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>

4 files changed, 360 insertions, 1 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 9e301d0072..b9d127c47c 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -17000,6 +17000,71 @@ Extra options will be passed to @code{git daemon}, please run
 @end table
 @end deftp
 
+@subsubheading Cgit Service
+
+@cindex Cgit service
+@cindex Git, web interface
+@uref{https://git.zx2c4.com/cgit/, Cgit} is a web frontend for Git
+repositories written in C.
+
+The following example will configure the service with default values.
+By default, Cgit can be accessed on port 80 (@code{http://localhost:80}).
+
+@example
+(service nginx-service-type)
+(service fcgiwrap-service-type)
+(service cgit-service-type)
+@end example
+
+@deftp {Data Type} cgit-configuration
+Data type representing the configuration of Cgit.
+This type has the following parameters:
+
+@table @asis
+@item @code{config-file} (default: @code{(cgit-configuration-file)})
+The configuration file to use for Cgit.  This can be set to a
+@dfn{cgit-configuration-file} record value, or any gexp
+(@pxref{G-Expressions}).
+
+For example, to instead use a local file, the @code{local-file} function
+can be used:
+
+@example
+(service cgit-service-type
+         (cgit-configuration
+           (config-file (local-file "./my-cgitrc.conf"))))
+@end example
+
+@item @code{package} (default: @code{cgit})
+The Cgit package to use.
+
+@end table
+@end deftp
+
+@deftp {Data Type} cgit-configuration-file
+Data type representing the configuration options for Cgit.
+This type has the following parameters:
+
+@table @asis
+@item @code{css} (default: @code{"/share/cgit/cgit.css"})
+URL which specifies the css document to include in all Cgit pages.
+
+@item @code{logo} (default: @code{"/share/cgit/cgit.png"})
+URL which specifies the source of an image which will be used as a logo
+on all Cgit pages.
+
+@item @code{virtual-root} (default: @code{"/"})
+URL which, if specified, will be used as root for all Cgit links.
+
+@item @code{repository-directory} (default: @code{"/srv/git"})
+Name of the directory to scan for repositories.
+
+@item @code{robots} (default: @code{(list "noindex" "nofollow")})
+Text used as content for the ``robots'' meta-tag.
+
+@end table
+@end deftp
+
 @node Setuid Programs
 @subsection Setuid Programs
 
diff --git a/gnu/local.mk b/gnu/local.mk
index edd6d8237e..cceada5ae6 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -501,6 +501,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/tests/networking.scm			\
   %D%/tests/rsync.scm				\
   %D%/tests/ssh.scm				\
+  %D%/tests/version-control.scm			\
   %D%/tests/virtualization.scm			\
   %D%/tests/web.scm
 
diff --git a/gnu/services/version-control.scm b/gnu/services/version-control.scm
index 107bc8e77a..e39f4411fd 100644
--- a/gnu/services/version-control.scm
+++ b/gnu/services/version-control.scm
@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2016 ng0 <ng0@we.make.ritual.n0.is>
 ;;; Copyright © 2016 Sou Bunnbu <iyzsong@member.fsf.org>
+;;; Copyright © 2017 Oleg Pykhalov <go.wigust@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -21,18 +22,40 @@
   #:use-module (gnu services)
   #:use-module (gnu services base)
   #:use-module (gnu services shepherd)
+  #:use-module (gnu services web)
   #:use-module (gnu system shadow)
   #:use-module (gnu packages version-control)
   #:use-module (gnu packages admin)
   #:use-module (guix records)
   #:use-module (guix gexp)
+  #:use-module (guix store)
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-26)
   #:use-module (ice-9 match)
   #:export (git-daemon-service
             git-daemon-service-type
             git-daemon-configuration
-            git-daemon-configuration?))
+            git-daemon-configuration?
+
+            <cgit-configuration-file>
+            cgit-configuration-file
+            cgit-configuration-file?
+            cgit-configuration-file-css
+            cgit-configuration-file-logo
+            cgit-configuration-file-robots
+            cgit-configuration-file-virtual-root
+            cgit-configuration-file-repository-directory
+
+            <cgit-configuration>
+            cgit-configuration
+            cgit-configuration?
+            cgit-configuration-config-file
+            cgit-configuration-package
+
+            %cgit-configuration-nginx
+            cgit-configuration-nginx-config
+
+            cgit-service-type))
 
