Add a setting to require a filter to be successful
By default, a missing filter driver or a failure from the filter driver is not an error, but merely makes the filter operation a no-op pass through. This is useful to massage the content into a shape that is more convenient for the platform, filesystem, and the user to use, and the content filter mechanism is not used to turn something unusable into usable. However, we could also use of the content filtering mechanism and store the content that cannot be directly used in the repository (e.g. a UUID that refers to the true content stored outside git, or an encrypted content) and turn it into a usable form upon checkout (e.g. download the external content, or decrypt the encrypted content). For such a use case, the content cannot be used when filter driver fails, and we need a way to tell Git to abort the whole operation for such a failing or missing filter driver. Add a new "filter.<driver>.required" configuration variable to mark the second use case. When it is set, git will abort the operation when the filter driver does not exist or exits with a non-zero status code. Signed-off-by: NJehan Bing <jehan@orb.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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