Function discover_git_directory

setup.h:91–97

* Find the commondir and gitdir of the repository that contains the current * working directory, without changing the working directory or other global * state. The result is appended to commondir and gitdir. If the discovered * gitdir does not correspond to a worktree, then 'commondir' and 'gitdir' will * both have the same result appended to the buffer. The return value is * either 0 upon

 * either 0 upon success and -1 if no repository was found.
 */
static inline int discover_git_directory(struct strbuf *commondir,
					 struct strbuf *gitdir)
{
	if (discover_git_directory_reason(commondir, gitdir) <= 0)
		return -1;
	return 0;
}

void set_git_work_tree(struct repository *repo, const char *tree);