[PATCH v5 10/11] test-dump-untracked-cache: don't modify the untracked cache

[Christian Couder <christian.couder@gmail.com>]

To correctly perform its testing function,
test-dump-untracked-cache should not change the state of the
untracked cache in the index.

As a previous patch makes read_index_from() change the untracked
cache status and as test-dump-untracked-cache indirectly calls
this function, we need a mechanism to prevent read_index_from()
to change the untracked cache state when it's called from
test-dump-untracked-cache.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
---
 cache.h                     | 2 ++
 config.c                    | 3 +++
 environment.c               | 6 ++++++
 test-dump-untracked-cache.c | 2 ++
 4 files changed, 13 insertions(+)

diff --git a/cache.h b/cache.h
index 59a15fd..89c7e10 100644
--- a/cache.h
+++ b/cache.h
@@ -1605,6 +1605,8 @@ extern int git_config_get_maybe_bool(const char *key, int *dest);
 extern int git_config_get_pathname(const char *key, const char **dest);
 extern int git_config_get_untracked_cache(void);
 
+extern int ignore_untracked_cache_config;
+
 struct key_value_info {
 	const char *filename;
 	int linenr;
diff --git a/config.c b/config.c
index 647a15e..a4f70f7 100644
--- a/config.c
+++ b/config.c
@@ -1599,6 +1599,9 @@ int git_config_get_untracked_cache(void)
 	int val = -1;
 	const char *v;
 
+	if (ignore_untracked_cache_config)
+		return -1;
+
 	if (!git_config_get_maybe_bool("core.untrackedcache", &val))
 		return val;
 
diff --git a/environment.c b/environment.c
index 1cc4aab..74294ee 100644
--- a/environment.c
+++ b/environment.c
@@ -87,6 +87,12 @@ int auto_comment_line_char;
 /* Parallel index stat data preload? */
 int core_preload_index = 1;
 
+/*
+ * This is to ensure that the untracked cache is not modified, for
+ * example in test programs like test-dump-untracked-cache.
+ */
+int ignore_untracked_cache_config;
+
 /* This is set by setup_git_dir_gently() and/or git_default_config() */
 char *git_work_tree_cfg;
 static char *work_tree;
diff --git a/test-dump-untracked-cache.c b/test-dump-untracked-cache.c
index 25d855d..8d1293c 100644
--- a/test-dump-untracked-cache.c
+++ b/test-dump-untracked-cache.c
@@ -44,6 +44,8 @@ int main(int ac, char **av)
 {
 	struct untracked_cache *uc;
 	struct strbuf base = STRBUF_INIT;
+
+	ignore_untracked_cache_config = 1;
 	setup_git_directory();
 	if (read_cache() < 0)
 		die("unable to read index file");
-- 
2.7.0.36.g20612a7