gnu: rdup: Fix tests.

* gnu/packages/backup.scm (rdup) [arguments]: Add pre-check phase.
  [origin]: Add snippet.

build-system/gnu: Add #:allowed-references.

* guix/build-system/gnu.scm (gnu-build): Add #:allowed-references.
  [canonicalize-reference]: New procedure.
  Pass #:allowed-references to 'build-expression->derivation'.
  (gnu-cross-build): Likewise.

derivations: 'build-expression->derivation' supports #:allowed-references.

* guix/derivations.scm (build-expression->derivation): Add
  #:allowed-references and pass it to 'derivation.
* doc/guix.texi (Derivations): Adjust accordingly.

services: Use a fixed GID for the build group and use that for the store.

This partly reverts commit 185f669 ("services: Make sure the store's
group is the build group.")

* gnu/services/base.scm (guix-service)[activate]: Remove 'chown' call.
  Add 'id' field to 'user-group' form.
* guix/build/install.scm (directives): Set the store's GID to 30000.

gnu: Add WakeLan.

* gnu/packages/admin.scm (wakelan): New variable.

gnu: openssl: Upgrade to 1.0.1h.

* gnu/packages/openssl.scm (openssl): Upgrade to 1.0.1h.  Remove
  patches, which are now upstream.
* gnu/packages/patches/openssl-extension-checking-fixes.patch: Remove.
* gnu/packages/patches/openssl-CVE-2010-5298.patch: Remove.
* gnu-system.am (dist_patch_DATA): Remove them.

gnu: bdb: Move documentation to "doc" output.

* gnu/packages/bdb.scm (bdb): Add 'outputs' field.  Adjust 'configure'
  phase to move documentation to the "doc" output.

gnu: Set proper source location for 'gcc-final'.

* gnu/packages/base.scm (gcc-final)[location]: New field.
  Reported by Andreas Enge <andreas@enge.fr>.

install: Add missing argv[0] in Info invocation.

* gnu/system/install.scm (log-to-info): Add "info" as second argument to
  'execl'.

activation: Only create groups that do not exist yet.

Before that the effect would be to re-create groups at each boot, and
thus remove any members of the groups.

* guix/build/activation.scm (activate-users+groups): Call 'add-group'
  only when (getgrname name) fails.

services: Make sure the store's group is the build group.

* gnu/services/base.scm (guix-service)[activate]: New variable.  Add
  'chown' call for (%store-prefix).  Set the 'activate' field to
  ACTIVATE.
* guix/build/install.scm (directives): Add comment about STORE's group.

services: Add the build group to the supplementary groups of build users.

* gnu/services/base.scm (guix-build-accounts): Add
  'supplementary-groups' field.

tests: Skip tests that would hit the shebang length limitation.

* tests/gexp.scm (shebang): New variable.
  Skip "gexp->script" when SHEBANG is longer than 127 chars.
* guix/gexp.scm (gexp->script): Add comment on the issue.

system: Tell module-init-tools where to look for modules.

* gnu/packages/linux.scm (module-init-tools)[source](patches): New
  field.
* gnu/packages/patches/module-init-tools-moduledir.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/system.scm (etc-directory): Add #:kernel parameter.  Set
  'LINUX_MODULE_DIRECTORY' in bashrc.
  (operating-system-etc-directory): Pass #:kernel to 'etc-directory'.

system: Rename activation script.

* gnu/system.scm (operating-system-activation-script): Change file name
  to "activate".

vm: Add #:name parameter for 'system-disk-image'.

* gnu/system/vm.scm (system-disk-image): Add #:name parameter; pass it
  to 'qemu-image'.

install: Register the hydra.gnu.org key on the installation image.

* gnu/services/base.scm (hydra-key-authorization): New procedure.
  (guix-service): Add #:authorize-hydra-key? parameter; honor it using
  'hydra-key-authorization'.
* gnu/system/install.scm (installation-services): Pass
  #:authorize-hydra-key? #t.

gnu: guix: Use /etc as sysconfdir.

* gnu/packages/package-management.scm (guix)[arguments]: Pass
  --sysconfdir=/etc.

system: Define '%base-packages' and use it.

* gnu/system.scm (<operating-system>)[packages]: Change default value to
  %BASE-PACKAGES.
  (%base-packages): New variable.
* gnu/system/install.scm (installation-os): Use it when defining the
  'packages' field.
* doc/guix.texi (Using the Configuration System): Use %BASE-PACKAGES in
  example.  Remove now unneeded module imports.  Explain this.

gnu: gnutls: Upgrade to 3.2.15.

* gnu/packages/gnutls.scm (gnutls): Upgrade to 3.2.15.