nonguix: Add chromium-binary-build-system.

This build system is an extension to the binary-build-system, designed
to abstract some common boilerplate necessary for packaging Chromium
based software.

* nonguix/build-system/chromium-binary.scm: New file;
* nonguix/build/chromium-binary-build-system.scm: new file;
* nonguix/build/utils.scm (build-paths-for-input): new variable;
(build-paths-from-inputs): New variable.

Signed-off-by: Jonathan Brielmaier <jonathan.brielmaier@web.de>

2 files changed, 99 insertions, 1 deletions

diff --git a/nonguix/build/chromium-binary-build-system.scm b/nonguix/build/chromium-binary-build-system.scm
new file mode 100644
index 0000000..0fed9bf
--- /dev/null
+++ b/nonguix/build/chromium-binary-build-system.scm
@@ -0,0 +1,75 @@
+;;; SPDX-License-Identifier: GPL-3.0-or-later
+;;; Copyright © 2023 Giacomo Leidi <goodoldpaul@autistici.org>
+
+(define-module (nonguix build chromium-binary-build-system)
+  #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module ((nonguix build binary-build-system) #:prefix binary:)
+  #:use-module (nonguix build utils)
+  #:use-module (guix build utils)
+  #:use-module (ice-9 ftw)
+  #:use-module (ice-9 match)
+  #:export (%standard-phases
+            chromium-binary-build))
+
+;; Commentary:
+;;
+;; Builder-side code of the Chromium binary build procedure.
+;;
+;; Code:
+
+(define* (install-wrapper #:key inputs outputs #:allow-other-keys)
+  (let* ((output (assoc-ref outputs "out"))
+         (bin (string-append output "/bin"))
+         (fontconfig-minimal (assoc-ref inputs "fontconfig"))
+         (nss (assoc-ref inputs "nss"))
+         (wrap-inputs (map cdr inputs))
+         (lib-directories
+          (build-paths-from-inputs '("lib") wrap-inputs))
+         (bin-directories
+          (build-paths-from-inputs
+           '("bin" "sbin" "libexec")
+           wrap-inputs)))
+    (for-each
+     (lambda (exe)
+       (display (string-append "Wrapping " exe "\n"))
+       (wrap-program exe
+        `("FONTCONFIG_PATH" ":" prefix
+          (,(string-join
+             (list
+              (string-append fontconfig-minimal "/etc/fonts")
+              output)
+             ":")))
+        `("PATH" ":" prefix
+          (,(string-join
+             (append
+              bin-directories
+              (list
+               bin))
+             ":")))
+        `("LD_LIBRARY_PATH" ":" prefix
+          (,(string-join
+             (append
+              lib-directories
+              (list
+               (string-append nss "/lib/nss")
+               output))
+             ":")))))
+     (map
+      (lambda (exe) (string-append bin "/" exe))
+      (filter
+       (lambda (exe) (not (string-prefix? "." exe)))
+       (scandir bin))))
+    #t))
+
+(define %standard-phases
+  ;; Everything is as with the binary-build-system except for the
+  ;; `install-wrapper' phase.
+  (modify-phases binary:%standard-phases
+    (add-after 'install 'install-wrapper install-wrapper)))
+
+(define* (chromium-binary-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))
+
+;;; chromium-binary-build-system.scm ends here
diff --git a/nonguix/build/utils.scm b/nonguix/build/utils.scm
index fd92a12..e7d6966 100644
--- a/nonguix/build/utils.scm
+++ b/nonguix/build/utils.scm
@@ -1,15 +1,18 @@
 ;;; SPDX-License-Identifier: GPL-3.0-or-later
 ;;; Copyright © 2019 Pierre Neidhardt <mail@ambrevar.xyz>
 ;;; Copyright © 2020 Alex Griffin <a@ajgrf.com>
+;;; Copyright © 2023 Giacomo Leidi <goodoldpaul@autistici.org>
 
 (define-module (nonguix build utils)
   #:use-module (ice-9 match)
   #:use-module (ice-9 binary-ports)
   #:use-module (guix build utils)
+  #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-26)
   #:export (64-bit?
             make-wrapper
-            concatenate-files))
+            concatenate-files
+            build-paths-from-inputs))
 
 (define (64-bit? file)
   "Return true if ELF file is in 64-bit format, false otherwise.
@@ -94,3 +97,23 @@ contents:
   (call-with-output-file result
     (lambda (port)
       (for-each (cut dump <> port) files))))
+
+(define build-paths-for-input
+  (lambda (dirs input)
+    (filter-map
+     (lambda (sub-directory)
+       (let ((directory
+              (string-append
+               input "/" sub-directory)))
+         (and
+          (directory-exists? directory)
+          directory)))
+     dirs)))
+
+(define build-paths-from-inputs
+  (lambda (dirs inputs)
+    (reduce append '()
+            (map
+             (lambda (input)
+               (build-paths-for-input dirs input))
+             inputs))))