deepin: add setup hook with helper functions

pkgs/desktops/deepin/default.nix

@@ -2,6 +2,8 @@
 
 let
   packages = self: with self; {
+    setupHook = ./setup-hook.sh;
+
     updateScript = callPackage ./update.nix { };
 
     dbus-factory = callPackage ./dbus-factory { };

pkgs/desktops/deepin/setup-hook.sh

@@ -0,0 +1,53 @@
+# Helper functions for deepin packaging
+
+searchHardCodedPaths() {
+    # looks for ocurrences of hard coded paths in given (current)
+    # directory and command invocations for the purpose of debugging a
+    # derivation
+
+    local dir=$1
+
+    echo ----------- looking for command invocations
+    grep --color=always -r -E '\<(ExecStart|Exec|startDetached|execute|exec\.(Command|LookPath))\>' $dir || true
+
+    echo ----------- looking for hard coded paths
+    grep --color=always -r -E '/(usr|bin|sbin|etc|var|opt)\>' $dir || true
+
+    echo ----------- done
+}
+
+fixPath() {
+    # Usage:
+    #
+    #   fixPath <parent dir> <path> <files>
+    #
+    # replaces occurences of <path> by <parent_dir><path> in <files>
+    # removing /usr from the start of <path> if present
+
+    local parentdir=$1
+    local path=$2
+    local newpath=$parentdir$(echo $path | sed "s,^/usr,,")
+    local files=("${@:3}")
+    echo ======= grep --color=always "${path}" "${files[@]}"
+    grep --color=always "${path}" "${files[@]}"
+    echo +++++++ sed -i -e "s,$path,$newpath,g" "${files[@]}"
+    sed -i -e "s,$path,$newpath,g" "${files[@]}"
+}
+
+searchForUnresolvedDLL() {
+    # Usage:
+    #
+    #   searchForUnresolvedDLL <dir>
+    #
+    # looks in <dir> for executables with unresolved dynamic library paths
+
+    local dir="$1"
+    echo ======= Looking for executables with unresolved dynamic library dependencies
+    echo $dir
+    for f in $(find -L "$dir" -type f -executable); do
+      if (ldd $f | grep -q "not found"); then
+        echo $f
+        ldd $f | grep --color=always "not found"
+      fi
+    done
+}