Add a "git-show-index" helper that shows the contents of a pack index

This was invaluable for debugging the zero-sized compression issue, and
might be useful for scripting too, if people want to see the contents of
a pack.

diff --git a/Makefile b/Makefile
index 877d10b18d394f366c033295bab203df7c3f1068..5dcfc24f892b92f5adcbbc8396d48de565309538 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -43,7 +43,8 @@ PROG=   git-update-cache git-diff-files git-init-db git-write-tree \
        git-get-tar-commit-id git-apply git-stripspace \
        git-diff-stages git-rev-parse git-patch-id git-pack-objects \
        git-unpack-objects git-verify-pack git-receive-pack git-send-pack \
-       git-prune-packed git-fetch-pack git-upload-pack git-clone-pack
+       git-prune-packed git-fetch-pack git-upload-pack git-clone-pack \
+       git-show-index
 
 all: $(PROG)
 

diff --git a/show-index.c b/show-index.c
new file mode 100644 (file)
index 0000000..c21d660
--- /dev/null
+++ b/show-index.c
@@ -0,0 +1,28 @@
+#include "cache.h"
+
+int main(int argc, char **argv)
+{
+       int i;
+       unsigned nr;
+       unsigned int entry[6];
+       static unsigned int top_index[256];
+
+       if (fread(top_index, sizeof(top_index), 1, stdin) != 1)
+               die("unable to read idex");
+       nr = 0;
+       for (i = 0; i < 256; i++) {
+               unsigned n = ntohl(top_index[i]);
+               if (n < nr)
+                       die("corrupt index file");
+               nr = n;
+       }
+       for (i = 0; i < nr; i++) {
+               unsigned offset;
+
+               if (fread(entry, 24, 1, stdin) != 1)
+                       die("unable to read entry %u/%u", i, nr);
+               offset = ntohl(entry[0]);
+               printf("%u %s\n", offset, sha1_to_hex((void *)(entry+1)));
+       }
+       return 0;
+}