Fixes <http://bugs.gnu.org/26201>.
Reported by <dian_cecht@zoho.com>.
These options allow nars to be "baked" off-line and cached instead of
being compressed on the fly. As a side-effect, this allows us to
provide a 'Content-Length' header for nars.
* guix/scripts/publish.scm (show-help, %options): Add '--cache' and
'--workers'.
(%default-options): Add 'workers'.
(nar-cache-file, narinfo-cache-file, run-single-baker): New procedures.
(single-baker): New macro.
(render-narinfo/cached, bake-narinfo+nar)
(render-nar/cached): New procedures.
(make-request-handler): Add #:cache and #:pool parameters and honor
them.
(run-publish-server): Likewise.
(guix-publish): Honor '--cache' and '--workers'.
* tests/publish.scm ("with cache"): New test.
* doc/guix.texi (Invoking guix publish): Document it.
00753f7038