1 files changed, 81 insertions, 0 deletions
diff --git a/show-diff.c b/show-diff.c
new file mode 100644
index 000000000..b8522886a
--- /dev/null
+++ b/show-diff.c
@@ -0,0 +1,81 @@
+#include "cache.h"
+
+#define MTIME_CHANGED	0x0001
+#define CTIME_CHANGED	0x0002
+#define OWNER_CHANGED	0x0004
+#define MODE_CHANGED    0x0008
+#define INODE_CHANGED   0x0010
+#define DATA_CHANGED    0x0020
+
+static int match_stat(struct cache_entry *ce, struct stat *st)
+{
+	unsigned int changed = 0;
+
+	if (ce->mtime.sec  != (unsigned int)st->st_mtim.tv_sec ||
+	    ce->mtime.nsec != (unsigned int)st->st_mtim.tv_nsec)
+		changed |= MTIME_CHANGED;
+	if (ce->ctime.sec  != (unsigned int)st->st_ctim.tv_sec ||
+	    ce->ctime.nsec != (unsigned int)st->st_ctim.tv_nsec)
+		changed |= CTIME_CHANGED;
+	if (ce->st_uid != (unsigned int)st->st_uid ||
+	    ce->st_gid != (unsigned int)st->st_gid)
+		changed |= OWNER_CHANGED;
+	if (ce->st_mode != (unsigned int)st->st_mode)
+		changed |= MODE_CHANGED;
+	if (ce->st_dev != (unsigned int)st->st_dev ||
+	    ce->st_ino != (unsigned int)st->st_ino)
+		changed |= INODE_CHANGED;
+	if (ce->st_size != (unsigned int)st->st_size)
+		changed |= DATA_CHANGED;
+	return changed;
+}
+
+static void show_differences(struct cache_entry *ce, struct stat *cur,
+	void *old_contents, unsigned long long old_size)
+{
+	static char cmd[1000];
+	FILE *f;
+
+	snprintf(cmd, sizeof(cmd), "diff -u - %s", ce->name);
+	f = popen(cmd, "w");
+	fwrite(old_contents, old_size, 1, f);
+	pclose(f);
+}
+
+int main(int argc, char **argv)
+{
+	int entries = read_cache();
+	int i;
+
+	if (entries < 0) {
+		perror("read_cache");
+		exit(1);
+	}
+	for (i = 0; i < entries; i++) {
+		struct stat st;
+		struct cache_entry *ce = active_cache[i];
+		int n, changed;
+		unsigned int mode;
+		unsigned long size;
+		char type[20];
+		void *new;
+
+		if (stat(ce->name, &st) < 0) {
+			printf("%s: %s\n", ce->name, strerror(errno));
+			continue;
+		}
+		changed = match_stat(ce, &st);
+		if (!changed) {
+			printf("%s: ok\n", ce->name);
+			continue;
+		}
+		printf("%.*s:  ", ce->namelen, ce->name);
+		for (n = 0; n < 20; n++)
+			printf("%02x", ce->sha1[n]);
+		printf("\n");
+		new = read_sha1_file(ce->sha1, type, &size);
+		show_differences(ce, &st, new, size);
+		free(new);
+	}
+	return 0;
+}