[RFC PATCH v4 02/19] Add test-index-version

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

Commit 06aaaa0bf70fe37d198893f4e25fa73b6516f8a9 may step index format
version up and down, depends on whether extended flags present in the
index. This adds a test to check for index format version.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 .gitignore           |    1 +
 Makefile             |    1 +
 test-index-version.c |   14 ++++++++++++++
 3 files changed, 16 insertions(+), 0 deletions(-)
 create mode 100644 test-index-version.c

diff --git a/.gitignore b/.gitignore
index c446290..01753f8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -157,6 +157,7 @@ test-date
 test-delta
 test-dump-cache-tree
 test-genrandom
+test-index-version
 test-match-trees
 test-parse-options
 test-path-utils
diff --git a/Makefile b/Makefile
index 4190a5d..f49435a 100644
--- a/Makefile
+++ b/Makefile
@@ -1586,6 +1586,7 @@ TEST_PROGRAMS += test-parse-options$X
 TEST_PROGRAMS += test-path-utils$X
 TEST_PROGRAMS += test-sha1$X
 TEST_PROGRAMS += test-sigchain$X
+TEST_PROGRAMS += test-index-version$X
 
 all:: $(TEST_PROGRAMS)
 
diff --git a/test-index-version.c b/test-index-version.c
new file mode 100644
index 0000000..bfaad9e
--- /dev/null
+++ b/test-index-version.c
@@ -0,0 +1,14 @@
+#include "cache.h"
+
+int main(int argc, const char **argv)
+{
+	struct cache_header hdr;
+	int version;
+
+	memset(&hdr,0,sizeof(hdr));
+	if (read(0, &hdr, sizeof(hdr)) != sizeof(hdr))
+		return 0;
+	version = ntohl(hdr.hdr_version);
+	printf("%d\n", version);
+	return 0;
+}
-- 
1.6.3.GIT