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libgit2 has two distinct requirements that were previously solved by
`git_buf`. We require:
1. A general purpose string class that provides a number of utility APIs
for manipulating data (eg, concatenating, truncating, etc).
2. A structure that we can use to return strings to callers that they
can take ownership of.
By using a single class (`git_buf`) for both of these purposes, we have
confused the API to the point that refactorings are difficult and
reasoning about correctness is also difficult.
Move the utility class `git_buf` to be called `git_str`: this represents
its general purpose, as an internal string buffer class. The name also
is an homage to Junio Hamano ("gitstr").
The public API remains `git_buf`, and has a much smaller footprint. It
is generally only used as an "out" param with strict requirements that
follow the documentation. (Exceptions exist for some legacy APIs to
avoid breaking callers unnecessarily.)
Utility functions exist to convert a user-specified `git_buf` to a
`git_str` so that we can call internal functions, then converting it
back again.
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Allow users to specify additional repository extensions that they want
to support. For example, callers can specify that they support
`preciousObjects` and then may open repositories that support
`extensions.preciousObjects`.
Similarly, callers may opt out of supporting extensions that the library
itself supports.
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fixes #6003
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Provide an interface around OpenSSL to dynamically load the libraries
and symbols, so that users can distribute a libgit2 library that is not
linked directly against OpenSSL. This enables users to target multiple
distributions with a single binary.
This mechanism is optional and disabled by default. Configure cmake
with -DUSE_HTTPS=OpenSSL-Dynamic to use it.
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Introduce GIT_OPT_SET_ODB_LOOSE_PRIORITY and GIT_OPT_SET_ODB_PACKED_PRIORITY
to allow overriding the default priority values for the default ODB
backends. Libgit2 has historically assumed that most objects for long-
running operations will be packed, therefore GIT_LOOSE_PRIORITY is
set to 1 by default, and GIT_PACKED_PRIORITY to 2.
When a client allows libgit2 to set the default backends, they can
specify an override for the two priority values in order to change
the order in which each ODB backend is accessed.
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A function to provide the initialization count of the library; this is
subject to race conditions but is useful for a naive determination as to
whether the library has been initialized or not.
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`git_buf_sanitize` is called with user-input, and wants to sanity-check
that input. Allow it to return a value if the input was malformed in a
way that we cannot cope.
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Move leak check initialization into git_win32_leakcheck_global_init, and
call it on library initialization.
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msvc crtdbg is a mouthfull that is not particularly indicative of what
it does. Let's rename it to "win32 leakcheck".
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Now that we've identified that our global settings really aren't global
at all, and refactored the library to match that, change global.c to
libgit2.c, which is especially nice since the prefix of the functions
matches the filename.
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