 ;;; Commentary:
 ;;;
@@ -139,3 +162,97 @@ The optional @var{config} argument should be a
 @code{<git-daemon-configuration>} object, by default it allows read-only
 access to exported repositories under @file{/srv/git}."
   (service git-daemon-service-type config))
+
+
+;;;
+;;; Cgit
+;;;
+
+(define-record-type* <cgit-configuration-file>
+  cgit-configuration-file
+  make-cgit-configuration-file
+  cgit-configuration-file?
+  (css                  cgit-configuration-file-css                  ; string
+                        (default "/share/cgit/cgit.css"))
+  (logo                 cgit-configuration-file-logo                 ; string
+                        (default "/share/cgit/cgit.png"))
+  (robots               cgit-configuration-file-robots               ; list
+                        (default '("noindex" "nofollow")))
+  (virtual-root         cgit-configuration-file-virtual-root         ; string
+                        (default "/"))
+  (repository-directory cgit-configuration-file-repository-directory ; string
+                        (default "/srv/git")))
+
+(define (cgit-configuration-robots-string robots)
+  (string-join robots ", "))
+
+(define-gexp-compiler (cgit-configuration-file-compiler
+                       (file <cgit-configuration-file>) system target)
+  (match file
+    (($ <cgit-configuration-file> css logo
+                                  robots virtual-root repository-directory)
+     (apply text-file* "cgitrc"
+            (letrec-syntax ((option (syntax-rules ()
+                                      ((_ key value)
+                                       (if value
+                                           `(,key "=" ,value "\n")
+                                           '()))))
+                            (key/value (syntax-rules ()
+                                         ((_ (key value) rest ...)
+                                          (append (option key value)
+                                                  (key/value rest ...)))
+                                         ((_)
+                                          '()))))
+              (key/value ("css" css)
+                         ("logo" logo)
+                         ("robots" (cgit-configuration-robots-string robots))
+                         ("virtual-root" virtual-root)
+                         ("scan-path" repository-directory)))))))
+
+(define %cgit-configuration-nginx
+  (list
+   (nginx-server-configuration
+    (root cgit)
+    (locations
+     (list
+      (nginx-location-configuration
+       (uri "@cgit")
+       (body '("fastcgi_param SCRIPT_FILENAME $document_root/lib/cgit/cgit.cgi;"
+               "fastcgi_param PATH_INFO $uri;"
+               "fastcgi_param QUERY_STRING $args;"
+               "fastcgi_param HTTP_HOST $server_name;"
+               "fastcgi_pass 127.0.0.1:9000;")))))
+    (try-files (list "$uri" "@cgit"))
+    (https-port #f)
+    (ssl-certificate #f)
+    (ssl-certificate-key #f))))
+
+(define-record-type* <cgit-configuration>
+  cgit-configuration make-cgit-configuration
+  cgit-configuration?
+  (config-file cgit-configuration-config-file
+               (default (cgit-configuration-file)))
+  (package cgit-configuration-package
+           (default cgit))
+  (nginx cgit-configuration-nginx
+         (default %cgit-configuration-nginx)))
+
+(define (cgit-activation config)
+  ;; Cgit compiled with default configuration path
+  #~(begin
+      (use-modules (guix build utils))
+      (mkdir-p "/var/cache/cgit")
+      (copy-file #$(cgit-configuration-config-file config) "/etc/cgitrc")))
+
+(define (cgit-configuration-nginx-config config)
+  (cgit-configuration-nginx config))
+
+(define cgit-service-type
+  (service-type
+   (name 'cgit)
+   (extensions
+    (list (service-extension activation-service-type
+                             cgit-activation)
+          (service-extension nginx-service-type
+                             cgit-configuration-nginx-config)))
+   (default-value (cgit-configuration))))
diff --git a/gnu/tests/version-control.scm b/gnu/tests/version-control.scm
new file mode 100644
index 0000000000..5a3937cfed
--- /dev/null
+++ b/gnu/tests/version-control.scm
@@ -0,0 +1,176 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2017 Oleg Pykhalov <go.wigust@gmail.com>
+;;; Copyright © 2017 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu tests version-control)
+  #:use-module (gnu tests)
+  #:use-module (gnu system)
+  #:use-module (gnu system file-systems)
+  #:use-module (gnu system shadow)
+  #:use-module (gnu system vm)
+  #:use-module (gnu services)
+  #:use-module (gnu services version-control)
+  #:use-module (gnu services web)
+  #:use-module (gnu services networking)
+  #:use-module (gnu packages version-control)
+  #:use-module (guix gexp)
+  #:use-module (guix store)
+  #:export (%test-cgit))
