[PATCH 02/12] setup: remember whether repository was found

[Jonathan Nieder <jrnieder@gmail.com>]

From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>

As v1.7.2~16^2 (git --paginate: paginate external commands
again, 2010-07-14) explains, builtins (like git config) that
do not use RUN_SETUP are not finding GIT_DIR set correctly when
it is time to launch the pager from run_builtin().  If they
were to search for a repository sooner, then the outcome of such
early repository accesses would be more predictable and reliable.

The cmd_*() functions learn whether a repository was found through the
*nongit_ok return value from setup_git_directory_gently().  If
run_builtin() is to take care of the repository search itself, that
datum needs to be retrievable from somewhere else.  Use the
startup_info struct for this.

As a bonus, this information becomes available to functions such as
git_config() which might want to avoid trying to access a repository
when none is present.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
Tweaked the log message a bit.

 cache.h |    1 +
 setup.c |   12 +++++++++++-
 2 files changed, 12 insertions(+), 1 deletions(-)

diff --git a/cache.h b/cache.h
index 0822c3b..f9e82a8 100644
--- a/cache.h
+++ b/cache.h
@@ -1099,6 +1099,7 @@ int split_cmdline(char *cmdline, const char ***argv);
 
 /* git.c */
 struct startup_info {
+	int have_repository;
 };
 extern struct startup_info *startup_info;
 
diff --git a/setup.c b/setup.c
index 7e04602..1e32fb7 100644
--- a/setup.c
+++ b/setup.c
@@ -315,7 +315,7 @@ const char *read_gitfile_gently(const char *path)
  * We cannot decide in this function whether we are in the work tree or
  * not, since the config can only be read _after_ this function was called.
  */
-const char *setup_git_directory_gently(int *nongit_ok)
+static const char *setup_git_directory_gently_1(int *nongit_ok)
 {
 	const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
 	const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
@@ -470,6 +470,16 @@ const char *setup_git_directory_gently(int *nongit_ok)
 	return cwd + offset;
 }
 
+const char *setup_git_directory_gently(int *nongit_ok)
+{
+	const char *prefix;
+
+	prefix = setup_git_directory_gently_1(nongit_ok);
+	if (startup_info)
+		startup_info->have_repository = !nongit_ok || !*nongit_ok;
+	return prefix;
+}
+
 int git_config_perm(const char *var, const char *value)
 {
 	int i;
-- 
1.7.2.1.544.ga752d.dirty