gnu: icecat: Support Guix packaged extensions and native manifests.

* gnu/build/icecat-extension.scm: New file with a MAKE-ICECAT-EXTENSION
procedure that makes sure the add-on directory is a symlink, so that Icecat
can normalize it into a package store path.
* gnu/local.mk (dist_patch_DATA): Register it, as well as new patches.
* gnu/packages/browser-extensions.scm (ublock-origin)[properties]: Store the
add-on ID so that it is accessible in MAKE-ICECAT-EXTENSION.
[arguments]: Use the add-on ID as root directory.
(ublock-origin/icecat): New procedure.
* gnu/packages/gnuzilla.scm (icecat-minimal)[arguments]: Rewrite the unused
'apply-guix-specific-patches' phase so that it applies the following two
patches.
[native-search-paths]: New field.
* gnu/packages/patches/icecat-compare-paths.patch: New patch that compares
add-on paths (which are package store paths) to detect package changes.
* gnu/packages/patches/icecat-use-system-wide-dir.patch: New patch that
replaces "/usr/lib/mozilla" (the system-wide directory for extensions and
native manifests) with "$ICECAT_SYSTEM_DIR".

1 files changed, 70 insertions, 0 deletions

diff --git a/gnu/build/icecat-extension.scm b/gnu/build/icecat-extension.scm
new file mode 100644
index 00000000000..1e6a9a54e4b
--- /dev/null
+++ b/gnu/build/icecat-extension.scm
@@ -0,0 +1,70 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020, 2021 Marius Bakke <marius@gnu.org>
+;;; Copyright © 2023 Clément Lassieur <clement@lassieur.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 build icecat-extension)
+  #:use-module (guix gexp)
+  #:use-module (guix packages)
+  #:use-module (guix build-system trivial)
+  #:export (make-icecat-extension))
+
+(define* (make-icecat-extension pkg #:optional (pkg-output "out"))
+  "Create an Icecat extension from package PKG and return a package that,
+when installed, will make the extension contained in PKG available as an
+Icecat browser extension.  PKG-OUTPUT specifies which output of PKG to use."
+  (package
+    (inherit pkg)
+    (name (string-append (package-name pkg) "-icecat"))
+    (native-inputs '())
+    (inputs '())
+    (propagated-inputs (package-propagated-inputs pkg))
+    (outputs '("out"))
+    (build-system trivial-build-system)
+    (arguments
+     (list
+      #:modules '((guix build utils))
+      #:builder
+      #~(begin
+          (use-modules (guix build utils))
+          (let* ((addon-id #$(assq-ref (package-properties pkg) 'addon-id))
+                 (moz-app-id "{ec8030f7-c20a-464f-9b0e-13a3a9e97384}")
+                 (search-dir (string-append #$output "/lib/icecat/extensions/"
+                                            moz-app-id)))
+            ;; Icecat's iterates over `search-dir` for directories.  If a
+            ;; directory's name is not a valid add-on ID, it is ignored.  See
+            ;; `DirectoryLocation::readAddons()` in XPIProvider.jsm.
+
+            ;; This directory has to be a symlink, because Icecat's
+            ;; `_readLinkFile(aFile)` calls `normalize()` only if `aFile` is a
+            ;; symlink.
+
+            ;; Normalizing is required because Icecat compares the add-on path
+            ;; against its local database to know if there is an extension
+            ;; update.  We want the add-on path to be the package store path,
+            ;; so that a path change is detected every time the package is
+            ;; updated.  See `updateExistingAddon()` in XPIDatabase.jsm, with
+            ;; our patch `icecat-compare-paths.patch`.
+
+            ;; We don't want the add-on path to be the profile store path,
+            ;; which would change too often.  We don't want the add-on path to
+            ;; be hard-coded either because it would never change (but it
+            ;; wouldn't make sense anyway).
+
+            (mkdir-p search-dir)
+            (symlink (in-vicinity (ungexp pkg pkg-output) addon-id)
+                     (in-vicinity search-dir addon-id))))))))