Earlier, we punted and simply assumed that we are in the top-level
directory of the project, and that there is no .git file but a .git/
directory so that we can read directly from .git/config.

However, that is not necessarily true. We may be in a subdirectory. Or
.git may be a gitfile. Or the environment variable GIT_DIR may be set.

To remedy this situation, we just refactored the way
setup_git_directory() discovers the .git/ directory, to make it
reusable, and more importantly, to leave all global variables and the
current working directory alone.

Let's discover the .git/ directory correctly in read_early_config() by
using that new function.

This fixes 4 known breakages in t7006.

Signed-off-by: Johannes Schindelin <johannes.schinde...@gmx.de>
---
 config.c         | 31 ++++++++++++-------------------
 t/t7006-pager.sh |  8 ++++----
 2 files changed, 16 insertions(+), 23 deletions(-)

diff --git a/config.c b/config.c
index fc4625a71dd..030acc50aa2 100644
--- a/config.c
+++ b/config.c
@@ -1505,34 +1505,27 @@ 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 strbuf buf = STRBUF_INIT;
+
        git_config_with_options(cb, data, NULL, 1);
 
        /*
-        * Note that this is a really dirty hack that does the wrong thing in
-        * many cases. The crux of the problem is that we cannot run
-        * setup_git_directory() early on in git's setup, so we have no idea if
-        * we are in a repository or not, and therefore are not sure whether
-        * and how to read repository-local config.
-        *
-        * So if we _aren't_ in a repository (or we are but we would reject its
-        * core.repositoryformatversion), we'll read whatever is in .git/config
-        * blindly. Similarly, if we _are_ in a repository, but not at the
-        * root, we'll fail to find .git/config (because it's really
-        * ../.git/config, etc), unless setup_git_directory() was already 
called.
-        * See t7006 for a complete set of failures.
-        *
-        * However, we have historically provided this hack because it does
-        * work some of the time (namely when you are at the top-level of a
-        * valid repository), and would rarely make things worse (i.e., you do
-        * not generally have a .git/config file sitting around).
+        * When setup_git_directory() was not yet asked to discover the
+        * GIT_DIR, we ask discover_git_directory() to figure out whether there
+        * is any repository config we should use (but unlike
+        * setup_git_directory_gently(), no global state is changed, most
+        * notably, the current working directory is still the same after the
+        * call).
         */
-       if (!have_git_dir()) {
+       if (!have_git_dir() && discover_git_directory(&buf)) {
                struct git_config_source repo_config;
 
                memset(&repo_config, 0, sizeof(repo_config));
-               repo_config.file = ".git/config";
+               strbuf_addstr(&buf, "/config");
+               repo_config.file = buf.buf;
                git_config_with_options(cb, data, &repo_config, 1);
        }
+       strbuf_release(&buf);
 }
 
 static void git_config_check_init(void);
diff --git a/t/t7006-pager.sh b/t/t7006-pager.sh
index 304ae06c600..4f3794d415e 100755
--- a/t/t7006-pager.sh
+++ b/t/t7006-pager.sh
@@ -360,19 +360,19 @@ test_pager_choices                       'git aliasedlog'
 test_default_pager        expect_success 'git -p aliasedlog'
 test_PAGER_overrides      expect_success 'git -p aliasedlog'
 test_core_pager_overrides expect_success 'git -p aliasedlog'
-test_core_pager_subdir    expect_failure 'git -p aliasedlog'
+test_core_pager_subdir    expect_success 'git -p aliasedlog'
 test_GIT_PAGER_overrides  expect_success 'git -p aliasedlog'
 
 test_default_pager        expect_success 'git -p true'
 test_PAGER_overrides      expect_success 'git -p true'
 test_core_pager_overrides expect_success 'git -p true'
-test_core_pager_subdir    expect_failure 'git -p true'
+test_core_pager_subdir    expect_success 'git -p true'
 test_GIT_PAGER_overrides  expect_success 'git -p true'
 
 test_default_pager        expect_success test_must_fail 'git -p request-pull'
 test_PAGER_overrides      expect_success test_must_fail 'git -p request-pull'
 test_core_pager_overrides expect_success test_must_fail 'git -p request-pull'
-test_core_pager_subdir    expect_failure test_must_fail 'git -p request-pull'
+test_core_pager_subdir    expect_success test_must_fail 'git -p request-pull'
 test_GIT_PAGER_overrides  expect_success test_must_fail 'git -p request-pull'
 
 test_default_pager        expect_success test_must_fail 'git -p'
@@ -380,7 +380,7 @@ test_PAGER_overrides      expect_success test_must_fail 
'git -p'
 test_local_config_ignored expect_failure test_must_fail 'git -p'
 test_GIT_PAGER_overrides  expect_success test_must_fail 'git -p'
 
-test_expect_failure TTY 'core.pager in repo config works and retains cwd' '
+test_expect_success TTY 'core.pager in repo config works and retains cwd' '
        sane_unset GIT_PAGER &&
        test_config core.pager "cat >cwd-retained" &&
        (
-- 
2.12.0.windows.1.7.g94dafc3b124


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