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ENT-14061: Set SOURCE_DATE_EPOCH from core's HEAD commit timestamp #2271

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ENT-14061: Set SOURCE_DATE_EPOCH from core's HEAD commit timestamp #2271

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20d9a56
functions: Set SOURCE_DATE_EPOCH from core's HEAD commit timestamp
larsewi May 27, 2026
ebd4097
functions: Persist SOURCE_DATE_EPOCH for downstream jobs
larsewi Jun 1, 2026
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18 changes: 18 additions & 0 deletions build-scripts/functions
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Original file line number Diff line number Diff line change
Expand Up @@ -796,4 +796,22 @@ log_error() {
echo "$(basename "$0"): error:" "$@" >&2
}

# Pin embedded build timestamps so two builds of the same source produce identical binaries.
# In bootstrap-pr we derive it from core's HEAD commit time and persist it into
# output/ so downstream jobs (which consume the bootstrap artifacts but no
# longer have core/.git) can recover the same value.
if [ -z "$SOURCE_DATE_EPOCH" ]; then
if [ -d "$BASEDIR/core/.git" ]; then
SOURCE_DATE_EPOCH=$(git -C "$BASEDIR/core" log -1 --format=%ct)
mkdir -p "$BASEDIR/output"
echo "$SOURCE_DATE_EPOCH" > "$BASEDIR/output/SOURCE_DATE_EPOCH"
elif [ -f "$BASEDIR/output/SOURCE_DATE_EPOCH" ]; then
SOURCE_DATE_EPOCH=$(cat "$BASEDIR/output/SOURCE_DATE_EPOCH")
fi
if [ -n "$SOURCE_DATE_EPOCH" ]; then
export SOURCE_DATE_EPOCH
log_info "SOURCE_DATE_EPOCH=$SOURCE_DATE_EPOCH"
fi
fi

_IS_FUNCTIONS_SOURCED=yes
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