Changes in v2:
 * Fix a small nit in builtin/config.c that Jonathan pointed out.
 * Added two patches which ensure that the repository wide config is properly
   read by providing 'commondir' as a field in the 'config_options' struct.

Brandon Williams (6):
  config: create config.h
  config: remove git_config_iter
  config: don't include config.h by default
  config: don't implicitly use gitdir
  setup: teach discover_git_directory to respect the commondir
  config: respect commondir

--- interdiff with 'origin/bw/config-h'

diff --git a/builtin/config.c b/builtin/config.c
index 90f49a6ee..8b6e227c5 100644
--- a/builtin/config.c
+++ b/builtin/config.c
@@ -539,8 +539,10 @@ int cmd_config(int argc, const char **argv, const char 
*prefix)
                config_options.respect_includes = !given_config_source.file;
        else
                config_options.respect_includes = respect_includes_opt;
-       if (have_git_dir())
-               config_options.git_dir = get_git_common_dir();
+       if (!nongit) {
+               config_options.commondir = get_git_common_dir();
+               config_options.git_dir = get_git_dir();
+       }
 
        if (end_null) {
                term = '\0';
diff --git a/cache.h b/cache.h
index fd45b8c55..a4176436d 100644
--- a/cache.h
+++ b/cache.h
@@ -530,7 +530,8 @@ extern void setup_work_tree(void);
  * appended to gitdir. The return value is either NULL if no repository was
  * found, or pointing to the path inside gitdir's buffer.
  */
-extern const char *discover_git_directory(struct strbuf *gitdir);
+extern const char *discover_git_directory(struct strbuf *commondir,
+                                         struct strbuf *gitdir);
 extern const char *setup_git_directory_gently(int *);
 extern const char *setup_git_directory(void);
 extern char *prefix_path(const char *prefix, int len, const char *path);
diff --git a/config.c b/config.c
index 4e2842689..81151fb54 100644
--- a/config.c
+++ b/config.c
@@ -1544,8 +1544,8 @@ static int do_git_config_sequence(const struct 
config_options *opts,
        char *user_config = expand_user_path("~/.gitconfig", 0);
        char *repo_config;
 
-       if (opts->git_dir)
-               repo_config = mkpathdup("%s/config", opts->git_dir);
+       if (opts->commondir)
+               repo_config = mkpathdup("%s/config", opts->commondir);
        else
                repo_config = NULL;
 
@@ -1609,8 +1609,11 @@ static void git_config_raw(config_fn_t fn, void *data)
        struct config_options opts = {0};
 
        opts.respect_includes = 1;
-       if (have_git_dir())
-               opts.git_dir = get_git_common_dir();
+       if (have_git_dir()) {
+               opts.commondir = get_git_common_dir();
+               opts.git_dir = get_git_dir();
+       }
+
        if (git_config_with_options(fn, data, NULL, &opts) < 0)
                /*
                 * git_config_with_options() normally returns only
@@ -1652,11 +1655,13 @@ static void configset_iter(struct config_set *cs, 
config_fn_t fn, void *data)
 void read_early_config(config_fn_t cb, void *data)
 {
        struct config_options opts = {0};
-       struct strbuf buf = STRBUF_INIT;
+       struct strbuf commondir = STRBUF_INIT;
+       struct strbuf gitdir = STRBUF_INIT;
 
        opts.respect_includes = 1;
 
-       if (have_git_dir())
+       if (have_git_dir()) {
+               opts.commondir = get_git_common_dir();
                opts.git_dir = get_git_dir();
        /*
         * When setup_git_directory() was not yet asked to discover the
@@ -1666,12 +1671,15 @@ void read_early_config(config_fn_t cb, void *data)
         * notably, the current working directory is still the same after the
         * call).
         */
-       else if (discover_git_directory(&buf))
-               opts.git_dir = buf.buf;
+       } else if (discover_git_directory(&commondir, &gitdir)) {
+               opts.commondir = commondir.buf;
+               opts.git_dir = gitdir.buf;
+       }
 
        git_config_with_options(cb, data, NULL, &opts);
 
-       strbuf_release(&buf);
+       strbuf_release(&commondir);
+       strbuf_release(&gitdir);
 }
 
 static void git_config_check_init(void);
diff --git a/config.h b/config.h
index c70599bd5..63b92784c 100644
--- a/config.h
+++ b/config.h
@@ -30,6 +30,7 @@ enum config_origin_type {
 
 struct config_options {
        unsigned int respect_includes : 1;
+       const char *commondir;
        const char *git_dir;
 };
 
diff --git a/setup.c b/setup.c
index e99a82cbe..7bbb8736f 100644
--- a/setup.c
+++ b/setup.c
@@ -946,10 +946,12 @@ static enum discovery_result 
setup_git_directory_gently_1(struct strbuf *dir,
        }
 }
 
-const char *discover_git_directory(struct strbuf *gitdir)
+const char *discover_git_directory(struct strbuf *commondir,
+                                  struct strbuf *gitdir)
 {
        struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT;
        size_t gitdir_offset = gitdir->len, cwd_len;
+       size_t commondir_offset = commondir->len;
        struct repository_format candidate;
 
        if (strbuf_getcwd(&dir))
@@ -974,8 +976,10 @@ const char *discover_git_directory(struct strbuf *gitdir)
                strbuf_insert(gitdir, gitdir_offset, dir.buf, dir.len);
        }
 
+       get_common_dir(commondir, gitdir->buf + gitdir_offset);
+
        strbuf_reset(&dir);
-       strbuf_addf(&dir, "%s/config", gitdir->buf + gitdir_offset);
+       strbuf_addf(&dir, "%s/config", commondir->buf + commondir_offset);
        read_repository_format(&candidate, dir.buf);
        strbuf_release(&dir);
 
@@ -983,6 +987,7 @@ const char *discover_git_directory(struct strbuf *gitdir)
                warning("ignoring git dir '%s': %s",
                        gitdir->buf + gitdir_offset, err.buf);
                strbuf_release(&err);
+               strbuf_setlen(commondir, commondir_offset);
                return NULL;
        }

-- 
2.13.1.518.g3df882009-goog

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