bruh

modules/nixos/hardware/raspberry-pi/generational/install-device-tree.sh

@@ -0,0 +1,75 @@
+#! @bash@/bin/sh -e
+
+# shellcheck disable=SC3030,SC3043,SC3044,SC3054
+
+shopt -s nullglob
+
+export PATH=/empty:@path@
+
+usage() {
+    echo "usage: $0 -c <path-to-configuration> [-d <destination-dir>] [-r]" >&2
+    exit 1
+}
+
+generationPath=         # Path to nixos configuration/generation
+target=/boot/firmware   # Device tree files target directory
+
+while getopts "c:d:r" opt; do
+    case "$opt" in
+        c) generationPath="$OPTARG" ;;
+        d) target="$OPTARG" ;;
+        r) useVendorDeviceTree=1 ;;
+        \?) usage ;;
+    esac
+done
+
+# Copy a file from the Nix store to $target.
+declare -A filesCopied
+
+copyForced() {
+    local src="$1"
+    local dst="$2"
+
+    local dstTmp="$dst.tmp.$$"
+
+    cp "$src" "$dstTmp"
+    mv "$dstTmp" "$dst"
+}
+
+echo "$0: $@"
+echo -n "installing device tree files: "
+
+# Device Tree
+
+if [ -n "$useVendorDeviceTree" ]; then
+    echo -n "vendor firmware "
+    dtb_path=@firmware@/share/raspberrypi/boot
+else
+    echo -n "generation's kernel's "
+    dtb_path=$(readlink -f "$generationPath/dtbs")
+fi
+echo "$dtb_path"
+
+# firmware package has dtbs in its root,
+# dtbs built with kernel are in broadcom/
+DTBS=("$dtb_path"/*.dtb "$dtb_path"/broadcom/*.dtb)
+for dtb in "${DTBS[@]}"; do
+    dst="$target/$(basename "$dtb")"
+    copyForced "$dtb" "$dst"
+    filesCopied[$dst]=1
+done
+
+SRC_OVERLAYS=("$dtb_path/overlays"/*)
+mkdir -p "$target/overlays"
+for ovr in "${SRC_OVERLAYS[@]}"; do
+    dst="$target/overlays/$(basename "$ovr")"
+    copyForced "$ovr" "$dst"
+    filesCopied[$dst]=1
+done
+
+# remove obsolete device tree files
+for fn in $target/*.dtb $target/overlays/*; do
+    if ! test "${filesCopied[$fn]}" = 1; then
+        rm -vf -- "$fn"
+    fi
+done