Re: [PATCH 0/2] recover from "failed to apply delta"

Jeff King [off-list ref] writes:

quoted

+     # At the beginning of the REF_DELTA representation of $blob_3,
+     # write 20-byte base object name for $blob_1, instead of $blob_2.
+     # The binary representation of object name for $blob_1 is found
+     # at offset 4 + 4 + 256*4 = 1032 for 20 bytes.
+     dd if=${pack}.idx bs=1 count=20 skip=1032 | do_corrupt_object $blob_3 2 20 &&
+     test_must_fail git cat-file blob $blob_3 >/dev/null &&

I didn't want to bother coming up with the binary version of the
REF_DELTA sha1, so I used OFS_DELTA. :)

Yeah, I contemplated on doing something like this

	printf "$(echo $blob_3 | sed -e 's/\(..\)/\\x\1/g')"

but of course printf "\xAA" is not in POSIX and at that point I
punted and instead read from .idx at the known offset ;-)