guix lint: Make the 'source' checker happy if at least one URI is valid.

Before that it would check all the URIs of each package.

* guix/scripts/lint.scm (validate-uri): Really return #f on failure and
  #t otherwise.
  (check-source): Replace 'for-each' with 'any'.

lint: add 'source' checker.

* guix/scripts/lint.scm (validate-uri?): New procedure.
  (%checkers): Add 'source' checker

guix system: Improve error messages.

* guix/ui.scm (report-error): Export.
* guix/scripts/system.scm (read-operating-system): Report syntax errors
  using standard GNU format.  Report other errors using 'display-error'.

guix package: Avoid spurious warnings from 'find-files'.

Reported by Andreas Enge <andreas@enge.fr>.

* guix/scripts/package.scm (with-null-error-port): New macro.
  (search-path-environment-variables): Wrap 'search-path-as-list' call
  in 'with-null-error-port'.

guix archive: Add -r/--recursive.

* guix/scripts/archive.scm (show-help, %options): Add -r/--recursive.
  (export-from-store): Pass #:recursive? to 'export-paths'.
* doc/guix.texi (Invoking guix archive): Add -r in Emacs example.  Add
  example with ~/.guix-profile.  Document -r/--recursive.

guix archive: Remove unused -r/--root option.

* guix/scripts/archive.scm (%options): Remove -r/--root.

Merge branch 'core-updates'

Conflicts:
	gnu/packages/bootstrap.scm

monads: Move '%store-monad' and related procedures where they belong.

This turns (guix monads) into a generic module for monads, and moves the
store monad and related monadic procedures in their corresponding
module.

* guix/monads.scm (store-return, store-bind, %store-monad, store-lift,
  text-file, interned-file, package-file, package->derivation,
  package->cross-derivation, origin->derivation, imported-modules,
  compiled, modules, built-derivations, run-with-store): Move to...
* guix/store.scm (store-return, store-bind, %store-monad, store-lift,
  text-file, interned-file): ... here.
  (%guile-for-build): New variable.
  (run-with-store): Moved from monads.scm.  Remove default value for
  #:guile-for-build.
* guix/packages.scm (default-guile): Export.
  (set-guile-for-build): New procedure.
  (package-file, package->derivation, package->cross-derivation,
  origin->derivation): Moved from monads.scm.
* guix/derivations.scm (%guile-for-build): Remove.
  (imported-modules): Rename to...
  (%imported-modules): ... this.
  (compiled-modules): Rename to...
  (%compiled-modules): ... this.
  (built-derivations, imported-modules, compiled-modules): New
  procedures.
* gnu/services/avahi.scm, gnu/services/base.scm, gnu/services/dbus.scm,
  gnu/services/dmd.scm, gnu/services/networking.scm,
  gnu/services/ssh.scm, gnu/services/xorg.scm, gnu/system/install.scm,
  gnu/system/linux-initrd.scm, gnu/system/shadow.scm, guix/download.scm,
  guix/gexp.scm, guix/git-download.scm, guix/profiles.scm,
  guix/svn-download.scm, tests/monads.scm: Adjust imports accordingly.
* guix/monad-repl.scm (default-guile-derivation): New procedure.
  (store-monad-language, run-in-store): Use it.
* build-aux/hydra/gnu-system.scm (qemu-jobs): Add explicit
  'set-guile-for-build' call.
* guix/scripts/archive.scm (derivation-from-expression): Likewise.
* guix/scripts/build.scm (options/resolve-packages): Likewise.
* guix/scripts/environment.scm (guix-environment): Likewise.
* guix/scripts/system.scm (guix-system): Likewise.
* doc/guix.texi (The Store Monad): Adjust module names accordingly.

Merge branch 'master' into core-updates

import: Add CPAN importer.

* guix/import/cpan.scm, guix/scripts/import/cpan.scm, tests/cpan.scm:
  New files.
* Makefile.am (MODULE)[HAVE_GUILE_JSON]: Add them.
* guix/scripts/import.scm (importers): Add cpan.
* doc/guix.texi (Requirements): Mention `guix import cpan` as a user
  of guile-json.
  (Invoking guix import): Document new `guix import cpan` command.

substitute-binary: Micro-optimize 'narinfo-sha256'.

* guix/scripts/substitute-binary.scm (narinfo-signature->canonical-sexp):
  Change "~a" to "~s" in error message.
  (%signature-line-rx): Remove.
  (narinfo-sha256): Use 'string-contains' instead of 'regexp-exec', and
  'string-take' instead of 'match:substring'.

guix package: Follow symlinks for pattern search paths.

* guix/scripts/package.scm (search-path-environment-variables): Add
  local 'files' variable.
* tests/packages.scm ("--search-paths with pattern"): New test.

Merge branch 'master' into core-updates

lint: Add tests for the 'home-page' checker.

Suggested by Cyril Roelandt <tipecaml@gmail.com>.

* tests/lint.scm (%http-server-port, %http-server-socket, %local-url,
  stub-http-server): New variables.
  (http-write, call-with-http-server): New procedures.
  (with-http-server): New macro.
  ("home-page: wrong home-page", "home-page: invalid URI", "home-page:
  host not found", "home-page: Connection refused", "home-page: 200",
  "home-page: 404"): New tests.
* guix/scripts/lint.scm (check-home-page): Export.

lint: Report on the package being checked.

* guix/scripts/lint.scm (run-checkers): Check
  whether (current-error-port) is a tty, and print the package being
  checked and the checker currently running when it is.

lint: Add 'home-page' checker.

* guix/build/download.scm (open-connection-for-uri): Export.
* guix/scripts/lint.scm (probe-uri, check-home-page): New procedures.
  (%checkers): Add 'home-page' checker.

guix package: Use 'search-path-as-list' instead of custom code.

This will handle the new 'file-type' and 'file-pattern' fields correctly.

* guix/scripts/package.scm (search-path-environment-variables)[search-path-definition]:
  Rewrite in terms of 'search-path-as-list'.

utils: Export 'search-path-as-list'.

* guix/build/utils.scm (search-path-as-list): Make public.
* guix/scripts/environment.scm (for-each-search-path): Use it.

packages: Add 'file-type' field to 'search-path-specification'.

Fixes <http://bugs.gnu.org/18033>.

* guix/packages.scm (<search-path-specification>): Rename 'directories'
  field to 'files'.  Add 'file-type'.
  (search-path-specification->sexp): Honor 'file-type'.
* gnu/packages/autotools.scm, gnu/packages/bootstrap.scm,
  gnu/packages/cross-base.scm, gnu/packages/games.scm,
  gnu/packages/gcc.scm, gnu/packages/glib.scm,
  gnu/packages/guile.scm, gnu/packages/man.scm,
  gnu/packages/perl.scm, gnu/packages/pkg-config.scm,
  gnu/packages/python.scm, gnu/packages/ruby.scm,
  gnu/packages/xfce.scm: Change 'directories' to 'files'.
* tests/packages.scm ("search paths"): Change 'directories' field to
  'files'.
* guix/scripts/environment.scm (for-each-search-path): Likewise.

Merge branch 'master' into 'core-updates'.