branch master updated (f6f6e1e -> 4f621a2)

[guix-commits]

civodul pushed a change to branch master
in repository guix.

    from f6f6e1e  gnu: serf: Build with Python 3.
     new 6d955f1  tests: Check the build trace for hash mismatches on 
substitutes.
     new 9dfa20a  daemon: Let 'guix substitute' perform hash checks.
     new 77a1efe  tests: Check the mtime and permissions of substituted items.
     new 15cf28f  daemon: Do not reset timestamps and permissions on 
substituted items.
     new 3c799cc  tests: Make sure substituted items are deduplicated.
     new c7c7f06  daemon: Delegate deduplication to 'guix substitute'.
     new 4f621a2  maint: Require Guile >= 2.2.6.

The 7 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:
 configure.ac                 |  2 +-
 guix/gexp.scm                | 15 ++------
 guix/inferior.scm            | 11 +-----
 guix/monads.scm              | 15 ++------
 guix/scripts/publish.scm     | 26 --------------
 guix/scripts/substitute.scm  | 70 ++++++++++++++++++++++++++++++------
 guix/serialization.scm       |  8 +++--
 guix/store/deduplication.scm | 32 +++--------------
 nix/libstore/build.cc        | 85 ++++++++++++++++++++++++--------------------
 tests/store.scm              | 82 ++++++++++++++++++++++++++++++++++++++++++
 tests/substitute.scm         | 56 ++++++++++++++++++++++++++---
 11 files changed, 257 insertions(+), 145 deletions(-)