errors: refactoring - never return NULL in git_error_last()#6625
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errors: refactoring - never return NULL in git_error_last()#6625
NULL in git_error_last()#6625Conversation
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The error handling in the ssh certificate callback is straightforward. There's no error messages from an external library that need to be saved, we populate the error message ourselves. Since there's nothing custom here, it does not need to use the error saving mechanism.
Callers want to be able to simply call `git_error_last()->message`, not have to worry about whether `git_error_last()` returns NULL or not.
Most callers only need to _get_ error messages. Only callers implemented more complicated functions (like a custom ODB for example) need to set them. (Callback users should likely ferry their own error information in their callback payload.)
Instead of having a separate type for saving state, we can re-use the `git_error` structure. In practice, saving the error code along with the `git_error` information has not proven necessary or useful, so it can be removed to simplify down to re-using a single structure.
Now that thread-local error data is handled in error, move the thread local data out of the `threadstate` object, since it has now become useless indirection.
We now have no "big single object" that contains thread state.
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This was referenced Mar 21, 2024
klayoutmatthias
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Mar 23, 2024
`git_error_set_str` was moved into the `sys` subdirectory in libgit2 1.8.0. See [this pull request](libgit2/libgit2#6625) for details and [this issue](libgit2/libgit2#6776) for more context.
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As a consumer, you often just want to print
git_error_last()->messageon an error. This would be irresponsible sincegit_error_last()can returnNULL. Instead, always returnno errorwhen there's no error. Fixes #6618