guix package: -A and -s take supported systems into account.

* guix/scripts/package.scm (guix-package)[process-query]
  <list-available>: Restrict results to packages matching
  'supported-package?".
* guix/ui.scm (package->recutils): Print "systems:".
* tests/guix-package.sh: Add tests.
* doc/guix.texi (Invoking guix package): Adjust description of
  '--list-available' accordingly.

packages: Add 'supported-package?'.

* guix/packages.scm (supported-package?): New procedure.
* tests/packages.scm ("supported-package?"): New test.
* build-aux/hydra/gnu-system.scm (package->job): Use it instead of
  'package-transitive-supported-systems'.

Merge branch 'core-updates'

Merge branch 'master' into core-updates

Conflicts:
	gnu-system.am
	gnu/packages/gstreamer.scm

profiles: Generalize "hooks" for 'profile-derivation'.

* guix/profiles.scm (info-dir-file): Remove (null? (manifest-entries
  manifest)) test.
  (ca-certificate-bundle): Likewise.
  (ghc-package-cache-file): Turn 'if' into 'and', and remove second
  arm.
  (%default-profile-hooks): New variable.
  (profile-derivation): Remove #:info-dir?, #:ghc-package-cache?, and
  #:ca-certificate-bundle?.  Add #:hooks.  Iterate over HOOKS.  Adjust
  'inputs' accordingly.
* guix/scripts/package.scm (guix-package): Adjust 'profile-derivation'
  call accordingly.
* tests/packages.scm ("--search-paths with pattern"): Likewise.
* tests/profiles.scm ("profile-derivation",
  "profile-derivation, inputs"): Likewise.

lint: Add a 'derivation' checker.

* guix/scripts/lint.scm (check-derivation): New procedure.
  (%checkers): Add 'derivation' checker.
* tests/lint.scm ("derivation: invalid arguments"): New test.

packages: 'package-transitive-supported-systems' accounts for implicit inputs.

Reported by Federico Beffa.

* guix/packages.scm (package-transitive-supported-systems): Use
  bag-direct-inputs + package->bag rather than package-direct-inputs.
* tests/packages.scm ("package-transitive-supported-systems"): Add
  explicit 'build-system' field to each 'dummy-package' form.
  ("package-transitive-supported-systems, implicit inputs"): New test.

lint: Report patches that cannot be found.

* guix/scripts/lint.scm (check-patch-file-names): Wrap body in 'guard'.
* tests/lint.scm ("patches: not found"): New test.

lint: Rename 'check-patches' to 'check-patch-file-names'.

* guix/scripts/lint.scm (check-patches): Rename to...
  (check-patch-file-names): ... this.  Rename 'filename' to 'file'.
  (%checkers): Adjust accordingly.
* tests/lint.scm ("patches: file names"): Likewise.

Merge branch 'master' into core-updates

profiles: Generate GHC's package database cache.

* guix/profiles.scm (ghc-package-cache-file): New procedure.
  (profile-derivation): Add 'ghc-package-cache?' keyword argument.  If true
  (the default), add the result of 'ghc-package-cache-file' to 'inputs'.
* guix/scripts/package.scm (guix-package)[process-actions]: Pass
  #:ghc-package-cache? to 'profile-generation'.
* tests/packages.scm ("--search-paths with pattern"): Likewise.
* tests/profiles.scm ("profile-derivation"): Likewise.

import: Add hackage importer.

* guix/import/hackage.scm: New file.
* tests/hackage.scm: New file.

tests: Skip 'guix-package-net.sh' when prerequisites aren't met.

* tests/guix-package-net.sh: Reinstate networking and shebang test that
  inadvertently vanished in commit 57b8623.

Merge branch 'master' into core-updates

tests: Move 'guix package' tests that require networking to a separate file.

* tests/guix-package.sh (shebang_not_too_long): Remove.
  Move everything below "if [networking + shebang_not_too_long]" to...
* tests/guix-package-net.sh: ... here.  New file.
* Makefile.am (SH_TESTS): Add it.

guix package: Never remove the current generation and warn about it.

Fixes <http://bugs.gnu.org/19978>.
Reported by taylanbayirli@gmail.com (Taylan Ulrich Bayırlı/Kammer).

* guix/scripts/package.scm (delete-matching-generations): Warn when
  CURRENT is in NUMBERS, and always remove it before calling
  'delete-generations'.
* tests/guix-package.sh: Add --switch-generation=2 invocation before
  --delete-generations=3 invocation.
  Add --delete-generations=1.. test case.

tests: Deal with 'mount-points' not returning "/".

Fixes <http://bugs.gnu.org/20261>.
Reported by Mark H Weaver <mhw@netris.org>.

* tests/syscalls.scm ("mount-points"): Check for a few other likely
  mount points in addition to "/".

scripts: Add 'publish' command.

* guix/scripts/publish.scm: New file.
* po/guix/POTFILES.in: Add it.
* tests/publish.scm: New file.
* Makefile.am (MODULES): Add script module.
  (SCM_TESTS): Add test module.
* doc/guix.texi ("Invoking guix publish"): New node.

store: Add query-path-info operation.

* guix/store.scm (<path-info>): New record type.
  (read-path-info): New procedure.
  (read-arg): Add 'path-info' syntax.
  (query-path-info): New variable.
* tests/store.scm ("query-path-info"): New test.

Merge branch 'master' into core-updates