[bug#38546] [PATCH 02/11] gnu: julia: use SOURCE_DATE_EPOCH for precompilation timestamp

[nixo <anothersms@gmail.com>]

* gnu/packages/patches/julia-fake-mtime-with-SOURCE_DATE_EPOCH.patch: new file
---
 gnu/local.mk                                  |  1 +
 gnu/packages/julia.scm                        |  4 ++-
 ...ia-fake-mtime-with-SOURCE_DATE_EPOCH.patch | 29 +++++++++++++++++++
 3 files changed, 33 insertions(+), 1 deletion(-)
 create mode 100644 gnu/packages/patches/julia-fake-mtime-with-SOURCE_DATE_EPOCH.patch

diff --git a/gnu/local.mk b/gnu/local.mk
index 00ff3b8d61..fe8634b44d 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1010,6 +1010,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/java-xerces-bootclasspath.patch	\
   %D%/packages/patches/java-xerces-build_dont_unzip.patch	\
   %D%/packages/patches/java-xerces-xjavac_taskdef.patch	\
+  %D%/packages/patches/julia-SOURCE_DATE_EPOCH-mtime.patch      \
   %D%/packages/patches/jbig2dec-ignore-testtest.patch		\
   %D%/packages/patches/kdbusaddons-kinit-file-name.patch	\
   %D%/packages/patches/libvirt-create-machine-cgroup.patch	\
diff --git a/gnu/packages/julia.scm b/gnu/packages/julia.scm
index e4db39afbd..a66309b611 100644
--- a/gnu/packages/julia.scm
+++ b/gnu/packages/julia.scm
@@ -191,7 +191,9 @@
                     version "/julia-" version ".tar.gz"))
               (sha256
                (base32
-                "1nwkmr9j55g1zkxdchnid1h022s0is52vx23niksshgvh793g41x"))))
+                "1nwkmr9j55g1zkxdchnid1h022s0is52vx23niksshgvh793g41x"))
+              (patches
+               (search-patches "julia-fake-mtime-with-SOURCE_DATE_EPOCH.patch"))))
     (build-system gnu-build-system)
     (arguments
      `(#:test-target "test"
diff --git a/gnu/packages/patches/julia-fake-mtime-with-SOURCE_DATE_EPOCH.patch b/gnu/packages/patches/julia-fake-mtime-with-SOURCE_DATE_EPOCH.patch
new file mode 100644
index 0000000000..467e6d68d1
--- /dev/null
+++ b/gnu/packages/patches/julia-fake-mtime-with-SOURCE_DATE_EPOCH.patch
@@ -0,0 +1,29 @@
+From e4dc28db1d70819505fd1a68fd9d2bfc4fb61a7d Mon Sep 17 00:00:00 2001
+From: nixo <nicolo@nixo.xyz>
+Date: Fri, 17 Jan 2020 11:28:30 +0100
+Subject: [PATCH] base: loading: support fake mtime with SOURCE_DATE_EPCOCH
+
+Do this when loading libraries
+---
+ base/loading.jl | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/base/loading.jl b/base/loading.jl
+index 7f11a2d4fc..1b4686d1dc 100644
+--- a/base/loading.jl
++++ b/base/loading.jl
+@@ -807,7 +807,10 @@ function _include_dependency(mod::Module, _path::AbstractString)
+         path = normpath(joinpath(dirname(prev), _path))
+     end
+     if _track_dependencies[]
+-        push!(_require_dependencies, (mod, path, mtime(path)))
++        push!(_require_dependencies,
++              (mod, path,
++               haskey(ENV, "SOURCE_DATE_EPOCH") ?
++               parse(Float64, ENV["SOURCE_DATE_EPOCH"]) : mtime(path)))
+     end
+     return path, prev
+ end
+-- 
+2.24.1
+
-- 
2.24.1