build: add date-based release versioning script and remove hardcoded version

scripts/apply-bananarchy-overlay.sh

@@ -42,6 +42,9 @@ esac
 echo "[1/4] Installing Bananarchy rootfs overlay (artwork, branding, Sxmo 240x320, UCM, udev)..."
 rm -f "$TARGET_ROOTFS/usr/bin/bantam" "$TARGET_ROOTFS/usr/local/bin/bantam" "$TARGET_ROOTFS/etc/doas.d/wheel.conf"
 cp -af "$BASE_DIR/overlay/rootfs/." "$TARGET_ROOTFS/"
+if [ -x "$BASE_DIR/scripts/version.sh" ]; then
+  "$BASE_DIR/scripts/version.sh" "$TARGET_ROOTFS"
+fi
 chown -R 10000:10000 "$TARGET_ROOTFS/home/user" 2>/dev/null || true
 chown 0:0 "$TARGET_ROOTFS/etc/doas.d/50-sxmo.conf" 2>/dev/null || true
 chmod 640 "$TARGET_ROOTFS/etc/doas.d/50-sxmo.conf" 2>/dev/null || true

scripts/version.sh

@@ -0,0 +1,46 @@
+#!/bin/sh
+# Compute and apply the Bananarchy Linux release version:
+#   <year-letter><MM><DD>
+# where <year-letter> is 'a'..'z' for (year - 2026) mod 26 (2026 = 'a'),
+# followed by the two-digit local month and two-digit local day.
+set -eu
+
+BASE_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+
+YEAR="$(date +%Y)"
+MONTH="$(date +%m)"
+DAY="$(date +%d)"
+
+LETTER_IDX=$(( ((YEAR - 2026) % 26 + 26) % 26 ))
+YEAR_LETTER="$(printf "\\$(printf '%03o' $(( 97 + LETTER_IDX )))")"
+VERSION="${BANANARCHY_VERSION:-${YEAR_LETTER}${MONTH}${DAY}}"
+
+if [ "${1:-}" = "--print" ] || [ "${1:-}" = "-p" ]; then
+  printf '%s\n' "$VERSION"
+  exit 0
+fi
+
+TARGET_ROOTFS="${1:-${ROOTFS_DIR:-$BASE_DIR/rootfs}}"
+
+apply_template() {
+  src_tpl="$1"
+  dst_file="$2"
+  if [ -f "$src_tpl" ]; then
+    mkdir -p "$(dirname "$dst_file")"
+    sed "s/@BANANARCHY_VERSION@/$VERSION/g" "$src_tpl" > "$dst_file"
+  elif [ -f "$dst_file" ]; then
+    sed -i -E \
+      -e "s/@BANANARCHY_VERSION@/$VERSION/g" \
+      -e "s/v0\.0\.1/$VERSION/g" \
+      "$dst_file"
+  fi
+}
+
+if [ -d "$TARGET_ROOTFS" ]; then
+  for rel in etc/os-release etc/issue etc/motd; do
+    apply_template "$BASE_DIR/overlay/rootfs/$rel" "$TARGET_ROOTFS/$rel"
+  done
+  echo "Applied Bananarchy version $VERSION to $TARGET_ROOTFS"
+else
+  printf '%s\n' "$VERSION"
+fi