gnu-maintenance: Optimize `release-file'.

* guix/gnu-maintenance.scm (tarball-regexp): Remove.
  (%tarball-rx): New variable.
  (release-file): Adjust to use %TARBALL-RX.

gnu-maintenance: Optimize `latest-release'.

* guix/gnu-maintenance.scm (tarball-regexp, sans-extension,
  release-file): New procedures.
  (%alpha-tarball-rx): New variable.
  (releases): Use them instead of local copies.
  (latest-release): Rewrite to not do a recursive search of all
  versions and instead jump directly to the latest.

Add `guix refresh' and related auto-update tools.

* guix/gnu-maintenance.scm (ftp-server/directory)[quirks]: Add glib.
  (package-update-path, download-tarball, package-update,
  update-package-source): New procedures.
* guix/gnupg.scm, guix/scripts/refresh.scm: New files.
* Makefile.am (MODULES): Add them.
* guix/utils.scm (file-extension): New procedure.

ui: Add a 'define-diagnostic' macro.

* guix/ui.scm (define-diagnostic): New macro, which is based on the
  previous version of 'warning'.
  (warning, leave): Redefine using 'define-diagnostic'.
  (report-error): New macro.
  (install-locale): Use 'warning' instead of 'format'.
  (call-with-error-handling): Adjust 'leave'.
* gnu/packages.scm (package-files): Use 'warning' instead of 'format'.
* guix/gnu-maintenance.scm (http-fetch): Use 'warning' and 'leave'.
* guix/scripts/build.scm (derivations-from-package-expressions, guix-build):
  Adjust 'leave'.
* guix/scripts/download.scm (guix-download): Adjust 'leave'.
* guix/scripts/gc.scm (size->number, %options): Adjust 'leave'.
* guix/scripts/package.scm (roll-back, guix-package): Adjust 'leave'.
* po/POTFILES.in: Add 'guix/gnu-maintenance.scm'.

gnu-maintenance: Adjust `http-fetch' to the various Guile versions.

* guix/gnu-maintenance.scm (http-fetch): Try #:streaming? #t, or
  'http-get*', or 'http-get' as a last resort.  Check whether DATA is
  #f, a string, or an input port.

gnu-maintenance: Improve 'official-gnu-packages'; add related procedures.

* guix/gnu-maintenance.scm (http-fetch): Return an input port.
  (<gnu-package-descriptor>): Add it.
  (official-gnu-packages): Use <gnu-package-descriptor>.
  (find-packages): Add it.
  (gnu-package?): Adjust accordingly.

guix package: Gracefully handle `official-gnu-packages' failure.

* guix/gnu-maintenance.scm (http-fetch): Error out when DATA is #f.
* guix/scripts/package.scm (check-package-freshness): Wrap
  `gnu-package?' call in `false-if-exception'.
  Reported by Cyril Roelandt <tipecaml@gmail.com>.

gnu-maintenance: Clarify `releases'.

* guix/gnu-maintenance.scm (releases): Change to use `match' and
  `match-lambda'.  Add `release-file' auxiliary function.

gnu-maintenance: Fix `gnu-package?' for packages lacking a `source'.

* guix/gnu-maintenance.scm (gnu-package?): Support PACKAGE when its
  source is #f.

guix package: Inform about new upstream versions of GNU packages.

* guix/gnu-maintenance.scm (gnu-package?): New procedure.
* guix/scripts/package.scm (waiting): New macro.
  (check-package-freshness): New procedure.
  (guix-package)[process-actions]: Use it.
* doc/guix.texi (Invoking guix package): Mention the feature.

Add version-compare and version>? to utils.scm.

* guix/utils.scm (version-compare, version>?): New exported procedures,
  based on version-string>?, which was formerly in gnu-maintenance.scm.

* guix/gnu-maintenance.scm (version-string>?): Removed procedure.
  (latest-release): Use 'version>?' instead of 'version-string>?'.

gnu-maintenance: Add `latest-release' and related tools.

* guix/gnu-maintenance.scm (ftp-server/directory, releases,
  version-string>?, latest-release, gnu-package-name->name+version): New
  procedures.
  (%package-name-rx): New variable.

Merge branch 'master' into core-updates

Conflicts:
	build-aux/download.scm
	distro/packages/autotools.scm
	distro/packages/base.scm
	distro/packages/bootstrap.scm
	distro/packages/lsh.scm
	distro/packages/make-bootstrap.scm
	distro/packages/ncurses.scm
	distro/packages/perl.scm
	tests/derivations.scm
	tests/union.scm

Update license headers.

Change all license headers, except guix/build/* and ld-wrapper.scm, with
this code:

  (use-modules (guix build utils)
	       (srfi srfi-1))

  (fluid-set! %default-port-encoding "UTF-8")

  (substitute* (remove (lambda (f)
			 (or (string-contains f ".tar.")
			     (string-contains f ".git/")
			     (string-contains f ".so")
			     (string-suffix? ".o" f)
			     (string-suffix? ".a" f)
			     (string-suffix? ".go" f)
			     (string-suffix? ".pdf" f)
			     (string-suffix? ".png" f)
			     (string-suffix? ".info" f)
			     (equal? (basename f) "guix-daemon")
			     (equal? (basename f) "nix-setuid-helper")
			     (string-contains f "nix-upstream/")
			     (string-contains f "distro/packages/bootstrap/")))
		       (find-files "." "\\.[a-z]+$"))
    (("^([[:graph:]]+) This file is part of Guix." _ comment-start)
     (string-append comment-start " This file is part of GNU Guix."))
    (("^([[:graph:]]+) Guix --- Nix package management.*" _ comment-start)
     (string-append comment-start
		    " GNU Guix --- Functional package management for GNU\n"))
    (("^([[:graph:]]+) Guix is " _ comment-start)
     (string-append comment-start " GNU Guix is "))
    (("^([[:graph:]]+) along with Guix." _ comment-start)
     (string-append comment-start " along with GNU Guix."))
    (("^([[:graph:]]+) Copyright \\(C\\)" _ comment-start)
     (string-append comment-start " Copyright ©")))

Change headers using C-style comments manually.

Merge branch 'master' into nix-integration

Conflicts:
	guix/store.scm

Add (guix gnu-maintenance).

* guix/gnu-maintenance.scm: New file.
* Makefile.am (MODULES): Add it.