[bug#43340] [PATCH 0/5] Speed up archive export/import

[Ludovic Courtès]

Hi!

This patch series goes on top of <https://issues.guix.gnu.org/43285>.
It addresses the performance issue described at:

  https://lists.gnu.org/archive/html/guix-devel/2020-09/msg00073.html

Specifically, it implements option #4 (spawning ‘guix authenticate’
once for the whole session, instead of spawning it every time a
store item needs to be signed or authenticated), achieving a ~15x
speedup, which is not bad.  :-)

There’s way more C++ code than I would like, and it’s probably not
pretty code (I always end up typing things like “C++ list append”
in a search engine to find the obscure incantation that does that).
There’s now a query/reply protocol between the daemon and ‘guix
authenticate’.  Nothing fancy, but it allows for strings that contain
whitespace or newlines, which is necessary here.

That’s it!

Ludo’.

Ludovic Courtès (5):
  daemon: Generalize 'HookInstance' to 'Agent'.
  daemon: Isolate signing and signature verification functions.
  daemon: Move 'Agent' to libutil.
  daemon: Spawn 'guix authenticate' once for all.
  authenticate: Cache the ACL and key pairs.

 guix/scripts/authenticate.scm | 163 ++++++++++++++++++++++++++--------
 nix/libstore/build.cc         | 146 +++++-------------------------
 nix/libstore/local-store.cc   | 103 +++++++++++++++++----
 nix/libutil/util.cc           |  84 ++++++++++++++++++
 nix/libutil/util.hh           |  25 ++++++
 tests/guix-authenticate.sh    |  45 ++++++----
 tests/store.scm               |   8 +-
 7 files changed, 372 insertions(+), 202 deletions(-)

-- 
2.28.0