saving uncommitted changes in /etc prior to emerge run

paludis/hooks/setup_pkg_env.bash

@@ -0,0 +1,66 @@
+#!/bin/bash
+#
+# Helper functions to use from /etc/paludis/bashrc and
+# package environment control files.
+#
+# Copyright 2014 by Alex Turbov <i.zaufi@gmail.com>
+#
+
+source ${PALUDIS_EBUILD_DIR}/echo_functions.bash
+
+#
+# Add options to the end of a given var
+# $1 - variable to modify
+# $2..$n - options to add
+#
+add-options()
+{
+    local var=$1
+    shift
+    local stmt="$var=\"\$${var} $*\""
+    eval "$stmt"
+}
+
+#
+# Remove options from a given var
+# $1 - variable to modify
+# $2..$n - options to remove
+#
+remove-options()
+{
+    local -r _ro_var="$1"
+    shift
+    local -a _ro_new_value
+    local _ro_opt
+    local _ro_del_value
+
+    # Iterate over options in a variable
+    for _ro_opt in ${!_ro_var}; do
+        # Iterate over options to remove passed as function parameters
+        for _ro_del_value in "$@"; do
+            [[ ${_ro_opt} == ${_ro_del_value} ]] && continue 2
+        done
+        _ro_new_value+=( "${_ro_opt}" )
+    done
+    eval "${_ro_var}=\"${_ro_new_value[@]}\""
+}
+
+setup_pkg_env()
+{
+	local conf
+    [[ ! -f /etc/paludis/package_env.conf ]] && return
+    # Select configured environments
+	local envs=$(for i in `egrep "^${CATEGORY}/(${PN}|\*)(:[^\s]+)?\s" /etc/paludis/package_env.conf | sed 's,[^ ]\+\s,,'`; do echo "${i}"; done | sort -u)
+    for conf in $envs; do
+        if [[ -f /etc/paludis/env.conf.d/${conf}.conf ]]; then
+            source /etc/paludis/env.conf.d/${conf}.conf
+        else
+            ewarn "Ignore undefined environment configuration: ${conf}"
+        fi
+    done
+}
+
+# Do it!
+setup_pkg_env
+
+# kate: hl bash;