Make TimeZones.jl relocatable

Project.toml

@@ -4,6 +4,7 @@ authors = ["Curtis Vogt <curtis.vogt@gmail.com>"]
 version = "1.19.0"
 
 [deps]
+Artifacts = "56f22d72-fd6d-98f1-02f0-08ddc0907c33"
 Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
 Downloads = "f43a241f-c20a-4ad4-852c-f6b1247861c6"
 InlineStrings = "842dd82b-1e85-43dc-bf29-5d0ee9dffc48"
@@ -22,6 +23,7 @@ RecipesBase = "3cdcf5f2-1ef4-517c-9805-6587b60abb01"
 TimeZonesRecipesBaseExt = "RecipesBase"
 
 [compat]
+Artifacts = "1"
 Aqua = "0.8"
 Dates = "1"
 Downloads = "1"

src/TimeZones.jl

@@ -1,5 +1,6 @@
 module TimeZones
 
+using Artifacts
 using Dates
 using Printf
 using Scratch: @get_scratch!
@@ -33,13 +34,33 @@
 
 _scratch_dir() = @get_scratch!("build")
 
-const _COMPILED_DIR = Ref{String}(TZJData.ARTIFACT_DIR)
+const _COMPILED_DIR = Ref{String}()
 
 # TimeZone types used to disambiguate the context of a DateTime
 # abstract type UTC <: TimeZone end  # Already defined in the Dates stdlib
 abstract type Local <: TimeZone end
 
 function __init__()
+    # Must be set at runtime to ensure relocatability 
+    _COMPILED_DIR[] = if isdefined(TZJData, :artifact_dir)
+        # Recent versions of TZJData are relocatable
+        TZJData.artifact_dir()
+    else
+        # Backwards compatibility with TZJData v1.3.0 and below
+        hash = if TZJData.TZDATA_VERSION == "2024b"
+            Base.SHA1("7fdea2a12522469ca39925546d1fd93c10748180")
+        elseif TZJData.TZDATA_VERSION == "2024a"
+            Base.SHA1("520ce3f83be7fbb002cca87993a1b1f71fe10912")
+        elseif TZJData.TZDATA_VERSION == "2023d"
+            Base.SHA1("b071cffdb310f5d3ca640c09cfa3dc3f23d450ad")
+        elseif TZJData.TZDATA_VERSION == "2023c"
+            Base.SHA1("52e48e96c4df04eeebc6ece0d9f1c3b545f0544c")
+        else
+            error("TZJData.jl with TZDATA_VERSION = $(TZJData.TZDATA_VERSION) is supposed to be relocatable!")
+        end
+        Artifacts.artifact_path(hash)
+    end
+
     # Dates extension needs to happen everytime the module is loaded (issue #24)
     init_dates_extension()