Lookup a blob object from a repository.
@param blob pointer to the looked up blob @param repo the repo to use when locating the blob. @param id identity of the blob to locate. @return 0 or an error code
See Implementation
Lookup a blob object from a repository.
@param blob pointer to the looked up blob @param repo the repo to use when locating the blob. @param id identity of the blob to locate. @return 0 or an error code