fatal: BUG: startup_info struct is not initialized. Obviously that's fairly nonsensical input to feed to fast-import, but we should never hit a die("BUG"). And there may be other ways to trigger it if other non-builtins resolve sha1s. So let's point the storage for startup_info to a static variable in setup.c, making it available to all users of the library code. We _could_ turn startup_info into a regular extern struct, but doing so would mean tweaking all of the existing use sites. So let's leave the pointer indirection in place. We can, however, drop any checks for NULL, as they will always be false (and likewise, we can drop the test covering this case, which was a rather artificial situation using one of the test-* programs). Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- setup.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'setup.c') diff --git a/setup.c b/setup.c index de1a2a7ea5..fa7a306287 100644 --- a/setup.c +++ b/setup.c @@ -7,6 +7,9 @@ static int inside_work_tree = -1; static int work_tree_config_is_bogus; static struct string_list unknown_extensions = STRING_LIST_INIT_DUP; +static struct startup_info the_startup_info; +struct startup_info *startup_info = &the_startup_info; + /* * The input parameter must contain an absolute path, and it must already be * normalized. @@ -905,10 +908,9 @@ const char *setup_git_directory_gently(int *nongit_ok) else setenv(GIT_PREFIX_ENVIRONMENT, "", 1); - if (startup_info) { - startup_info->have_repository = !nongit_ok || !*nongit_ok; - startup_info->prefix = prefix; - } + startup_info->have_repository = !nongit_ok || !*nongit_ok; + startup_info->prefix = prefix; + return prefix; } -- cgit v1.2.3