build: Add Ant build system.

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

1 files changed, 160 insertions, 0 deletions

diff --git a/guix/build/ant-build-system.scm b/guix/build/ant-build-system.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
+;;;
+;;; 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 (guix build ant-build-system)
+  #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module (guix build syscalls)
+  #:use-module (guix build utils)
+  #:use-module (sxml simple)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 ftw)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:export (%standard-phases
+            ant-build))
+
+;; Commentary:
+;;
+;; Builder-side code of the standard build procedure for Java packages using
+;; Ant.
+;;
+;; Code:
+
+(define (default-build.xml jar-name prefix)
+  "Create a simple build.xml with standard targets for Ant."
+  (call-with-output-file "build.xml"
+    (lambda (port)
+      (sxml->xml
+       `(project (@ (basedir "."))
+                 (property (@ (name "classes.dir")
+                              (value "${basedir}/build/classes")))
+                 (property (@ (name "jar.dir")
+                              (value "${basedir}/build/jar")))
+                 (property (@ (name "dist.dir")
+                              (value ,prefix)))
+
+                 ;; respect the CLASSPATH environment variable
+                 (property (@ (name "build.sysclasspath")
+                              (value "first")))
+                 (property (@ (environment "env")))
+                 (path (@ (id "classpath"))
+                       (pathelement (@ (location "${env.CLASSPATH}"))))
+
+                 (target (@ (name "compile"))
+                         (mkdir (@ (dir "${classes.dir}")))
+                         (javac (@ (includeantruntime "false")
+                                   (srcdir "src")
+                                   (destdir "${classes.dir}")
+                                   (classpath (@ (refid "classpath"))))))
+
+                 (target (@ (name "jar")
+                            (depends "compile"))
+                         (mkdir (@ (dir "${jar.dir}")))
+                         ;; We cannot use the simpler "jar" task here, because
+                         ;; there is no way to disable generation of a
+                         ;; manifest.  We do not include a generated manifest
+                         ;; to ensure determinism, because we cannot easily
+                         ;; reset the ctime/mtime before creating the archive.
+                         (exec (@ (executable "jar"))
+                               (arg (@ (line ,(string-append "-Mcf ${jar.dir}/" jar-name
+                                                             " -C ${classes.dir} ."))))))
+
+                 (target (@ (name "install"))
+                         (copy (@ (todir "${dist.dir}"))
+                               (fileset (@ (dir "${jar.dir}"))
+                                        (include (@ (name "**/*.jar")))))))
+       port)))
+  (utime "build.xml" 0 0)
+  #t)
+
+(define (generate-classpath inputs)
+  "Return a colon-separated string of full paths to jar files found among the
+INPUTS."
+  (string-join
+   (apply append (map (match-lambda
+                        ((_ . dir)
+                         (find-files dir "\\.*jar$")))
+                      inputs)) ":"))
+
+(define* (configure #:key inputs outputs (jar-name #f)
+                    #:allow-other-keys)
+  (when jar-name
+    (default-build.xml jar-name
+                       (string-append (assoc-ref outputs "out")
+                                      "/share/java")))
+  (setenv "JAVA_HOME" (assoc-ref inputs "jdk"))
+  (setenv "CLASSPATH" (generate-classpath inputs)))
+
+(define* (build #:key (make-flags '()) (build-target "jar")
+                #:allow-other-keys)
+  (zero? (apply system* `("ant" ,build-target ,@make-flags))))
+
+(define* (strip-jar-timestamps #:key outputs
+                 #:allow-other-keys)
+  "Unpack all jar archives, reset the timestamp of all contained files, and
+repack them.  This is necessary to ensure that archives are reproducible."
+  (define (repack-archive jar)
+    (format #t "repacking ~a\n" jar)
+    (let ((dir (mkdtemp! "jar-contents.XXXXXX")))
+      (and (with-directory-excursion dir
+             (zero? (system* "jar" "xf" jar)))
+           ;; The manifest file contains timestamps
+           (for-each delete-file (find-files dir "MANIFEST.MF"))
+           (delete-file jar)
+           ;; XXX: copied from (gnu build install)
+           (for-each (lambda (file)
+                       (let ((s (lstat file)))
+                         (unless (eq? (stat:type s) 'symlink)
+                           (utime file 0 0 0 0))))
+                     (find-files dir #:directories? #t))
+           (unless (zero? (system* "jar" "-Mcf" jar "-C" dir "."))
+             (error "'jar' failed"))
+           (utime jar 0 0)
+           #t)))
+
+  (every (match-lambda
+           ((output . directory)
+            (every repack-archive (find-files directory "\\.jar$"))))
+         outputs))
+
+(define* (check #:key target (make-flags '()) (tests? (not target))
+                (test-target "check")
+                #:allow-other-keys)
+  (if tests?
+      (zero? (apply system* `("ant" ,test-target ,@make-flags)))
+      (begin
+        (format #t "test suite not run~%")
+        #t)))
+
+(define* (install #:key (make-flags '()) #:allow-other-keys)
+  (zero? (apply system* `("ant" "install" ,@make-flags))))
+
+(define %standard-phases
+  (modify-phases gnu:%standard-phases
+    (replace 'configure configure)
+    (replace 'build build)
+    (replace 'check check)
+    (replace 'install install)
+    (add-after 'install 'strip-jar-timestamps strip-jar-timestamps)))
+
+(define* (ant-build #:key inputs (phases %standard-phases)
+                    #:allow-other-keys #:rest args)
+  "Build the given Java package, applying all of PHASES in order."
+  (apply gnu:gnu-build #:inputs inputs #:phases phases args))
+
+;;; ant-build-system.scm ends here