branch master updated (20e5658 -> 799f066)

[guix-commits]

civodul pushed a change to branch master
in repository guix.

    from 20e5658  gnu: ocaml-menhir: Update to 20200211.
     new e9edaf3  database: Remove unnecessary module imports.
     new 4a98735  gnu: autotools: Add version 2.70.
     new 2e30823  daemon: 'Agent' constructor takes a list of environment 
variables.
     new 79c6614  daemon: Use 'Agent' to spawn 'guix substitute --query'.
     new a618a8c  daemon: Factorize substituter agent spawning.
     new 711df9e  daemon: Run 'guix substitute --substitute' as an agent.
     new 5ff5214  substitute: Cache and reuse connections while substituting.
     new bfe4cdf  daemon: Raise an error if substituter doesn't send the 
expected hash.
     new 799f066  import: opam: Adjust test to latest 'opam->guix-package' 
changes.

The 9 revisions listed above as "new" are entirely new to this
repository and will be described in separate emails.  The revisions
listed as "add" were already present in the repository and have only
been added to this reference.


Summary of changes:
 gnu/packages/autotools.scm  |  35 +++++-
 guix/http-client.scm        |  12 +--
 guix/import/opam.scm        |   3 +
 guix/progress.scm           |   8 +-
 guix/scripts/substitute.scm | 253 +++++++++++++++++++++++++++++---------------
 guix/store/database.scm     |   2 -
 nix/libstore/build.cc       | 173 ++++++++++++++++--------------
 nix/libstore/local-store.cc | 170 +++++++----------------------
 nix/libstore/local-store.hh |  25 ++---
 nix/libutil/util.cc         |   6 +-
 nix/libutil/util.hh         |   7 +-
 tests/opam.scm              |  67 ++++++------
 tests/substitute.scm        |  98 ++++++++++-------
 13 files changed, 458 insertions(+), 401 deletions(-)