Merge branch 'master' into core-updates

daemon: Really enable automatic deduplication by default.

* nix/nix-daemon/guix-daemon.cc (main): Set 'autoStoreOptimise' to
  true.  Add 'printMsg' call.
* tests/derivations.scm ("identical files are deduplicated"): New test.

Merge branch 'master' into core-updates

Factorize test suite support in (guix tests).

* guix/tests.scm: New file.
* Makefile.am (noinst_DATA): New variable.
  (GOBJECTS): Add guix/tests.go.
* tests/builders.scm (%store): Use 'open-connection-for-tests'
  from (guix tests).
* tests/derivations.scm: Likewise.
* tests/monads.scm: Likewise.
* tests/packages.scm: Likewise.
* tests/profiles.scm: Likewise.
* tests/union.scm: Likewise.
* tests/gexp.scm: Likewise.
  (guile-for-build): Remove.  Use (%guile-for-build) instead.
* tests/nar.scm (make-random-bytevector, %seed, random-text): Remove.
  (populate-file): Change 'make-random-bytevector' to 'random-bytevector'.
  Use (guix tests).
* tests/store.scm (%seed, random-text): Remove.
  Use (guix tests).

Merge branch 'master' into core-updates

derivations: Add #:allowed-references 'derivation' parameter.

* guix/derivations.scm (derivation): Add #:allowed-references
  parameter.
  [user+system-env-vars]: Honor it.
* tests/derivations.scm ("derivation #:allowed-references, ok",
  "derivation #:allowed-references, not allowed",
  "derivation #:allowed-references, self allowed",
  "derivation #:allowed-references, self not allowed"): New tests.
* doc/guix.texi (Derivations): Document #:allowed-references.

derivations: Fix 'fixed-output-derivation?'.

Reported by Nikita Karetnikov <nikita@karetnikov.org>.

* guix/derivations.scm (fixed-output-derivation?): Fix pattern.
* tests/derivations.scm ("fixed-output-derivation?"): Add test.

tests: Make sure substitutes are usable when we need them.

* tests/derivations.scm ("derivation-prerequisites-to-build and
  substitutes"): Add call to 'set-build-options'.

Merge branch 'master' into core-updates

store: Add #:timeout build option.

* guix/serialization.scm (write-string-pairs): New procedure.
* guix/store.scm (write-arg): Add 'string-pairs' case.
  (set-build-options): Add 'timeout' keyword parameter.  Honor it.
* tests/derivations.scm ("build-expression->derivation and timeout"):
  New test.

Merge branch 'master' into core-updates

Conflicts:
	gnu-system.am

derivations: Add support for recursive fixed-output derivations.

* guix/derivations.scm (<derivation-output>): Add 'recursive?' field.
  Adjust 'make-derivation-output' callers.
  (%read-derivation) <fixed-output>: When HASH-ALGO starts with 'r:',
  set the 'recursive?' field and drop 'r:' from the hash algo name.
  (write-derivation)[write-output]: Write the algo as 'r:HASH-ALGO' when
  the RECURSIVE? field is set.
  (derivation-hash) <fixed-output>: Prepend "r:" when RECURSIVE? is set.
  (fixed-output-path): New procedure.
  (derivation): Add #:recursive? parameter.  Use 'fixed-output-path' to
  compute the output file name of a fixed output derivation.
  (build-expression->derivation): Add #:recursive? parameter.  Pass it
  to 'derivation'.
* tests/derivations.scm ("fixed-output derivation, recursive",
  "build-expression->derivation produces recursive fixed-output",
  "build-expression->derivation uses recursive fixed-output"): New
  tests.
* doc/guix.texi (Derivations): Document #:recursive? for 'derivation'.
  Add #:recursive? for 'build-expression->derivation'.

derivations: Use more keyword parameters for 'build-expression->derivation'.

* guix/derivations.scm (build-expression->derivation): Turn 'system' and
  'inputs' into keyword parameters.
  Adjust callers accordingly.
* gnu/system/linux.scm, gnu/system/vm.scm, guix/build-system/cmake.scm,
  guix/build-system/gnu.scm, guix/build-system/perl.scm,
  guix/build-system/python.scm, guix/build-system/trivial.scm,
  guix/download.scm, guix/packages.scm, guix/profiles.scm,
  guix/scripts/pull.scm, tests/derivations.scm, tests/guix-build.sh,
  tests/monads.scm, tests/store.scm, tests/union.scm: Adjust users of
  'build-expression->derivation' and 'derivation-expression'
  accordingly.
* doc/guix.texi (Derivations): Adjust 'build-expression->derivation'
  documentation accordingly.
  (The Store Monad): Likewise for 'derivation-expression'.

Merge branch 'master' into core-updates

Conflicts:
	guix/packages.scm

derivations: Allow 'map-derivations' to replace sources.

* guix/derivations.scm (map-derivation)[input->output-paths]: Allow
  non-derivation inputs.
  Allow replacements to be store files.  Replace in SOURCES too.
* tests/derivations.scm ("map-derivation, sources"): New test.

derivations: Add 'map-derivation'.

* guix/derivations.scm (map-derivation): New procedure.
* tests/derivations.scm ("map-derivation"): New test.

Merge branch 'master' into core-updates

Conflicts:
	guix/packages.scm

tests: Fix max-silent-time test.

* tests/derivations.scm ("build-expression->derivation and
  max-silent-time"): Use STORE instead of %STORE.  Change BUILDER to
  succeed by default.  Return #f when no exception is raised.

tests: Add the builder as an input to raw derivations.

* tests/derivations.scm ("build derivation with 1 source",
  "derivation with local file as input",
  "derivation with a fixed-output input",
  "multiple-output derivation",
  "multiple-output derivation, non-alphabetic order",
  "user of multiple-output derivation"): Add %BASH as an input, needed
  in chroot builds.

Merge branch 'master' into core-updates