From b05efae02df215c0dcb40c72d3ad1a2e3d9666a4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Johannes=20M=C3=BCller?= <straightshoota@gmail.com>
Date: Sun, 28 Apr 2024 21:38:55 +0200
Subject: [PATCH] Add `src/SOURCE_DATE_EPOCH` to release tree

---
 Makefile                    | 4 ++--
 Makefile.win                | 4 ++--
 scripts/release-update.sh   | 3 +++
 scripts/update-changelog.sh | 5 +++++
 4 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile
index 492b0aa762df..e56a14a27c1c 100644
--- a/Makefile
+++ b/Makefile
@@ -46,7 +46,8 @@ SPEC_FLAGS := $(if $(verbose),-v )$(if $(junit_output),--junit_output $(junit_ou
 CRYSTAL_CONFIG_LIBRARY_PATH := '$$ORIGIN/../lib/crystal'
 CRYSTAL_CONFIG_BUILD_COMMIT ?= $(shell git rev-parse --short HEAD 2> /dev/null)
 CRYSTAL_CONFIG_PATH := '$$ORIGIN/../share/crystal/src'
-SOURCE_DATE_EPOCH ?= $(shell (git show -s --format=%ct HEAD || stat -c "%Y" Makefile || stat -f "%m" Makefile) 2> /dev/null)
+CRYSTAL_VERSION ?= $(shell cat src/VERSION)
+SOURCE_DATE_EPOCH ?= $(shell (cat src/SOURCE_DATE_EPOCH || (git show -s --format=%ct HEAD || stat -c "%Y" Makefile || stat -f "%m" Makefile)) 2> /dev/null)
 ifeq ($(shell command -v ld.lld >/dev/null && uname -s),Linux)
   EXPORT_CC ?= CC="$(CC) -fuse-ld=lld"
 endif
@@ -63,7 +64,6 @@ LLVM_VERSION := $(if $(LLVM_CONFIG),$(shell $(LLVM_CONFIG) --version 2> /dev/nul
 LLVM_EXT_DIR = src/llvm/ext
 LLVM_EXT_OBJ = $(LLVM_EXT_DIR)/llvm_ext.o
 CXXFLAGS += $(if $(debug),-g -O0)
-CRYSTAL_VERSION ?= $(shell cat src/VERSION)
 
 DESTDIR ?=
 PREFIX ?= /usr/local
diff --git a/Makefile.win b/Makefile.win
index 034dce59e4dc..89c0f9972a14 100644
--- a/Makefile.win
+++ b/Makefile.win
@@ -63,7 +63,8 @@ SPEC_FLAGS := $(if $(verbose),-v )$(if $(junit_output),--junit_output $(junit_ou
 CRYSTAL_CONFIG_LIBRARY_PATH := $$ORIGIN\lib
 CRYSTAL_CONFIG_BUILD_COMMIT := $(shell git rev-parse --short HEAD)
 CRYSTAL_CONFIG_PATH := $$ORIGIN\src
-SOURCE_DATE_EPOCH := $(shell git show -s --format=%ct HEAD)
+CRYSTAL_VERSION ?= $(shell type src\VERSION)
+SOURCE_DATE_EPOCH ?= $(shell type src/SOURCE_DATE_EPOCH || git show -s --format=%ct HEAD)
 export_vars = $(eval export CRYSTAL_CONFIG_BUILD_COMMIT CRYSTAL_CONFIG_PATH SOURCE_DATE_EPOCH)
 export_build_vars = $(eval export CRYSTAL_CONFIG_LIBRARY_PATH)
 LLVM_CONFIG ?=
@@ -71,7 +72,6 @@ LLVM_VERSION := $(if $(LLVM_CONFIG),$(shell $(LLVM_CONFIG) --version))
 LLVM_EXT_DIR = src\llvm\ext
 LLVM_EXT_OBJ = $(LLVM_EXT_DIR)\llvm_ext.obj
 CXXFLAGS += $(if $(static),$(if $(debug),/MTd /Od ,/MT ),$(if $(debug),/MDd /Od ,/MD ))
-CRYSTAL_VERSION ?= $(shell type src\VERSION)
 
 prefix ?= $(or $(ProgramW6432),$(ProgramFiles))\crystal
 BINDIR ?= $(prefix)
diff --git a/scripts/release-update.sh b/scripts/release-update.sh
index d705ce357f3e..c9fa180f6578 100755
--- a/scripts/release-update.sh
+++ b/scripts/release-update.sh
@@ -16,6 +16,9 @@ minor_branch="${CRYSTAL_VERSION%.*}"
 next_minor="$((${minor_branch#*.} + 1))"
 echo "${CRYSTAL_VERSION%%.*}.${next_minor}.0-dev" > src/VERSION
 
+# Remove SOURCE_DATE_EPOCH (only used in source tree of a release)
+rm -f src/SOURCE_DATE_EPOCH
+
 # Edit PREVIOUS_CRYSTAL_BASE_URL in .circleci/config.yml
 sed -i -E "s|[0-9.]+/crystal-[0-9.]+-[0-9]|$CRYSTAL_VERSION/crystal-$CRYSTAL_VERSION-1|g" .circleci/config.yml
 
diff --git a/scripts/update-changelog.sh b/scripts/update-changelog.sh
index 3d044eb79062..6fe0fa2839f3 100755
--- a/scripts/update-changelog.sh
+++ b/scripts/update-changelog.sh
@@ -44,6 +44,11 @@ git switch $branch 2>/dev/null || git switch -c $branch;
 echo "${VERSION}" > src/VERSION
 git add src/VERSION
 
+# Write release date into src/SOURCE_DATE_EPOCH
+release_date=$(head -n1 $current_changelog | grep -o -P '(?<=\()[^)]+')
+echo "$(date --utc --date="${release_date}" +%s)" > src/SOURCE_DATE_EPOCH
+git add src/SOURCE_DATE_EPOCH
+
 if grep --silent -E "^## \[$VERSION\]" CHANGELOG.md; then
   echo "Replacing section in CHANGELOG"