guix: Add maven-build-system.

* guix/build-system/maven.scm: New file.
* guix/build/maven-build-system.scm: New file.
* Makefile.am (MODULES): Add them.
* doc/guix.texi (Build Systems): Document the maven build system.

1 files changed, 163 insertions, 0 deletions

diff --git a/guix/build/maven-build-system.scm b/guix/build/maven-build-system.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 Julien Lepiller <julien@lepiller.eu>
+;;;
+;;; 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 maven-build-system)
+  #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module (guix build utils)
+  #:use-module (guix build maven pom)
+  #:use-module (ice-9 match)
+  #:export (%standard-phases
+            maven-build))
+
+;; Commentary:
+;;
+;; Builder-side code of the standard maven build procedure.
+;;
+;; Code:
+
+(define* (set-home #:key outputs inputs #:allow-other-keys)
+  (let ((home (string-append (getcwd) "/build-home")))
+    (setenv "HOME" home))
+  (setenv "JAVA_HOME" (assoc-ref inputs "jdk"))
+  #t)
+
+(define* (configure #:key inputs #:allow-other-keys)
+  (let* ((m2-files (map
+                     (lambda (input)
+                       (match input
+                         ((name . dir)
+                          (let ((m2-dir (string-append dir "/lib/m2")))
+                            (if (file-exists? m2-dir) m2-dir #f)))))
+                     inputs))
+         (m2-files (filter (lambda (a) a) m2-files)))
+    (for-each
+      (lambda (m2-dir)
+        (for-each
+          (lambda (file)
+            (let ((dir (string-append (getenv "HOME") "/.m2/repository/"
+                                      (dirname file))))
+              (mkdir-p dir)
+              (symlink (string-append m2-dir "/" file)
+                       (string-append dir "/" (basename file)))))
+          (with-directory-excursion m2-dir
+            (find-files "." ".*.(jar|pom)$"))))
+      m2-files))
+  (invoke "mvn" "-v")
+  #t)
+
+(define (add-local-package local-packages group artifact version)
+  (define (alist-set lst key val)
+    (match lst
+      ('() (list (cons key val)))
+      (((k . v) lst ...)
+       (if (equal? k key)
+         (cons (cons key val) lst)
+         (cons (cons k v) (alist-set lst key val))))))
+  (alist-set local-packages group
+    (alist-set (or (assoc-ref local-packages group) '()) artifact
+      version)))
+
+(define (fix-pom pom-file inputs local-packages excludes)
+  (chmod pom-file #o644)
+  (format #t "fixing ~a~%" pom-file)
+  (fix-pom-dependencies pom-file (map cdr inputs)
+                        #:with-plugins? #t #:with-build-dependencies? #t
+                        #:local-packages local-packages
+                        #:excludes excludes)
+  (let* ((pom (get-pom pom-file))
+         (java-inputs (map cdr inputs))
+         (artifact (pom-artifactid pom))
+         (group (pom-groupid pom java-inputs local-packages))
+         (version (pom-version pom java-inputs local-packages)))
+    (let loop ((modules (pom-ref pom "modules"))
+               (local-packages
+                 (add-local-package local-packages group artifact version)))
+      (pk 'local-packages local-packages)
+      (match modules
+        (#f local-packages)
+        ('() local-packages)
+        (((? string? _) modules ...)
+         (loop modules local-packages))
+        (((_ module) modules ...)
+         (loop
+           modules
+           (fix-pom (string-append (dirname pom-file) "/" module "/pom.xml")
+                    inputs local-packages excludes)))))))
+
+(define* (fix-pom-files #:key inputs local-packages exclude #:allow-other-keys)
+  (fix-pom "pom.xml" inputs local-packages exclude))
+
+(define* (build #:key outputs #:allow-other-keys)
+  "Build the given package."
+  (invoke "mvn" "package"
+          ;; offline mode: don't download dependencies
+          "-o"
+          ;, set directory where dependencies are installed
+          (string-append "-Duser.home=" (getenv "HOME")))
+  #t)
+
+(define* (check #:key tests? #:allow-other-keys)
+  "Check the given package."
+  (when tests?
+    (invoke "mvn" "test"
+            (string-append "-Duser.home=" (getenv "HOME"))
+            "-e"))
+  #t)
+
+(define* (install #:key outputs #:allow-other-keys)
+  "Install the given package."
+  (let* ((out (assoc-ref outputs "out"))
+         (java (string-append out "/lib/m2")))
+    (invoke "mvn" "install" "-o" "-e"
+            "-DskipTests"
+            (string-append "-Duser.home=" (getenv "HOME")))
+    ;; Go through the repository to find files that can be installed
+    (with-directory-excursion (string-append (getenv "HOME") "/.m2/repository")
+      (let ((installable
+              (filter (lambda (file)
+                        (not (eq? 'symlink (stat:type (lstat file)))))
+                      (find-files "." "."))))
+        (mkdir-p java)
+        (for-each
+          (lambda (file)
+            (mkdir-p (string-append java "/" (dirname file)))
+            (copy-file file (string-append java "/" file)))
+          installable)))
+    ;; Remove some files that are not required and introduce timestamps
+    (for-each delete-file (find-files out "maven-metadata-local.xml"))
+    (for-each delete-file (find-files out "_remote.repositories")))
+  #t)
+
+(define %standard-phases
+  ;; Everything is as with the GNU Build System except for the `configure'
+  ;; , `build', `check' and `install' phases.
+  (modify-phases gnu:%standard-phases
+    (delete 'bootstrap)
+    (add-before 'configure 'set-home set-home)
+    (replace 'configure configure)
+    (add-after 'configure 'fix-pom-files fix-pom-files)
+    (replace 'build build)
+    (replace 'check check)
+    (replace 'install install)))
+
+(define* (maven-build #:key inputs (phases %standard-phases)
+                      #:allow-other-keys #:rest args)
+  "Build the given package, applying all of PHASES in order."
+  (apply gnu:gnu-build #:inputs inputs #:phases phases args))
+
+;;; maven-build-system.scm ends here