Submodule update values

These values represent settings for the submodule.$name.update configuration value which says how to handle git submodule update for this submodule. The value is usually set in the ".gitmodules" file and copied to ".git/config" when the submodule is initialized.

You can override this setting on a per-submodule basis with git_submodule_set_update() and write the changed value to disk using git_submodule_save(). If you have overwritten the value, you can revert it by passing GIT_SUBMODULE_UPDATE_RESET to the set function.

The values are:

• GIT_SUBMODULE_UPDATE_CHECKOUT: the default; when a submodule is updated, checkout the new detached HEAD to the submodule directory.
• GIT_SUBMODULE_UPDATE_REBASE: update by rebasing the current checked out branch onto the commit from the superproject.
• GIT_SUBMODULE_UPDATE_MERGE: update by merging the commit in the superproject into the current checkout out branch of the submodule.
• GIT_SUBMODULE_UPDATE_NONE: do not update this submodule even when the commit in the superproject is updated.
• GIT_SUBMODULE_UPDATE_DEFAULT: not used except as static initializer when we don't want any particular update rule to be specified.