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v0.8.1
https://github.com/git/git
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Tip revision: 9a8c2b67cd5a51666f2c0ce3fbbdb08b97b79b3d authored by Junio C Hamano on 17 December 2014, 19:30:46 UTC
Git 2.0.5
Tip revision: 9a8c2b6
test-index-version.c
#include "cache.h"

int main(int argc, 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;
}
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