The clone options contain fields for ae remote create callback
and its payload, which can be used to override the behavior when
the default remote is being created for newly cloned
repositories.
Currently we only accept a C function as callback, though, making
it overly complicated to use it. We also unconditionally `free`
the payload if its address is non-`nil`, which may cause the
program to segfault when the memory is not dynamically allocated.
Instead, we want callers to provide a Go function that is
subsequently being called by us. To do this, we introduce an
indirection such that we are able to extract the provided
function and payload when being called by `git_clone` and handle
the return values of the user-provided function.
The option to ignore the server's certificate has been removed, replaced
witha callback for the user to perform their own checking.
Remote.Fetch() now performs opportunistic updates and takes a list of
refspecs to use as the active set for a particular fetch.
This commit adds barebones capacity to generate diffs from two trees and
to emit those as git-style diffs (via `Patch.String`), or to enumerate
the files/hunks/lines in the diff to emit the data yourself.
The walk functions have been implemented in the same manner as the Odb
walking methods.
Note that not all of the functionality is implemented for either the
`git_diff_*` nor the `git_patch_*` functions, and there are unexposed
constants which would likely be useful to add.