gexp: Add 'directory-union'.

* gnu/services.scm (directory-union): Move to...
* guix/gexp.scm (directory-union): ... here.  New procedure.
* doc/guix.texi (G-Expressions): Document it.

gexp: Add 'file-union'.

* gnu/services.scm (file-union): Move to...
* guix/gexp.scm (file-union): ... here.  New procedure.
* doc/guix.texi (G-Expressions): Document it.

services: base: Add file->udev-rule function.

This function allows passing a file-like object to the udev service.

* gnu/services/base.scm (file->udev-rule): New function.
* doc/guix.texi (Base Services): Document it.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

doc: Clarify description of etc-service-type.

* doc/guix.texi (Service Reference): Update 'etc-service-type'
  documentation.

Use HTTPS for bioconductor.org.

* doc/guix.texi (Invoking guix import, Invoking guix refresh): Use HTTPS for
bioconductor.org URLs.
* gnu/packages/bioinformatics.scm (r-annotate, r-geneplotter, r-genefilter)
(r-deseq2, r-dexseq, r-annotationforge, r-rbgl, r-gseabase, r-category)
(r-gostats, r-shortread, r-biocgenerics, r-biocinstaller, r-biocviews)
(r-biocstyle, r-bioccheck, r-s4vectors, r-iranges, r-genomeinfodbdata)
(r-genomeinfodb, r-xvector, r-genomicranges, r-biobase, r-annotationdbi)
(r-biomart, r-biocparallel, r-biostrings, r-rsamtools, r-delayedarray)
(r-summarizedexperiment, r-genomicalignments, r-rtracklayer)
(r-genomicfeatures, r-graph, r-topgo, r-bsgenome, r-impute, r-seqpattern)
(r-seqlogo, r-motifrg, r-bamsignals, r-mutationalpatterns, r-tximport)
(r-rhdf5, r-chipseq, r-sva, r-affy, r-vsn, r-mzid, r-msnid)
(r-interactivedisplaybase, r-annotationhub)[home-page]: Likewise.
* gnu/packages/bioinformatics.scm (r-txdb-hsapiens-ucsc-hg19-knowngene)
(r-go-db, r-bsgenome-hsapiens-1000genomes-hs37d5, r-org-hs-eg-db)
(r-org-ce-eg-db, r-org-dm-eg-db, r-org-mm-eg-db)
(r-bsgenome-hsapiens-ucsc-hg19, r-bsgenome-mmusculus-ucsc-mm9)
(r-bsgenome-mmusculus-ucsc-mm10, r-txdb-mmusculus-ucsc-mm10-knowngene)
(r-bsgenome-celegans-ucsc-ce6, r-bsgenome-celegans-ucsc-ce10)
(r-bsgenome-dmelanogaster-ucsc-dm3, r-copyhelper)[source, home-page]:
Likewise.
* gnu/packages/statistics.scm (r-rcurl)[source]: Likewise.
* guix/build-system/r.scm (bioconductor-uri): Likewise.
* guix/import/cran.scm (%cran-url, bioconductor-package?)
(bioconductor-data-package?, bioconductor-experiment-package?): Likewise.

doc: Add an example to the documentation of the udev-service.

* doc/guix.texi (Base Services): Update 'udev-service' documentation.

build: Add the Go build system.

* guix/build-system/go.scm,
guix/build/go-build-system.scm: New files.
* Makefile.am (MODULES): Add new files.
* doc/guix.texi (Build Systems): Document the go-build-system.

doc: Give an example with a FAT UUID.

* gnu/system/examples/lightweight-desktop.tmpl <file-systems>: Add a
UUID for the /boot/efi partition.
* doc/guix.texi (Using the Configuration System): Mention it.

pull: Add GUIX_PULL_URL environment variable.

* guix/scripts/pull.scm (%repository-url): Add GUIX_PULL_URL environment
  variable.
* doc/guix.texi (Invoking guix pull): Mention GUIX_PULL_URL.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

Merge branch 'master' into staging

services: Add MongoDB.

* gnu/services/databases.scm (%default-mongodb-configuration-file,
  %mongodb-accounts, mongodb-service-type): New variables.
  (<mongodb-configuration>): New record type.
  (mongodb-activation, mongodb-shepherd-service): New procedures.
* gnu/tests/databases.scm (%test-mongodb): New variable.
* doc/guix.texi (Database Services): Add MongoDB documentation.

Merge branch 'master' into staging

guix: ant-build-system: Add #:test-include and #:test-exclude arguments.

* guix/build-system/ant.scm: Add #:test-include and #:test-exclude
arguments.
* guix/build/ant-build-system.scm: Generate test list from arguments.
* doc/guix.texi (Build Systems): Document it.

guix: ant-build-system: Add main-class support.

* guix/build-system/ant.scm: New #:main-class argument
* guix/build/ant-build-system.scm: Generate a manifest file with
additional properties.
* doc/guix.texi (Build Systems): Document it.

gnu: services: Add cgit.

* gnu/services/version-control.scm
(<cgit-configuration-file>, <cgit-configuration>): New record types.
(cgit-configuration-robots-string, cgit-activation,
cgit-configuration-nginx-config): New procedures.
(%cgit-configuration-nginx, cgit-service-type): New variables.
* gnu/tests/version-control.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* doc/guix.texi (Version Control): Document the cgit service.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

doc: Explain why synopses/descriptions must be literal strings.

Suggested by Dave Love <fx@gnu.org>.

* doc/guix.texi (Synopses and Descriptions): Recommend literal strings.

doc: Fix rottlog configuration sample code.

* doc/guix.texi (Log Rotation): Correct code for the default mcron-service.

services: web: Add try-files for the nginx-service-type.

* gnu/services/web.scm (<nginx-server-configuration>): Add
  nginx-server-configuration-try-files.
(emit-nginx-server-config): Use it.
* doc/guix.texi (Web Services): Document it.

import: Add JSON importer.

* doc/guix.texi (Invoking guix import): Document it.
* guix/scripts/import/json.scm: New file.
* Makefile.am (MODULES): Add it.
* guix/scripts/import.scm (importers): Add json importer.

cuirass: Add gnu-system build spec.

* build-aux/hydra/gnu-system.scm (hydra-jobs): Support subset "hello".
* build-aux/cuirass/gnu-system.scm: New file.
* doc/guix.texi (Continuous Integration): Update example spec.