certctl: Create output directories

In a pkgbase world, we cannot assume that these directories exist; we
must create them ourselves.

Fixes: c340ef28fd38 ("certctl: Reimplement in C")
Reviewed by:

certctl: Create output directories

In a pkgbase world, we cannot assume that these directories exist; we
must create them ourselves.

Fixes: c340ef28fd38 ("certctl: Reimplement in C")
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D52121

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certctl: Reimplement in C

Notable changes include:

* We no longer forget manually untrusted certificates when rehashing.

* Rehash will now scan the existing directory and progressively replace
i

certctl: Reimplement in C

Notable changes include:

* We no longer forget manually untrusted certificates when rehashing.

* Rehash will now scan the existing directory and progressively replace
its contents with those of the new trust store. The trust store as a
whole is not replaced atomically, but each file within it is.

* We no longer attempt to link to the original files, but we don't copy
them either. Instead, we write each certificate out in its minimal
form.

* We now generate a trust bundle in addition to the hashed diretory.
This also contains only the minimal DER form of each certificate.
This allows e.g. Unbound to preload the bundle before chrooting.

* The C version is approximately two orders of magnitude faster than the
sh version, with rehash taking ~100 ms vs ~5-25 s depending on whether
ca_root_nss is installed.

* We now also have tests.

Reviewed by: kevans, markj
Differential Revision: https://reviews.freebsd.org/D42320
Differential Revision: https://reviews.freebsd.org/D51896

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