saving uncommitted changes in /etc prior to emerge run

paludis/hooks/auto_patch.bash

@@ -0,0 +1,70 @@
+#!/bin/bash
+#
+# Paludis hook script to apply patch (w/o modifying corresponding ebuild file).
+#
+# Copyright (c), 2010-2012 by Alex Turbov <i.zaufi@gmail.com>
+#
+# Version: @PH_VERSION@
+#
+
+source ${PALUDIS_EBUILD_DIR}/echo_functions.bash
+
+declare -r CONFIG_FILE="/etc/paludis/hooks/configs/auto_patch.conf"
+PATCH_DIR="/var/db/paludis/autopatches"
+# Configuration override
+[[ -f ${CONFIG_FILE} ]] && source ${CONFIG_FILE}
+
+PATCH_DIR_FULL="${PATCH_DIR}/${HOOK}/${CATEGORY}/${PF}"
+
+_ap_rememberfile="${T}/.autopatch_was_here_${PALUDIS_PID}"
+
+issue_a_warning()
+{
+    local -r tobe="$1"
+    ewarn "WARNING: ${CATEGORY}/${PF} package $tobe installed with additional patches applied by auto-patch hook."
+    ewarn "WARNING: Before filing a bug, remove all patches, reinstall, and try again..."
+}
+
+try_to_apply_patches()
+{
+    if [[ -n ${PALUDIS_HOOK_DEBUG} ]]; then
+        einfo "Check ${PATCH_DIR_FULL}"
+    fi
+    if [[ -d ${PATCH_DIR_FULL} ]] ; then
+        cd "${S}" || die "Failed to cd into ${S}!"
+        for i in "${PATCH_DIR_FULL}"/*.patch ; do
+            if declare -f epatch >/dev/null ; then
+                epatch ${i}
+            else
+                # sane default if no epatch is there
+                einfo "Applying ${i} ..."
+                patch -p1 -i "${i}" || die "Failed to apply ${i}!"
+            fi
+            touch "${_ap_rememberfile}" || die "Failed to touch ${_ap_rememberfile}!"
+        done
+        if [[ -e ${_ap_rememberfile} ]]; then
+            issue_a_warning "will be"
+        else
+            einfo "No patches in for this package."
+        fi
+    fi
+}
+
+case "${HOOK}" in
+    # ATTENTION This script must be symlinked to the following hook dirs:
+    ebuild_compile_post         | \
+    ebuild_compile_pre          | \
+    ebuild_configure_post       | \
+    ebuild_configure_pre        | \
+    ebuild_install_pre          | \
+    ebuild_unpack_post          )
+        try_to_apply_patches
+        ;;
+    install_all_post)
+        if [[ -e ${_ap_rememberfile} ]] ; then
+            issue_a_warning "was"
+        fi
+        ;;
+esac
+
+# kate: hl bash;

paludis/hooks/configs/auto_patch.conf

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+#
+# auto-patch.conf
+#
+
+# REMINDER: autopatch hook applies patches AFTER ebuild has done all
+# unpacking and patching.
+
+# Home directory for the patches.
+# Put the patches in ${PATCH_DIR}/cat/pkg-ver/ subdirectory
+# NOTE Uncomment the following line to override default location
+# PATCH_DIR="@PH_LOCALSTATEDIR@/paludis/autopatches"

paludis/hooks/ebuild_configure_pre/auto_patch.bash

@@ -0,0 +1 @@
+/etc/paludis/hooks/auto_patch.bash

paludis/hooks/ebuild_unpack_post/auto_patch.bash

@@ -0,0 +1 @@
+/etc/paludis/hooks/auto_patch.bash

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;