c - git的入口点是什么？

Question

我正在浏览git源代码，我想知道入口点文件在哪里？我浏览了几个文件，我认为可以，但找不到主要功能。

Answer 1

我可能是错的，但我相信入口点是 common-main.c 中的 main()。

int main(int argc, const char **argv)
{
    /*
     * Always open file descriptors 0/1/2 to avoid clobbering files
     * in die().  It also avoids messing up when the pipes are dup'ed
     * onto stdin/stdout/stderr in the child processes we spawn.
     */
    sanitize_stdfds();

    git_setup_gettext();

    git_extract_argv0_path(argv[0]);

    restore_sigpipe_to_default();

    return cmd_main(argc, argv);
}

最后你可以看到它返回 cmd_main(argc, argv)。 cmd_main() 有很多定义，但我相信这里返回的是 git.c 中定义的那个，在这里贴出来有点长其全部内容，但摘录如下:

int cmd_main(int argc, const char **argv)
{
    const char *cmd;

    cmd = argv[0];
    if (!cmd)
        cmd = "git-help";
    else {
        const char *slash = find_last_dir_sep(cmd);
        if (slash)
            cmd = slash + 1;
    }

    /*
     * "git-xxxx" is the same as "git xxxx", but we obviously:
     *
     *  - cannot take flags in between the "git" and the "xxxx".
     *  - cannot execute it externally (since it would just do
     *    the same thing over again)
     *
     * So we just directly call the builtin handler, and die if
     * that one cannot handle it.
     */
    if (skip_prefix(cmd, "git-", &cmd)) {
        argv[0] = cmd;
        handle_builtin(argc, argv);
        die("cannot handle %s as a builtin", cmd);
    }

handle_builtin() 也在 git.c 中定义。