bug#32026: [PATCH 05/10] gnu: icecat: Add a patch that makes building language packs reproducible.

[Maxim Cournoyer]

* gnu/packages/patches/icecat-reproducible-langpacks.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register. it.
* gnu/packages/gnuzilla.scm (icecat-source): Apply it.
---

 gnu/local.mk                                  |  1 +
 gnu/packages/gnuzilla.scm                     |  1 +
 .../icecat-reproducible-langpacks.patch       | 43 +++++++++++++++++++
 3 files changed, 45 insertions(+)
 create mode 100644 gnu/packages/patches/icecat-reproducible-langpacks.patch

diff --git a/gnu/local.mk b/gnu/local.mk
index cdb99813d0..96787661ac 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1327,6 +1327,7 @@ dist_patch_DATA =                                         
\
   %D%/packages/patches/i7z-gcc-10.patch                                \
   %D%/packages/patches/icecat-makeicecat.patch                 \
   %D%/packages/patches/icecat-avoid-bundled-libraries.patch    \
+  %D%/packages/patches/icecat-reproducible-langpacks.patch     \
   %D%/packages/patches/icecat-use-system-graphite2+harfbuzz.patch      \
   %D%/packages/patches/icecat-use-system-media-libs.patch      \
   %D%/packages/patches/icedtea-7-hotspot-aarch64-use-c++98.patch\
diff --git a/gnu/packages/gnuzilla.scm b/gnu/packages/gnuzilla.scm
index 28cb16554d..db7ca5ceb2 100644
--- a/gnu/packages/gnuzilla.scm
+++ b/gnu/packages/gnuzilla.scm
@@ -554,6 +554,7 @@ (define icecat-source
       (method computed-origin-method)
       (file-name (string-append "icecat-" %icecat-version ".tar.xz"))
       (sha256 #f)
+      (patches (search-patches "icecat-reproducible-langpacks.patch"))
       (uri
        (delay
         (with-imported-modules '((guix build utils))
diff --git a/gnu/packages/patches/icecat-reproducible-langpacks.patch 
b/gnu/packages/patches/icecat-reproducible-langpacks.patch
new file mode 100644
index 0000000000..376345d085
--- /dev/null
+++ b/gnu/packages/patches/icecat-reproducible-langpacks.patch
@@ -0,0 +1,43 @@
+Prevent the extension manifests from embedding the current date.
+
+This is inspired by the Debian
+"Use-build-id-as-langpack-version-for-reproducibility.patch" maintained for
+their Firefox package as well as reproducible-builds.org guidelines from
+https://reproducible-builds.org/docs/source-date-epoch/.
+
+--- ./python/mozbuild/mozbuild/action/langpack_manifest.py.old 2023-02-13 
11:01:21.051537347 -0500
++++ ./python/mozbuild/mozbuild/action/langpack_manifest.py     2023-02-13 
11:04:33.141817330 -0500
+@@ -36,6 +36,15 @@
+ pushlog_api_url = "{0}/json-rev/{1}"
+ 
+ 
++import os
++import time
++import datetime
++
++def get_build_date():
++    """Honor SOURCE_DATE_EPOCH for reproducibility."""
++    return datetime.datetime.utcfromtimestamp(
++        int(os.environ.get('SOURCE_DATE_EPOCH', time.time())))
++
+ ###
+ # Retrievers a UTC datetime of the push for the current commit
+ # from a mercurial clone directory.
+@@ -54,7 +63,7 @@
+     with mozversioncontrol.get_repository_object(path=path) as repo:
+         phase = repo._run("log", "-r", ".", "-T" "{phase}")
+         if phase.strip() != "public":
+-            return datetime.datetime.utcnow()
++            return get_build_date()
+         repo_url = repo._run("paths", "default")
+         repo_url = repo_url.strip().replace("ssh://", "https://";)
+         repo_url = repo_url.replace("hg://", "https://";)
+@@ -105,7 +114,7 @@
+         dt = get_dt_from_hg(path)
+ 
+     if dt is None:
+-        dt = datetime.datetime.utcnow()
++        dt = get_build_date()
+ 
+     dt = dt.replace(microsecond=0)
+     return dt.strftime("%Y%m%d%H%M%S")
-- 
2.39.1