+
+(define %make-git-repository
+  ;; Create Git repository in /srv/git/test.
+  #~(begin
+      (mkdir-p "/srv/git/test")
+      (system* (string-append #$git "/bin/git") "-C" "/srv/git/test"
+               "init" "--bare")))
+
+(define %cgit-configuration-nginx
+  (list
+   (nginx-server-configuration
+    (root cgit)
+    (locations
+     (list
+      (nginx-location-configuration
+       (uri "@cgit")
+       (body '("fastcgi_param SCRIPT_FILENAME $document_root/lib/cgit/cgit.cgi;"
+               "fastcgi_param PATH_INFO $uri;"
+               "fastcgi_param QUERY_STRING $args;"
+               "fastcgi_param HTTP_HOST $server_name;"
+               "fastcgi_pass 127.0.0.1:9000;")))))
+    (try-files (list "$uri" "@cgit"))
+    (http-port 19418)
+    (https-port #f)
+    (ssl-certificate #f)
+    (ssl-certificate-key #f))))
+
+(define %cgit-os
+  ;; Operating system under test.
+  (let ((base-os
+         (simple-operating-system
+          (dhcp-client-service)
+          (service nginx-service-type)
+          (service fcgiwrap-service-type)
+          (service cgit-service-type
+                   (cgit-configuration
+                    (nginx %cgit-configuration-nginx)))
+          (simple-service 'make-git-repository activation-service-type
+                          %make-git-repository))))
+    (operating-system
+      (inherit base-os)
+      (packages (cons* git
+                       (operating-system-packages base-os))))))
+
+(define* (run-cgit-test #:optional (http-port 19418))
+  "Run tests in %CGIT-OS, which has nginx running and listening on
+HTTP-PORT."
+  (define os
+    (marionette-operating-system
+     %cgit-os
+     #:imported-modules '((gnu services herd)
+                          (guix combinators))))
+
+  (define vm
+    (virtual-machine
+     (operating-system os)
+     (port-forwardings `((8080 . ,http-port)))))
+
+  (define test
+    (with-imported-modules '((gnu build marionette))
+      #~(begin
+          (use-modules (srfi srfi-11) (srfi srfi-64)
+                       (gnu build marionette)
+                       (web uri)
+                       (web client)
+                       (web response))
+
+          (define marionette
+            (make-marionette (list #$vm)))
+
+          (mkdir #$output)
+          (chdir #$output)
+
+          (test-begin "cgit")
+
+          ;; Wait for nginx to be up and running.
+          (test-eq "service running"
+            'running!
+            (marionette-eval
+             '(begin
+                (use-modules (gnu services herd))
+                (start-service 'nginx)
+                'running!)
+             marionette))
+
+          ;; Wait for fcgiwrap to be up and running.
+          (test-eq "service running"
+            'running!
+            (marionette-eval
+             '(begin
+                (use-modules (gnu services herd))
+                (start-service 'fcgiwrap)
+                'running!)
+             marionette))
+
+          ;; Make sure the PID file is created.
+          (test-assert "PID file"
+            (marionette-eval
+             '(file-exists? "/var/run/nginx/pid")
+             marionette))
+
+          ;; Make sure the configuration file is created.
+          (test-assert "configuration file"
+            (marionette-eval
+             '(file-exists? "/etc/cgitrc")
+             marionette))
+
+          ;; Make sure Git test repository is created.
+          (test-assert "Git test repository"
+            (marionette-eval
+             '(file-exists? "/srv/git/test")
+             marionette))
+
+          ;; Make sure we can access pages that correspond to our repository.
+          (letrec-syntax ((test-url
+                           (syntax-rules ()
+                             ((_ path code)
+                              (test-equal (string-append "GET " path)
+                                code
+                                (let-values (((response body)
+                                              (http-get (string-append
+                                                         "http://localhost:8080"
+                                                         path))))
+                                  (response-code response))))
+                             ((_ path)
+                              (test-url path 200)))))
+            (test-url "/")
+            (test-url "/test")
+            (test-url "/test/log")
+            (test-url "/test/tree")
+            (test-url "/test/does-not-exist" 404)
+            (test-url "/does-not-exist" 404))
+
+          (test-end)
+          (exit (= (test-runner-fail-count (test-runner-current)) 0)))))
+
+  (gexp->derivation "cgit-test" test))
+
+(define %test-cgit
+  (system-test
+   (name "cgit")
+   (description "Connect to a running Cgit server.")
+   (value (run-cgit-test))))